A catalytic cracking unit slurry oil scale inhibitor and a preparation method thereof

Abstract

The application discloses a catalytic cracking device oil slurry scale inhibitor and a preparation method thereof, and relates to the field of oil slurry scale inhibition. The oil slurry scale inhibitor comprises the following components in percentage by mass: a dispersant 15-25%; an antioxidant 1-5%; and a solvent 72-82%. The oil slurry scale inhibitor has simple and easy-to-implement preparation procedures, low cost, and can effectively improve the comprehensive performance of the oil slurry scale inhibitor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil slurry fouling, in particular to a catalytic cracking unit oil slurry fouling inhibitor and a preparation method thereof. BACKGROUND

[0002] In recent years, as a heavy oil deep processing technology to improve the economic efficiency of the refinery, the catalytic cracking of residual oil technology is increasingly popular and popular, and the coking and fouling of catalytic cracking oil slurry is increasingly serious and common. The coking and fouling of oil slurry system will seriously affect the normal operation of the device. This coking and fouling material reduces the heat transfer efficiency of the heat exchanger, increases the resistance in the pipeline transportation, causes the oil slurry and raw material heat exchange final temperature to decrease, the steam generation amount to decrease, the device energy consumption to increase, the excess heat of the oil slurry to be unable to take away, and the system heat balance to be destroyed. In severe cases, it often causes the oil slurry conveying system and the heat exchange system to be blocked, so as to stop working. At present, one of the most economical and effective methods is to add a trace amount of additive-oil slurry fouling inhibitor to the processed raw material to inhibit the formation of scale.

[0003] The existing fouling inhibitor has complex raw material composition, complicated preparation process and high cost. For example, the patent 201910504574.5 contains a metal passivator in the composition, which can easily affect the ash content index of the oil slurry fouling inhibitor, and will inevitably affect the final fouling effect to some extent. In addition, the viscosity, thermal stability and dispersion performance of the oil slurry fouling inhibitor are required to be high, so there is an urgent need for an oil slurry fouling inhibitor with low cost, simple preparation process and excellent comprehensive performance. SUMMARY

[0004] The purpose of the present application is to overcome the above-mentioned problems, provide a catalytic cracking unit oil slurry fouling inhibitor and a preparation method thereof, which can effectively improve the comprehensive performance of the oil slurry fouling inhibitor, and the preparation process is simple and easy to operate, and the cost is low.

[0005] In order to achieve the above-mentioned purpose of the application, the technical scheme adopted by the present application is:

[0006] A catalytic cracking unit oil slurry fouling inhibitor, characterized in that it comprises the following components in mass percentage:

[0007] 15-25% of dispersant;

[0008] 1-5% of antioxidant;

[0009] 72-82% of solvent.

[0010] The further improvement of the present application is that the dispersant is T154 dispersant.

[0011] The further improvement of the present application is that the purity of the antioxidant is > 92%, and the melting point is > 70℃.

[0012] A further improvement of the present invention is that the antioxidant is 4010 antioxidant.

[0013] A further improvement of the present invention is that the solvent is a mixed aromatic solvent.

[0014] The above-mentioned dispersant is an ashless dispersant prepared by thermal addition process using highly active polyisobutylene as the main raw material. It has good cleaning and dispersibility and a flash point of over 180℃.

[0015] The antioxidant mentioned above is antioxidant 4010, which has good dispersibility and thermal stability. When mixed with T154 dispersant, it can effectively improve its dispersibility and thermal stability, and reduce the viscosity of the system.

[0016] The solvent mentioned above is an additive prepared from cresol and isobutylene. This solvent can efficiently disperse the effective components of the scale inhibitor into the slurry.

[0017] A method for preparing a scale inhibitor for catalytic cracking unit oil slurry, characterized by comprising the following specific steps:

[0018] Step 1: The dispersant is pumped into a preheater using a vacuum pump for preheating. After preheating the dispersant to at least 25°C, the preheated dispersant is obtained.

[0019] Step 2: The preheated dispersant and solvent obtained in Step 1 are pumped into the mixing tank using a vacuum pump and mixed for 15 minutes to obtain a mixture.

[0020] Step 3: The mixture obtained in Step 2 is pumped into the reactor using a vacuum pump and stirred in a paddle mixer for 30 minutes to obtain the stirred material.

[0021] Step 4: The material obtained in Step 3 is pumped into the reaction vessel using a vacuum pump, and an antioxidant is added for compounding and stirring for 30 minutes to obtain the crude product.

[0022] Step 5: Filter the crude product obtained in Step 4 using a filter. The filtered product is the finished product.

[0023] Step 6: Take samples of the finished products for inspection. After passing the inspection, weigh them and package them for storage.

[0024] The different order of adding materials mentioned above has a certain impact on the performance of the scale inhibitor. The scale inhibitor prepared according to the order of adding materials of the present invention has a low freezing point and low viscosity after being added to the oil slurry, indicating that the scale inhibitor product prepared by using this order of adding materials has the best performance.

