CN111057577A - Acrylate copolymer and preparation method thereof, water-in-oil emulsion demulsifier and application thereof - Google Patents
Acrylate copolymer and preparation method thereof, water-in-oil emulsion demulsifier and application thereof Download PDFInfo
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- CN111057577A CN111057577A CN201811211066.XA CN201811211066A CN111057577A CN 111057577 A CN111057577 A CN 111057577A CN 201811211066 A CN201811211066 A CN 201811211066A CN 111057577 A CN111057577 A CN 111057577A
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G33/00—Dewatering or demulsification of hydrocarbon oils
- C10G33/04—Dewatering or demulsification of hydrocarbon oils with chemical means
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Abstract
The invention relates to an acrylic copolymer and a preparation method thereof, wherein the acrylic copolymer is prepared by polymerizing a polyoxyethylene polyoxypropylene ether monomer with a double bond at the end group, a hydrophobic monomer and an optional hydrophilic monomer through free radicals; wherein the polyoxyethylene polyoxypropylene ether monomer with the terminal group containing double bonds comprises polyoxyethylene polyoxypropylene ether with allyl alcohol as an initiator; the hydrophobic monomer is selected from butyl acrylate and/or methyl methacrylate; the hydrophilic monomer is acrylic acid. The invention also relates to a water-in-oil emulsion demulsifier, which comprises the acrylate copolymer. The invention further relates to a method for treating a water-in-oil emulsion. When the acrylate copolymer provided by the invention is used as the demulsifier, the surface activity of the demulsifier is enhanced, the demulsification and dehydration performances of the demulsifier on the crude oil-in-oil emulsion are improved, the demulsification temperature is reduced while the dehydration rate of the crude oil emulsion is ensured, and the purposes of energy conservation and consumption reduction are achieved.
Description
Technical Field
The invention belongs to the technical field of crude oil demulsifiers, and particularly relates to an acrylate copolymer and a preparation method thereof, a water-in-oil emulsion demulsifier and application thereof.
Background
The addition of chemicals to the crude oil emulsion to break the emulsion is known as chemical demulsification and can be used either alone or in combination with other methods. Demulsifiers have been studied and used for over 80 years. The molecular structure of the demulsifier is developed from the initial anionic surfactant to the block copolymer taking propylene oxide and ethylene oxide as monomers after the 40 th generation of 20 th century, and the research of the demulsifier is greatly advanced, wherein the block copolymer takes the propylene oxide and the ethylene oxide as monomers, and the conventional high-molecular nonionic surfactant, the multielement linear or body type polymer, the zwitterionic polymer and the compound thereof and the like. However, with the use of tertiary oil recovery, heavy oil recovery, and offshore oil recovery, the demulsifier not only needs to satisfy the basic performance of conventional demulsifiers, but also needs to satisfy the requirements of dehydration process under the conditions of high speed, high efficiency, and low temperature. Therefore, it is very necessary to research a novel high-efficiency crude oil demulsifier.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides an acrylate copolymer, a preparation method thereof, a water-in-oil emulsion demulsifier and application thereof. Through repeated experimental research, the inventor of the invention finds that the acrylate copolymer can be synthesized in one step by adopting polyoxyethylene polyoxypropylene ether with double bonds at the end group, hydrophobic monomer and hydrophilic monomer through free radical polymerization. When the demulsifier containing the copolymer is used for treating the water-in-oil emulsion, the surface activity of the demulsifier is enhanced because the copolymer contains two structures of polyether and acrylic ester, the demulsification and dehydration performances of the demulsifier on the crude oil-in-oil emulsion are improved, the demulsification temperature is reduced while the dehydration rate of the crude oil emulsion is ensured, and the purposes of energy conservation and consumption reduction are achieved.
To this end, the invention provides an acrylate copolymer, which is prepared by free radical polymerization of a polyoxyethylene polyoxypropylene ether monomer with a double bond at the end group, a hydrophobic monomer and an optional hydrophilic monomer in a one-step method;
wherein the polyoxyethylene polyoxypropylene ether monomer with the terminal group containing double bonds is polyoxyethylene polyoxypropylene ether taking allyl alcohol as an initiator;
the hydrophobic monomer is selected from butyl acrylate and/or methyl methacrylate;
the hydrophilic monomer is acrylic acid.
According to some embodiments, the polyoxyethylene polyoxypropylene ether monomer having a double bond at the terminal group is used in an amount of 30-70 wt%, the hydrophobic monomer is used in an amount of 30-70 w%, and the hydrophilic monomer is used in an amount of 0-30 wt%, based on the total monomer weight of the polyoxyethylene polyoxypropylene ether monomer having a double bond at the terminal group, the hydrophobic monomer and the optional hydrophilic monomer.
