A scale inhibitor for a hydrogenation device for heavy high-sulfur feedstock oil and a preparation method thereof

Abstract

This invention discloses a scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oils and its preparation method, belonging to the field of scale inhibitor technology. The scale inhibitor is composed of polyisobutylene succinimide dispersant, high-temperature resistant scale inhibitor dispersant, rust inhibitor, imidazoline corrosion inhibitor, antioxidant, sulfide chelating agent, detergent, calix carbazole alkylbenzene sulfonate, and solvent in specific weight parts. The preparation method involves heating the solvent to 80-100℃, then sequentially adding the remaining components and stirring for 30-40 minutes. This scale inhibitor, targeting the characteristics of heavy, high-sulfur feedstock oils, achieves high scale inhibition rate, excellent high-temperature stability, and strong resistance to sulfur corrosion through the synergistic effect of multiple components. It effectively solves the scaling and corrosion problems of hydrotreating units, extends the unit's operating cycle, and is suitable for hydrotreating processes of high-sulfur and high-asphaltite feedstock oils.

Description

Technical Field

[0001] This invention relates to the field of scale inhibitor technology, and in particular to a scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil and its preparation method. Background Technology

[0002] During hydrogenation, heavy, high-sulfur feedstocks (such as residual oil and coal tar) are prone to scaling on reactor and heat exchanger surfaces due to impurities such as sulfur, nitrogen, metals, and asphaltenes. This leads to decreased heat transfer efficiency, increased pressure drop, and even plant shutdown. Existing scale inhibitors are mostly designed for conventional crude oil and have limited effectiveness in inhibiting corrosive scaling and metal chelate deposition caused by mercaptans and hydrogen sulfide in heavy, high-sulfur oils.

[0003] Commercially available scale inhibitors for hydrogenation equipment also have some technical defects, such as poor resistance to sulfur corrosion, inability to resist the corrosion of equipment in high-sulfur environments, and difficulty in preventing the rapid formation of ferrous sulfide; insufficient dispersibility, with limited effect on dispersing high-content asphaltenes and gum agglomerates in heavy oil; poor high-temperature stability, easily decomposing and failing at hydrogenation reaction temperatures; and the use of toxic solvents by some scale inhibitors, posing a risk of secondary pollution.

[0004] To address the aforementioned problems, invention patent document CN107177379B discloses a hydrogenation scale inhibitor comprising the following components by weight percentage: 10%–30% detergent, 5–10% antioxidant, 0.5%–2% passivating agent, 0.5%–2% rust inhibitor, 1–2% co-solvent, and 50–70% organic solvent; the detergent being Mannich amine. This invention also provides a method for preparing the hydrogenation scale inhibitor, which involves taking the raw materials according to the proportions of each component and mixing them thoroughly at room temperature and pressure. This invention uses Mannich amine instead of other amines, resulting in better high-temperature stability, better cleaning effect on high-temperature components such as intake valves and nozzles, while also reducing exhaust emissions, lowering costs, and providing excellent scale inhibition performance. However, it still cannot adapt to the extreme operating conditions and core scaling problems of heavy, high-sulfur feedstock hydrogenation units.

[0005] Therefore, the development of a high-efficiency, high-temperature resistant scale inhibitor that is compatible with the hydrogenation environment for hydrogenation units dealing with heavy, high-sulfur feedstock oil has become an urgent need in the industry. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of the prior art and provide a high-efficiency, high-temperature resistant scale inhibitor that is compatible with the hydrogenation environment for hydrogenation units of heavy high-sulfur feedstock oil and its preparation method. The scale inhibitor has both excellent scale inhibition and anti-corrosion properties.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil, comprising the following components by weight: 10-12 parts of polyisobutylene succinimide dispersant, 18-22 parts of high-temperature resistant scale inhibitor dispersant, 0.5-1 part of rust inhibitor, 3-5 parts of imidazoline corrosion inhibitor, 2-4 parts of antioxidant, 1-3 parts of sulfide chelating agent, 10-13 parts of detergent, 1-3 parts of calix carbazole alkylbenzene sulfonate, and 38-42 parts of solvent.

