Catalytic cracking auxiliary agent and preparation method and application thereof
阅读说明：本技术 一种催化裂化助剂及其制备方法和应用 (Catalytic cracking auxiliary agent and preparation method and application thereof ) 是由 于善青 严加松 张杰潇 林伟 李家兴 于 2020-06-17 设计创作，主要内容包括：本公开涉及一种催化裂化助剂及其制备方法和应用,以催化裂化助剂的总重量为基准,该催化裂化助剂含有10-50重量％的改性β沸石、20-85重量％的粘土和5-35重量％的改性粘结剂；改性β沸石含有0.1-1％重量％的CuO和1-15％重量％的P-(2)O-(5),改性β沸石的微反活性指数为58以上；改性粘结剂含有80-95重量％的Al-(2)O-(3)和5-20重量％的B-(2)O-(3),B与Al的摩尔比为0.05-0.5,改性粘结剂的pH值为1.0-3.5。该催化裂化助剂可以显著提高碳四烯烃的收率和液化气中碳四烯烃的浓度。(The present disclosure relates to a catalytic cracking assistant, a preparation method and an application thereof, wherein the catalytic cracking assistant comprises 10-50 wt% of modified beta zeolite, 20-85 wt% of clay and 5-35 wt% of modified binder, wherein the total weight of the catalytic cracking assistant is used as a reference; the modified beta zeolite contains 0.1-1 wt% of CuO and 1-15 wt% of P 2 O 5 The micro-inverse activity index of the modified beta zeolite is more than 58; the modified binder contains 80-95 wt.% of Al 2 O 3 And 5-20% by weight of B 2 O 3 The molar ratio of B to Al is 0.05-0.5, and the pH value of the modified binder is 1.0-3.5. The catalytic cracking assistant can obviously improve the yield of the carbon tetraolefin and the concentration of the carbon tetraolefin in liquefied gas.)
1. The catalytic cracking assistant comprises, based on the total weight of the catalytic cracking assistant, 10-50 wt% of modified beta zeolite, 20-85 wt% of clay and 5-35 wt% of modified binder;
the modified beta zeolite contains 0.1-1 wt% of CuO and 1-15 wt% of P2O5The micro-inverse activity index of the modified beta zeolite is above 58;
the modified binder contains 80-95 wt% of Al2O3And 5-20% by weight of B2O3The molar ratio of B to Al is 0.05-0.5, and the pH value of the modified binder is 1.0-3.5.
2. The catalytic cracking promoter according to claim 1, wherein the catalytic cracking promoter comprises 20 to 50 wt% of the modified beta zeolite, 20 to 70 wt% of the clay, and 10 to 35 wt% of the modified binder.
3. The catalytic cracking promoter of claim 1, wherein the modified beta zeolite comprises 0.2 to 0.8 wt% CuO and 3 to 12 wt% P2O5The micro-inverse activity index of the modified beta zeolite is 60-70.
4. The catalytic cracking aid of claim 1, wherein the modified binder comprises 80-90 wt% Al2O3And 10-20% by weight of B2O3B andthe mol ratio of Al is 0.1-0.4, and the pH value of the modified binder is 1.5-3.0.
5. The catalytic cracking aid of claim 1, wherein the catalytic cracking aid has a specific surface area of 150-300m2The volume of water drop pore is 0.3-0.45mL/g, the abrasion index is 0.5-3.0%, and the micro-inverse activity index is 35-60.
6. The catalytic cracking aid of claim 1, wherein the clay is selected from one or more of kaolin, rectorite, diatomite, montmorillonite, bentonite and sepiolite.
7. A process for preparing the catalytic cracking aid of any one of claims 1 to 6, comprising:
(1) mixing beta zeolite, a phosphorus source, a copper source and a first solvent, and adjusting the pH value of the mixture to 1.0-6.0 to obtain slurry containing modified beta zeolite;
(2) mixing and stirring an aluminum source, a boron source, an inorganic acid and a second solvent to obtain a modified binder;
(3) mixing the modified binder, the slurry containing the modified beta zeolite, clay and a third solvent, and drying and roasting the obtained mixture.
8. The method according to claim 7, wherein, in the step (1), the temperature of the mixing is 10-90 ℃;
the weight ratio of the beta zeolite to the phosphorus source to the copper source to the first solvent is 1: (0.05-0.16): (0.001-0.01): (1-5), the phosphorus source is P2O5The copper source is calculated as CuO;
preferably, the weight ratio of the beta zeolite, the phosphorus source, the copper source and the first solvent is 1: (0.05-0.1): (0.005-0.01): (1.5-3.5).
9. The method of claim 7, wherein step (2) comprises: and mixing the aluminum source, the boron source and the second solvent, stirring for 0.5-5 hours at 10-90 ℃, adding the inorganic acid, and continuously stirring for 0.5-5 hours.
10. The method of claim 7, wherein in step (2), the concentration of the hydrochloric acid is 10-36 wt%; the weight ratio of the aluminum source to the hydrochloric acid is 1: (0.1-0.3), the aluminum source is Al2O3And (6) counting.
11. The method of claim 7, wherein the drying is at a temperature of 60-200 ℃ for 1-24 hours; the roasting temperature is 300-650 ℃, and the roasting time is 1-5 hours.
