Multi-component scale inhibitor and method of preventing scale formation in petrochemical production

Abstract

This invention belongs to the field of scale inhibitor preparation technology, and more specifically, relates to a multi-component scale inhibitor and a method for preventing scale formation in petrochemical production. The multi-component scale inhibitor includes a first component, a second component, and a third component; the first component includes diene succinimide and di-sec-butyl-p-phenylenediamine; the second component includes a dodecylbenzenesulfonic acid organic amine salt; and the third component includes a 2,2,6,6-tetramethylpiperidinol nitroxide radical. The product obtained by this invention has excellent scale inhibition performance.

Description

Technical Field

[0001] This invention belongs to the field of scale inhibitor preparation technology, and more specifically, relates to a multi-component scale inhibitor and a method for preventing fouling in petrochemical production. Background Technology

[0002] Crude oil has a complex composition, and some crude oils contain heavy components such as asphaltenes, which easily deposit on the surface of heat exchangers, causing fouling and ultimately leading to heat exchanger blockage, reduced heat exchange efficiency, decreased production load, and even shutdown. Refineries typically add scale inhibitors to units prone to scaling, such as vacuum distillation tower bottom heat exchangers, residue hydrotreating feedstock heat exchangers, hydrocracking feedstock heat exchangers, and catalytic cracking slurry heat exchangers. However, current scale inhibitors primarily target calcium and magnesium ion salt deposits, with limited research on asphaltenes removal, and the corresponding scale inhibitors exhibiting low removal efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the problem of low scale inhibition efficiency of existing scale inhibitors, and to improve the scale inhibition efficiency of scale inhibitors by using multi-component scale inhibitors with synergistic effect.

[0004] The purpose of this invention is to provide a multi-component scale inhibitor.

[0005] Another object of the present invention is to provide a method for preventing fouling during petrochemical production.

[0006] The above-mentioned objective of this invention is achieved through the following technical solution:

[0007] This invention provides a multi-component scale inhibitor, which includes a first component, a second component, and a third component;

[0008] The first component includes diene succinimide and di-sec-butyl-p-phenylenediamine;

[0009] The second component includes dodecylbenzenesulfonic acid organic amine salt;

[0010] The third component includes 2,2,6,6-tetramethylpiperidinol nitroxide radicals.

[0011] The above technical solution employs a three-component scale inhibitor system. Specifically, diene succinimide and di-sec-butyl-p-phenylenediamine are used as the first component. Since di-sec-butyl-p-phenylenediamine has excellent amine antioxidant properties, it can effectively prevent diene succinimide from being oxidized at high temperatures during storage, thus affecting the scale inhibition efficiency. The second component is dodecylbenzenesulfonic acid organic amine salt, and the third component is 2,2,6,6-tetramethylpiperidinol nitroxide radical.

[0012] Firstly, in practical applications, the carboxyl groups of asphaltenes in crude oil form stable coordination compounds with calcium ions in the crude oil. Simultaneously, asphaltenes adsorb certain solid particles from the crude oil, such as catalysts, resulting in a more stable and firm deposition of asphaltenes in equipment and instruments. When a multi-component scale inhibitor is added, the organic amine in the second component, dodecylbenzenesulfonic acid organic amine salt, can combine with the hydroxyl groups in the metal, allowing the dodecylbenzenesulfonic acid organic amine salt to firmly adhere to the metal surface and form a polar surface, preventing the adsorption and deposition of non-polar asphaltenes on the metal surface. Simultaneously, the negatively charged sulfonate ions in the second component, dodecylbenzenesulfonic acid organic amine salt, adsorb into the asphaltenes, giving the asphaltenes an overall negative charge. Due to the repulsion of like charges, the intermolecular gaps in the asphaltenes widen, thus facilitating the penetration of the 2,2,6,6-tetramethylpiperidinol nitroxide free radicals from the third component. In asphaltene molecules, diene succinimide and di-sec-butyl-p-phenylenediamine combine with calcium ions to form complexes, thereby disrupting the stable structure of asphaltene. This allows the diene succinimide and di-sec-butyl-p-phenylenediamine in the first component to better penetrate and disperse between the lamellar molecular layers of asphaltene. Furthermore, the amino groups of diene succinimide and di-sec-butyl-p-phenylenediamine form hydrogen bonds with the hydroxyl, carboxyl, or amino groups in asphaltene, thus breaking up the aggregates formed by the planar overlap of asphaltene molecules and preventing asphaltene from stacking and depositing. Simultaneously, the 2,2,6,6-tetramethylpiperidinol nitroxide radical also acts as a polymerization inhibitor, preventing the polymerization and deposition of molecules in asphaltene. Secondly, in the first component, diene succinimide can also adsorb solid particles in asphaltene, causing insoluble substances to be in a colloidal suspension state, further loosening the overall structure of asphaltene and facilitating the dispersion of asphaltene by di-sec-butyl-p-phenylenediamine.

