Fishbone-shaped cardanol derivative polymer demulsifier and preparation method thereof

Abstract

The invention provides a fishbone-shaped cardanol derivative polymer demulsifier and a preparation method thereof, the demulsifier is obtained by connecting hydrophilic monofunctional polyether amine to polycardanol glycidyl ether, the structural general formula of the demulsifier is shown in the specification, m is an integer between 1 and 1000, R is an EO / PO copolymer, x is more than or equal to 0 and less than or equal to 100, x + y is more than 10, y / x is more than 4, R1 is C15H31-n, and n is equal to 0, 2, 4 or 6. The fishbone-shaped cardanol derivative polymer demulsifier can be suitable for demulsification of different types of water-in-oil emulsions, the demulsification efficiency is high, and the preparation method is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum extraction and oilfield processing, and in particular to a fishbone-shaped cardanol-derived polymer demulsifier and a preparation method thereof. Background Art

[0002] With the development of society, the demand for oil, one of the most important strategic and energy resources, is increasing. During the oil extraction process, crude oil inevitably mixes with water. Natural emulsifiers in crude oil make it prone to forming relatively stable emulsions under shear and extrusion. These stable emulsions can cause serious corrosion or blockage of plant equipment and pipelines, creating operational and safety issues for oilfield production. Therefore, emulsion demulsification and dehydration are essential during oilfield production.

[0003] Currently, common demulsification and dehydration methods include physical, chemical, and biological methods. Chemical demulsification is widely used in oilfields due to its convenience, speed, and exceptional efficiency. However, due to the wide variation in crude oil composition, demulsifiers cannot achieve a "one-to-all" or even "one-to-many" effect, resulting in numerous limitations for chemical demulsifiers. As oilfields develop and crude oil emulsions become more stable, the effectiveness of existing demulsifiers declines. Most current demulsifiers are unable to meet the demulsification and dehydration requirements of oilfield emulsions, and they suffer from a range of issues, including high dosage requirements, long demulsification times, and turbid emulsion water quality. Summary of the Invention

[0004] In order to solve the problems existing in the background technology, the present invention provides a fishbone-shaped cardanol-derived polymer demulsifier and a preparation method thereof. The fishbone-shaped cardanol-derived polymer demulsifier can be applied to the demulsification of different types of oil-in-water emulsions and has ultra-high demulsification efficiency.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] In a first aspect, the present invention provides a fishbone-shaped cardanol-derived polymer demulsifier, which is obtained by connecting a hydrophilic monofunctional polyetheramine to polycardanol glycidyl ether, and has the general structural formula:

[0007]

[0008] Wherein, m is an integer between 1 and 1000, R is an EO / PO copolymer, and the structural formula is Where 0≤x<y≤100, and x+y>10, y / x>4, R1=C 15 H 31-n , where n = 0, 2, 4 or 6.

[0009] In a second aspect, the present invention provides a method for preparing the fishbone-shaped cardanol-derived polymer demulsifier, comprising the following steps:

[0010] S1. Preparation of polycardanol;

[0011] S2. The polycardanol is reacted with epichlorohydrin to prepare polycardanol glycidyl ether;

[0012] S3. performing a ring-opening reaction on polycardanol glycidyl ether and a hydrophilic monofunctional polyetheramine to obtain the fishbone-shaped cardanol-derived polymer demulsifier.

[0013] According to the above scheme, step S1 is specifically as follows: adding cardanol and a catalyst into a reactor, mixing them evenly at 50-80°C, adding formaldehyde aqueous solution dropwise, then heating to 80-110°C for reaction for 1-2h, and finally heating to 120-150°C and distilling under reduced pressure to obtain polycardanol.

[0014] According to the above scheme, the cardanol is an extract of cashew nut shell liquid, and the catalyst is one or more of zinc acetate, hydrochloric acid, acetic acid, oxalic acid, and p-toluenesulfonic acid.

[0015] According to the above scheme, the amount of the catalyst used is 1% to 5% of the mass of cardanol, the formaldehyde content in the formaldehyde aqueous solution is 35% to 40%, and the molar ratio of the cardanol to the formaldehyde is 1: (0.6 to 0.9).