12. The method of claim 7, wherein the phosphorus source is selected from one or more of orthophosphoric acid, phosphorous acid, ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, aluminum phosphate, and pyrophosphoric acid;
the copper source is selected from one or more of copper sulfate, copper chloride, copper nitrate, copper carbonate and copper acetate;
the aluminum source is selected from one or more of pseudo-boehmite, alumina, aluminum hydroxide and boehmite;
the beta zeolite is selected from one or more of hydrogen type beta zeolite, sodium type beta zeolite and rare earth modified beta zeolite;
the clay is selected from one or more of kaolin, rectorite, diatomite, montmorillonite, bentonite and sepiolite;
the boron source is selected from one or more of boric acid, aluminum borate and boron trifluoride;
the inorganic acid is selected from one or more of hydrochloric acid, sulfuric acid, nitric acid, acetic acid, citric acid and oxalic acid;
the first solvent, the second solvent and the third solvent are respectively and independently selected from one or more of deionized water, distilled water, deoxidized ionized water and ethanol.
13. Use of the catalytic cracking assistant according to any one of claims 1 to 6 for catalytic cracking of a raw oil.
14. The use according to claim 13, wherein the catalytic cracking aid is used in an amount of 1-50 wt% based on the total amount of the catalytic cracking aid and the catalytic cracking catalyst.
Technical Field
A catalytic cracking auxiliary agent, a preparation method and application thereof.
Background
Along with the enhancement of environmental awareness, the quality standard of the gasoline for the automobile is continuously upgraded and updated. The new standard of motor gasoline and GB17930-2016 clearly stipulate that the national VI standard gasoline is implemented in stages in 2019, compared with the national V standard, the benzene, arene and olefin contents of the gasoline under the national VI standard are reduced, and the current national gasoline blending component scheme is difficult to meet the requirements. Because the alkylated gasoline has high octane number and zero contents of olefin, aromatic hydrocarbon and benzene, the alkylated gasoline is a good gasoline blending component under the national VI standard compared with the traditional catalytic gasoline and reformed gasoline, and the proportion of the alkylated gasoline in the gasoline blending component can be greatly improved. The main feeds to the alkylation unit are isobutane and butenes. Nearly 70% of the worldwide butenes are from catalytic crackers, and the technology for producing butene fractions from catalytic crackers has the advantages of low investment and low cost, and many companies try to obtain a greater yield of butenes from the catalytic cracking process.
In order to increase the yield of the light olefins, shape-selective molecular sieves are usually added into the catalyst. U.S. Engelhard corporation, 1993, first discloses a cracking catalyst for increasing the yield of isobutene and isopentene in U.S. Pat. No. 5,5243121, wherein the unit cell size of Y zeolite in the cracking catalyst is reduced through hydrothermal treatment, so that the selectivity of the catalyst to olefin in a product during hydrocarbon cracking can be improved, and a considerable amount of ZSM-5 zeolite can be added into the catalyst as an auxiliary agent, so that the coke formation amount can be reduced, and the activity can be improved. US3758403 discloses a catalyst using ZSM-5 and large pore zeolite (mainly Y-type zeolite) as active components, which increases the octane number of gasoline and increases the yield of C3 and C4 olefins, wherein the large pore zeolite cracks the raw material to produce gasoline and diesel oil, and the ZSM-5 shape selective molecular sieve further cracks the raw material to produce lower olefins.
Due to the structural particularity of beta zeolite, the beta zeolite has both acid catalytic property and structural selectivity, and has been rapidly developed into a novel catalytic material in recent years. There are also many reports of the application of beta zeolite to catalytic cracking catalysts for the production of lower olefins. US4837396 discloses a catalyst comprising a beta zeolite and a Y zeolite, and a metal ion-containing compound as a stabilizer to improve the hydrothermal stability and mechanical strength of the catalyst. The stabilizer can directly act with beta zeolite, and can also be introduced in the preparation process. CN1055105C discloses a cracking catalyst for producing more isobutene and isoamylene, which contains 6-30 wt% of phosphorus and rare earth five-membered ring high-silicon zeolite, 5-20 wt% of USY zeolite, 1-5 wt% of beta zeolite, 30-60 wt% of clay and 15-30 wt% of inorganic oxide. CN104998681A discloses a catalytic cracking assistant for increasing the concentration of low-carbon olefin and a preparation method thereof, wherein the assistant comprises boron modified beta molecular sieve containing phosphorus and metal, inorganic oxide binder, VIII family metal additive, phosphorus additive and optional clay. The catalytic cracking assistant is applied to catalytic cracking of petroleum hydrocarbon, can increase the concentration of isobutene in catalytic cracking liquefied gas, and reduces the yield of coke.
When the various catalysts/auxiliaries prepared by the prior art are used in the catalytic cracking process, the purpose of increasing the carbon four-olefin is achieved to a certain extent, but the main problems are as follows: the yield of the carbon tetraolefin is increased, and simultaneously, the yield of the liquefied gas is also increased, so that the concentration of the carbon tetraolefin in the liquefied gas is not changed greatly, and the selectivity of the carbon tetraolefin is poor.
Disclosure of Invention
The purpose of the present disclosure is to provide a catalytic cracking aid, a preparation method and an application thereof, wherein the catalytic cracking aid can significantly improve the yield of carbon tetraolefins and the concentration of carbon tetraolefins in liquefied gas.
In order to achieve the above object, the first aspect of the present disclosure provides a catalytic cracking assistant comprising 10 to 50 wt% of modified beta zeolite, 20 to 85 wt% of clay, and 5 to 35 wt% of a modified binder, based on the total weight of the catalytic cracking assistant;
the modified beta zeolite contains 0.1-1 wt% of CuO and 1-15 wt% of P2O5The micro-inverse activity index of the modified beta zeolite is above 58;
the modified binder contains 80-95 wt%Al2O3And 5-20% by weight of B2O3The molar ratio of B to Al is 0.05-0.5, and the pH value of the modified binder is 1.0-3.5.