[0013] Furthermore, the multi-component scale inhibitor comprises the following components in parts by weight:

[0014] 45-60 parts of component one, 20-30 parts of component two, and 0.5-2 parts of component three;

[0015] In the first component, the mass ratio of diene succinimide to di-sec-butyl-p-phenylenediamine is 1-2:1.

[0016] Furthermore, the second component of the multi-component scale inhibitor also includes a solvent; the solvent is selected from any one or a mixture of n-butanol, propanol, and 2-pentanol.

[0017] Furthermore, the second component of the multi-component scale inhibitor also includes 5-6% by mass of pyrrolidone, and propylene glycol by mass equal to that of pyrrolidone.

[0018] The above technical solution, by adding pyrrolidone and propylene glycol, can, on the one hand, form hydrogen bonds with the active groups of asphaltenes through the hydroxyl groups contained in both, thereby saturating the hydrogen bonds between the asphaltenes molecules and preventing the asphaltenes molecules from depositing due to their own hydrogen bonding. On the other hand, the lubricating effect of pyrrolidone and propylene glycol can, in conjunction with the dodecylbenzenesulfonic acid organic amine salt, enable the asphaltenes to quickly detach from the metal surface and disperse in the device tank system.

[0019] Furthermore, the pyrrolidone is selected from any one of N-methyl-2-pyrrolidone, γ-pyrrolidone, and α-pyrrolidone.

[0020] Furthermore, the first component of the multi-component scale inhibitor also includes a solubilizer at 8-9% of the mass of the first component.

[0021] The above technical solution adds a solubilizer, and the long chain structure of the solubilizer causes the asphaltenes molecules to extend longitudinally, forming an easily combinable planar linear structure, thus avoiding the formation of a three-dimensional stacking structure and preventing the asphaltenes from agglomerating and accumulating.

[0022] Furthermore, the solubilizer is selected from any one of polyoxyethylene lauryl ester, polyoxyethylene stearate, and polyoxyethylene palmitate.

[0023] The present invention also provides a method for preventing fouling during petrochemical production, the method comprising the following steps:

[0024] The materials of the second and third components are added to the first component, stirred and mixed, and then fed into a heating box. After heating, the mixture is injected through a pipeline or sprayed through a nozzle into the petrochemical production unit for descaling.

[0025] Furthermore, the temperature of the heating chamber is 40-50℃; the time is 20-30 minutes.

[0026] Furthermore, the heating chamber also includes an antioxidant; the antioxidant is selected from any one of 3-hydroxy-2,4,6-trimethylpyridine, p-tert-butylphenol, and p-xylenol.

[0027] Beneficial effects: (1) This technical solution uses a three-component scale inhibitor system. Specifically, diene succinimide and di-sec-butyl-p-phenylenediamine are used as the first component. Since di-sec-butyl-p-phenylenediamine has excellent amine antioxidant properties, it can effectively prevent diene succinimide from being oxidized at high temperature during storage, thus affecting the scale inhibition efficiency. Dodecylbenzenesulfonic acid organic amine salt is used as the second component, and 2,2,6,6-tetramethylpiperidinol nitroxide free radical is used as the third component.

