阅读说明：本技术 一种纳米稀土复合阻聚剂、其制备方法及应用 (Nano rare earth composite polymerization inhibitor, preparation method and application thereof ) 是由 于旭东 于旭涛 于 2020-12-17 设计创作，主要内容包括：本申请涉及阻聚剂技术领域,具体公开了一种纳米稀土复合阻聚剂、其制备方法及应用。纳米稀土复合阻聚剂包括如下重量份数的组分：N,N-二甲基甲酰胺30-450份；4-羟基-2,2,6,6-四甲基哌啶氮氧自由基50-150份；抗氧剂10-60份；十二烷基苯磺酸钙20-50份；纳米稀土氧化物及纳米稀土衍生物10-50份；JM-1燃油增效剂400-800份；纳米稀土氧化物及纳米稀土衍生物由纳米稀土氧化物和纳米稀土衍生物混合组成。其制备方法为：先将N,N-二甲基甲酰胺等原料混合得到混合物,后加入JM-1燃油增效剂混合。本申请的纳米稀土复合阻聚剂可缓解催化剂孔隙表面结焦结垢,延长装置长周期正常运行。(The application relates to the technical field of polymerization inhibitors, and particularly discloses a nano rare earth composite polymerization inhibitor, and a preparation method and application thereof. The nano rare earth composite polymerization inhibitor comprises the following components in parts by weight: 30-450 parts of N, N-dimethylformamide; 50-150 parts of 4-hydroxy-2, 2,6, 6-tetramethyl piperidine nitroxide free radical; 10-60 parts of an antioxidant; 20-50 parts of calcium dodecyl benzene sulfonate; 10-50 parts of nano rare earth oxide and nano rare earth derivative; 400 portions and 800 portions of JM-1 fuel oil synergist; the nanometer rare earth oxide and the nanometer rare earth derivative are formed by mixing the nanometer rare earth oxide and the nanometer rare earth derivative. The preparation method comprises the following steps: firstly, mixing raw materials such as N, N-dimethylformamide and the like to obtain a mixture, and then adding JM-1 fuel oil synergist for mixing. The nano rare earth composite polymerization inhibitor can relieve coking and scaling on the surfaces of pores of the catalyst, and prolong the long-period normal operation of the device.)

1. The nano rare earth composite polymerization inhibitor is characterized by comprising the following components in parts by weight:

30-450 parts of N, N-dimethylformamide;

50-150 parts of 4-hydroxy-2, 2,6, 6-tetramethyl piperidine nitroxide free radical;

10-60 parts of an antioxidant;

20-50 parts of calcium dodecyl benzene sulfonate;

10-50 parts of nano rare earth oxide and nano rare earth derivative;

750 portions of JM-1 fuel oil synergist 450-;

the nanometer rare earth oxide and the nanometer rare earth derivative are formed by mixing the nanometer rare earth oxide and the nanometer rare earth derivative according to the weight ratio of 1: 1.

2. The nano rare earth composite polymerization inhibitor according to claim 1, comprising the following components in parts by weight:

50-350 parts of N, N-dimethylformamide;

70-120 parts of 4-hydroxy-2, 2,6, 6-tetramethyl piperidine nitroxide free radical;

30-50 parts of an antioxidant;

30-40 parts of calcium dodecyl benzene sulfonate;

30-40 parts of nano rare earth oxide and nano rare earth derivative;

680 parts of JM-1 fuel oil synergist 450-;

the nanometer rare earth oxide and the nanometer rare earth derivative are formed by mixing the nanometer rare earth oxide and the nanometer rare earth derivative according to the weight ratio of 1: 1.

3. The nano rare earth composite polymerization inhibitor as claimed in claim 2, wherein the antioxidant is one or more of 2, 6-di-tert-butyl-p-cresol, N' -di-sec-butyl-p-phenylenediamine and 2, 6-di-tert-butylphenol.

4. The nano rare earth composite polymerization inhibitor as claimed in claim 2, wherein the nano rare earth oxide comprises one or more of nano lanthanum oxide, nano cerium oxide, nano praseodymium oxide and nano neodymium oxide; the nanometer rare earth derivative part comprises one or more of nanometer lanthanum derivative, nanometer cerium derivative, nanometer praseodymium derivative and nanometer neodymium derivative.