Optionally, the catalytic cracking aid comprises 20-50 wt% of modified beta zeolite, 20-70 wt% of clay and 10-35 wt% of modified binder.
Optionally, the modified beta zeolite contains 0.2 to 0.8 wt% CuO and 3 to 12 wt% P2O5The micro-inverse activity index of the modified beta zeolite is 60-70.
Optionally, the modified binder contains 80-90 wt.% Al2O3And 10-20% by weight of B2O3The molar ratio of B to Al is 0.1-0.4, and the pH value of the modified binder is 1.5-3.0.
Optionally, the specific surface area of the catalytic cracking assistant is 150-300m2The volume of water drop pore is 0.3-0.45mL/g, the abrasion index is 0.5-3.0%, and the micro-inverse activity index is 35-60.
Optionally, the clay is selected from one or more of kaolin, rectorite, diatomite, montmorillonite, bentonite and sepiolite.
In a second aspect, the present invention provides a process for preparing a catalytic cracking aid provided in the first aspect of the present invention, the process comprising:
(1) mixing beta zeolite, a phosphorus source, a copper source and a first solvent, and adjusting the pH value of the mixture to 1.0-6.0 to obtain slurry containing modified beta zeolite;
(2) mixing and stirring an aluminum source, a boron source, an inorganic acid and a second solvent to obtain a modified binder;
(3) mixing the modified binder, the slurry containing the modified beta zeolite, clay and a third solvent, and drying and roasting the obtained mixture.
Optionally, in step (1), the temperature of the mixing is 10-90 ℃;
the weight ratio of the beta zeolite to the phosphorus source to the copper source to the first solvent is 1: (0.05-0.16): (0.001-0.01): (1-5), the phosphorus source is P2O5The copper source is calculated as CuO;
preferably, the weight ratio of the beta zeolite, the phosphorus source, the copper source and the first solvent is 1: (0.05-0.1): (0.005-0.01): (1.5-3.5).
Optionally, step (2) comprises: and mixing the aluminum source, the boron source and the second solvent, stirring for 0.5-5 hours at 10-90 ℃, adding the inorganic acid, and continuously stirring for 0.5-5 hours.
Optionally, in the step (2), the concentration of the hydrochloric acid is 10-36 wt%; the weight ratio of the aluminum source to the hydrochloric acid is 1: (0.1-0.3), the aluminum source is Al2O3And (6) counting.
Optionally, the drying temperature is 60-200 ℃ and the drying time is 1-24 hours; the roasting temperature is 300-650 ℃, and the roasting time is 1-5 hours.
Optionally, the phosphorus source is selected from one or more of orthophosphoric acid, phosphorous acid, ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, aluminum phosphate and pyrophosphoric acid;
the copper source is selected from one or more of copper sulfate, copper chloride, copper nitrate, copper carbonate and copper acetate;
the aluminum source is selected from one or more of pseudo-boehmite, alumina, aluminum hydroxide and boehmite;
the beta zeolite is selected from one or more of hydrogen type beta zeolite, sodium type beta zeolite and rare earth modified beta zeolite;
the clay is selected from one or more of kaolin, rectorite, diatomite, montmorillonite, bentonite and sepiolite;
the boron source is selected from one or more of boric acid, aluminum borate and boron trifluoride;
the inorganic acid is selected from one or more of hydrochloric acid, sulfuric acid, nitric acid, acetic acid, citric acid and oxalic acid;
the first solvent, the second solvent and the third solvent are respectively and independently selected from one or more of deionized water, distilled water, deoxidized ionized water and ethanol.
The third aspect of the invention provides an application of the catalytic cracking assistant provided by the first aspect of the invention in catalytic cracking of raw oil.
Optionally, the amount of the catalytic cracking aid is 1-50 wt% based on the total amount of the catalytic cracking aid and the catalytic cracking catalyst.
Through the technical scheme, the catalytic cracking auxiliary agent has higher reaction activity and selectivity of the carbon tetraolefin, and when the catalytic cracking auxiliary agent is used in the catalytic cracking process of raw oil, the yield of the carbon tetraolefin and the concentration of the carbon tetraolefin in liquefied gas can be improved, and the yield of diesel oil is reduced.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The invention provides a catalytic cracking auxiliary agent, which comprises 10-50 wt% of modified beta zeolite, 20-85 wt% of clay and 5-35 wt% of modified binder, based on the total weight of the catalytic cracking auxiliary agent; the modified beta zeolite contains 0.1-1 wt% of CuO and 1-15 wt% of P2O5The micro-inverse activity index of the modified beta zeolite is more than 58; the modified binder contains 80-95 wt.% of Al2O3And 5-20% by weight of B2O3The molar ratio of B to Al is 0.05-0.5, and the pH value of the modified binder is 1.0-3.5.
Wherein, the micro-inverse activity index of the modified beta zeolite refers to the micro-inverse activity of the modified beta zeolite measured after aging for 17 hours at 800 ℃ by 100 percent of water vapor. The catalytic cracking assistant contains beta zeolite compositely modified by phosphorus and copper, has higher specific surface area, better catalytic activity and selectivity to carbon tetraolefin, can obviously improve the yield of the carbon tetraolefin and the concentration of the carbon tetraolefin in liquefied gas and reduce the yield of diesel when being used in the raw oil catalytic cracking process.