[0025] The beneficial effects of this invention are as follows:

[0026] This invention employs a formulation system of T154 dispersant, 4010 antioxidant, and mixed aromatic solvents. The raw materials are simple and readily available, and the preparation process is straightforward. It effectively inhibits scale formation and possesses a certain scale removal capability. By adding 4010 antioxidant, this invention effectively enhances the antioxidant capacity and thermal stability of the oil slurry scale inhibitor, ensuring that its properties and performance are not affected at higher temperatures. The T154 dispersant, 4010 antioxidant, and mixed aromatic solvent in this invention exhibit good miscibility, resulting in an oil slurry scale inhibitor with a low freezing point, low viscosity, and ease of use. Detailed Implementation

[0027] The technical solution of the present invention will be further described in detail below through specific embodiments: Embodiment 1

[0028] A scale inhibitor for catalytic cracking unit oil slurry comprises the following components by mass percentage: 15% dispersant; 3% antioxidant; and 82% solvent.

[0029] The above dispersant is T154 dispersant; the above antioxidant is 4010 antioxidant, with a purity >92% and a melting point ≥70℃; the above solvent is a mixed aromatic solvent.

[0030] A method for preparing a scale inhibitor for catalytic cracking unit oil slurry includes the following specific steps:

[0031] Step 1: The dispersant is pumped into a preheater using a vacuum pump for preheating. After preheating the dispersant to at least 25°C, the preheated dispersant is obtained.

[0032] Step 2: The preheated dispersant and solvent obtained in Step 1 are pumped into the mixing tank using a vacuum pump and mixed for 15 minutes to obtain a mixture.

[0033] Step 3: The mixture obtained in Step 2 is pumped into the reactor using a vacuum pump and stirred in a paddle mixer for 30 minutes to obtain the stirred material.

[0034] Step 4: The material obtained in Step 3 is pumped into the reaction vessel using a vacuum pump, and an antioxidant is added for compounding and stirring for 30 minutes to obtain the crude product.

[0035] Step 5: Filter the crude product obtained in Step 4 using a filter. The filtered product is the finished product.

[0036] Step 6: Take samples of the finished products for inspection. After passing the inspection, weigh them and package them for storage.

[0037] Example 2

[0038] A scale inhibitor for catalytic cracking unit oil slurry comprises the following components by mass percentage: 25% dispersant; 1% antioxidant; and 74% solvent.

[0039] The above dispersant is T154 dispersant; the above antioxidant is 4010 antioxidant, with a purity >92% and a melting point ≥70℃; the above solvent is a mixed aromatic solvent.

[0040] A method for preparing a scale inhibitor for catalytic cracking unit oil slurry includes the following specific steps:

[0041] Step 1: The dispersant is pumped into a preheater using a vacuum pump for preheating. After preheating the dispersant to at least 25°C, the preheated dispersant is obtained.

[0042] Step 2: The preheated dispersant and solvent obtained in Step 1 are pumped into the mixing tank using a vacuum pump and mixed for 15 minutes to obtain a mixture.

[0043] Step 3: The mixture obtained in Step 2 is pumped into the reactor using a vacuum pump and stirred in a paddle mixer for 30 minutes to obtain the stirred material.

[0044] Step 4: The material obtained in Step 3 is pumped into the reaction vessel using a vacuum pump, and an antioxidant is added for compounding and stirring for 30 minutes to obtain the crude product.

[0045] Step 5: Filter the crude product obtained in Step 4 using a filter. The filtered product is the finished product.

[0046] Step 6: Take samples of the finished products for inspection. After passing the inspection, weigh them and package them for storage.

[0047] Example 3

[0048] A scale inhibitor for catalytic cracking unit oil slurry comprises the following components by mass percentage: 23% dispersant; 5% antioxidant; and 72% solvent.

[0049] The above dispersant is T154 dispersant; the above antioxidant is 4010 antioxidant, with a purity >92% and a melting point ≥70℃; the above solvent is a mixed aromatic solvent.

[0050] A method for preparing a scale inhibitor for catalytic cracking unit oil slurry includes the following specific steps:

[0051] Step 1: The dispersant is pumped into a preheater using a vacuum pump for preheating. After preheating the dispersant to at least 25°C, the preheated dispersant is obtained.

[0052] Step 2: The preheated dispersant and solvent obtained in Step 1 are pumped into the mixing tank using a vacuum pump and mixed for 15 minutes to obtain a mixture.

[0053] Step 3: The mixture obtained in Step 2 is pumped into the reactor using a vacuum pump and stirred in a paddle mixer for 30 minutes to obtain the stirred material.

[0054] Step 4: The material obtained in Step 3 is pumped into the reaction vessel using a vacuum pump, and an antioxidant is added for compounding and stirring for 30 minutes to obtain the crude product.

[0055] Step 5: Filter the crude product obtained in Step 4 using a filter. The filtered product is the finished product.

[0056] Step 6: Take samples of the finished products for inspection. After passing the inspection, weigh them and package them for storage.