[0008] Preferably, the polyisobutylene succinimide dispersant is ashless dispersant T-161.

[0009] Preferably, the high-temperature scale inhibitor and dispersant is high-temperature scale inhibitor and dispersant BWF-XZ292.

[0010] Preferably, the rust inhibitor is benzotriazole fatty acid amine salt T406.

[0011] Preferably, the imidazoline corrosion inhibitor is one or a mixture of oleic acid imidazoline, dodecyl imidazoline, and lauryl hydroxyethyl imidazoline.

[0012] Preferably, the antioxidant is a mixture of antioxidant T5570 and antioxidant 626 in a mass ratio of 1:(2-3).

[0013] Preferably, the sulfide chelating agent is zinc diethyldithiocarbamate.

[0014] Preferably, the detergent is calcium dodecylbenzenesulfonate.

[0015] Preferably, the preparation method of the calix carbazole alkylbenzene sulfonate includes the following steps: adding quaternary ammonium base calix [3] carbazole and dodecylbenzene sulfonic acid to water, stirring the reaction at 60-70℃ for 6-8h, after the reaction is completed, naturally cooling the system to room temperature, filtering with a Buchner funnel, collecting the filter cake, washing with deionized water 3-5 times, then washing with anhydrous ethanol 1-3 times, and finally drying in a vacuum drying oven for 12-16h to obtain calix carbazole alkylbenzene sulfonate. Elemental analysis confirmed that the product does not contain iodine.

[0016] Preferably, there are no special requirements for the source of the quaternary ammonium calix[3]carbazole. In one embodiment of the present invention, the quaternary ammonium calix[3]carbazole is prepared according to the method of Example 2 of the invention patent document with authorization publication number CN109836429B.

[0017] Preferably, the molar ratio of the quaternary ammonium calix[3] carbazole, dodecylbenzenesulfonic acid, and water is 1:3.1:(550-650).

[0018] Preferably, the solvent is a mixture of No. 200 solvent oil and S150 aromatic oil in a mass ratio of 1:(2-3).

[0019] Another objective of this invention is to provide a method for preparing the scale inhibitor for a hydrotreating unit that addresses heavy, high-sulfur feedstock oil, comprising the following steps: first, heating the solvent to 80-100°C, then adding the remaining components in sequence according to a ratio, and stirring at 80-100°C for 30-40 minutes to obtain the scale inhibitor for a hydrotreating unit that addresses heavy, high-sulfur feedstock oil.

[0020] Due to the application of the above technical solution, the present invention has the following beneficial effects: (1) The scale inhibitor for hydrogenation units of heavy, high-sulfur feedstock oil disclosed in this invention achieves high-efficiency scale inhibition through the synergistic effect of multiple components. The polyisobutylene succinimide dispersant (T-161) can effectively disperse asphaltenes, gums and other easily scale-forming components in heavy oil, and the sulfide chelating agent (zinc diethyldithiocarbamate) specifically chelates Fe. 2 ⁺、Ni 2 Metal ions such as ⁺ inhibit the formation of sulfide scale, while the detergent (calcium dodecylbenzenesulfonate) removes the microscale that has already formed on the equipment surface. The three work synergistically with the supramolecular recognition ability of calix carbazole alkylbenzenesulfonate to significantly reduce the scaling rate of heat exchangers and reactors in hydrogenation units and improve the operational stability of the equipment.

[0021] (2) The scale inhibitor disclosed in this invention for hydrogenation units of heavy high-sulfur feedstock oil, the high-temperature scale inhibitor and dispersant BWF-XZ292 and the antioxidant (T5570 and 626 compounded) form a high-temperature protection system, which can inhibit component decomposition under the high-temperature operating conditions of hydrogenation of heavy high-sulfur feedstock oil. The antioxidant blocks the oxidation chain reaction by capturing free radicals, ensuring that the core functions such as dispersion and chelation have a high retention rate at extreme temperatures, thus solving the problem of high-temperature failure of traditional scale inhibitors.