In one embodiment, the catalytic cracking aid comprises 20-50 wt% of the modified beta zeolite, 20-70 wt% of the clay, and 10-35 wt% of the modified binder. Preferably, the catalytic cracking aid comprises 20-45 wt% of modified beta zeolite, 20-65 wt% of clay and 10-30 wt% of modified binder.
According to the present invention, the modified beta zeolite may contain 0.2 to 0.8% by weight of CuO and 3 to 12% by weight of P2O5The micro-inverse activity index of the modified beta zeolite is 60-70. Preferably, the modified beta zeolite may contain 0.2 to 0.7 wt% of CuO and 3 to 10 wt% of P2O5The micro-inverse activity index of the modified beta zeolite is 60-68.
According to the invention, the modified binder may contain 80 to 90 wt.% of Al2O3And 10-20% by weight of B2O3The molar ratio of B to Al may be 0.1 to 0.4, and the pH of the modified binder may be 1.5 to 3.0. Preferably, the modified binder may contain 80-88 wt% of Al2O3And 10-18% by weight of B2O3The molar ratio of B to Al may be 0.15 to 0.35, and the pH of the modified binder may be 1.8 to 3.0.
According to the present invention, the specific surface area of the catalytic cracking aid may be 150-300m2The pore volume of the water drop can be 0.30-0.45mL/g, the abrasion index can be 0.5-3.0, and the microreflective index can be 35-60.
According to the invention, clays are well known to those skilled in the art and may be selected, for example, from one or more of kaolin, rectorite, diatomaceous earth, montmorillonite, bentonite and sepiolite.
In a second aspect, the present invention provides a process for preparing a catalytic cracking aid provided in the first aspect of the present invention, the process comprising:
(1) mixing beta zeolite, a phosphorus source, a copper source and a first solvent, and adjusting the pH value of the mixture to 1.0-6.0 to obtain slurry containing modified beta zeolite;
(2) mixing and stirring an aluminum source, a boron source, an inorganic acid and a second solvent to obtain a modified binder;
(3) mixing the modified binder, the slurry containing the modified beta zeolite, the clay and a third solvent, and drying and roasting the obtained mixture.
The method can prepare the catalytic cracking assistant with higher catalytic activity and carbon tetraolefin selectivity.
In one embodiment, in step S1, after the beta zeolite, the phosphorus source, the copper source, and the first solvent are mixed, and the pH of the mixture is adjusted to 1.0 to 6.0, the resulting mixture is mixed at 10 to 90 ℃ for 1 to 48 hours, preferably 15 to 60 ℃ for 1 to 12 hours, and more preferably 40 to 60 ℃ for 2 to 6 hours.
According to the invention, the weight ratio of the amounts of zeolite beta, phosphorus source, copper source and first solvent can vary within wide limits and can be, for example, 1: (0.05-0.16): (0.001-0.01): (1-5), preferably 1: (0.05-0.1): (0.005-0.01): (1.5-3.5) phosphorus source is P2O5The copper source is calculated as CuO. Wherein the phosphorus source can be one or more selected from orthophosphoric acid, phosphorous acid, ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, aluminum phosphate and pyrophosphoric acid; the copper source can be one or more selected from copper sulfate, copper chloride, copper nitrate, copper carbonate and copper acetate; the beta zeolite can be one or more selected from hydrogen type beta zeolite, sodium type beta zeolite and rare earth modified beta zeolite, preferably hydrogen type beta zeolite, wherein rare earth metal in the rare earth modified beta zeolite is selected from La, Ce, Pr and the like.
According to the present invention, the step (2) may include: mixing an aluminum source, a boron source and a second solvent, stirring for 0.5-5 hours at 10-90 ℃, adding an inorganic acid, and continuously stirring for 0.5-5 hours, preferably, mixing the aluminum source, the boron source and the second solvent, stirring for 0.5-3 hours at 10-60 ℃, adding the inorganic acid, and continuously stirring for 1-4 hours. The inorganic acid is well known to those skilled in the art, and may be one or more of hydrochloric acid, sulfuric acid, nitric acid, oxalic acid, acetic acid, and citric acid, and is preferably hydrochloric acid. The second solvent may be one or more selected from deionized water, distilled water, decationized water and ethanol, and is preferably deionized water.
According to the present invention, in the step (2), the aluminum source may be one or more selected from pseudo-boehmite, alumina, aluminum hydroxide and boehmite, and is preferably pseudo-boehmite. The boron source can be one or more selected from boric acid, aluminum borate and boron trifluoride, and boric acid is preferred.
According to the invention, in step (2), the concentration of hydrochloric acid may vary within wide limits, and may for example be between 10 and 36% by weight, preferably between 20 and 36% by weight; the weight ratio of the amounts of aluminium source and hydrochloric acid used may vary within wide limits and may be, for example, from 1: (0.1-0.3), preferably 1: (0.15-0.25), aluminum source is Al2O3And (6) counting.
According to the invention, the solids content of the modified binder can be 15 to 50% by weight, preferably 25 to 40% by weight.
