Environment-friendly crude oil pour point depressant as well as preparation method and application thereof

Abstract

The present application belongs to the technical field of biomass energy additive, and particularly relates to an environment-friendly crude oil pour point depressant as well as a preparation method and application thereof. The crude oil pour point depressant product is based on a fumaric acid high-carbon alcohol ester polymer formed by esterification of fumaric acid and a high-carbon alcohol ester, and the performance is optimized by mixing and adding a polymer formed by radical polymerization of glycidyl methacrylate and norbornene dicarboxylic anhydride. The two are mixed to form the required crude oil pour point depressant. The synergistic effect of the glycidyl methacrylate-norbornene dicarboxylic anhydride polymer on the fumaric acid high-carbon alcohol ester polymer can effectively improve the freezing point, cold filter plugging point and viscosity of the crude oil product, and further enhance the low-temperature conveying and application performance thereof.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of biomass energy additive, and particularly relates to an environment-friendly crude oil pour point depressant as well as a preparation method and application thereof. BACKGROUND

[0002] Energy is a necessity for human survival and development, and oil, which is processed from crude oil, is an important part of human production and life. Therefore, the exploitation, transportation and storage of crude oil are particularly important. However, the high content of waxy in crude oil can cause high freezing point and large viscosity, and ultimately cause the crude oil to lose fluidity and solidify on the pipe wall, thereby causing problems such as difficult oil extraction, low efficiency, difficult transportation and the like, which brings great difficulties to the exploitation and transportation of crude oil.

[0003] As a commonly used chemical additive, the pour point depressant is widely used in the process of crude oil exploitation and transportation, and can effectively improve the fluidity of crude oil and reduce the transportation cost and risk of crude oil. Commonly used crude oil pour point depressants mainly include ethylene-vinyl acetate copolymer, styrene-maleic anhydride copolymer and acrylate polymer, etc. The addition of these pour point depressants can effectively improve the low-temperature flow performance of crude oil. However, the common defects of many currently used crude oil pour point depressants are that they cannot be quickly and effectively dispersed in crude oil under the premise of ensuring efficiency, resulting in a still high dosage and affecting the environmental performance. The field expects to develop more crude oil pour point depressant products with stronger adaptability and better pour point depression effect. SUMMARY

[0004] Therefore, the purpose of the present application is to provide an environment-friendly crude oil pour point depressant, which has better pour point depression effect and application performance.

[0005] The second purpose of the present application is to provide a preparation method and application of the environment-friendly crude oil pour point depressant.

[0006] To solve the above technical problems, the environment-friendly crude oil pour point depressant provided by the present application comprises a mixture of a first polymer and a second polymer, wherein,

[0007] The first polymer is a high-carbon alcohol fumarate obtained by esterification reaction of high-carbon alcohol and fumaric acid.

[0008] The second polymer is a methacrylate-norbornene dicarboxylic anhydride polymer obtained by polymerization reaction of methacrylate and norbornene dicarboxylic anhydride.

[0009] Specifically, the mass ratio of the first polymer and the second polymer in the environment-friendly crude oil pour point depressant is 1-3:1.

[0010] Specifically, the mass ratio of the first polymer and the second polymer in the environment-friendly crude oil pour point depressant is 1-2:1.

[0011] Specifically, in the environmentally-friendly crude oil pour point depressant, the high carbon alcohol in the first polymer comprises a mixture of C20, C22 and C24 fatty alcohols.

[0012] Specifically, in the environmentally-friendly crude oil pour point depressant, the methacrylate in the second polymer comprises glycidyl methacrylate.

[0013] The application further discloses a preparation method of the environmentally-friendly crude oil pour point depressant, which comprises the step of mixing the first polymer and the second polymer.

[0014] Specifically, the preparation method of the environmentally-friendly crude oil pour point depressant further comprises the step of preparing the first polymer, and specifically comprises the step of esterifying the high carbon alcohol with fumaric acid in the presence of an esterification catalyst and a polymerization inhibitor.