[0028] Firstly, in practical applications, the carboxyl groups of asphaltenes in crude oil form stable coordination compounds with calcium ions in the crude oil. Simultaneously, asphaltenes adsorb certain solid particles from the crude oil, such as catalysts, resulting in a more stable and firm deposition of asphaltenes in equipment and instruments. When a multi-component scale inhibitor is added, the organic amine in the second component, dodecylbenzenesulfonic acid organic amine salt, can combine with the hydroxyl groups in the metal, allowing the dodecylbenzenesulfonic acid organic amine salt to firmly adhere to the metal surface and form a polar surface, preventing the adsorption and deposition of non-polar asphaltenes on the metal surface. Simultaneously, the negatively charged sulfonate ions in the second component, dodecylbenzenesulfonic acid organic amine salt, adsorb into the asphaltenes, giving the asphaltenes an overall negative charge. Due to the repulsion of like charges, the intermolecular gaps in the asphaltenes widen, thus facilitating the penetration of the 2,2,6,6-tetramethylpiperidinol nitroxide free radicals from the third component. In asphaltene molecules, diene succinimide and di-sec-butyl-p-phenylenediamine combine with calcium ions to form complexes, thereby disrupting the stable structure of asphaltene. This allows the diene succinimide and di-sec-butyl-p-phenylenediamine in the first component to better penetrate and disperse between the lamellar molecular layers of asphaltene. Furthermore, the amino groups of diene succinimide and di-sec-butyl-p-phenylenediamine form hydrogen bonds with the hydroxyl, carboxyl, or amino groups in asphaltene, thus breaking up the aggregates formed by the planar overlap of asphaltene molecules and preventing asphaltene from stacking and depositing. Simultaneously, the 2,2,6,6-tetramethylpiperidinol nitroxide radical also acts as a polymerization inhibitor, preventing the polymerization and deposition of molecules in asphaltene. Secondly, in the first component, diene succinimide can also adsorb solid particles in asphaltene, causing insoluble substances to be in a colloidal suspension state, further loosening the overall structure of asphaltene and facilitating the dispersion of asphaltene by di-sec-butyl-p-phenylenediamine.

[0029] (2) By adding pyrrolidone and propylene glycol, this technical solution can, on the one hand, form hydrogen bonds with the active groups of asphaltene through the hydroxyl groups contained in both, thereby saturating the hydrogen bonds between the asphaltene molecules and preventing the asphaltene molecules from depositing due to their own hydrogen bonding. On the other hand, the lubricating effect of pyrrolidone and propylene glycol can, in conjunction with the dodecylbenzenesulfonic acid organic amine salt, enable the asphaltene to quickly fall off the metal surface and disperse in the device tank system.

[0030] (3) This technical solution adds a solubilizer, and the long chain structure of the solubilizer causes the asphalt molecules to extend longitudinally, forming a planar linear structure that is easy to comb, thus avoiding the formation of a three-dimensional stacked structure and preventing the asphalt from agglomerating and accumulating. Detailed Implementation

[0031] The present invention will be further illustrated below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in this technical field.

[0032] This invention provides a multi-component scale inhibitor, which includes a first component, a second component, and a third component;

[0033] The first component includes diene succinimide and di-sec-butyl-p-phenylenediamine;

[0034] The second component includes dodecylbenzenesulfonic acid organic amine salt;

[0035] The third component includes 2,2,6,6-tetramethylpiperidinol nitroxide radicals.

[0036] The above technical solution employs a three-component scale inhibitor system. Specifically, diene succinimide and di-sec-butyl-p-phenylenediamine are used as the first component. Since di-sec-butyl-p-phenylenediamine has excellent amine antioxidant properties, it can effectively prevent diene succinimide from being oxidized at high temperatures during storage, thus affecting the scale inhibition efficiency. The second component is dodecylbenzenesulfonic acid organic amine salt, and the third component is 2,2,6,6-tetramethylpiperidinol nitroxide radical.