According to the present invention, in the step (3), the drying temperature may be 60 to 200 ℃ and the time may be 1 to 24 hours, preferably, the temperature is 80 to 180 ℃ and the time is 2 to 12 hours; the temperature for calcination is 300-650 ℃ for 1-5 hours, preferably 350-500 ℃ for 1-3 hours. Drying is a well known operation to those skilled in the art, and in one embodiment, the drying may be spray drying, with an outlet temperature of 130-; in another embodiment, the drying may be a drying process, which may be carried out in a constant temperature oven at a temperature of 60-200 ℃ for a time of 2-24 hours. The calcination is also well known to those skilled in the art, and the calcination can be performed in a muffle furnace or a tube furnace, and the calcination atmosphere is not particularly limited, and for example, an air atmosphere or an inert atmosphere, which may contain an inert gas, and the inert gas may be one or more of nitrogen, helium and argon.
According to the invention, clays are well known to those skilled in the art and may be selected, for example, from one or more of kaolin, rectorite, diatomaceous earth, montmorillonite, bentonite and sepiolite.
The third aspect of the invention provides an application of the catalytic cracking assistant provided by the first aspect of the invention in catalytic cracking of raw oil.
When the catalytic cracking assistant is used in the catalytic cracking process, the catalytic cracking assistant can be independently added into a catalytic cracking reactor, and can also be mixed with a catalytic cracking catalyst for use. In one embodiment, the amount of the catalytic cracking aid is 1 to 50 wt% based on the total amount of the catalytic cracking aid and the catalytic cracking catalyst.
The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.
The raw materials used are specified below:
kaolin, manufactured by Suzhou Kaolin corporation, has a solids content of 76% by weight;
pseudo-boehmite was produced by Shandong aluminum works, and the content of alumina was 62.0 wt%;
the alumina content in the alumina sol was 21.5 wt%;
the hydrochloric acid is produced by a Beijing chemical plant, and the specification is analytically pure, and the mass concentration is 36%;
phosphoric acid is produced by a Beijing chemical plant, and the specification is analytically pure, and the mass concentration is 85 percent;
diammonium hydrogen phosphate, produced by Beijing chemical plant, of analytically pure specification, containing P2O552.3 wt%;
ammonium dihydrogen phosphate, produced by Beijing chemical plant, with analytical purity and containing P2O560.5 wt%;
hydrogen form beta zeolite having a solids content of 75 wt.%, SiO2With Al2O3In a molar ratio of 25, Na2The O content was 0.15% by weight; the hydrogen type beta zeolite is produced by China petrochemical catalyst company Limited, and the other reagents are produced by China pharmaceutical group chemical reagent company Limited, and the specifications are analytically pure.
Specific surface area measurement: the sample was measured at 1.33X 10 by low temperature static nitrogen adsorption volumetric method using ASAP 2405N V1.01.01 automatic adsorption apparatus of Micromeritics, USA-2Vacuum degassing at Pa and 300 deg.C for 4 hr, and adding N2For the adsorption media, the adsorption-desorption isotherm of the sample was determined at 77.4K. Calculating the specific surface area (S) of the sample according to the BET formulaBET)。
Pore volume of water droplets: measuring the pore volume Q/SH 3360-206 of the test sample by a water drop method;
abrasion index: the abrasion index Q/SH 3360-208 of the test sample is determined by a straight tube method;
the composition analysis of the modified beta zeolite, the modified binder and the catalytic cracking assistant is as follows: determining the composition by X-ray fluorescence spectroscopy (XRF);
analyzing element content: the mass content of B and Al in the modified binder is measured by chemical analysis ICP, and the molar ratio of B and Al can be obtained by conversion, which is well known to those skilled in the art and will not be described herein again.
Micro-inverse activity index: the light oil micro-reaction activity of the modified beta zeolite and the catalytic cracking assistant is evaluated by adopting a standard method of RIPP92-90 (see the compilation of petrochemical analysis method (RIPP test method), Yancui and the like, published by scientific publishing company, 1990), the sample loading is 5.0g, the reaction temperature is 460 ℃, the raw oil is straight-run light diesel oil with the distillation range of 235 and 337 ℃, the product composition is analyzed by gas chromatography, and the micro-reaction activity index is calculated according to the product composition.
When the micro-inverse activity index of the modified beta zeolite is measured, the solid in the slurry containing the modified beta zeolite is taken out by a filtering method, dried and roasted at 500 ℃ for 3 hours to obtain the modified beta zeolite, and the micro-inverse activity index is measured by adopting the method.
The microreflective activity index (gasoline production below 216 ℃ in the product + gas production + coke production)/total feed x 100%.
Preparation examples 1 to 8 are illustrative of the preparation method of the catalytic cracking assistant of the present invention, and preparation comparative examples 1 to 4 are illustrative of the preparation method of the catalytic cracking assistant for comparison.
Preparation of example 1
(1) 267 g of hydrogen type beta zeolite was slurried with 400 g of deionized water, 27.2 g of diammonium hydrogen phosphate and 3.13 g of copper sulfate pentahydrate were added, the pH of the mixture was adjusted to 4.0 with hydrochloric acid (concentration: 20% by weight), and the mixture was stirred at 40 ℃ for 6 hours to obtain a slurry containing modified beta zeolite. Through analysis, the P in the modified beta zeolite is measured2O5Content of (2.9%) CuOThe amount was 0.5 wt% and the microreflective index was 62.
(2) Mixing 154g of pseudo-boehmite and 563g of deionized water, pulping for 15min, and uniformly dispersing; adding boric acid into the slurry, and stirring at room temperature (20 deg.C) for 1 h; then 40g of concentrated hydrochloric acid (the concentration is 36 weight percent) solution is slowly added, and the mixture is continuously stirred for 3 hours at room temperature, thus obtaining the modified binder. The Al in the modified binder is measured by analysis2O3Is 79% by weight, B2O3The content of (B) was 21% by weight, the molar ratio of B to Al was 0.37, the pH of the modified binder was 2.5, and the solid content was 15% by weight.