[0015] Specifically, in the preparation method of the environmentally-friendly crude oil pour point depressant, the preparation step of the first polymer comprises:

[0016] the molar ratio of the high carbon alcohol and fumaric acid is 2-3:1; and / or,

[0017] the catalyst comprises p-toluenesulfonic acid; and / or,

[0018] the catalyst is used in an amount of 1-2 wt% of the total mass of the high carbon alcohol and fumaric acid; and / or,

[0019] the polymerization inhibitor comprises hydroquinone; and / or,

[0020] the polymerization inhibitor is used in an amount of 0.5-0.8 wt% of the total mass of the high carbon alcohol and fumaric acid; and / or,

[0021] the esterification reaction is carried out at a temperature of 120-140 DEG C; and / or,

[0022] the esterification reaction is carried out for 4-6 hours.

[0023] Specifically, the preparation method of the environmentally-friendly crude oil pour point depressant further comprises the step of preparing the second polymer, and specifically comprises the step of polymerizing the methacrylate with norbornene dicarboxylic anhydride in the presence of an initiator.

[0024] Specifically, in the preparation method of the environmentally-friendly crude oil pour point depressant, the preparation step of the second polymer comprises:

[0025] the molar ratio of the methacrylate and norbornene dicarboxylic anhydride is 1-5:1; and / or,

[0026] The initiator comprises benzoyl peroxide; and / or,

[0027] The amount of the initiator is 0.5-1.5wt% of the total mass of the methacrylate and norbornene dicarboxylic anhydride; and / or,

[0028] The temperature of the polymerization reaction is 100-120℃; and / or,

[0029] The time of the polymerization reaction is 3-6h.

[0030] The application further discloses application of the environment-friendly crude oil pour point depressant or the environment-friendly crude oil pour point depressant prepared by the method in the field of crude oil pour point depression.

[0031] Specifically, the addition amount of the crude oil pour point depressant based on the crude oil is ≥200ppm, preferably 200-500ppm.

[0032] The crude oil pour point depressant product in the application is based on a fumaric acid high-carbon alcohol ester polymer formed by esterification of fumaric acid and a high-carbon alcohol ester, and the performance is optimized by mixing and adding a polymer formed by radical polymerization of glycidyl methacrylate and norbornene dicarboxylic anhydride, the two are mixed to form the required crude oil pour point depressant, and the synergistic effect of the glycidyl methacrylate-norbornene dicarboxylic anhydride polymer on the fumaric acid high-carbon alcohol ester polymer can effectively improve the pour point, cold filter plugging point and viscosity of the crude oil product, and further enhance its low-temperature transportability and low-temperature application performance. DETAILED DESCRIPTION

[0033] In order to solve the application and effect limitation of the crude oil pour point depressant product, the application provides an environment-friendly crude oil pour point depressant, which comprises a mixture of a first polymer and a second polymer; wherein,

[0034] The first polymer is a fumaric acid high-carbon alcohol ester obtained by esterification of high-carbon alcohol and fumaric acid.

[0035] The second polymer is a methacrylate-norbornene dicarboxylic anhydride polymer obtained by polymerization of methacrylate and norbornene dicarboxylic anhydride.

[0036] In some specific embodiments, the mass ratio of the first polymer and the second polymer is 1-3:1.

[0037] In some specific embodiments, the mass ratio of the first polymer and the second polymer is 1-2:1.

[0038] In some specific embodiments, the mass ratio of the first polymer and the second polymer is 2:1.

[0039] In some embodiments, the high carbon alcohol in the first polymer comprises a mixture of C20, C22 and C24 fatty alcohols. The high carbon alcohol can be selected from commercially available products, and the mass ratio of the C20, C22 and C24 fatty alcohols is preferably 1-2:1-2:1-2; in some embodiments, the mass ratio of the C20, C22 and C24 fatty alcohols is preferably 1:1:1, and a normal mixture can be used.

