阅读说明：本技术 一种催化裂化油浆脱除固体颗粒预处理的方法及其应用 (Pretreatment method for removing solid particles from catalytic cracking slurry oil and application thereof ) 是由 李康 雷杰 刘丹禾 韩海波 李治 魏小波 于 2019-10-31 设计创作，主要内容包括：本发明公开了一种催化裂化油浆脱除固体颗粒预处理的方法及其应用。包括以下步骤：催化裂化油浆在脱除固体颗粒之前进行空化处理以,改善所述催化裂化油浆的物性。通过以上的方法,可以改善催化裂化油浆的物性尤其是胶质、沥青质的组分结构,能够有效的解决催化裂化油浆过滤过程中粘度高,胶质沥青质堵塞滤芯的问题,达到进一步提高过滤效率,延长过滤周期的目的。(The invention discloses a pretreatment method for removing solid particles from catalytic cracking slurry oil and application thereof. The method comprises the following steps: the catalytic cracking slurry oil is subjected to cavitation treatment before solid particles are removed so as to improve the physical properties of the catalytic cracking slurry oil. By the method, the physical properties of the catalytic cracking slurry oil, particularly the component structures of colloid and asphaltene, can be improved, the problems of high viscosity and filter element blockage caused by colloid and asphaltene in the filtering process of the catalytic cracking slurry oil can be effectively solved, and the aims of further improving the filtering efficiency and prolonging the filtering period are fulfilled.)

1. A pretreatment method for removing solid particles from catalytic cracking slurry oil is characterized by comprising the following steps: the catalytic cracking slurry oil is subjected to cavitation treatment before solid particles are removed so as to improve the physical properties of the catalytic cracking slurry oil.

2. The method of claim 1, comprising the steps of: directly performing cavitation treatment on the catalytic cracking slurry oil before removing solid particles;

preferably, the reaction pressure of the cavitation treatment is 2-20 Mpa, the temperature of the cavitation treatment is 100-350 ℃,

more preferably, the reaction pressure of the cavitation treatment is 4-12 MPa, and the temperature of the cavitation treatment is 200-350 ℃.

3. The method of claim 1, wherein the catalytically cracked slurry oil is diluted by blending a light oil before the cavitation pretreatment.

4. The method of claim 3, wherein the light oil comprises at least one of gasoline and diesel;

preferably, the gasoline comprises one or more of straight-run gasoline, catalytic gasoline and coker gasoline,

preferably, the addition amount of the gasoline is 0.5-10% of the total mass of the catalytic cracking slurry oil, and more preferably 1.0-2.0%.

5. The method as claimed in claim 3, wherein the catalytic cracking slurry oil diluted by the light oil blending is sequentially subjected to a first cavitation treatment and a second cavitation treatment.

6. The method as claimed in claim 5, wherein the first cavitation treatment is performed at a pressure of 1-2 Mpa and a temperature of 120-180 ℃.

7. The method as claimed in claim 5, wherein the pressure of the second cavitation treatment is 2-20 MPa, and the temperature of the cavitation treatment is 100-350 ℃;

preferably, the reaction pressure of the second cavitation treatment is 6-12 MPa, and the cavitation treatment temperature is 180-.

8. The method of claim 1, wherein the cavitation device used for the cavitation process comprises at least one of a venturi-type, a liquid whistle-type, a orifice plate-type, and a jet tube-type cavitation device.

9. The method according to any one of claims 2 to 8, further comprising a post-treatment, wherein the post-treatment is to filter the catalytic cracking slurry oil subjected to the cavitation treatment by using a filter screen;

preferably, the filter screen used for filtering comprises at least one of a stainless steel sintered wire mesh microporous filter element, a stainless steel powder sintered microporous filter element and a ceramic membrane filter element.

10. A method for removing solid particles from catalytic cracking slurry oil, characterized in that the catalytic cracking slurry oil is treated by the method of any one of claims 1 to 9, and then the treated catalytic cracking slurry oil is filtered by a filter screen to obtain the catalytic cracking slurry oil with the removed solid particles.

Technical Field

The invention relates to the technical field of petrochemical industry, in particular to a pretreatment method for removing solid particles from catalytic cracking slurry oil and application thereof.