[0016] According to the above scheme, step S2 is specifically as follows: polycardanol, epichlorohydrin and catalyst are added to a reactor, mixed evenly and reacted at 80-110°C for 2-6 hours, then cooled to 50-80°C for a ring-closure reaction, and sodium hydroxide solution is added dropwise within 1-2 hours and reacted for 2-10 hours, and the solvent and impurities are removed to obtain polycardanol glycidyl ether.

[0017] According to the above scheme, the molar ratio of polycardanol to epichlorohydrin is 1: (3 to 10), the catalyst is one or more of benzyltriethylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium chloride, tetrabutylammonium hydrogen sulfate, and trioctylmethylammonium chloride, the amount of the catalyst is 0.5% to 3% of the polycardanol, and the concentration of the sodium hydroxide solution is 10%-50%.

[0018] According to the above scheme, step S3 specifically comprises: adding polycardanol glycidyl ether and hydrophilic monofunctional polyetheramine to a solvent, mixing them evenly, reacting them at 20-60° C. for 2-5 hours, and removing the solvent and impurities to obtain a fishbone-shaped cardanol-derived polymer demulsifier.

[0019] According to the above scheme, the structural formula of the hydrophilic monofunctional polyetheramine is In the EO / PO block copolymer, 0≤x<y≤100, and x+y>10, y / x>4.

[0020] According to the above scheme, the molar ratio of the polycardanol glycidyl ether to the hydrophilic monofunctional polyetheramine is 1:(0.5-2), and the solvent is one or more of chloroform, dioxane, N-methylpyrrolidone, N,N-dimethylformamide, and dimethyl sulfoxide.

[0021] The beneficial effects of the present invention are:

[0022] The main chain of the fishbone-shaped cardanol-derived polymer demulsifier of the present invention has a large number of benzene rings, one end of which is connected to a long hydrophobic alkyl chain, and the other end is grafted with a hydrophilic polyetheramine, presenting a fishbone shape. The entire demulsifier molecule exhibits amphiphilicity, has high interfacial activity, can significantly reduce the oil-water interfacial tension, can interact with asphaltene, displace the asphaltene on the interfacial film, soften or destroy the interfacial film, and cause the demulsification process to occur.

[0023] The fishbone-shaped cardanol-derived polymer demulsifier of the present invention can be applied to the demulsification of different types of oil-in-water emulsions. Under the condition that the concentration of the demulsifier is 250 mg / L, the demulsification efficiency of crude oil within 2 hours is above 93%, the demulsification efficiency is high and the demulsification time is short; it has a good demulsification effect at 50°C and above, the demulsification temperature is low, the demulsification efficiency is less affected by pH, and it has a high demulsification efficiency in both strong acid and strong alkaline environments; it has a high demulsification efficiency at a high salt concentration of 50,000 mg / L, has high salt resistance, and is applicable to the demulsification of oil-water emulsions with different formation water properties. The preparation method thereof has the characteristics of a simple process flow, a low reaction temperature, a fast reaction time, and the like. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with specific embodiments. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] It should be noted that, in the description of the embodiments of this application, the term "some specific embodiments" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0026] The present invention provides a fishbone-shaped cardanol-derived polymer demulsifier, which is obtained by connecting a hydrophilic monofunctional polyetheramine to polycardanol glycidyl ether, and its general structural formula is:

[0027]

[0028] Wherein, m is an integer between 1 and 1000, R is an EO / PO copolymer, and the structural formula is Where 0≤x<y≤100, and x+y>10, y / x>4, R1=C 15 H 31-n , where n = 0, 2, 4 or 6.

[0029] The present invention also provides a method for preparing the fishbone-shaped cardanol-derived polymer demulsifier, comprising the following steps:

[0030] S1. Preparation of polycardanol;

[0031] S2. The polycardanol is reacted with epichlorohydrin to prepare polycardanol glycidyl ether;

[0032] S3. performing a ring-opening reaction on polycardanol glycidyl ether and a hydrophilic monofunctional polyetheramine to obtain the fishbone-shaped cardanol-derived polymer demulsifier.

[0033] In some specific embodiments, step S1 is specifically as follows: adding cardanol and a catalyst into a reactor, mixing them evenly at 50-80° C., adding formaldehyde aqueous solution dropwise, then heating to 80-110° C. to react for 1-2 hours, and finally heating to 120-150° C. and distilling under reduced pressure to obtain polycardanol.