[0040] In some embodiments, the methacrylate in the second polymer comprises glycidyl methacrylate.

[0041] The present application also discloses a preparation method of the environmentally friendly crude oil pour point depressant as described in the above embodiments, which comprises the step of mixing the first polymer and the second polymer.

[0042] In some embodiments, the method further comprises the step of preparing the first polymer, which specifically comprises the step of esterifying the high carbon alcohol with fumaric acid in the presence of an esterification catalyst and a polymerization inhibitor.

[0043] In some embodiments, the step of preparing the first polymer comprises:

[0044] the molar ratio of the high carbon alcohol to fumaric acid is 2-3:1; and / or,

[0045] the catalyst comprises p-toluenesulfonic acid; and / or,

[0046] the amount of the catalyst is 1-2 wt% of the total mass of the high carbon alcohol and fumaric acid; and / or,

[0047] the polymerization inhibitor comprises hydroquinone; and / or,

[0048] the amount of the polymerization inhibitor is 0.5-0.8 wt% of the total mass of the high carbon alcohol and fumaric acid; and / or,

[0049] the temperature of the esterification reaction is 120-140°C; and / or,

[0050] the time of the esterification reaction is 4-6 h.

[0051] In some embodiments, the method further comprises the step of preparing the second polymer, which specifically comprises the step of polymerizing the methacrylate with norbornene dicarboxylic anhydride in the presence of an initiator.

[0052] In some embodiments, the step of preparing the second polymer comprises:

[0053] the molar ratio of the methacrylate and norbornene dicarboxylic anhydride is 1-5:1; and / or,

[0054] the initiator comprises benzoyl peroxide; and / or,

[0055] the amount of the initiator is 0.5-1.5wt% of the total mass of the methacrylate and norbornene dicarboxylic anhydride; and / or,

[0056] the temperature of the polymerization reaction is 100-120℃; and / or,

[0057] the time of the polymerization reaction is 3-6h.

[0058] Embodiment 1

[0059] The environmentally friendly crude oil pour point depressant comprises a mixture of a first polymer and a second polymer in a mass ratio of 2:1.

[0060] The preparation method of the first polymer comprises: taking high carbon alcohol (C20:C22:C24=1:1:1) as raw material and adding to a three-necked flask equipped with a condenser, a water separator, and a magnetic stirring device, and adding toluene as solvent and p-toluenesulfonic acid catalyst and hydroquinone polymerization inhibitor for sufficient mixing; wherein the amount of the catalyst accounts for 1.5% of the total mass of the high carbon alcohol and fumaric acid, and the amount of the polymerization inhibitor accounts for 0.6% of the total mass of the high carbon alcohol and fumaric acid; the above raw materials are heated and dissolved sufficiently, and fumaric acid raw material is continuously added for mixing, wherein the molar ratio of the high carbon alcohol to the fumaric acid is 2:1; the reaction system is heated to 140℃ for sufficient reaction for 5h; after the reaction is completed, the product is subjected to reduced pressure distillation to remove toluene, and then washed with 5%, 60℃ NaOH solution to remove excess p-toluenesulfonic acid and fumaric acid until the liquid shows weak alkaline, and washed with water at 80℃ hot distilled water until neutral, and vacuum dried at 60℃ for 5h to prepare fumaric acid high carbon alcohol ester.

[0061] The preparation method of the second polymer comprises the following steps: glycidyl methacrylate and norbornene dicarboxylic anhydride are taken in a reaction container in a molar ratio of 3:1, and a sufficient amount of toluene solvent is added for mixing; the reaction system is heated to dissolve all the reactants, and vacuumizing and nitrogen filling are performed on the reaction container to remove air in the reaction system and form a protective atmosphere; when the temperature of the reaction system reaches 120 DEG C, a proper amount of toluene solution containing benzoyl peroxide is slowly added dropwise, and the amount of the benzoyl peroxide is 1wt% of the total mass of the methacrylate and norbornene dicarboxylic anhydride; the polymerization reaction is performed under stirring and reflux for 5h under the action of the initiator; after the reaction is completed and the reaction system is cooled to room temperature, excess ethanol is continuously added dropwise, the upper clear liquid is removed through solid-liquid separation, the lower white precipitate is collected, and the benzoyl peroxide in the system is removed and then dried to obtain the methacrylate-norbornene dicarboxylic anhydride polymer.