[0037] Firstly, in practical applications, the carboxyl groups of asphaltenes in crude oil form stable coordination compounds with calcium ions in the crude oil. Simultaneously, asphaltenes adsorb certain solid particles from the crude oil, such as catalysts, resulting in a more stable and firm deposition of asphaltenes in equipment and instruments. When a multi-component scale inhibitor is added, the organic amine in the second component, dodecylbenzenesulfonic acid organic amine salt, can combine with the hydroxyl groups in the metal, allowing the dodecylbenzenesulfonic acid organic amine salt to firmly adhere to the metal surface and form a polar surface, preventing the adsorption and deposition of non-polar asphaltenes on the metal surface. Simultaneously, the negatively charged sulfonate ions in the second component, dodecylbenzenesulfonic acid organic amine salt, adsorb into the asphaltenes, giving the asphaltenes an overall negative charge. Due to the repulsion of like charges, the intermolecular gaps in the asphaltenes widen, thus facilitating the penetration of the 2,2,6,6-tetramethylpiperidinol nitroxide free radicals from the third component. In asphaltene molecules, diene succinimide and di-sec-butyl-p-phenylenediamine combine with calcium ions to form complexes, thereby disrupting the stable structure of asphaltene. This allows the diene succinimide and di-sec-butyl-p-phenylenediamine in the first component to better penetrate and disperse between the lamellar molecular layers of asphaltene. Furthermore, the amino groups of diene succinimide and di-sec-butyl-p-phenylenediamine form hydrogen bonds with the hydroxyl, carboxyl, or amino groups in asphaltene, thus breaking up the aggregates formed by the planar overlap of asphaltene molecules and preventing asphaltene from stacking and depositing. Simultaneously, the 2,2,6,6-tetramethylpiperidinol nitroxide radical also acts as a polymerization inhibitor, preventing the polymerization and deposition of molecules in asphaltene. Secondly, in the first component, diene succinimide can also adsorb solid particles in asphaltene, causing insoluble substances to be in a colloidal suspension state, further loosening the overall structure of asphaltene and facilitating the dispersion of asphaltene by di-sec-butyl-p-phenylenediamine.

[0038] Furthermore, the multi-component scale inhibitor comprises the following components in parts by weight:

[0039] 45-60 parts of component one, 20-30 parts of component two, and 0.5-2 parts of component three;

[0040] In the first component, the mass ratio of diene succinimide to di-sec-butyl-p-phenylenediamine is 1-2:1.

[0041] Furthermore, the second component of the multi-component scale inhibitor also includes a solvent; the solvent is selected from any one or a mixture of n-butanol, propanol, and 2-pentanol.

[0042] Furthermore, the second component of the multi-component scale inhibitor also includes 5-6% by mass of pyrrolidone, and propylene glycol by mass equal to that of pyrrolidone.

[0043] The above technical solution, by adding pyrrolidone and propylene glycol, can, on the one hand, form hydrogen bonds with the active groups of asphaltenes through the hydroxyl groups contained in both, thereby saturating the hydrogen bonds between the asphaltenes molecules and preventing the asphaltenes molecules from depositing due to their own hydrogen bonding. On the other hand, the lubricating effect of pyrrolidone and propylene glycol can, in conjunction with the dodecylbenzenesulfonic acid organic amine salt, enable the asphaltenes to quickly detach from the metal surface and disperse in the device tank system.

[0044] Furthermore, the pyrrolidone is selected from any one of N-methyl-2-pyrrolidone, γ-pyrrolidone, and α-pyrrolidone.

[0045] Furthermore, the first component of the multi-component scale inhibitor also includes a solubilizer at 8-9% of the mass of the first component.