[0057] Example 4

[0058] A scale inhibitor for catalytic cracking unit oil slurry comprises the following components by mass percentage: 20% dispersant; 3% antioxidant; and 77% solvent.

[0059] The above dispersant is T154 dispersant; the above antioxidant is 4010 antioxidant, with a purity >92% and a melting point ≥70℃; the above solvent is a mixed aromatic solvent.

[0060] A method for preparing a scale inhibitor for catalytic cracking unit oil slurry includes the following specific steps:

[0061] Step 1: The dispersant is pumped into a preheater using a vacuum pump for preheating. After preheating the dispersant to at least 25°C, the preheated dispersant is obtained.

[0062] Step 2: The preheated dispersant and solvent obtained in Step 1 are pumped into the mixing tank using a vacuum pump and mixed for 15 minutes to obtain a mixture.

[0063] Step 3: The mixture obtained in Step 2 is pumped into the reactor using a vacuum pump and stirred in a paddle mixer for 30 minutes to obtain the stirred material.

[0064] Step 4: The material obtained in Step 3 is pumped into the reaction vessel using a vacuum pump, and an antioxidant is added for compounding and stirring for 30 minutes to obtain the crude product.

[0065] Step 5: Filter the crude product obtained in Step 4 using a filter. The filtered product is the finished product.

[0066] Step 6: Take samples of the finished products for inspection. After passing the inspection, weigh them and package them for storage.

[0067] Table 1. Main indicators of the scale inhibitor in the above embodiments.

[0068]

[0069]

[0070] Evaluation of scale inhibition effect

[0071] The evaluation test apparatus mainly includes a slurry pump (with adjustable flow rate), a scale measuring tube, and a heating furnace. Using catalytic cracking slurry from a certain plant as raw material, the slurry is pumped into the measuring tube at a flow rate of 120 g / h. The measuring tube is heated to a certain temperature and maintained constant in the heating furnace. As the slurry passes through, scale continuously accumulates on the inner wall of the measuring tube. After 24 hours, the measuring tube is cooled to room temperature, and the amount of scale is weighed and measured. The scale inhibition rate can be determined based on the different amounts of scale in the blank test group and the additive test group.

[0072] Blank test: No scale inhibitor added to the slurry; Additive test group: 100 ppm of scale inhibitor was added to the slurry.

[0073] Table 2: Results of scale inhibition effect evaluation test

[0074]

[0075] Comparative Example 2 is a conventional scale inhibitor composition (including dispersant, solvent and other excipient formulation). From Table 2, it can be clearly seen that the scale inhibition rate of the examples is higher than that of the comparative examples. It is clear that after replacing the complex excipients with 4010 antioxidant in Examples 1-4, better scale inhibition rate is still achieved with reduced cost and simplified preparation process.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A scale inhibitor for catalytic cracking unit slurry, characterized in that, It includes the following components by mass percentage: Dispersant 15-25%; Anti-aging agent 1-5%; Solvent 72-82%; Wherein, the dispersant is T154 dispersant; the antioxidant is 4010 antioxidant, the purity of the antioxidant is >92%, and the melting point is ≥70℃; the solvent is a mixed aromatic solvent; The preparation method of the above-mentioned oil slurry scale inhibitor includes the following steps: Step 1: The dispersant is pumped into a preheater using a vacuum pump for preheating. After preheating the dispersant to at least 25°C, the preheated dispersant is obtained. Step 2: The preheated dispersant and solvent obtained in Step 1 are pumped into the mixing tank using a vacuum pump and mixed for 15 minutes to obtain a mixture. Step 3: The mixture obtained in Step 2 is pumped into the reactor using a vacuum pump and stirred with a paddle for 30 minutes to obtain the stirred material; Step 4: The material obtained in Step 3 is pumped into the reaction vessel using a vacuum pump, and an antioxidant is added for compounding and stirring for 30 minutes to obtain the crude product. Step 5: Filter the crude product obtained in Step 4 using a filter. The filtered product is the finished product. Step 6: Take samples of the finished products for inspection. After passing the inspection, weigh them and package them for storage.

2. A method for preparing the scale inhibitor for catalytic cracking unit oil slurry as described in claim 1, characterized in that, The specific steps include the following: Step 1: The dispersant is pumped into a preheater using a vacuum pump for preheating. After preheating the dispersant to at least 25°C, the preheated dispersant is obtained. Step 2: The preheated dispersant and solvent obtained in Step 1 are pumped into the mixing tank using a vacuum pump and mixed for 15 minutes to obtain a mixture. Step 3: The mixture obtained in Step 2 is pumped into the reactor using a vacuum pump and stirred with a paddle for 30 minutes to obtain the stirred material; Step 4: The material obtained in Step 3 is pumped into the reaction vessel using a vacuum pump, and an antioxidant is added for compounding and stirring for 30 minutes to obtain the crude product. Step 5: Filter the crude product obtained in Step 4 using a filter. The filtered product is the finished product. Step 6: Take samples of the finished products for inspection. After passing the inspection, weigh them and package them for storage.

Images