5. The nano rare earth composite polymerization inhibitor according to claim 2, further comprising 40 to 80 parts of a dispersant.

6. The nano rare earth composite polymerization inhibitor according to claim 5, wherein the dispersant is one or more of polyisobutylene succinimide, polyisobutylene bis-succinimide, and polyisobutylene amine.

7. The method for preparing a nano rare earth composite polymerization inhibitor according to any one of claims 1 to 6, comprising the steps of:

s1, mixing N, N-dimethylformamide, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine nitroxide free radical, an antioxidant, calcium dodecylbenzene sulfonate, a nano rare earth oxide and a nano rare earth derivative to obtain a mixture;

s2, adding the JM-1 fuel oil synergist into the mixture, and mixing to obtain the nano rare earth composite polymerization inhibitor.

8. The method for preparing a nano rare earth composite polymerization inhibitor according to claim 7, wherein a dispersant is further added to the mixture and mixed with the mixture in S2.

9. The method for preparing a nano rare earth composite polymerization inhibitor according to claim 7, wherein the stirring temperature is set to 30 to 60 ℃ and the stirring time is set to 20 to 60min in S1, and the stirring temperature is set to 50 to 70 ℃ and the stirring time is set to 40 to 50min in S2.

10. The use of the nano rare earth composite polymerization inhibitor according to any one of claims 1 to 6, wherein the amount of the nano rare earth composite polymerization inhibitor added to the raw material is 40 to 500 ppm.

Technical Field

The application relates to the technical field of polymerization inhibitors, in particular to a nano rare earth composite polymerization inhibitor, a preparation method and application thereof.

Background

Hydrocracking is a process that converts large heavy oils into widely used small light oils. It can be used to prepare straight-run diesel oil, catalytic cracking circulating oil, coking distillate oil, etc. and can also be used to prepare gasoline, aviation kerosene and low-solidifying point diesel oil by deasphalting heavy residual oil. Hydrocracking units are one of the most important production units in refineries. The regular large overhaul of the oil refining hydrogenation device is an important guarantee of safety, and the extension of the operation period of the hydrogenation device has great significance for safety management. When the hydrogenation device is used for a long time, the catalyst in the hydrogenation device needs to be replaced, taking 170 ten thousand tons of residual oil hydrogenation devices in an oil refinery as an example, the catalyst replacement cost is between thirty-four million each time, the period of the replacement and the assembly is usually eighteen months, and the time of the replacement and the assembly is two weeks. In order to extend the life cycle of hydrogenation units, polymerization inhibitors have been produced. According to the effect of inhibiting the polymerization reaction, substances capable of terminating each radical to stop the polymerization reaction until they are completely exhausted are called polymerization inhibitors.

The polymerization inhibitor is a compound which prevents unsaturated hydrocarbons from undergoing polymerization reactions during processing, purification and transportation, and which reacts with free radicals in the system to form stable products, thereby preventing polymerization reactions from occurring. According to the mechanism of action, polymerization inhibitors can be classified into phenolic polymerization inhibitors, quinone polymerization inhibitors, aromatic nitro compound polymerization inhibitors, inorganic polymerization inhibitors, and the like. The polymerization inhibitor is in liquid state, can be mixed with the raw materials in advance according to a certain concentration and then fed, and can also be added into the system together with the raw materials according to a certain proportion by a metering pump during continuous feeding.

In the actual production application, after the polymerization inhibitor is used, the scale inhibition and scale removal effects are poor, so that the effect of prolonging the normal operation time of an oil refining device and a hydrogenation device is not obvious.

Disclosure of Invention

In order to improve the scale inhibition and scale removal performance of the polymerization inhibitor and prolong the normal operation time of an oil refining and hydrogenation device, the application provides the nano rare earth composite polymerization inhibitor, and the preparation method and the application thereof.

In a first aspect, the application provides a nano rare earth composite polymerization inhibitor, which adopts the following technical scheme:

a nano rare earth composite polymerization inhibitor comprises the following components in parts by weight:

30-450 parts of N, N-dimethylformamide;

50-150 parts of 4-hydroxy-2, 2,6, 6-tetramethyl piperidine nitroxide free radical;

10-60 parts of an antioxidant;

20-50 parts of calcium dodecyl benzene sulfonate;

10-50 parts of nano rare earth oxide and nano rare earth derivative;

400 portions and 800 portions of JM-1 fuel oil synergist;

the nanometer rare earth oxide and the nanometer rare earth derivative are formed by mixing the nanometer rare earth oxide and the nanometer rare earth derivative according to the weight ratio of 1: 1.