[0046] The above technical solution adds a solubilizer, and the long chain structure of the solubilizer causes the asphaltenes molecules to extend longitudinally, forming an easily combinable planar linear structure, thus avoiding the formation of a three-dimensional stacking structure and preventing the asphaltenes from agglomerating and accumulating.

[0047] Furthermore, the solubilizer is selected from any one of polyoxyethylene lauryl ester, polyoxyethylene stearate, and polyoxyethylene palmitate.

[0048] The present invention also provides a method for preventing fouling during petrochemical production, the method comprising the following steps:

[0049] When using this product, the materials of the second and third components are added to the first component, stirred and mixed, and then fed into a heating box. After heating, the mixture is injected through a pipeline or sprayed through a nozzle into the petrochemical production unit for descaling.

[0050] Furthermore, the temperature of the heating chamber is 40-50℃; the time is 20-30 minutes.

[0051] Furthermore, the heating chamber also includes an antioxidant; the antioxidant is selected from any one of 3-hydroxy-2,4,6-trimethylpyridine, p-tert-butylphenol, and p-xylenol.

[0052] Beneficial effects: (1) This technical solution uses a three-component scale inhibitor system. Specifically, diene succinimide and di-sec-butyl-p-phenylenediamine are used as the first component. Since di-sec-butyl-p-phenylenediamine has excellent amine antioxidant properties, it can effectively prevent diene succinimide from being oxidized at high temperature during storage, thus affecting the scale inhibition efficiency. Dodecylbenzenesulfonic acid organic amine salt is used as the second component, and 2,2,6,6-tetramethylpiperidinol nitroxide free radical is used as the third component.

[0053] Firstly, in practical applications, the carboxyl groups of asphaltenes in crude oil form stable coordination compounds with calcium ions in the crude oil. Simultaneously, asphaltenes adsorb certain solid particles from the crude oil, such as catalysts, resulting in a more stable and firm deposition of asphaltenes in equipment and instruments. When a multi-component scale inhibitor is added, the organic amine in the second component, dodecylbenzenesulfonic acid organic amine salt, can combine with the hydroxyl groups in the metal, allowing the dodecylbenzenesulfonic acid organic amine salt to firmly adhere to the metal surface and form a polar surface, preventing the adsorption and deposition of non-polar asphaltenes on the metal surface. Simultaneously, the negatively charged sulfonate ions in the second component, dodecylbenzenesulfonic acid organic amine salt, adsorb into the asphaltenes, giving the asphaltenes an overall negative charge. Due to the repulsion of like charges, the intermolecular gaps in the asphaltenes widen, thus facilitating the penetration of the 2,2,6,6-tetramethylpiperidinol nitroxide free radicals from the third component. In asphaltene molecules, diene succinimide and di-sec-butyl-p-phenylenediamine combine with calcium ions to form complexes, thereby disrupting the stable structure of asphaltene. This allows the diene succinimide and di-sec-butyl-p-phenylenediamine in the first component to better penetrate and disperse between the lamellar molecular layers of asphaltene. Furthermore, the amino groups of diene succinimide and di-sec-butyl-p-phenylenediamine form hydrogen bonds with the hydroxyl, carboxyl, or amino groups in asphaltene, thus breaking up the aggregates formed by the planar overlap of asphaltene molecules and preventing asphaltene from stacking and depositing. Simultaneously, the 2,2,6,6-tetramethylpiperidinol nitroxide radical also acts as a polymerization inhibitor, preventing the polymerization and deposition of molecules in asphaltene. Secondly, in the first component, diene succinimide can also adsorb solid particles in asphaltene, causing insoluble substances to be in a colloidal suspension state, further loosening the overall structure of asphaltene and facilitating the dispersion of asphaltene by di-sec-butyl-p-phenylenediamine.