In some preferred embodiments, the hydrophobic monomer is selected from butyl acrylate and methyl methacrylate, preferably the weight ratio of the butyl acrylate to the methyl methacrylate is (0.8-1.5):1, preferably (0.8-1.0): 1.
In the present invention, the polyoxyethylene polyoxypropylene ether monomer (also referred to as "allyl alcohol polyoxyethylene polyoxypropylene ether") using allyl alcohol as a starting material is commercially available, and has a hydroxyl value of 45. + -. 8mg KOH/g and a number average molecular weight of 2000 or more.
In some embodiments, the acrylate copolymer has a structural formula that includes structural units represented by formulas M, N, X and Y:
preferably, M is 30-70 wt% of the acrylic copolymer.
Preferably, N accounts for more than or equal to 0 weight percent of the acrylic copolymer, and X accounts for more than or equal to 0 weight percent of the acrylic copolymer; and n + x is 30-70 wt%.
Preferably, Y is 0-30 wt% of the acrylic copolymer.
In some more preferred embodiments, when n and x are not both 0, n: x ═ 1 (0.8-1.5), preferably (0.8-1.0): 1.
In the above general formula M, R has a structure represented by formula (I):
wherein a is more than 0 and b is more than 0.
In some preferred embodiments of the present invention, the acrylate copolymer has a structural formula shown in formula (II),
in formula (II), m, n, x, y and R are as defined above.
According to the present invention, a polyoxyethylene polyoxypropylene ether monomer having a double bond at the terminal, a hydrophobic monomer and optionally a hydrophilic monomer are completely polymerized by radical polymerization. Therefore, the weight percentage of each monomer based on the total monomer of the polyoxyethylene polyoxypropylene ether monomer having a double bond at the terminal, the hydrophobic monomer and the optional hydrophilic monomer is the same as the weight percentage of the corresponding structural unit based on the acrylic copolymer.
In a second aspect, the present invention provides a method for preparing the acrylate copolymer according to the first aspect, comprising the steps of:
s1, mixing a polyoxyethylene polyoxypropylene ether monomer with double bonds at the end group and a hydrophobic monomer in a solvent to form a uniform mixture 1;
s2, reacting mixture 1 in the presence of an initiator under a nitrogen atmosphere;
optionally S3, adding a mixture 2 formed by hydrophilic monomers, an initiator and a solvent into the mixture 1 after the reaction, and continuing the reaction to obtain a mixture 3;
s4, carrying out post-treatment on the mixture 3 to obtain the acrylate copolymer.
According to some embodiments, the initiator is selected from redox initiators and/or azo-type initiators. Preferably, the redox initiator is selected from benzoyl peroxide and/or benzoyl peroxide-dimethylaniline. The azo initiator is at least one selected from azobisisobutyronitrile, azobisisoheptonitrile and dimethyl azobisisobutyrate.
According to some embodiments, in step S2, the initiator is used in an amount of 0.3 wt% to 1.0 wt%, preferably 0.36 wt% to 0.67 wt%, and more preferably 0.5 wt% to 0.67 wt%, based on the total weight of the polyoxyethylene polyoxypropylene ether monomer having a double bond at the terminal and the hydrophobic monomer. The reaction temperature is 60-90 ℃, and preferably 70-80 ℃; the reaction time is 2-7h, preferably 2-4 h.
According to some embodiments, in step S3, the initiator is used in an amount of 1 wt% to 5 wt%, preferably 2.5 wt% to 5 wt%, more preferably 3.3 wt% to 5.0 wt%, based on the weight of the hydrophilic monomer. The reaction temperature is 60-90 ℃, and preferably 70-80 ℃; the reaction time is more than or equal to 4 hours.
According to some embodiments, the solvent is selected from one or more of toluene, N-dimethylformamide, butyl ether, anisole, butanone, ethyl acetate. Preferably, in step S1, the solvent is used in an amount of 20 wt% to 40 wt%, based on the total weight of the polyoxyethylene polyoxypropylene ether monomer having a double bond at the terminal and the hydrophobic monomer. In step S3, the solvent is used in an amount of 20 wt% to 40 wt%, based on the weight of the hydrophilic monomer.
According to some embodiments, in step S4, the post-treatment includes cooling the mixture 3, and subjecting the cooled mixture 3 to a desolventizing treatment, a deionized water precipitation treatment, washing, and drying treatment in this order. Wherein, the solvent adopted in the washing treatment is absolute ethyl alcohol or acetone. And carrying out post-treatment to obtain the acrylate copolymer. The copolymer is a yellowish or brownish yellow viscous liquid.
Unless otherwise specified, all starting materials or reagents used in the present invention are commercially available.