[0062] The first polymer and the second polymer are mixed to obtain the required crude oil pour point depressant.

[0063] Example 2

[0064] The environmentally-friendly crude oil pour point depressant comprises a mixture of the first polymer and the second polymer in a mass ratio of 1:1.

[0065] The preparation method of the first polymer comprises the following steps: high carbon alcohol (C20:C22:C24=1:2:1) is taken as raw material and added into a three-necked flask provided with a condenser, a water separator and a magnetic stirring device, toluene is added as a solvent, and p-toluene sulfonic acid catalyst and hydroquinone polymerization inhibitor are fully mixed; the amount of the catalyst accounts for 1% of the total mass of the high carbon alcohol and fumaric acid, and the amount of the polymerization inhibitor accounts for 0.5% of the total mass of the high carbon alcohol and fumaric acid; the above raw materials are heated to be fully dissolved, and fumaric acid raw material is continuously added, and the molar ratio of the high carbon alcohol to the fumaric acid is 3:1; the reaction system is heated to 120 DEG C for fully reacting for 5h; after the reaction is completed, the product is subjected to vacuum distillation to remove toluene, and then washed with 5% NaOH solution at 60 DEG C to remove excess p-toluene sulfonic acid and fumaric acid until the liquid shows weak alkalinity, and then washed with hot distilled water at 80 DEG C until neutral, and finally dried at 60 DEG C under vacuum for 5h to obtain the high carbon alcohol fumarate.

[0066] The preparation method of the second polymer comprises the following steps: glycidyl methacrylate and norbornene dicarboxylic anhydride are taken in a reaction container in a molar ratio of 1:1, and a sufficient amount of toluene solvent is added for mixing; the reaction system is heated to dissolve all the reactants, and vacuumizing and nitrogen filling are performed on the reaction container to remove air in the reaction system and form a protective atmosphere; when the temperature of the reaction system reaches 100℃, a proper amount of toluene solution containing benzoyl peroxide is slowly added dropwise, and the amount of the benzoyl peroxide is 0.5wt% of the total mass of the methacrylate and norbornene dicarboxylic anhydride; the polymerization reaction is performed under stirring and reflux for 5h under the action of the initiator; after the reaction is completed and the reaction system is cooled to room temperature, excess ethanol is continuously added dropwise, the upper clear liquid is removed through solid-liquid separation, and the lower white precipitate is collected; after the benzoyl peroxide in the system is removed, drying treatment is performed, and thus the methacrylate-norbornene dicarboxylic anhydride polymer is obtained.

[0067] The first polymer and the second polymer are mixed to obtain the required crude oil pour point depressant.

[0068] Example 3

[0069] The environmentally friendly crude oil pour point depressant comprises a mixture of the first polymer and the second polymer in a mass ratio of 3:1.

[0070] The preparation method of the first polymer comprises the following steps: high carbon alcohol (C20:C22:C24=2:1:1) is taken as raw material and added into a three-necked flask provided with a condenser, a water separator and a magnetic stirring device, toluene is added as a solvent, and p-toluene sulfonic acid catalyst and hydroquinone polymerization inhibitor are fully mixed; the amount of the catalyst accounts for 2% of the total mass of the high carbon alcohol and fumaric acid, and the amount of the polymerization inhibitor accounts for 0.8% of the total mass of the high carbon alcohol and fumaric acid; the above raw materials are heated to be fully dissolved, and fumaric acid raw material is continuously added, wherein the molar ratio of the high carbon alcohol to the fumaric acid is 3:1; the reaction system is heated to 130℃ for fully reacting for 5h; after the reaction is completed, the product is subjected to vacuum distillation to remove toluene, and then washed with 5% NaOH solution at 60℃ to remove excess p-toluene sulfonic acid and fumaric acid until the liquid shows weak alkalinity, and then washed with hot distilled water at 80℃ until neutral, and finally dried at 60℃ under vacuum for 5h, so as to obtain fumaric acid high carbon alcohol ester.