[0022] (3) The scale inhibitor for hydrogenation unit of heavy high-sulfur feedstock oil disclosed in this invention is an imidazoline corrosion inhibitor (such as oleic acid imidazoline) that forms a dense adsorption film on the metal surface to isolate corrosive media (H2S, organic acids, etc.), while the rust inhibitor benzotriazole fatty acid amine salt T406 specifically inhibits metal corrosion. The two work together to reduce the corrosion rate of the equipment, effectively protect the carbon steel and alloy steel parts of the hydrogenation unit, and extend the equipment maintenance cycle.

[0023] (4) The scale inhibitor for hydrogenation unit of heavy high-sulfur feedstock disclosed in this invention enhances the adaptability of the system to complex media by introducing calix carbazole alkylbenzene sulfonate. It has both surface activity and supramolecular recognition ability, which can help dispersants improve the dispersion efficiency of asphaltenes. At the same time, it adsorbs heavy metal ions through a specific structure and forms a "double chelation" effect with sulfide chelating agents, further reducing the risk of scaling in high-sulfur environment and improving the broad-spectrum applicability of scale inhibitor to heavy high-sulfur feedstock.

[0024] (5) The scale inhibitor for hydrogenation units of heavy high-sulfur crude oil disclosed in this invention uses a compound solvent of No. 200 solvent oil and S150 aromatic oil to ensure that each component dissolves rapidly at 80-100℃ and forms a homogeneous system, and can be industrialized without complex equipment; at the same time, the proportion of each component is optimized to avoid functional interference, so that the scale inhibitor can still play a stable role under hydrogenation conditions of high viscosity, high sulfur, high temperature and high pressure, and its applicable scope covers most heavy high-sulfur crude oil processing scenarios. Detailed Implementation

[0025] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0026] Example 1 A scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil comprises the following components by weight: 10 parts polyisobutylene succinimide dispersant, 18 parts high-temperature resistant scale inhibitor dispersant, 0.5 parts rust inhibitor, 3 parts imidazoline corrosion inhibitor, 2 parts antioxidant, 1 part sulfide chelating agent, 10 parts detergent, 1 part calix carbazole alkylbenzene sulfonate, and 38 parts solvent.

[0027] The polyisobutylene succinimide dispersant is ashless dispersant T-161; the high-temperature scale inhibitor dispersant is high-temperature scale inhibitor dispersant BWF-XZ292; the rust inhibitor is benzotriazole fatty acid amine salt T406; the imidazoline corrosion inhibitor is oleic acid imidazoline; the antioxidant is antioxidant T5570 and antioxidant 626 mixed in a mass ratio of 1:2; the sulfide chelating agent is zinc diethyldithiocarbamate; and the detergent is calcium dodecylbenzenesulfonate.

[0028] The preparation method of the calix carbazole alkylbenzene sulfonate includes the following steps: quaternary ammonium base calix [3] carbazole and dodecylbenzene sulfonic acid are added to water and stirred at 60°C for 6 hours. After the reaction is completed, the system is naturally cooled to room temperature, filtered by Buchner funnel, the filter cake is collected, washed 3 times with deionized water, washed once with anhydrous ethanol, and finally dried in a vacuum drying oven for 12 hours to obtain calix carbazole alkylbenzene sulfonate. Elemental analysis confirmed that the product does not contain iodine. The quaternary ammonium base calix [3] carbazole is prepared according to the method of Example 2 of the invention patent document with authorization publication number CN109836429B. The molar ratio of the quaternary ammonium base calix [3] carbazole, dodecylbenzene sulfonic acid, and water is 1:3.1:550.

[0029] The solvent is a mixture of No. 200 solvent oil and S150 aromatic oil in a mass ratio of 1:2.

[0030] A method for preparing a scale inhibitor for a hydrotreating unit that addresses heavy, high-sulfur feedstock oil includes the following steps: first, heating the solvent to 80°C, then adding the remaining components in sequence according to a ratio, and stirring at 80°C for 30 minutes to obtain the scale inhibitor for the hydrotreating unit that addresses heavy, high-sulfur feedstock oil.