Background

The catalytic cracking slurry oil is a special byproduct generated in the catalytic cracking process of heavy oil, and due to the physical properties of the slurry oil, such as high specific gravity, high molecular weight and high viscosity, the slurry oil especially contains more catalyst solid particles (the content of the catalyst solid particles is more than 2000 ppm), which limits the utilization rate of the catalytic cracking slurry oil. Along with the increase of the heavy degree of the catalytic cracking raw material, the yield of the catalytic slurry oil is increased, and how to solve the utilization problem of the catalytic slurry oil is urgent. The catalytic slurry oil is rich in heavy aromatics, so that the catalytic slurry oil can be further processed to be used as fuel oil and is also a raw material for producing high-quality petroleum coke, carbon black and rubber auxiliaries, but the further comprehensive utilization of the catalytic slurry oil is limited by the high solid particle content of the catalytic slurry oil. When the heavy fuel oil is directly used as a heavy fuel blending component, the solid particles in the oil slurry can accelerate the abrasion of a heating furnace nozzle, so that the ash is deposited on a furnace tube, and the thermal efficiency is seriously influenced; the catalyst particle content in the catalytic slurry oil is required to be less than 500ppm as raw materials for producing carbon black and rubber extender oil; the production of needle coke requires that the content of catalyst particles in the catalytic slurry oil is less than 100 ppm; the production of carbon fiber requires that the content of catalyst particles in catalytic oil slurry is less than 20ppm, so that the removal of catalyst solid particles from catalytic cracking oil slurry is an urgent problem to be solved.

At present, the method for removing solid catalyst particles from catalytic cracking slurry oil mainly aims at the improvement of separation equipment and separation process, for example, the improvement of the separation equipment has large workload and high investment cost, and the improvement of the separation process may bring other side reactions or impurities to reduce the quality of products. How to rapidly and effectively remove solid particles in catalytic cracking slurry oil is a problem to be solved.

In view of this, the invention is particularly proposed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a pretreatment method for removing solid particles from catalytic cracking slurry oil and application thereof.

The invention is realized by the following steps:

in a first aspect, an embodiment of the present invention provides a pretreatment method for removing solid particles from catalytic cracking oil slurry, including the following steps: the catalytic cracking slurry oil is subjected to cavitation treatment before solid particles are removed so as to improve the physical properties of the catalytic cracking slurry oil.

At present, the method for removing solid catalyst particles from catalytic cracking slurry oil mainly aims at the improvement of separation equipment and a separation process, the improvement of the separation equipment needs, the improvement of separation work involves multiple steps, and the method has the advantages and disadvantages that the removal efficiency is low.

The inventor finds out through long-term practice that: before removing solid catalyst particles from the catalytic cracking slurry, the catalytic cracking slurry is subjected to cavitation treatment to improve the physical properties of the catalytic cracking slurry. The method improves the solid removal efficiency by improving the physical properties of the catalytic cracking slurry oil, is simple and easy to operate, has low energy consumption and low maintenance cost, is easy to realize industrialization, and has good removal efficiency.

The process for treating catalytic cracking slurry oil by cavitation has the following characteristics: the cavitation treatment of the catalytic cracking slurry oil before entering the filtering system mainly utilizes the extreme energy of high temperature, high pressure, micro jet and the like generated when bubbles are broken in the cavitation process to make partial macromolecular groups and small molecular groups break chains to form respective free radical groups, in particular to colloid asphaltene and condensed ring macromolecules. Along with the recombination of the macromolecular free radicals and the micromolecular free radicals in the cavitation process, the micromolecular free radicals are easy to combine to cause the association degree of the asphaltene to be reduced due to the characteristics of small size, small steric hindrance and the like of the micromolecular free radicals, partial asphaltene is converted into colloid, so that the whole catalytic cracking oil slurry colloid system becomes looser to achieve the effects of viscosity reduction and lightening, colloid asphaltene particles can be effectively prevented from blocking micropores of a filter element in the subsequent solid catalyst particle separation process, the pressure drop rise can be slowed down, and the filtering period of the filter element can be further prolonged; in addition, in the regeneration process of the filter element, a loose colloid system is more easily dissolved in the cleaning agent, the back flushing regeneration time of the filter element is shortened, and the treatment capacity of the catalytic cracking slurry oil is further improved.

In an alternative embodiment, the method comprises the following steps: directly carrying out cavitation treatment on the catalytic cracking slurry oil before removing solid particles;

preferably, the reaction pressure of the cavitation treatment is 2-20 Mpa, the temperature of the cavitation treatment is 100-350 ℃,

more preferably, the reaction pressure of the cavitation treatment is 4-12 MPa, and the temperature of the cavitation treatment is 200-350 ℃.

Compared with the method for directly removing the solid particles from the catalytic cracking slurry, the method for pretreating the solid particles removed from the catalytic cracking slurry provided by the embodiment of the invention has the advantages that the catalytic cracking slurry is subjected to cavitation treatment before the solid particles are removed, and the solid particles are dispersed in the catalytic cracking slurry and are difficult to remove due to the physical characteristics of the catalytic cracking slurry, such as large specific gravity, large molecular weight and high viscosity, and the cavitation treatment is performed before the solid particles are removed, so that the physical properties of the raw materials, particularly the component structures of colloid and asphaltene, can be improved through the cavitation treatment, the viscosity of the catalytic cracking slurry is reduced, and the solid particles contained in the catalytic cracking slurry are easy to remove from the catalytic cracking slurry during filtration. Preferably, the reaction pressure of the cavitation treatment is 2-20 Mpa, the cavitation treatment temperature is 100-350 ℃, the catalytic cracking slurry oil has better fluidity at the temperature, and the cavitation treatment can play a role in viscosity reduction, so that solid particles in the catalytic cracking slurry oil are easy to remove.