[0054] (2) By adding pyrrolidone and propylene glycol, this technical solution can, on the one hand, form hydrogen bonds with the active groups of asphaltene through the hydroxyl groups contained in both, thereby saturating the hydrogen bonds between the asphaltene molecules and preventing the asphaltene molecules from depositing due to their own hydrogen bonding. On the other hand, the lubricating effect of pyrrolidone and propylene glycol can, in conjunction with the dodecylbenzenesulfonic acid organic amine salt, enable the asphaltene to quickly fall off the metal surface and disperse in the device tank system.

[0055] (3) This technical solution adds a solubilizer, and the long chain structure of the solubilizer causes the asphalt molecules to extend longitudinally, forming a planar linear structure that is easy to comb, thus avoiding the formation of a three-dimensional stacked structure and preventing the asphalt from agglomerating and accumulating.

[0056] Unless otherwise specified, all reagents and materials used in the following examples are commercially available.

[0057] Example 1

[0058] Preparation of the first component:

[0059] Dienyl succinimide was added to di-sec-butyl-p-phenylenediamine and stirred at 100 rpm for 5 minutes. Then, a solubilizer was added, and stirring was continued for 10 minutes to obtain the first component. The mass of the solubilizer was 8.5% of the mass of the first component. The solubilizer was selected from polyoxyethylene lauryl ester. The mass ratio of dienyl succinimide to di-sec-butyl-p-phenylenediamine was 1.5:1.

[0060] Preparation of the second component:

[0061] Weigh out the following components by weight: 10 parts dodecylbenzenesulfonic acid organic amine salt and 30 parts solvent;

[0062] Dodecylbenzenesulfonic acid organic amine salt was added to a solvent and stirred at 100 rpm for 10 minutes. Then, pyrrolidone and propylene glycol were added, and stirring was continued for 5 minutes to obtain the second component. The mass of pyrrolidone was 5.5% of the mass of the second component. The pyrrolidone was selected from N-methyl-2-pyrrolidone. The mass of propylene glycol was equal to the mass of pyrrolidone. The solvent was selected from n-butanol. The dodecylbenzenesulfonic acid organic amine salt was selected from triethanolamine dodecylbenzenesulfonic acid.

[0063] Preparation of multi-component scale inhibitors:

[0064] Weigh out the following components in order of weight: 55 parts of component one, 25 parts of component two, and 1.3 parts of component three.

[0065] When needed, add the second and third components to the first component and stir with a stirrer at 300 r / min for 10 min to obtain a multi-component scale inhibitor; the third component is 2,2,6,6-tetramethylpiperidinol nitroxide free radical;

[0066] Descaling methods in petrochemical production:

[0067] The multi-component scale inhibitor and antioxidant prepared above are fed into a heating chamber, heated, and then injected through a pipeline into the heat exchanger at the bottom of the vacuum tower for descaling. The temperature of the heating chamber is 45°C and the time is 25 min. The antioxidant is selected from 3-hydroxy-2,4,6-trimethylpyridine.

[0068] Example 2

[0069] Preparation of the first component:

[0070] Dienyl succinimide was added to di-sec-butyl-p-phenylenediamine and stirred at 100 rpm for 5 minutes. Then, a solubilizer was added, and stirring was continued for 10 minutes to obtain the first component. The mass of the solubilizer was 8% of the mass of the first component. The solubilizer was selected from polyoxyethylene stearate. The mass ratio of dienyl succinimide to di-sec-butyl-p-phenylenediamine was 1:1.

[0071] Preparation of the second component:

[0072] Weigh out the following components by weight: 10 parts dodecylbenzenesulfonic acid organic amine salt and 30 parts solvent;

[0073] Dodecylbenzenesulfonic acid organic amine salt is added to a solvent and stirred at 100 rpm for 10 minutes. Then, pyrrolidone and propylene glycol are added, and stirring is continued for 5 minutes to obtain the second component. The mass of pyrrolidone is 5% of the mass of the second component. The pyrrolidone is selected from γ-pyrrolidone. The mass of propylene glycol is equal to the mass of pyrrolidone. The solvent is selected from propanol. The dodecylbenzenesulfonic acid organic amine salt is selected from isopropylamine dodecylbenzenesulfonic acid.