[0031] Example 2 A scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil comprises the following components by weight: 10.5 parts polyisobutylene succinimide dispersant, 19 parts high-temperature resistant scale inhibitor dispersant, 0.6 parts rust inhibitor, 3.5 parts imidazoline corrosion inhibitor, 2.5 parts antioxidant, 1.5 parts sulfide chelating agent, 11 parts detergent, 1.5 parts calix carbazole alkylbenzene sulfonate, and 39 parts solvent.

[0032] The polyisobutylene succinimide dispersant is ashless dispersant T-161; the high-temperature scale inhibitor dispersant is high-temperature scale inhibitor dispersant BWF-XZ292; the rust inhibitor is benzotriazole fatty acid amine salt T406; the imidazoline corrosion inhibitor is dodecyl imidazoline; the antioxidant is antioxidant T5570 and antioxidant 626 mixed in a mass ratio of 1:2.3; the sulfide chelating agent is zinc diethyldithiocarbamate; and the detergent is calcium dodecylbenzenesulfonate.

[0033] The preparation method of the calix carbazole alkylbenzene sulfonate includes the following steps: quaternary ammonium base calix [3] carbazole and dodecylbenzene sulfonic acid are added to water and stirred at 63°C for 6.5 h. After the reaction is completed, the system is naturally cooled to room temperature, filtered by Buchner funnel, the filter cake is collected, washed 4 times with deionized water, washed 2 times with anhydrous ethanol, and finally dried in a vacuum drying oven for 13 h to obtain calix carbazole alkylbenzene sulfonate. Elemental analysis confirmed that the product does not contain iodine. The quaternary ammonium base calix [3] carbazole is prepared according to the method of Example 2 of the invention patent document with authorization publication number CN109836429B. The molar ratio of the quaternary ammonium base calix [3] carbazole, dodecylbenzene sulfonic acid, and water is 1:3.1:580.

[0034] The solvent is a mixture of No. 200 solvent oil and S150 aromatic oil in a mass ratio of 1:2.3.

[0035] A method for preparing a scale inhibitor for a hydrotreating unit that addresses heavy, high-sulfur feedstock oil includes the following steps: first, heating the solvent to 85°C, then adding the remaining components in sequence according to a ratio, and stirring at 85°C for 33 minutes to obtain the scale inhibitor for the hydrotreating unit that addresses heavy, high-sulfur feedstock oil.

[0036] Example 3 A scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil comprises the following components by weight: 11 parts polyisobutylene succinimide dispersant, 20 parts high-temperature scale inhibitor dispersant, 0.8 parts rust inhibitor, 4 parts imidazoline corrosion inhibitor, 3 parts antioxidant, 2 parts sulfide chelating agent, 11.5 parts detergent, 2 parts calix carbazole alkylbenzene sulfonate, and 40 parts solvent.

[0037] The polyisobutylene succinimide dispersant is ashless dispersant T-161; the high-temperature scale inhibitor dispersant is high-temperature scale inhibitor dispersant BWF-XZ292; the rust inhibitor is benzotriazole fatty acid amine salt T406; the imidazoline corrosion inhibitor is lauryl hydroxyethyl imidazoline; the antioxidant is antioxidant T5570 and antioxidant 626 mixed in a mass ratio of 1:2.8; the sulfide chelating agent is zinc diethyldithiocarbamate; and the detergent is calcium dodecylbenzenesulfonate.

[0038] The preparation method of the calix carbazole alkylbenzene sulfonate includes the following steps: quaternary ammonium salt calix [3] carbazole and dodecylbenzene sulfonic acid are added to water and stirred at 65°C for 7 hours. After the reaction is completed, the system is naturally cooled to room temperature, filtered by Buchner funnel, the filter cake is collected, washed 4 times with deionized water, washed 2 times with anhydrous ethanol, and finally dried in a vacuum drying oven for 14 hours to obtain calix carbazole alkylbenzene sulfonate. Elemental analysis confirmed that the product does not contain iodine. The quaternary ammonium salt calix [3] carbazole is prepared according to the method of Example 2 of the invention patent document with authorization publication number CN109836429B. The molar ratio of the quaternary ammonium salt calix [3] carbazole, dodecylbenzene sulfonic acid, and water is 1:3.1:600.