In an alternative embodiment, the catalytic cracking slurry is diluted by blending with a light oil prior to the cavitation pretreatment.

In an alternative embodiment, the light oil comprises one or more of gasoline and diesel;

preferably, the gasoline comprises at least one of straight run gasoline, catalytic gasoline and coker gasoline;

preferably, the gasoline is added in an amount of 0.5-10%, more preferably 1.0-2.0% of the total mass of the catalytic cracking slurry oil.

The embodiment of the invention provides a pretreatment method for removing solid particles from catalytic cracking slurry oil, wherein the catalytic cracking slurry oil is doped with light oil before removing the solid particles, and then subjected to cavitation treatment, so that more micromolecular free radicals with high hydrogen content are provided in the light oil, the cavitation effect can be obviously improved, on the basis, the viscosity of the catalytic cracking slurry oil is further reduced, and the solid removal efficiency is improved.

In an alternative embodiment, the catalytic cracking slurry oil after being diluted by the light oil is subjected to the first cavitation treatment and the second cavitation treatment in sequence.

In an alternative embodiment, the first cavitation process is performed at a pressure of 1-2 MPa and a temperature of 120-.

In an optional embodiment, the pressure of the second cavitation treatment is 2-20 Mpa, and the cavitation treatment temperature is 100-;

preferably, the reaction pressure of the second cavitation treatment is 6-12 MPa, and the cavitation treatment temperature is 180-250 ℃.

The embodiment of the invention provides a pretreatment method for removing solid particles from catalytic cracking slurry oil, wherein the catalytic cracking slurry oil is doped with light oil before removing the solid particles, and then subjected to cavitation treatment twice, wherein the first cavitation treatment is carried out at lower temperature and pressure, so that the light oil and the catalytic cracking slurry oil are mixed more uniformly, local non-uniform mixing is avoided, a filter screen is blocked when large components of the catalytic cracking slurry oil are filtered, the second cavitation treatment is carried out at higher temperature, and the cavitation treatment has a viscosity reducing effect at the temperature, so that the catalytic cracking slurry oil has good fluidity and solid particles in the catalytic cracking slurry oil are easily removed through the filter screen.

In alternative embodiments, the cavitation device comprises at least one of a venturi-type, a liquid whistle-type, a orifice plate-type, and a jet-tube cavitation device.

In an optional embodiment, the method further comprises post-treatment, wherein the post-treatment is to filter the catalytic cracking slurry oil subjected to the cavitation treatment by using a filter screen;

preferably, the filter screen used for filtering comprises at least one of a stainless steel sintered wire mesh microporous filter element, a stainless steel powder sintered microporous filter element and a ceramic membrane filter element.

In a second aspect, embodiments of the present invention provide a method for removing solid particles from a catalytic cracking slurry oil, the method comprising: the catalytic cracking slurry oil is treated by the method, and then the treated catalytic cracking slurry oil is filtered by a filter screen to obtain the catalytic cracking slurry oil without solid particles.

The embodiment of the invention provides a method for removing solid particles in catalytic cracking slurry oil. Based on the above, in the embodiment of the invention, the catalytic cracking slurry oil is treated by cavitation, and high energy in the cavitation process breaks partial macromolecules, so that the molecular size of the colloidal asphaltene is reduced, the blockage of the colloidal asphaltene on the filter holes is effectively reduced, the solubility of the colloidal asphaltene is greatly improved, and the regeneration performance of the filter element is improved. Therefore, the method has good application effect on removing solid particles in the catalytic cracking slurry oil.

The invention has the following beneficial effects:

the invention provides a pretreatment method for removing solid particles from catalytic cracking slurry oil and application thereof. The method comprises the following steps: the catalytic cracking slurry oil is subjected to cavitation treatment before solid particles are removed so as to improve the physical properties of the catalytic cracking slurry oil. By the method, the physical properties of the catalytic cracking slurry oil, particularly the component structures of colloid and asphaltene, can be improved, the problems that the catalytic cracking slurry oil is high in viscosity in the subsequent filtering process and the colloid asphaltene blocks the filter element can be effectively solved, and the aims of further improving the filtering efficiency and prolonging the filtering period are fulfilled.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The features and properties of the present invention are described in further detail below with reference to examples.

The catalytic cracking slurry oil with the same composition is adopted in the embodiment of the invention and the comparative example.

Examples 1-5 below are catalytic cracking slurries that were directly subjected to cavitation prior to filtration.