[0034] In some specific embodiments, the cardanol is an extract of cashew nut shell liquid, and the catalyst is one or more of zinc acetate, hydrochloric acid, acetic acid, oxalic acid, and p-toluenesulfonic acid.

[0035] In some specific embodiments, the amount of the catalyst is 1% to 5% of the mass of cardanol, the formaldehyde content in the formaldehyde aqueous solution is 35% to 40%, and the molar ratio of the cardanol to the formaldehyde is 1:(0.6 to 0.9).

[0036] In some specific embodiments, step S2 is specifically as follows: adding polycardanol, epichlorohydrin and a catalyst to a reactor, mixing them evenly, reacting at 80-110° C. for 2-6 hours, then cooling to 50-80° C. for a ring-closure reaction, adding the sodium hydroxide solution dropwise within 1-2 hours, reacting for 2-10 hours, and removing the solvent and impurities to obtain polycardanol glycidyl ether.

[0037] In some specific embodiments, the molar ratio of the polycardanol to epichlorohydrin is 1: (3 to 10), the catalyst is one or more of benzyltriethylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium chloride, tetrabutylammonium hydrogen sulfate, and trioctylmethylammonium chloride, the amount of the catalyst is 0.5% to 3% of the polycardanol, and the concentration of the sodium hydroxide solution is 10%-50%.

[0038] In some specific embodiments, step S3 is specifically: adding polycardanol glycidyl ether and hydrophilic monofunctional polyetheramine to a solvent, mixing them evenly, reacting at 20-60° C. for 2-5 hours, and removing the solvent and impurities to obtain a fishbone-shaped cardanol-derived polymer demulsifier.

[0039] In some specific embodiments, the structural formula of the hydrophilic monofunctional polyetheramine is In the EO / PO block copolymer, 0≤x<y≤100, and x+y>10, y / x>4.

[0040] In some specific embodiments, the molar ratio of the polycardanol glycidyl ether to the hydrophilic monofunctional polyetheramine is 1:(0.5-2), and the solvent is one or more of chloroform, dioxane, N-methylpyrrolidone, N,N-dimethylformamide, and dimethyl sulfoxide.

[0041] Based on the above embodiments, the present invention is further described in the following specific examples. It should be understood that these examples are intended to illustrate the present invention only and are not intended to limit the scope of the present invention. Experimental methods in the following examples, where specific conditions are not specified, generally follow the conditions recommended by the manufacturer. Unless otherwise stated, percentages and parts are calculated by mass.

[0042] Example 1

[0043] This embodiment provides a fishbone-shaped cardanol-derived polymer demulsifier, which is obtained by the following steps:

[0044] 300 g of cardanol and 10 g of zinc acetate were added to a reactor, mixed evenly at 60°C, and then 70 g of formaldehyde was added dropwise. The temperature was then raised to 80°C and reacted for 2 h. Finally, the temperature was raised to 140°C and distilled under reduced pressure to obtain polycardanol.

[0045] 350g of polycardanol, 700g of epichlorohydrin, and 10g of tetrabutylammonium bromide were added to a reactor, mixed evenly, and reacted at 90°C for 3h. The temperature was then lowered to 60°C for a ring-closure reaction. 250g of 30% sodium hydroxide solution was added dropwise over 2h, and the reaction was continued for 5h. The solvent and impurities were removed to obtain polycardanol glycidyl ether.

[0046] 400 g of polycardanol glycidyl ether and 500 g of L-55 (Huntsman, Mn=500, PO / EO=2 / 9) were added to chloroform, mixed evenly, and reacted at 30° C. for 2 h. The solvent and impurities were removed to obtain a fishbone-shaped cardanol-derived polymer demulsifier.

[0047] Example 2

[0048] This embodiment provides a fishbone-shaped cardanol-derived polymer demulsifier, which is obtained by the following steps:

[0049] 300 g of cardanol and 10 g of zinc acetate were added to a reactor, mixed evenly at 60°C, and then 70 g of formaldehyde was added dropwise. The temperature was then raised to 80°C and reacted for 2 h. Finally, the temperature was raised to 140°C and distilled under reduced pressure to obtain polycardanol.

[0050] 350g of polycardanol, 700g of epichlorohydrin, and 10g of tetrabutylammonium bromide were added to a reactor, mixed evenly, and reacted at 90°C for 3h. The temperature was then lowered to 60°C for a ring-closure reaction. 250g of 30% sodium hydroxide solution was added dropwise over 2h, and the reaction was continued for 5h. The solvent and impurities were removed to obtain polycardanol glycidyl ether.