[0039] The solvent is a mixture of No. 200 solvent oil and S150 aromatic oil in a mass ratio of 1:2.5.

[0040] A method for preparing a scale inhibitor for a hydrotreating unit that addresses heavy, high-sulfur feedstock oil includes the following steps: first, heating the solvent to 90°C, then adding the remaining components in sequence according to a ratio, and stirring at 90°C for 35 minutes to obtain the scale inhibitor for the hydrotreating unit that addresses heavy, high-sulfur feedstock oil.

[0041] Example 4 A scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil comprises the following components by weight: 11.5 parts polyisobutylene succinimide dispersant, 21 parts high-temperature resistant scale inhibitor dispersant, 0.9 parts rust inhibitor, 4.5 parts imidazoline corrosion inhibitor, 3.5 parts antioxidant, 2.5 parts sulfide chelating agent, 12.5 parts detergent, 2.5 parts calix carbazole alkylbenzene sulfonate, and 41 parts solvent.

[0042] The polyisobutylene succinimide dispersant is ashless dispersant T-161; the high-temperature scale inhibitor dispersant is high-temperature scale inhibitor dispersant BWF-XZ292; the rust inhibitor is benzotriazole fatty acid amine salt T406; the imidazoline corrosion inhibitor is a mixture of oleic acid imidazoline, dodecyl imidazoline, and lauryl hydroxyethyl imidazoline in a mass ratio of 1:2:3; the antioxidant is a mixture of antioxidant T5570 and antioxidant 626 in a mass ratio of 1:2.8; the sulfide chelating agent is zinc diethyldithiocarbamate; and the detergent is calcium dodecylbenzenesulfonate.

[0043] The preparation method of the calix carbazole alkylbenzene sulfonate includes the following steps: quaternary ammonium salt calix [3] carbazole and dodecylbenzene sulfonic acid are added to water and stirred at 68°C for 7.5 h. After the reaction is completed, the system is naturally cooled to room temperature, filtered by Buchner funnel, the filter cake is collected, washed 5 times with deionized water, washed 3 times with anhydrous ethanol, and finally dried in a vacuum drying oven for 15 h to obtain calix carbazole alkylbenzene sulfonate. Elemental analysis confirmed that the product does not contain iodine. The quaternary ammonium salt calix [3] carbazole is prepared according to the method of Example 2 of the invention patent document with authorization publication number CN109836429B. The molar ratio of the quaternary ammonium salt calix [3] carbazole, dodecylbenzene sulfonic acid, and water is 1:3.1:640.

[0044] The solvent is a mixture of No. 200 solvent oil and S150 aromatic oil in a mass ratio of 1:2.8.

[0045] A method for preparing a scale inhibitor for a hydrotreating unit that addresses heavy, high-sulfur feedstock oil includes the following steps: first, heating the solvent to 95°C, then adding the remaining components in sequence according to a ratio, and stirring at 95°C for 38 minutes to obtain the scale inhibitor for the hydrotreating unit that addresses heavy, high-sulfur feedstock oil.

[0046] Example 5 A scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil comprises the following components by weight: 12 parts polyisobutylene succinimide dispersant, 22 parts high-temperature scale inhibitor dispersant, 1 part rust inhibitor, 5 parts imidazoline corrosion inhibitor, 4 parts antioxidant, 3 parts sulfide chelating agent, 13 parts detergent, 3 parts calix carbazole alkylbenzene sulfonate, and 42 parts solvent.