By adopting the technical scheme, N, N-dimethylformamide is taken as a main solvent; the added 4-hydroxy-2, 2,6, 6-tetramethyl piperidine nitroxide radical is mainly used for preventing olefin monomers from self-polymerization in the processes of production, separation, refining, storage or transportation, and controlling and adjusting the polymerization degree of olefins and derivatives thereof, thereby playing a role in inhibiting polymerization; the incorporation of an antioxidant can retard or inhibit the progress of the polymer oxidation process, thereby preventing the aging of the polymer and prolonging the service life of the polymer; the calcium dodecyl benzene sulfonate is used as a cleaning agent, so that the cleaning dispersibility of the raw materials can be improved, and the phenomenon of scaling on the surface of the catalyst and in the hydrogenation device can be relieved.

The addition of the JM-1 fuel oil synergist can prevent oil products from condensing to form a coking precursor, relieve the pressure drop rising trend of a heat exchange system and a reactor, and prolong the operation period of a hydrogenation device. By adding the nanometer rare earth oxide and the nanometer rare earth derivative, the slightly polymerized organic matters can be decomposed while the polymerization of the organic matters is prevented, and the scale inhibition and removal performance of the polymerization inhibitor is improved, so that the normal operation time of the oil refining and hydrogenation device is prolonged.

Preferably, the composition comprises the following components in parts by weight:

50-350 parts of N, N-dimethylformamide;

70-120 parts of 4-hydroxy-2, 2,6, 6-tetramethyl piperidine nitroxide free radical;

30-50 parts of an antioxidant;

30-40 parts of calcium dodecyl benzene sulfonate;

30-40 parts of nano rare earth oxide and nano rare earth derivative;

680 parts of JM-1 fuel oil synergist 450-;

the nanometer rare earth oxide and the nanometer rare earth derivative are formed by mixing the nanometer rare earth oxide and the nanometer rare earth derivative according to the weight ratio of 1: 1.

By adopting the technical scheme, the weight parts of N, N-dimethylformamide, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine nitroxide free radical, an antioxidant, calcium dodecylbenzene sulfonate, a nano rare earth oxide, a nano rare earth derivative and a JM-1 fuel oil synergist are optimized, and the prepared nano rare earth composite polymerization inhibitor has good polymerization inhibition and descaling effects within the weight part range, and can effectively prolong the normal operation time of an oil refining device and a hydrogenation device.

Preferably, the antioxidant is one or more of 2, 6-di-tert-butyl-p-cresol, N' -di-sec-butyl-p-phenylenediamine and 2, 6-di-tert-butylphenol.

By adopting the technical scheme, the antioxidant has good oil solubility, strong oxidation resistance and good heat resistance and stability, does not influence the color of an oil product after being added, and can obviously prolong the service life of the nano rare earth composite polymerization inhibitor.

Preferably, the nano rare earth oxide comprises one or more of nano lanthanum oxide, nano cerium oxide, nano praseodymium oxide and nano neodymium oxide; the nanometer rare earth derivative part comprises one or more of nanometer lanthanum derivative, nanometer cerium derivative, nanometer praseodymium derivative and nanometer neodymium derivative.

By adopting the technical scheme, the nanometer rare earth oxide and the nanometer rare earth derivative have the function of accelerating polymerization, and can decompose slightly polymerized organic matters while preventing the polymerization of the organic matters. The nanometer rare earth oxide swells soft and solid scales attached in a catalyst pipeline or on the surface of the catalyst into small powder and falls off, so that the activity of the catalyst is improved, the service cycle of the catalyst is prolonged, the catalyst is prevented from being coated and inactivated, the maintenance frequency of a system is reduced, and the long-term operation of an oil refining and hydrogenation device is kept. The nanometer rare earth derivatives have the functions of inhibiting polymerization and removing scale by being converted into nanometer rare earth oxides.

Preferably, the detergent also comprises 40-80 parts of a dispersing agent.