[0051] 400 g of polycardanol glycidyl ether and 1000 g of L-100 (Huntsman, Mn=1000, PO / EO=3 / 19) were added to chloroform, mixed evenly, and reacted at 40° C. for 3 h. The solvent and impurities were removed to obtain a fishbone-shaped cardanol-derived polymer demulsifier.

[0052] Example 3

[0053] This embodiment provides a fishbone-shaped cardanol-derived polymer demulsifier, which is obtained by the following steps:

[0054] 300 g of cardanol and 10 g of zinc acetate were added to a reactor, mixed evenly at 60°C, and then 70 g of formaldehyde was added dropwise. The temperature was then raised to 80°C and reacted for 2 h. Finally, the temperature was raised to 140°C and distilled under reduced pressure to obtain polycardanol.

[0055] 350g of polycardanol, 700g of epichlorohydrin, and 10g of tetrabutylammonium bromide were added to a reactor, mixed evenly, and reacted at 90°C for 3h. The temperature was then lowered to 60°C for a ring-closure reaction. 250g of 30% sodium hydroxide solution was added dropwise over 2h, and the reaction was continued for 5h. The solvent and impurities were removed to obtain polycardanol glycidyl ether.

[0056] 400 g of polycardanol glycidyl ether and 2000 g of L-200 (Huntsman, Mn=2000, PO / EO=3 / 42) were added to chloroform, mixed evenly, and reacted at 50° C. for 5 h. The solvent and impurities were removed to obtain a fishbone-shaped cardanol-derived polymer demulsifier.

[0057] Comparative Example 1

[0058] This embodiment provides a fishbone-shaped cardanol-derived polymer demulsifier, which is obtained by the following steps:

[0059] 300 g of cardanol and 10 g of zinc acetate were added to a reactor, mixed evenly at 60°C, and then 70 g of formaldehyde was added dropwise. The temperature was then raised to 80°C and reacted for 2 h. Finally, the temperature was raised to 140°C and distilled under reduced pressure to obtain polycardanol.

[0060] 350g of polycardanol, 700g of epichlorohydrin, and 10g of tetrabutylammonium bromide were added to a reactor, mixed evenly, and reacted at 90°C for 3h. The temperature was then lowered to 60°C for a ring-closure reaction. 250g of 30% sodium hydroxide solution was added dropwise over 2h, and the reaction was continued for 5h. The solvent and impurities were removed to obtain polycardanol glycidyl ether.

[0061] 400 g of polycardanol glycidyl ether and 60 g of ethanolamine were added to chloroform, mixed evenly, and reacted at 30° C. for 2 h. The solvent and impurities were removed to obtain a fishbone-shaped cardanol-derived polymer demulsifier.

[0062] Test Example 1

[0063] The fishbone-like cardanol-derived polymer demulsifier prepared based on Examples 1 to 3 and Comparative Example 1 was used to characterize the demulsification performance of the fishbone-like cardanol-derived polymer demulsifier in crude oil emulsion.

[0064] 150 parts by mass of crude oil (crude oil source: Changqing Oilfield, viscosity at 25°C: 7.6 mPa·s, asphaltene: 14 wt%, resin: 6.03 wt%, wax: 15.46%, water: 1.6 wt%; Fushan Oilfield, viscosity at 25°C: 200.4 mPa·s, asphaltene: 16.5 wt%, resin: 9.3 wt%, wax: 16.8%, water: 1.56 wt%) was added to 350 parts by mass of water, stirred and mixed, heated to 70°C, and then stirred at a speed of 11,000 r / min for 20 min. This process was repeated three times until a stable emulsion was obtained.

[0065] The fishbone-shaped cardanol-derived polymer demulsifiers prepared in Examples 1 to 3 and Comparative Example 1 were added to xylene to prepare demulsifier solutions with a mass fraction of 0.5%, namely, experimental groups 1-4.

[0066] 1 part by volume of the above demulsifier solution was added to 20 parts by volume of crude oil emulsion and mixed evenly. The mixture was then transferred to a 50°C water bath and allowed to stand for 2 hours. The demulsification efficiency was characterized by measuring the dehydration rate. The results are shown in Table 1.