(3) And (2) mixing and stirring the slurry containing the modified beta zeolite obtained in the step (1), the modified binder obtained in the step (2), 895 g of kaolin and 1500 g of deionized water uniformly, spray-drying the obtained slurry, and roasting for 2 hours at 450 ℃ in an air atmosphere to obtain a catalytic cracking assistant C1, wherein the composition and properties of the catalytic cracking assistant C1 are shown in Table 1.
Preparation of example 2
(1) After beating 400 g of hydrogen-form beta zeolite with 900 g of deionized water, 58.3 g of ammonium dihydrogen phosphate and 1.52 g of copper chloride were added, the pH of the mixture was adjusted to 3.0 with dilute hydrochloric acid (concentration: 25% by weight), and the mixture was stirred at room temperature for 12 hours to obtain a slurry containing modified beta zeolite. Through analysis, the P in the modified beta zeolite is measured2O5Is 12 wt%, CuO is 0.3 wt%, and the micro-inversion activity index is 61.
(2) Mixing 301g of pseudo-boehmite and 636g of deionized water, pulping for 20min, and uniformly dispersing; adding boric acid into the slurry, and stirring for 2h at 60 ℃; then, 103g of concentrated hydrochloric acid (with the concentration of 36 weight percent) solution is slowly added, and the mixture is continuously stirred for 2 hours, so that the modified binder is obtained. The Al in the modified binder is measured by analysis2O3In an amount of 85 wt.%, B2O3The content of (B) was 15% by weight, the molar ratio of B to Al was 0.28, the pH of the modified binder was 2.2, and the solid content was 20% by weight.
(3) And (3) mixing and stirring the slurry containing the modified beta zeolite obtained in the step (1), the modified binder obtained in the step (2), 632 g of kaolin and 2000 g of deionized water uniformly, spray-drying the obtained slurry, and roasting at 500 ℃ for 3 hours in an air atmosphere to obtain the catalytic cracking assistant C2, wherein the composition and properties of the catalytic cracking assistant C2 are shown in Table 1.
Preparation of example 3
(1) 667 g of hydrogen type beta zeolite was taken, slurried with 1000 g of deionized water, added with 64.9 g of phosphoric acid and 7.01 g of copper nitrate, the pH of the mixture was adjusted to 3.0 with dilute phosphoric acid (35% by weight concentration), and stirred at 60 ℃ for 2 hours to obtain a slurry containing modified beta zeolite. The P of the modified beta zeolite is measured by analysis2O5The content of (b) is 8 wt%, the content of CuO is 0.6 wt%, and the micro-inversion activity index is 65.
(2) 435g of pseudo-boehmite and 324g of deionized water are mixed and pulped for 20min and are dispersed uniformly; adding boric acid into the slurry, and stirring for 2h at 60 ℃; then 187g of concentrated hydrochloric acid (concentration: 36 wt%) solution was slowly added thereto, and stirring was continued for 2 hours to obtain a modified binder. The Al in the modified binder is measured by analysis2O3The mass content is 90 wt%, B2O3The content of (B) was 10% by weight, the molar ratio of B to Al was 0.18, the pH of the modified binder was 3.5, and the solid content was 30% by weight.
(3) And (2) mixing and stirring the slurry containing the modified beta zeolite obtained in the step (1), the modified binder obtained in the step (2), 263 g of kaolin and 2000 g of deionized water uniformly, spray-drying the obtained slurry, and roasting for 2 hours at 450 ℃ in an air atmosphere to obtain the catalytic cracking assistant C3, wherein the composition and properties of the catalytic cracking assistant C3 are shown in Table 1.
Preparation of example 4
(1) After 533 g of hydrogen-type beta zeolite was slurried with 1200 g of deionized water, 64 g of ammonium dihydrogen phosphate and 1.87 g of copper nitrate were added, the pH of the mixture was adjusted to 4.0 with dilute hydrochloric acid (30% by weight), and the mixture was stirred at 60 ℃ for 5 hours to obtain a slurry containing modified beta zeolite. Through analysis, the P in the modified beta zeolite is measured2O5The content of (A) is 10 wt%, the content of CuO is 0.2 wt%, and the micro-inversion activity index is 63.
(2) Mixing 508g of pseudo-boehmite and 1182g of deionized water, pulping for 30min, and uniformly dispersing; adding boric acid toStirring the slurry for 1 hour at room temperature; then 193g of concentrated hydrochloric acid (the concentration is 36 weight percent) solution is slowly added, and the mixture is continuously stirred for 3 hours at room temperature, thus obtaining the modified binder. The Al in the modified binder is measured by analysis2O3In an amount of 90 wt.%, B2O3The content of (B) was 10% by weight, the molar ratio of B to Al was 0.18, the pH of the modified binder was 3.3, and the solid content was 18% by weight.
(3) And (3) mixing and stirring the slurry containing the modified beta zeolite obtained in the step (1), the modified binder obtained in the step (2), 329 g of kaolin and 2000 g of deionized water uniformly, spray-drying the obtained slurry, and roasting at 500 ℃ for 1.5h in an air atmosphere to obtain the catalytic cracking assistant C4, wherein the composition and the properties of the catalytic cracking assistant are shown in Table 1.