[0074] Preparation of multi-component scale inhibitors:

[0075] Weigh out the following components in order of weight: 45 parts of component one, 20 parts of component two, and 0.5 parts of component three.

[0076] When needed, add the second and third components to the first component and stir with a stirrer at 300 r / min for 10 min to obtain a multi-component scale inhibitor; the third component is 2,2,6,6-tetramethylpiperidinol nitroxide free radical;

[0077] Descaling methods in petrochemical production:

[0078] The multi-component scale inhibitor and antioxidant prepared above are fed into a heating chamber, heated, and then injected through a pipeline into the heat exchanger at the bottom of the vacuum tower for descaling; the temperature of the heating chamber is 40°C and the time is 20 min; the antioxidant is selected from p-tert-butylphenol.

[0079] Example 3

[0080] Preparation of the first component:

[0081] Dienyl succinimide was added to di-sec-butyl-p-phenylenediamine and stirred at 100 rpm for 5 minutes. Then, a solubilizer was added, and stirring was continued for 10 minutes to obtain the first component. The mass of the solubilizer was 9% of the mass of the first component. The solubilizer was selected from polyoxyethylene palmitate. The mass ratio of dienyl succinimide to di-sec-butyl-p-phenylenediamine was 2:1.

[0082] Preparation of the second component:

[0083] Weigh out the following components by weight: 10 parts dodecylbenzenesulfonic acid organic amine salt and 30 parts solvent;

[0084] Dodecylbenzenesulfonic acid organic amine salt is added to a solvent and stirred at 100 rpm for 10 minutes. Then, pyrrolidone and propylene glycol are added, and stirring is continued for 5 minutes to obtain the second component. The mass of pyrrolidone is 6% of the mass of the second component. The pyrrolidone is selected from α-pyrrolidone. The mass of propylene glycol is equal to the mass of pyrrolidone. The solvent is selected from 2-pentanol. The dodecylbenzenesulfonic acid organic amine salt is selected from dodecylbenzenesulfonic acid ethanolamine.

[0085] Preparation of multi-component scale inhibitors:

[0086] Weigh out the following components in order of weight: 60 parts of component one, 30 parts of component two, and 2 parts of component three;

[0087] When needed, add the second and third components to the first component and stir with a stirrer at 300 r / min for 10 min to obtain a multi-component scale inhibitor; the third component is 2,2,6,6-tetramethylpiperidinol nitroxide free radical;

[0088] Descaling methods in petrochemical production:

[0089] The multi-component scale inhibitor and antioxidant prepared above are fed into a heating chamber, heated, and then injected through a pipeline into the heat exchanger at the bottom of the vacuum tower for descaling. The temperature of the heating chamber is 50°C and the time is 30 minutes. The antioxidant is selected from p-xylenol.

[0090] Example 4

[0091] The difference between this embodiment and Example 1 is that pyrrolidone was not added to the second component, while the other conditions remained the same.

[0092] Example 5

[0093] The difference between this embodiment and Example 1 is that propylene glycol was not added to the second component, while the other conditions remained the same.

[0094] Example 6

[0095] The difference between this embodiment and Example 1 is that no solubilizer was added to the first component, while the other conditions remained the same.

[0096] Comparative Example 1

[0097] The difference between this comparative example and Example 1 is that diene succinimide was not added to the first component, while the other conditions remained the same.

[0098] Comparative Example 2

[0099] The difference between this comparative example and Example 1 is that di-sec-butyl-p-phenylenediamine was not added to the first component, while the other conditions remained the same.

[0100] Comparative Example 3

[0101] The difference between this comparative example and Example 1 is that the first component was not added, while the other conditions remained the same.

[0102] Comparative Example 4

[0103] The difference between this comparative example and Example 1 is that no second component was added, while all other conditions remained the same.

[0104] Comparative Example 5

[0105] The difference between this comparative example and Example 1 is that no third component was added, while all other conditions remained the same.