[0067] Table 1 Demulsification results of experimental groups 1-4

[0068]

[0069] As shown in Table 1, the fishbone-shaped cardanol-derived polymer demulsifiers prepared in Examples 1-3 all have very good demulsification performance. Under the condition of a demulsifier concentration of 250 mg / L, the demulsification efficiency of crude oil within 2 hours is above 93%. The reason for the different demulsification efficiencies of the prepared fishbone-shaped cardanol-derived polymer demulsifiers is that the hydrophilicity and hydrophobicity of the demulsifiers prepared in different embodiments are different, resulting in differences in the interfacial activity of the demulsifier molecules, showing different demulsification performance. In addition, the larger the molecular weight of the grafted hydrophilic polyetheramine in different embodiments, the greater the steric hindrance and the lower the grafting rate. The fishbone-shaped cardanol-derived polymer demulsifier prepared in the comparative example has a lower demulsification efficiency, mainly because the grafted ethanolamine provides fewer hydrophilic groups, which makes the interfacial activity of the demulsifier lower, resulting in lower demulsification efficiency.

[0070] Test Example 2

[0071] Based on the fishbone-like cardanol-derived polymer demulsifier prepared in Example 1, fishbone-like cardanol-derived polymer demulsifier solutions of different concentrations were prepared to characterize the demulsification performance of fishbone-like cardanol-derived polymer demulsifiers of different concentrations in crude oil emulsion.

[0072] 150 parts by mass of crude oil (crude oil source: Changqing Oilfield, viscosity at 25°C: 7.6 mPa·s, asphaltene: 14 wt%, resin: 6.03 wt%, wax: 15.46%, water: 1.6 wt%; Fushan Oilfield, viscosity at 25°C: 200.4 mPa·s, asphaltene: 16.5 wt%, resin: 9.3 wt%, wax: 16.8%, water: 1.56 wt%) was added to 350 parts by mass of water, stirred and mixed, heated to 70°C, and then stirred at a speed of 11,000 r / min for 20 min. This process was repeated three times until a stable emulsion was obtained.

[0073] Different weight portions of the fishbone-shaped cardanol-derived polymer demulsifier prepared in Example 1 were added to xylene to prepare demulsifier solutions with mass fractions of 0.5%, 0.4%, 0.3%, 0.2%, and 0.1%, respectively. The obtained samples were recorded as experimental groups 5-9; the blank group was 0%, recorded as experimental group 10.

[0074] 1 part by volume of the experimental groups 5-10 was added to 20 parts by volume of the crude oil emulsion and mixed evenly. The mixture was then transferred to a 50° C. water bath and allowed to stand for 2 h. The dehydration rate was measured. The results are shown in Table 2.

[0075] Table 2 Demulsification results of experimental groups 5-10

[0076]

[0077]

[0078] As shown in Table 2, the fishbone-shaped cardanol-derived polymer demulsifier provided by the present invention has good demulsification performance in both crude oils and is suitable for demulsification of different types of water-in-oil emulsions.

[0079] Test Example 3

[0080] Based on the fishbone-like cardanol-derived polymer demulsifier prepared in Example 1, experimental groups 11-14 were established in sequence to characterize the demulsification performance of the fishbone-like cardanol-derived polymer demulsifier at different temperatures.

[0081] 150 parts by mass of crude oil (crude oil source: Changqing Oilfield, viscosity at 25°C: 7.6 mPa·s, asphaltene: 14 wt%, resin: 6.03 wt%, wax: 15.46%, water: 1.6 wt%; Fushan Oilfield, viscosity at 25°C: 200.4 mPa·s, asphaltene: 16.5 wt%, resin: 9.3 wt%, wax: 16.8%, water: 1.56 wt%) was added to 350 parts by mass of water, stirred and mixed, heated to 70°C, and then stirred at a speed of 11,000 r / min for 20 min. This process was repeated three times until a stable emulsion was obtained.

[0082] The fishbone-shaped cardanol-derived polymer demulsifier prepared in Example 1 was added to xylene to prepare a demulsifier solution with a mass fraction of 0.5%.

[0083] 1 part by volume of the above experimental groups 11-14 was added to 20 parts by volume of crude oil emulsion and mixed evenly. The mixture was then transferred to water baths at different temperatures and allowed to stand for 2 h. The dehydration rates were measured. The results are shown in Table 3.