Preparation of example 5
(1) 333 g of hydrogen-type beta zeolite was taken, slurried with 1000 g of deionized water, 24.36 g of phosphoric acid and 3.38 g of copper chloride were added, the pH of the mixture was adjusted to 2.5 with dilute hydrochloric acid (concentration: 25% by weight), and the mixture was stirred at 90 ℃ for 2 hours to obtain a slurry containing modified beta zeolite. Through analysis, the P in the modified beta zeolite is measured2O5The content of (a) is 6 wt%, the content of CuO is 0.8 wt%, and the micro-inversion activity index is 68.
(2) Mixing 132g of pseudo-boehmite and 193g of deionized water, pulping for 20min, and uniformly dispersing; adding boric acid into the slurry, and stirring for 2h at 60 ℃; then, 45.6g of concentrated hydrochloric acid (the concentration is 36 weight percent) solution is slowly added, and the mixture is continuously stirred for 2 hours, so that the modified binder is obtained. The Al in the modified binder is measured by analysis2O3Content of (B) 82 wt%, (B)2O3The content of (a) was 18% by weight, the molar ratio of B to Al was 0.33, the pH of the modified binder was 2.8, and the solid content was 25% by weight.
(3) And (2) mixing and stirring the slurry containing the modified beta zeolite obtained in the step (1), the modified binder obtained in the step (2), 855 g of kaolin and 2000 g of deionized water uniformly, spray-drying the obtained slurry, and roasting at 500 ℃ for 5 hours in an air atmosphere to obtain the catalytic cracking assistant C5. The composition and properties are shown in table 1.
Preparation of example 6
A catalytic cracking assistant C6 was prepared in the same manner as in preparation example 1, except that in step (1), 267 g of hydrogen form beta zeolite was taken, slurried with 400 g of deionized water, 7.44 g of diammonium hydrogen phosphate and 0.63 g of copper sulfate pentahydrate were added, the pH of the mixture was adjusted to 4.0 with dilute hydrochloric acid (20% by weight), and the mixture was stirred at 40 ℃ for 6 hours to obtain a slurry containing modified beta zeolite. Through analysis, the P in the modified beta zeolite is measured2O5The content of (a) is 1.8% by weight, the content of CuO is 0.1% by weight, and the micro-inversion activity index is 58.
The composition and properties of the catalytic cracking assistant C6 are shown in Table 1.
Preparation of example 7
Preparing a catalytic cracking assistant C7 by the same method as the preparation example 1, except that in the step (2), 184g of pseudo-boehmite and 563g of deionized water are mixed and pulped for 15min and uniformly dispersed; adding boric acid into the slurry, and stirring at room temperature (20 ℃) for 1 h; then, 35g of concentrated hydrochloric acid (with the concentration of 36 weight percent) solution is slowly added, and the mixture is continuously stirred for 3 hours at room temperature, so as to obtain the modified binder. The Al in the modified binder is measured by analysis2O3In an amount of 95 wt.%, B2O3The content of (B) was 5 wt%, the molar ratio of B to Al was 0.09, the pH of the modified binder was 3.4, and the solid content was 15 wt%.
The composition and properties of the catalytic cracking assistant C7 are shown in Table 1.
Preparation of comparative example 1
2000 g of deionized water and 632 g of kaolin are added into a reaction kettle, the mixture is pulped for 60 minutes at room temperature, 300 g of hydrogen type beta zeolite is added, 1000 g of alumina sol is added into the slurry after the mixture is pulped for 30 minutes, after the mixture is stirred for 30 minutes, the obtained slurry is roasted for 3 hours at 500 ℃ after being sprayed and dried, and the comparative catalytic cracking assistant D1 is obtained, wherein the composition and the properties of the catalytic cracking assistant D1 are shown in Table 2.
Preparation of comparative example 2
The ferrophosphorus modified beta zeolite was prepared according to the method of example 4 in patent CN 1872685A. The procedure of preparative example 2 was then followed except that the phosphoiron-modified beta zeolite was used in place of the phosphocopper-modified beta zeolite of the present invention.
Adding 2000 g of deionized water and 632 g of kaolin into a reaction kettle, pulping for 60 minutes at room temperature, adding 355 g of pseudo-boehmite, continuing stirring for 30 minutes, then adding 55 g of hydrochloric acid (the mass ratio of the hydrochloric acid to the alumina is 0.25), stirring for 90 minutes, adding 300 g of ferrophosphorus modified beta zeolite, and pulping for 30 minutes; finally, 93g of alumina sol was added to the above slurry, and after stirring for 30 minutes, the obtained catalyst slurry having a solid content of 28% by weight was spray-dried and then calcined at 500 ℃ for 3 hours to obtain a comparative catalytic cracking aid D2, the composition and properties of which are shown in Table 2.
Preparation of comparative example 3
Modified beta zeolite was prepared according to the procedure of example 2 in patent CN 104998681A: (1) using NH from zeolite4Cl solution exchange washing to Na2The content of O is lower than 0.2 weight percent, and a filter cake is obtained by filtration; drying the filter cake obtained in the step (1), roasting the obtained sample at 150 ℃ for 2 hours, then heating to 350 ℃ for 30 minutes, roasting for 2 hours, then heating to 500 ℃ for 30 minutes, roasting for 4 hours, removing the template agent, and obtaining a molecular sieve; (3) taking 100g (dry basis) of the molecular sieve obtained in the step (2), adding water to prepare molecular sieve slurry with the solid content of 40 weight percent, and mixing with 11.8g of H3PO4(concentration 85% by weight) with 6.3g of CuC12Mixing, soaking and drying the solution dissolved in 90g of water to obtain a sample; (4) and (4) roasting the sample obtained in the step (3) at 550 ℃ for 2 hours to obtain the modified beta molecular sieve containing phosphorus and copper.