Preferably, the dispersant is one or more of polyisobutylene succinimide, polyisobutylene bis-succinimide and polyisobutylene amine.

By adopting the technical scheme, the dispersing agent can keep better dispersing capacity at high temperature, has two opposite properties of lipophilicity and hydrophilicity, can be better dispersed in raw oil by adding the polymerization inhibitor, and improves the polymerization inhibition and descaling effects of the polymerization inhibitor, so that the normal operation time of oil refining and hydrogenation devices is improved, and the lubricating performance of oil can be improved.

In a second aspect, the application provides a preparation method of a nano rare earth composite polymerization inhibitor, which adopts the following technical scheme:

a preparation method of a nano rare earth composite polymerization inhibitor comprises the following steps:

s1, mixing N, N-dimethylformamide, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine nitroxide free radical, an antioxidant, calcium dodecylbenzene sulfonate, a nano rare earth oxide and a nano rare earth derivative to obtain a mixture;

s2, adding the JM-1 fuel oil synergist into the mixture, and mixing to obtain the nano rare earth composite polymerization inhibitor.

By adopting the technical scheme, the operation is simple, the conditions are easy to control, and the dispersibility of each component in the mixture is improved by mixing step by step, so that the prepared nano rare earth composite polymerization inhibitor is beneficial to reducing the temperature difference and the pressure difference of the reactor, inhibiting the generation of colloid in the heating process, preventing the colloid from being attached to the pores of the catalyst, ensuring the high-efficiency use of the catalyst and improving the normal operation time of an oil refining and hydrogenation device.

Preferably, a dispersant is further added into the mixture of S2 and mixed.

By adopting the technical scheme, the added dispersing agent can ensure that the prepared nano rare earth composite polymerization inhibitor has better dispersibility in raw materials, and the effects of inhibiting polymerization and removing scale are improved, so that the normal operation time of a hydrogenation device is prolonged.

Preferably, in the step S1, the stirring temperature is set to be 30-60 ℃, the stirring time is set to be 20-60min, and in the step S2, the stirring temperature is set to be 50-70 ℃, and the stirring time is set to be 40-50 min.

By adopting the technical scheme, the components can be fully mixed under the stirring condition, so that the prepared nano rare earth composite polymerization inhibitor has consumed polymerization inhibition and descaling performances.

In a third aspect, the application provides an application of a nano rare earth composite polymerization inhibitor, which adopts the following technical scheme:

the application of the nano rare earth composite polymerization inhibitor comprises 40-500ppm of the nano rare earth composite polymerization inhibitor in raw materials.

By adopting the technical scheme, better polymerization inhibition and descaling effects can be achieved by adopting less dosage, and meanwhile, the influence of polymerization inhibitor components on raw materials can be reduced by using less dosage.

In summary, the present application has the following beneficial effects:

1. by adding the nanometer rare earth oxide and the nanometer rare earth derivative, the slightly polymerized organic matters can be accelerated to be decomposed while the polymerization of the organic matters is prevented, the polymerization inhibition and scale removal performance of the polymerization inhibitor is improved, the maintenance frequency of an oil refining and hydrogenation device is reduced, the long-period operation of the oil refining and hydrogenation device is kept, and the production cost is saved;

2. the method has simple operation and easily regulated and controlled conditions, and improves the dispersibility of each component in the polymerization inhibitor and the polymerization inhibition and scale removal performance of the polymerization inhibitor by mixing the raw materials in multiple steps;

3. according to the application, 40-500ppm of the nano rare earth composite polymerization inhibitor is added into the raw materials, so that good polymerization and scale removal effects can be achieved, and meanwhile, the influence of the nano rare earth composite polymerization inhibitor on the raw material components is reduced due to less dosage.

Detailed Description

The present application will be described in further detail with reference to examples.

The JM-1 fuel oil synergist in the embodiment of the application is obtained from Shanghai energy-collecting chemical company Limited, and the JM-1 fuel oil synergist is a mixture consisting of metal oil-soluble rare earth compounds of calcium and cerium of about 5 percent and 95 percent of white oil;

n, N-dimethylformamide is obtained from Shanghai Ji to Biochemical technology Limited;

4-hydroxy-2, 2,6, 6-tetramethyl piperidine nitroxide free radical is obtained from the scientific and technical company of Wuhan Hua.