[0047] The polyisobutylene succinimide dispersant is ashless dispersant T-161; the high-temperature scale inhibitor dispersant is high-temperature scale inhibitor dispersant BWF-XZ292; the rust inhibitor is benzotriazole fatty acid amine salt T406; the imidazoline corrosion inhibitor is oleic acid imidazoline; the antioxidant is antioxidant T5570 and antioxidant 626 mixed in a mass ratio of 1:3; the sulfide chelating agent is zinc diethyldithiocarbamate; and the detergent is calcium dodecylbenzenesulfonate.

[0048] The preparation method of the calix carbazole alkylbenzene sulfonate includes the following steps: quaternary ammonium salt calix [3] carbazole and dodecylbenzene sulfonic acid are added to water and stirred at 70°C for 8 hours. After the reaction is completed, the system is naturally cooled to room temperature, filtered by Buchner funnel, the filter cake is collected, washed 5 times with deionized water, washed 3 times with anhydrous ethanol, and finally dried in a vacuum drying oven for 16 hours to obtain calix carbazole alkylbenzene sulfonate. Elemental analysis confirmed that the product does not contain iodine. The quaternary ammonium salt calix [3] carbazole is prepared according to the method of Example 2 of the invention patent document with authorization publication number CN109836429B. The molar ratio of the quaternary ammonium salt calix [3] carbazole, dodecylbenzene sulfonic acid, and water is 1:3.1:650.

[0049] The solvent is a mixture of No. 200 solvent oil and S150 aromatic oil in a mass ratio of 1:3.

[0050] A method for preparing a scale inhibitor for a hydrotreating unit that addresses heavy, high-sulfur feedstock oil includes the following steps: first, heating the solvent to 100°C, then adding the remaining components in sequence according to a ratio, and stirring at 100°C for 40 minutes to obtain the scale inhibitor for the hydrotreating unit that addresses heavy, high-sulfur feedstock oil.

[0051] Comparative Example 1 This example provides a scale inhibitor for a hydrotreating unit that addresses heavy, high-sulfur feedstock oil and its preparation method, which is basically the same as in Example 1, except that calix carbazole alkylbenzene sulfonate is not added.

[0052] Comparative Example 2 This example provides a scale inhibitor for a hydrotreating unit that addresses heavy, high-sulfur feedstock oil and its preparation method, which is basically the same as in Example 1, except that no sulfide chelating agent is added.

[0053] To further illustrate the beneficial technical effects of the scale inhibitors for hydrotreating units of heavy, high-sulfur feedstock oils involved in the various embodiments of the present invention, relevant performance tests were conducted on the products of Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1, and the test methods are as follows: 1. Experimental materials Heavy high-sulfur feedstock oil: density 920 kg / m³ 3 Sulfur content 4.2wt%, asphaltene content 10.5wt%, Ni+V content 156μg / g; 2. Experimental Methods (1) Total scale inhibition rate: The scale inhibition rate was calculated by using the plate method with 316L stainless steel plates (50mm×25mm×2mm), reaction conditions of 380℃, 12MPa, hydrogen-oil volume ratio of 800:1, reaction time of 4 hours, and scale inhibitor addition of 50ppm. (2) High temperature stability: Weigh 5 mg of the scale inhibitor sample of the present invention, place it in an Al2O3 crucible, and put it into a TGA sample cell; introduce nitrogen gas (flow rate 50 mL / min), heat to 100℃, and hold at the temperature for 30 min; switch to hydrogen gas (flow rate 50 mL / min, simulating hydrogen reduction atmosphere), heat to 380℃ at a rate of 10℃ / min, and hold at the temperature for 4 h; calculate the mass loss rate after holding at 380℃ for 4 h.

[0054] (3) Sulfur corrosion resistance: Using the plate-hanging method, the plates were hung at 380℃, 12MPa, and 5wt% sulfur for 48 hours, and the corrosion rate was calculated. The corrosion rate was calculated using the following formula: v = 8.76 × 10 4 ×(m0-m1) / (ρ×S×t) Where: m0 is the mass of the hanging plate before corrosion (g); m1 is the mass of the hanging plate after corrosion (g); ρ is the density of the hanging plate material (g / cm³). 3 (316L stainless steel ρ=7.98); S is the surface area of ​​the hanging plate (cm²) 2 ); t is the corrosion time (h); 8.76×10 4 The conversion factor is (1 year = 8760h, 1cm = 10mm).