[0071] The preparation method of the second polymer comprises the following steps: glycidyl methacrylate and norbornene dicarboxylic anhydride are taken in a molar ratio of 5:1 and added into a reaction container, and a sufficient amount of toluene solvent is added for mixing; the reaction system is heated to dissolve all the reactants, and the reaction container is subjected to vacuum extraction and nitrogen gas is introduced to remove air in the reaction system, so as to form a protective atmosphere; when the temperature is increased to 110℃, a proper amount of toluene solution containing benzoyl peroxide is slowly added dropwise, and the amount of the benzoyl peroxide is 1.5wt% of the total mass of the methacrylate and norbornene dicarboxylic anhydride; the polymerization reaction is carried out under stirring and reflux for 5h under the action of the initiator; after the reaction is completed and the reaction system is cooled to room temperature, excess ethanol is continuously added dropwise, the upper clear liquid is removed through solid-liquid separation, the lower white precipitate is collected, and the benzoyl peroxide in the system is removed and then dried, so as to obtain the methacrylate-norbornene dicarboxylic anhydride polymer.

[0072] The first polymer and the second polymer are mixed to obtain the required crude oil pour point depressant.

[0073] Example 4

[0074] The environmentally friendly crude oil pour point depressant comprises a mixture of the first polymer and the second polymer in a mass ratio of 2:1.

[0075] The preparation method of the first polymer comprises the following steps: high carbon alcohol (C20:C22:C24=1:2:1) is taken as raw material and added into a three-necked flask provided with a condenser, a water separator and a magnetic stirring device, toluene is added as a solvent, and p-toluene sulfonic acid catalyst and hydroquinone polymerization inhibitor are fully mixed; the amount of the catalyst accounts for 1% of the total mass of the high carbon alcohol and fumaric acid, and the amount of the polymerization inhibitor accounts for 0.5% of the total mass of the high carbon alcohol and fumaric acid; the above raw materials are fully dissolved by heating, and fumaric acid raw material is continuously added for mixing, wherein the molar ratio of the high carbon alcohol to the fumaric acid is 3:1; the reaction system is heated to 120℃ for fully reacting for 5h; after the reaction is completed, the product is subjected to vacuum distillation to remove toluene, and then washed with 5% NaOH solution at 60℃ to remove excess p-toluene sulfonic acid and fumaric acid until the liquid shows weak alkalinity, and then washed with hot distilled water at 80℃ until neutral, and finally dried at 60℃ under vacuum for 5h, so as to obtain the high carbon alcohol fumarate.

[0076] The preparation method of the second polymer comprises the following steps: glycidyl methacrylate and norbornene dicarboxylic anhydride are taken in a reaction container in a molar ratio of 1:1, and a sufficient amount of toluene solvent is added for mixing; the reaction system is heated to dissolve all the reactants, and vacuumizing and nitrogen filling are performed on the reaction container to remove air in the reaction system and form a protective atmosphere; when the temperature of the reaction system reaches 100℃, a proper amount of toluene solution containing benzoyl peroxide is slowly added dropwise, and the amount of the benzoyl peroxide is 0.5wt% of the total mass of the methacrylate and norbornene dicarboxylic anhydride; the polymerization reaction is performed under stirring and reflux for 5h under the action of the initiator; after the reaction is completed and the reaction system is cooled to room temperature, excess ethanol is continuously added dropwise, the upper clear liquid is removed through solid-liquid separation, and the lower white precipitate is collected; after the benzoyl peroxide in the system is removed, drying treatment is performed, and thus the methacrylate-norbornene dicarboxylic anhydride polymer is obtained.