2, 6-di-tert-butyl-p-cresol, N' -di-sec-butyl-p-phenylenediamine and 2, 6-di-tert-butylphenol are all collected from Jiangsu Ofu biotechnology limited;

the white oil is obtained from Shanghai Rongfu New Energy Technology Co., Ltd;

polyisobutylene succinimide, polyisobutylene bis-succinimide and polyisobutylene amine are all obtained from Nantong Runfeng petrochemical Co.Ltd;

the nanometer lanthanum oxide, the nanometer cerium oxide, the nanometer praseodymium oxide, the nanometer neodymium oxide, the lanthanum chloride, the cerium chloride and the praseodymium chloride are all collected from Xin Hu metal materials Limited company in Qinghe county, and the grain diameter is 50-100 nm.

Examples

Example 1: the nano rare earth composite polymerization inhibitor comprises the following components in parts by weight as shown in Table 1, and is prepared by the following steps:

s1, mixing N, N-dimethylformamide, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine nitroxide free radical, antioxidant, calcium dodecylbenzenesulfonate, nano rare earth oxide and nano rare earth derivative at 30 deg.C for 20min to obtain a mixture;

s2, adding the JM-1 fuel oil synergist into the mixture, and mixing for 40min at the temperature of 50 ℃ to obtain the nano rare earth composite polymerization inhibitor.

Wherein, the antioxidant adopts 2, 6-di-tert-butyl-p-cresol;

the nanometer rare earth oxide adopts nanometer lanthanum oxide;

the nanometer rare earth derivative adopts lanthanum chloride;

the nanometer rare earth oxide and the nanometer rare earth derivative are formed by mixing nanometer lanthanum oxide and lanthanum chloride according to the weight ratio of 1: 1.

When the prepared nano rare earth composite polymerization inhibitor is applied, the addition amount of the nano rare earth composite polymerization inhibitor in raw materials is 500 ppm.

Examples 2 to 6: a nano rare earth composite polymerization inhibitor is different from that of example 1 in that each component and the corresponding weight thereof are shown in Table 1.

TABLE 1 Components and weights (kg) thereof in examples 1-6

Example 7: the difference between the nano rare earth composite polymerization inhibitor and the embodiment 4 is that in the preparation process of the nano rare earth composite polymerization inhibitor, an antioxidant is prepared from 2, 6-di-tert-butyl-p-cresol and N, N' -di-sec-butyl-p-phenylenediamine according to the weight ratio of 1:1, mixing the components. The nanometer rare earth oxide adopts nanometer lanthanum oxide and nanometer cerium oxide, the nanometer rare earth derivative adopts lanthanum chloride and cerium chloride, and the nanometer rare earth oxide and the nanometer rare earth derivative are formed by mixing the nanometer lanthanum oxide, the nanometer cerium oxide, the lanthanum chloride and the cerium chloride according to the weight ratio of 1:1:1: 1.

Example 8: the difference between the nano rare earth composite polymerization inhibitor and the embodiment 4 is that in the preparation process of the nano rare earth composite polymerization inhibitor, an antioxidant is prepared from 2, 6-di-tert-butyl-p-cresol, N' -di-sec-butyl-p-phenylenediamine and 2, 6-di-tert-butylphenol in a weight ratio of 1:1:1, mixing the components. The nanometer rare earth oxide adopts nanometer neodymium oxide, nanometer cerium oxide and nanometer praseodymium oxide, the nanometer rare earth derivative adopts neodymium chloride, cerium chloride and praseodymium chloride, and the nanometer rare earth oxide and the nanometer rare earth derivative are prepared by mixing the nanometer neodymium oxide, the nanometer cerium oxide, the nanometer praseodymium oxide, the neodymium chloride, the cerium chloride and the praseodymium chloride according to the weight ratio of 1:1:1: 1.

Example 9: a difference of the nano rare earth composite polymerization inhibitor from the embodiment 4 is that 40kg of dispersant is also added in S2 in the preparation process of the nano rare earth composite polymerization inhibitor, and the dispersant adopts polyisobutylene succinimide.

Example 10: a difference of the nano rare earth composite polymerization inhibitor from the embodiment 4 is that 60kg of dispersant is also added in S2 in the preparation process of the nano rare earth composite polymerization inhibitor, and the dispersant is formed by mixing polyisobutylene succinimide and polyisobutylene bis-succinimide according to the weight ratio of 1: 1.