[0106] The products obtained in Examples 1-6 and Comparative Examples 1-5 were subjected to performance tests. The specific test methods and results are as follows:

[0107] The petrochemical plant used in this experiment is a heat exchanger at the bottom of a vacuum distillation tower.

[0108] Comparative experiment: The products obtained in the above examples and comparative examples were not added to the heat exchanger at the bottom of the pressure reducing tower. The device operated normally for 12 hours, and then the scale sample (mainly asphaltene) was taken out from the device. The mass of the scale sample (mainly asphaltene) was m1.

[0109] Scale inhibition effect test: The multi-component scale inhibitor prepared above was introduced into a heating box and kept at a constant temperature of 40℃. Then it was injected into the heat exchanger at the bottom of the pressure reducing tower through a pipeline. The device was run normally for 12 hours. Then the scale sample (mainly asphaltene) was taken out of the device and the mass of the scale sample (mainly asphaltene) was measured as m2.

[0110] Scale inhibition rate = ((m1-m2) / m1)×100%; the higher the scale inhibition rate, the better the scale inhibition effect.

[0111] The specific test results are shown in Table 1;

[0112] Table 1: Product Performance Test Results

[0113] Scale inhibition rate / % Example 1 99.36％ Example 2 98.63％ Example 3 98.66％ Example 4 98.68％ Example 5 85.59％ Example 6 76.90％ Comparative Example 1 70.96％ Comparative Example 2 79.67％ Comparative Example 3 68.89％ Comparative Example 4 66.89％ Comparative Example 5 66.12％

[0114] As can be seen from the test results in Table 1, the product obtained by this invention has a good scale inhibition effect.

[0115] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A multi-component scale inhibitor, characterized in that, The multi-component scale inhibitor comprises 45-60 parts of component one, 20-30 parts of component two, and 0.5-2 parts of component three. The first component comprises diene succinimide, di-sec-butyl-p-phenylenediamine, and a solubilizer; the mass of the solubilizer is 8-9% of the total mass of the first component. The second component comprises dodecylbenzenesulfonic acid organic amine salt, pyrrolidone, and propylene glycol; the mass of the pyrrolidone is 5-6% of the total mass of the second component, and the mass of the propylene glycol is equal to the mass of the pyrrolidone; The third component includes 2,2,6,6-tetramethylpiperidinol nitroxide radicals.

2. The multi-component scale inhibitor according to claim 1, characterized in that, The mass ratio of diene succinimide to di-sec-butyl-p-phenylenediamine in the first component is 1-2:

1.

3. The multi-component scale inhibitor according to claim 1, characterized in that, The second component of the multi-component scale inhibitor also includes a solvent; the solvent is selected from any one or a mixture of n-butanol, propanol, and 2-pentanol.

4. The multi-component scale inhibitor according to claim 1, characterized in that, Pyrrolidone is selected from any one of N-methyl-2-pyrrolidone, γ-pyrrolidone, and α-pyrrolidone.

5. The multi-component scale inhibitor according to claim 1, characterized in that, The solubilizer is selected from any one of polyoxyethylene lauryl ester, polyoxyethylene stearate, and polyoxyethylene palmitate.

6. A method for preventing fouling during petrochemical production, characterized in that, The method using the multi-component scale inhibitor according to any one of claims 1-5 comprises the following steps: The materials of the second and third components are added to the first component, stirred and mixed, and then fed into a heating box. After heating, the mixture is injected through a pipeline or sprayed through a nozzle into the petrochemical production unit for descaling.

7. The method for preventing fouling in petrochemical production according to claim 6, characterized in that, The temperature of the heating chamber is 40-50℃; the time is 20-30 minutes.

8. The method for preventing fouling in petrochemical production according to claim 6, characterized in that, The heating chamber also includes an antioxidant; the antioxidant is selected from any one of 3-hydroxy-2,4,6-trimethylpyridine, p-tert-butylphenol, and p-xylenol.