[0077] The first polymer and the second polymer are mixed to obtain the required crude oil pour point depressant.

[0078] Example 5

[0079] The environmentally friendly crude oil pour point depressant comprises a mixture of the first polymer and the second polymer in a mass ratio of 2:1.

[0080] The preparation method of the first polymer comprises the following steps: high carbon alcohol (C20:C22:C24=2:1:1) is taken as raw material and added into a three-necked flask provided with a condenser, a water separator and a magnetic stirring device, toluene is added as a solvent, and p-toluene sulfonic acid catalyst and hydroquinone polymerization inhibitor are fully mixed; the amount of the catalyst accounts for 2% of the total mass of the high carbon alcohol and fumaric acid, and the amount of the polymerization inhibitor accounts for 0.8% of the total mass of the high carbon alcohol and fumaric acid; the above raw materials are heated to be fully dissolved, and fumaric acid raw material is continuously added, wherein the molar ratio of the high carbon alcohol to the fumaric acid is 3:1; the reaction system is heated to 130℃ for fully reacting for 5h; after the reaction is completed, the product is subjected to vacuum distillation to remove toluene, and then washed with 5% NaOH solution at 60℃ to remove excess p-toluene sulfonic acid and fumaric acid until the liquid shows weak alkalinity, and then washed with hot distilled water at 80℃ until neutral, and finally dried at 60℃ under vacuum for 5h, so as to obtain fumaric acid high carbon alcohol ester.

[0081] The preparation method of the second polymer comprises the following steps: glycidyl methacrylate and norbornene dicarboxylic anhydride are taken into a reaction container in a molar ratio of 5:1, and a sufficient amount of toluene solvent is added for mixing; the reaction system is heated to dissolve all the reactants, and the reaction container is subjected to vacuum treatment and nitrogen is introduced to remove air in the reaction system to form a protective atmosphere; when the temperature is increased to 110°C, a proper amount of toluene solution containing benzoyl peroxide is slowly added dropwise, and the amount of the benzoyl peroxide is 1.5wt% of the total mass of the methacrylate and norbornene dicarboxylic anhydride; the polymerization reaction is carried out under stirring and reflux for 5h under the action of the initiator; after the reaction is collected and cooled to room temperature, excess ethanol is continuously added dropwise, the supernatant is removed by solid-liquid separation, the white precipitate is collected, and the benzoyl peroxide in the system is removed and dried to obtain the methacrylate-norbornene dicarboxylic anhydride polymer.

[0082] The first polymer and the second polymer are mixed to obtain the required crude oil pour point depressant.

[0083] Comparative Example 1

[0084] The composition and preparation method of the crude oil pour point depressant in the present comparative example are the same as those in Example 1, and the only difference is that the crude oil pour point depressant only comprises the first polymer.

[0085] Comparative Example 2

[0086] The composition and preparation method of the crude oil pour point depressant in the present comparative example are the same as those in Example 1, and the only difference is that the crude oil pour point depressant only comprises the second polymer.

[0087] Comparative Example 3

[0088] The composition and preparation method of the crude oil pour point depressant in the present comparative example are the same as those in Example 1, and the only difference is that in the second polymer, the methacrylate is selected as stearyl methacrylate.

[0089] Comparative Example 4

[0090] The composition and preparation method of the crude oil pour point depressant in the present comparative example are the same as those in Example 1, and the only difference is that in the second polymer, the methacrylate is selected as isobornyl methacrylate.

[0091] Experimental Example

[0092] In the present experimental example, the crude oil sample product of Panjin Oilfield is selected for testing to verify the effect of the crude oil pour point depressant.

[0093] The crude oil depressant prepared in the above Example 1 and Comparative Examples 1-4 was mixed with selected crude oil samples, respectively, at a ratio of 200-500 ppm to obtain test samples, and the change in freezing point and the change in viscosity (20℃) were tested, respectively, and the results are shown in Table 1 below.