Example 11: a difference of the nano rare earth composite polymerization inhibitor from the embodiment 4 is that 80kg of dispersant is also added in S2 in the preparation process of the nano rare earth composite polymerization inhibitor, and the dispersant is prepared from polyisobutylene succinimide, polyisobutylene bis-succinimide and polyisobutylene amine according to the weight ratio of 1:1: 1.

Example 12: a nano rare earth composite polymerization inhibitor is different from that in the embodiment 4, in the preparation process of the nano rare earth composite polymerization inhibitor, the stirring temperature of S1 is set to be 60 ℃, the stirring time is set to be 60min, the stirring temperature of S2 is set to be 70 ℃, and the stirring time is set to be 50 min.

Example 13: a nano rare earth composite polymerization inhibitor is different from that in example 4 in that the addition amount of the prepared nano rare earth composite polymerization inhibitor in raw materials is 40ppm when the nano rare earth composite polymerization inhibitor is applied.

Comparative example

Comparative example 1: a polymerization inhibitor was different from example 4 in that no JM-1 fuel oil synergist was added during the preparation of the polymerization inhibitor.

Comparative example 2: a polymerization inhibitor is different from that in example 4 in that a nano rare earth oxide and a nano rare earth derivative are not added.

Comparative example 3: the polymerization inhibitor is different from the polymerization inhibitor in example 4 in that in the preparation process of the polymerization inhibitor, N-dimethylformamide, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine nitroxide free radical, an antioxidant, nano rare earth oxide and rare earth derivative, JM-1 fuel oil synergist and calcium dodecylbenzene sulfonate are mixed together.

Comparative example 4: a polymerization inhibitor was different from example 4 in that a commercially available metal deactivator was used as the polymerization inhibitor.

Comparative example 5: a polymerization inhibitor was different from example 4 in that a commercially available slurry oil scale inhibitor was used as the polymerization inhibitor.

Comparative example 6: a polymerization inhibitor was different from example 4 in that a commercially available wax oil scale inhibitor was used as the polymerization inhibitor.

Comparative example 7: a polymerization inhibitor was different from example 4 in that a commercially available residual oil scale inhibitor was used as the polymerization inhibitor.

Comparative example 8: a polymerization inhibitor was different from example 4 in that a commercially available scorch retarder was used as the polymerization inhibitor.

Comparative example 9: a polymerization inhibitor was different from example 4 in that a commercially available scorch inhibiting scale inhibitor was used as the polymerization inhibitor.

Performance test

The polymerization inhibitors prepared in examples 1 to 13 and comparative examples 1 to 9 were taken as test objects, 3 polymerization inhibitor samples were taken in each set of examples or comparative examples, and the polymerization inhibitor samples were respectively tested, and the test results were averaged.

Test one:

the test is carried out for 66 times, and the working condition test of 20 days is carried out on the DCC cracked naphtha hydrogenation device of 20 million tons/year in the elm oil refinery each time. The test method is as follows:

before adding the polymerization inhibitor sample, the hydrogenation device continuously produces for 10 days under normal conditions, from the 11 th day, under the condition that the original production working condition of the hydrogenation device is not changed, the polymerization inhibitor samples prepared in examples 1-10 and comparative examples 1-9 are respectively added, the addition amount of the polymerization inhibitor is 50ppm of the raw material each time, and the production is continued for 10 days. And detecting the first back pressure drop data and the second back pressure drop data of the hydrogenation device, and comparing the effect of adding the polymerization inhibitor sample with the first back pressure drop data and the second back pressure drop data.

The test results are shown in table 2 and table 3 below, wherein the daily average increase in one inverse pressure drop is (end date-inverse pressure drop-start date-inverse pressure drop)/day.