[0084] Table 3 Demulsification results of experimental groups 11-14

[0085]

[0086] As shown in Table 3, the fishbone-shaped cardanol-derived polymer demulsifier provided by the present invention has good demulsification performance above 50° C. in both crude oils, and the demulsification temperature is low.

Claims

1. A fishbone-shaped cardanol-derived polymer demulsifier, characterized in that: The demulsifier is obtained by connecting a hydrophilic monofunctional polyetheramine to polycardanol glycidyl ether, and its general structural formula is: Wherein, m is an integer between 1 and 1000, R is an EO / PO copolymer, and the structural formula is Where 0≤x<y≤100, and x+y>10, y / x>4, R1=C 15 H 31-n , where n = 0, 2, 4 or 6.

2. The method for preparing the fishbone-shaped cardanol-derived polymer demulsifier according to claim 1, characterized in that: The steps include: S1. Preparation of polycardanol; S2. The polycardanol is reacted with epichlorohydrin to prepare polycardanol glycidyl ether; S3. performing a ring-opening reaction on polycardanol glycidyl ether and a hydrophilic monofunctional polyetheramine to obtain the fishbone-shaped cardanol-derived polymer demulsifier.

3. The method for preparing the fishbone-shaped cardanol-derived polymer demulsifier according to claim 2, characterized in that: Step S1 is specifically as follows: adding cardanol and a catalyst into a reactor, mixing them evenly at 50-80° C., adding formaldehyde aqueous solution dropwise, then heating to 80-110° C. for reaction for 1-2 hours, and finally heating to 120-150° C. and distilling under reduced pressure to obtain polycardanol.

4. The method for preparing the fishbone-shaped cardanol-derived polymer demulsifier according to claim 3, characterized in that: The cardanol is an extract of cashew nut shell liquid, and the catalyst is one or more of zinc acetate, hydrochloric acid, acetic acid, oxalic acid, and p-toluenesulfonic acid.

5. The method for preparing the fishbone-shaped cardanol-derived polymer demulsifier according to claim 4, characterized in that: The amount of the catalyst used is 1% to 5% of the mass of the cardanol, the content of formaldehyde in the formaldehyde aqueous solution is 35% to 40%, and the molar ratio of the cardanol to the formaldehyde is 1:(0.6 to 0.9).

6. The method for preparing the fishbone-shaped cardanol-derived polymer demulsifier according to claim 2, characterized in that: Step S2 is specifically as follows: polycardanol, epichlorohydrin and a catalyst are added to a reactor, mixed evenly and reacted at 80-110° C. for 2-6 hours, then cooled to 50-80° C. for a ring-closure reaction, and the sodium hydroxide solution is added dropwise within 1-2 hours and reacted for 2-10 hours, and the solvent and impurities are removed to obtain polycardanol glycidyl ether.

7. The method for preparing the fishbone-shaped cardanol-derived polymer demulsifier according to claim 6, characterized in that: The molar ratio of the polycardanol to epichlorohydrin is 1:(3-10), the catalyst is one or more of benzyltriethylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium chloride, tetrabutylammonium hydrogen sulfate, and trioctylmethylammonium chloride, the amount of the catalyst is 0.5%-3% of the polycardanol, and the concentration of the sodium hydroxide solution is 10%-50%.

8. The method for preparing the fishbone-shaped cardanol-derived polymer demulsifier according to claim 2, characterized in that: Step S3 is specifically as follows: adding polycardanol glycidyl ether and hydrophilic monofunctional polyetheramine to a solvent, mixing them evenly, reacting them at 20-60° C. for 2-5 hours, and removing the solvent and impurities to obtain a fishbone-shaped cardanol-derived polymer demulsifier.

9. The method for preparing the fishbone-shaped cardanol-derived polymer demulsifier according to claim 8, characterized in that: The structural formula of the hydrophilic monofunctional polyetheramine is In the EO / PO block copolymer, 0≤x<y≤100, and x+y>10, y / x>4.

10. The method for preparing the fishbone-shaped cardanol-derived polymer demulsifier according to claim 8 or 9, characterized in that: The molar ratio of the polycardanol glycidyl ether to the hydrophilic monofunctional polyetheramine is 1:(0.5-2), and the solvent is one or more of chloroform, dioxane, N-methylpyrrolidone, N,N-dimethylformamide, and dimethyl sulfoxide.

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