[0094] In the present experimental example, the freezing point of crude oil was determined by SY / T 0541-2009 method, and the viscosity of crude oil was determined by the balance method of rotary viscometer SY / T 0520-2008, and the results are shown in Table 1 below. Among them, ΔSP represents the freezing point reduction range of crude oil relative to the initial crude oil sample after adding the crude oil depressant of the present application; the viscosity reduction rate represents the reduction percentage of the viscosity value relative to the initial crude oil sample.

[0095] Table 1

[0096]

[0097] As can be seen, the crude oil depressant product of the present application is based on the traditional fumaric acid high carbon alcohol ester with certain condensation effect, and the performance is optimized by adding methacrylate-norbornene dicarboxylic anhydride polymer. As can be seen from the data in Table 1, although the glycidyl methacrylate-norbornene dicarboxylic anhydride polymer selected by the present application has not outstanding condensation point and viscosity reduction effect when used alone, it can assist the condensation effect of fumaric acid high carbon alcohol ester, and under the synergistic effect of the two, not only effectively improves the freezing point and viscosity of the crude oil product, further enhances its low temperature application performance, and the use amount of the crude oil depressant is low, and the environmental performance is better.

[0098] Obviously, the above examples are only examples for clearly illustrating, and not limit the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An environmentally friendly pour point depressant for crude oil, characterized by comprising: The crude oil pour point depressant comprises a mixture of a first polymer and a second polymer in a mass ratio of 1-3:1; wherein, The first polymer is a high carbon alcohol fumarate obtained by esterification of high carbon alcohol and fumaric acid; The second polymer is a methacrylate-norbornene dicarboxylic anhydride polymer obtained by polymerization of methacrylate and norbornene dicarboxylic anhydride; In the first polymer, the high carbon alcohol is a mixture of C20, C22 and C24 fatty alcohols; In the second polymer, the methacrylate is glycidyl methacrylate.

2. The method for preparing the environment-friendly pour point depressant for crude oil according to claim 1, characterized in that, The method further comprises the step of mixing the first polymer and the second polymer.

3. The method according to claim 2, wherein the method is characterized by, The method further comprises the step of preparing the first polymer, specifically comprising the step of esterification of the high carbon alcohol and fumaric acid in the presence of an esterification catalyst and a polymerization inhibitor.

4. The method according to claim 3, wherein the method is characterized by, In the step of preparing the first polymer: The molar ratio of the high carbon alcohol and fumaric acid is 2-3:1; and / or, The catalyst comprises p-toluenesulfonic acid; and / or, The amount of the catalyst is 1-2wt% of the total mass of the high carbon alcohol and fumaric acid; and / or, The polymerization inhibitor comprises hydroquinone; and / or, The amount of the polymerization inhibitor is 0.5-0.8wt% of the total mass of the high carbon alcohol and fumaric acid; and / or, The temperature of the esterification reaction is 120-140℃; and / or, The time of the esterification reaction is 4-6h.

5. The method for preparing the environment-friendly pour point depressant for crude oil according to claim 2, characterized in that, The method further comprises the step of preparing the second polymer, specifically comprising the step of polymerization of the methacrylate and norbornene dicarboxylic anhydride in the presence of an initiator.

6. The method for preparing the environment-friendly crude oil pour point depressant according to claim 5, characterized in that, In the step of preparing the second polymer: The molar ratio of the methacrylate and norbornene dicarboxylic anhydride is 1-5:1; and / or, The initiator comprises benzoyl peroxide; and / or, The amount of the initiator is 0.5-1.5wt% of the total mass of the methacrylate and norbornene dicarboxylic anhydride; and / or, The temperature of the polymerization reaction is 100-120℃; and / or, The time of the polymerization reaction is 3-6h.

7. Use of the environmentally friendly crude oil pour point depressant of claim 1 or the environmentally friendly crude oil pour point depressant prepared by the method of any one of claims 2-6 in the field of crude oil pour point depression.

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