As can be seen from the data in tables 2 and 3, the daily average increase of the first counter pressure drop is 0.0072MPa in 1-10 days before the addition of the agent, and the second counter pressure drop has no obvious change. After the nano rare earth composite polymerization inhibitor prepared in examples 1-13 is added, the daily average increase of the first back pressure drop is less than 0.0050MPa, and examples 3 and 4 are better examples. According to the current situation of the device, when the pressure drop of one reaction reaches 0.44MPa, the shutdown maintenance is needed, and the startup duration (namely the normal operation time of the hydrogenation device) is deduced:

the start-up time is 0.44MPa per day;

the time for starting up without adding the polymerization inhibitor sample is as follows:

0.44MPa/(0.0072 MPa/day) 61 days;

the time for starting up under the condition of adding the polymerization inhibitor sample is as follows:

0.44MPa/(0.0050 MPa/day) 88 days;

after the nano rare earth composite polymerization inhibitor samples prepared in the embodiments 1 to 13 are added, the working time is prolonged by at least 27 days, and the working time is prolonged by at least about 44 percent compared with the sample without the polymerization inhibitor;

according to the data in the actual production, the cost can be saved by 220 ten thousand yuan for each 30 days of the start-up time, and at least 198 ten thousand yuan is saved after the nano rare earth composite polymerization inhibitor samples prepared in the embodiments 1 to 13 are added.

As can be seen by combining example 4 and comparative example 1, and by combining tables 2 and 3, the addition of JM-1 fuel oil synergist improves the scale inhibition performance of the inhibitor, reduces the daily average increase of the pressure drop, prolongs the operation time of the device, and saves the cost.

By combining the embodiment 4 and the comparative example 2 and combining the tables 2 and 3, it can be seen that the nano rare earth oxide and the nano rare earth derivative can improve the polymerization inhibition and scale inhibition performance of the polymerization inhibitor, reduce the daily average increase of the one-time back pressure drop, prolong the working time of the device and save the cost.

By combining the example 4 and the comparative example 3 and combining the tables 2 and 3, the step-by-step mixing can improve the dispersibility of each component in the mixture, so that the prepared nano rare earth composite polymerization inhibitor has better scale inhibition performance.

By combining the example 4 and the comparative examples 4 to 9 and combining the tables 2 and 3, it can be seen that the nano rare earth composite polymerization inhibitor prepared in the example 4 has obviously improved scale inhibition performance, obviously reduced daily average increase of the first inverse pressure drop and prolonged operation time of the device compared with other scale inhibitors which are sold in the market and can generate scale inhibition and scale removal effects.

TABLE 2 test results on days 1-10

TABLE 3 test results on days 10-20

And (2) test II:

the loading amount of the catalyst in the experiment is 60mL, the quartz sand is diluted by 140mL, the mixture is uniformly mixed and then loaded in a reactor, and the catalyst is FHUDA-8 catalyst.

In order to accelerate the process test progress, 500ppm of polymerization inhibitor is added into the raw materials, the nano rare earth composite polymerization inhibitor prepared in the embodiment 3 and the embodiment 4 is respectively adopted as the polymerization inhibitor, 10 days of process tests are carried out totally, and the cumulative dosage of the polymerization inhibitor is equivalent to the addition amount of 100 days when the process test is carried out according to 50 ppm. The 100-day run time represents a conditioning cycle, indicating the effect of the inhibitor on the catalyst activity and the deposition of metal components on the inhibitor.

Under the conditions that the hydrogen partial pressure is 7.90MPa and the volume space velocity is 1.5h^-1And the hydrogen-oil volume ratio was 500, the catalyst activity was analyzed by comparison, and the results are shown in table 4 below;

the analysis of the precipitation on the surface of the catalyst was carried out, and the results are shown in Table 5 below.

As can be seen from the test data in table 4: compared with the method without adding the polymerization inhibitor, the method has the advantages that the sulfur and nitrogen contents of the refined oil are lower, the density of the refined oil is basically equivalent, and the aromatic hydrocarbon content is lower after the polymerization inhibitor is added. It is demonstrated that the addition of the nano rare earth composite polymerization inhibitor prepared in example 3 and example 4 does not affect the activity of the catalyst.

TABLE 4 comparative analysis of catalyst Activity

As can be seen from the test data in table 5: the addition of the nano rare earth composite polymerization inhibitor far exceeding the dosage of the industrial device causes no obvious metal impurity deposition in the device, which shows that the nano rare earth composite polymerization inhibitor continuously used for 100 days according to the conventional dosage can not form metal deposition on the catalyst and can not obviously influence the activity stability of the hydrogenation catalyst.

TABLE 5 test results of the precipitation of metals on the surface of the catalyst after addition of polymerization inhibitor

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.