[0055] Table 1. Performance test results of scale inhibitors for hydrotreating units handling heavy, high-sulfur feedstock. As shown in Table 1, the scale inhibitors for heavy high-sulfur feedstock hydrotreating units in Examples 1-5 showed a total scale inhibition rate that gradually increased to 98.1% with formulation optimization, a high-temperature decomposition rate that continuously decreased to 1.8%, and a corrosion rate that simultaneously decreased to 0.020 mm / a. In contrast, Comparative Example 1 without calixarazole alkylbenzene sulfonate and Comparative Example 2 without sulfide chelating agent were significantly inferior to the examples in terms of total scale inhibition rate (78.9%, 84.9%), high-temperature stability (high-temperature decomposition rate 7.9%, 8.6%), and sulfur corrosion resistance (corrosion rate 0.081 mm / a, 0.110 mm / a). This indicates that the synergistic effect of key components and formulation optimization can effectively improve the overall performance of the scale inhibitor.

[0056] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil, characterized in that, It includes the following components by weight: 10-12 parts polyisobutylene succinimide dispersant, 18-22 parts high-temperature scale inhibitor dispersant, 0.5-1 part rust inhibitor, 3-5 parts imidazoline corrosion inhibitor, 2-4 parts antioxidant, 1-3 parts sulfide chelating agent, 10-13 parts detergent, 1-3 parts calix carbazole alkylbenzene sulfonate, and 38-42 parts solvent; The preparation method of the calix carbazole alkylbenzene sulfonate includes the following steps: adding quaternary ammonium base calix [3] carbazole and dodecylbenzene sulfonic acid to water, stirring the reaction at 60-70℃ for 6-8h, after the reaction is completed, naturally cooling the system to room temperature, filtering with a Buchner funnel, collecting the filter cake, washing with deionized water 3-5 times, then washing with anhydrous ethanol 1-3 times, and finally drying in a vacuum drying oven for 12-16h to obtain calix carbazole alkylbenzene sulfonate; the molar ratio of the quaternary ammonium base calix [3] carbazole, dodecylbenzene sulfonic acid and water is 1:3.1:(550-650); The sulfide chelating agent is zinc diethyldithiocarbamate; the detergent is calcium dodecylbenzenesulfonate; and the solvent is a mixture of No. 200 solvent oil and S150 aromatic oil in a mass ratio of 1:(2-3).

2. The scale inhibitor for hydrotreating units of heavy, high-sulfur feedstock oil according to claim 1, characterized in that, The polyisobutylene succinimide dispersant is ashless dispersant T-161.

3. The scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil according to claim 1, characterized in that, The high-temperature scale inhibitor and dispersant is high-temperature scale inhibitor and dispersant BWF-XZ292.

4. The scale inhibitor for hydrotreating units of heavy, high-sulfur feedstock oil according to claim 1, characterized in that, The rust inhibitor is benzotriazole fatty acid amine salt T406.

5. The scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil according to claim 1, characterized in that, The imidazoline corrosion inhibitor is one or a mixture of oleic acid imidazoline, dodecyl imidazoline, and lauryl hydroxyethyl imidazoline.

6. The scale inhibitor for hydrotreating units dealing with heavy, high-sulfur feedstock oil according to claim 1, characterized in that, The antioxidant is a mixture of antioxidant T5570 and antioxidant 626 in a mass ratio of 1:(2-3).

7. A method for preparing a scale inhibitor for a hydrotreating unit for heavy, high-sulfur feedstock oil according to any one of claims 1-6, characterized in that, The process includes the following steps: First, heat the solvent to 80-100℃, then add the remaining components in proportion, and stir at 80-100℃ for 30-40 minutes to obtain a scale inhibitor for hydrogenation units that can handle heavy, high-sulfur feedstock oil.

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