The catalytic cracking aid was then prepared according to the method of example 18 in CN 104998681A: 300 g of modified beta molecular sieve containing phosphorus and copper, 632 g of kaolin and 355 g of pseudo-boehmite are taken, decationized water and alumina sol are added for pulping for 120 minutes, and FeC1 is added under the stirring3·6H2Aqueous solution of O (FeC 1)3Concentration 30% by weight FeC1 used in the examples below3·6H2Concentration of O in aqueous solution, FeC1, not otherwise specified3Concentration was 30 wt%), a slurry having a solid content of 30 wt% was obtained, hydrochloric acid was added to make the value of the slurry 3.0, the slurry was beaten for 45 minutes, and then, a phosphor-alumina gel was added to the slurry, and the mixture was stirred for 30 minutes, and then the obtained slurry was warmed at the dry gas inletSpray drying at 500 deg.C and tail gas temperature of 180 deg.C to obtain microsphere with average particle diameter of 65 μm. The microspheres were calcined at 500 ℃ for hours. Mixing the obtained microsphere product with a diammonium hydrogen phosphate aqueous solution with the concentration of 5 weight percent according to the weight ratio of 1: 10, heating the mixture to 60 ℃, reacting for 20 minutes at constant temperature, filtering in vacuum, drying, and then roasting for 2 hours at 500 ℃ to obtain a comparative catalytic cracking aid D3, the composition and properties of which are shown in table 2.
Preparation of comparative example 4
A modified beta molecular sieve containing phosphorus and copper was prepared by the same method as in comparative example 3, except that a modified binder containing boron was prepared by the method of example 7 in CN 109499498A, and the specific steps were as follows:
mixing 1613g of pseudo-boehmite and 1950g of deionized water, pulping and uniformly dispersing; 9475g of zirconium oxychloride ZrOCl 8H is taken2O and 103g of ethanol are added into the slurry, the temperature is raised to 80 ℃, and the mixture is stirred for 1 hour; then, 302g of boric acid is slowly added, stirring is continued for 2h at 80 ℃, 284g of hydrochloric acid solution (36 wt.%) is added, and stirring is carried out for 3h, so as to obtain the boron-containing modified sol.
The slurry of modified beta zeolite containing phosphorus and copper, the modified binder containing boron, kaolin and deionized water are mixed and stirred uniformly, the obtained slurry is subjected to spray drying, and then is roasted for 2 hours at 450 ℃ in an air atmosphere to obtain the catalytic cracking assistant D4, and the composition and properties of the catalytic cracking assistant D4 are shown in Table 1.
Examples 1 to 7
The catalytic cracking aids C1-C7 prepared in preparation examples 1-7 of the present invention and SGC-1 industrial catalyst (provided by the chinese petrochemical catalyst, zilu division, incorporated, main properties are shown in table 3) were mixed in proportion to form a catalyst mixture, and the catalyst mixture was aged at 800 ℃ with 100% water vapor for 17 hours in a fixed bed aging apparatus. The evaluation was then carried out on an ACE apparatus, and the properties of the raw oils used for the evaluation are shown in Table 4. The reaction temperature, the catalyst-oil ratio, the weight hourly space velocity and the evaluation results are shown in tables 5 to 6.
Wherein, the conversion rate is gasoline yield, liquefied gas yield, dry gas yield and coke yield;
butene concentration ═ butene yield/liquefied gas yield.
Comparative examples 1 to 4
The same feed oil was catalytically cracked in the same manner as in examples 1 to 7, except that D1-D4 prepared in preparation examples 1 to 4 were used in place of the catalytic cracking assistant prepared in preparation example of the present invention, and the evaluation results are shown in Table 6.
TABLE 1 composition and physicochemical Properties of catalytic cracking Assistant
TABLE 2 composition and physicochemical Properties of catalytic cracking Assistant
TABLE 3 Properties of commercial catalyst SGC-1
Name (R)
SGC-1
Chemical composition/weight%
RE2O3
3.4
Al2O3
52.3
Na2O
0.16
Physical Properties
Specific surface area/(m)2×g-1)
269
Pore volume/(mL × g)-1)
0.38
Bulk density/(g × cm)-3)
0.75
Sieving mass composition/%
0～20mm
1.5
0～40mm
12.8
0～149mm
90.1
APSmm
76.8
Abrasion index/(%)
1.2
MA(800℃/4h)
78
TABLE 4 Properties of the feed oils
TABLE 5 evaluation results
TABLE 6 evaluation results
As can be seen from tables 5-6, the total yields of the gasoline and the liquefied gas in the embodiment 2 of the invention are respectively improved by 2.17 percent, 1.21 percent, 1.19 percent and 1.80 percent compared with the comparative examples 1-4; the yield of the diesel oil is respectively reduced by 1.87, 0.95, 0.84 and 0.98 percentage points; the yield of the carbon tetraolefin is respectively improved by 1.17 percent, 0.88 percent, 1.01 percent and 0.95 percent, and the concentration of the carbon tetraolefin in the liquefied gas is respectively improved by 5.73 percent, 2.95 percent, 3.19 percent and 2.92 percent. The catalytic cracking assistant containing beta zeolite prepared by the method has excellent yield and selectivity of carbon four-olefin, higher heavy oil cracking capability and better diesel oil conversion capability.
The preferred embodiments of the present disclosure have been described in detail above, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
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