The substantial difference between the present invention and the prior art is:
the conventional polyether demulsifier is copolymerized with acrylate monomers, wherein polyether and acrylic acid are subjected to esterification reaction to prepare an intermediate, and the obtained intermediate is copolymerized with other acrylate monomers. Or firstly synthesizing an acrylate copolymer, and then esterifying and grafting polyether and the acrylate copolymer. The invention prepares the acrylate polymer by one-step free radical copolymerization without preparing an intermediate or synthesizing the acrylate polymer.
In a third aspect, the invention provides a water-in-oil emulsion demulsifier comprising an acrylate copolymer according to the first aspect of the invention or prepared according to the method of the second aspect of the invention.
In some preferred embodiments, the demulsifier is an aqueous solution of the acrylate copolymer of the present invention, wherein the concentration of the solution is from 0.5 wt% to 30.0 wt%; or mixture 1 obtained in step S2 or mixture 3 obtained in step S3 of the method for producing an acrylic copolymer of the present invention.
In a fourth aspect, the present invention provides a method of treating a water-in-oil emulsion, comprising demulsifying the water-in-oil emulsion by contacting the emulsion with a water-in-oil emulsion demulsifier according to the third aspect of the present invention and optionally with other demulsifiers; wherein the dosage of the water-in-oil emulsion demulsifier is 30-200mg, preferably 50-150mg, calculated by 1L of water-in-oil emulsion, calculated by the acrylate copolymer. Preferably, the temperature for demulsification is 50-90 ℃; the demulsification time is 0.5-8.0h, preferably 1-6 h.
According to some embodiments, the other demulsifier is selected from at least one of a polyoxyethylene polyoxypropylene ether demulsifier in which the initiator is not allyl alcohol, a non-polyether acrylate demulsifier, and a silicon-and phosphorus-containing surfactant; preferably, the dosage ratio of the other demulsifier to the water-in-oil emulsion demulsifier is (0.5-3.0): 1.
In some preferred embodiments, the acrylate-based copolymer of the present invention is used in the form of a solution thereof when treating a water-in-oil emulsion; the concentration of the solution is 0.5 wt% -30.0 wt%.
In some embodiments, the water-in-oil emulsion has a water content of 20 v% to 70 v%, and the source of the water-in-oil emulsion is an oil well production fluid.
The invention has the beneficial effects that:
the novel acrylate copolymer and the preparation method thereof adopt polyoxyethylene polyoxypropylene ether with double bonds at end groups, hydrophobic monomer and hydrophilic monomer to prepare the novel acrylate copolymer through a conventional solution free radical polymerization method, and the molecules of the novel acrylate copolymer simultaneously contain two structures of polyether and acrylic ester, so that the surface activity of the demulsifier is enhanced, the demulsification and dehydration performances of the demulsifier on crude oil-in-water emulsion are improved, the demulsification temperature is reduced while the dehydration rate of the crude oil emulsion is ensured, and the purposes of saving energy and reducing consumption are achieved. The novel demulsifier can be prepared from the copolymers with different proportions according to different crude oil water-in-oil emulsions, and can be compounded with other demulsifiers to improve the broad-spectrum performance of the reverse demulsifier.
Detailed Description
In order that the present invention may be more readily understood, the following detailed description of the invention is given by way of example only, and is not intended to limit the scope of the invention.
The test method or the calculation method provided by the invention is as follows:
water yield (%) at different settling times ═ water yield (ml) at different times/total water content (ml) in crude oil emulsion) x 100%.
Preparation example of acrylate copolymer
Example 1
The preparation method of the acrylate copolymer provided in this embodiment includes the following steps:
step 1, 20 g of polyoxyethylene polyoxypropylene ether (number average molecular weight is more than or equal to 2000, hydroxyl value is 45mg KOH/g), 10 g of hydrophobic monomer (5 g of butyl acrylate and 5 g of methyl methacrylate) and 75 g of N, N-dimethylformamide which take allyl alcohol as an initiator are weighed and added into a reactor, and the mixture is fully stirred until the mixture is completely dissolved.
And 2, replacing air in the reactor with nitrogen, continuously introducing the nitrogen, heating to 70 ℃, adding 0.2 g of azobisisobutyronitrile, starting to react, and reacting for 7 hours at 70 ℃.
And 3, cooling the reaction mixture, removing most of the solvent by using a rotary evaporator, precipitating by using deionized water, filtering, repeatedly washing a filter cake by using absolute ethyl alcohol, and then putting the washed filter cake into a vacuum oven to be dried in vacuum at 40 ℃ to constant weight to obtain light yellow viscous liquid, namely the acrylate copolymer.
Example 2
The preparation method of the acrylate copolymer provided in this embodiment includes the following steps:
step 1, weighing 10 g of polyoxyethylene polyoxypropylene ether (the number average molecular weight is more than or equal to 2000, and the hydroxyl value is 45mg KOH/g), 10 g of hydrophobic monomer (6 g of butyl acrylate and 4 g of methyl methacrylate) and 36 g of N, N-dimethylformamide which take allyl alcohol as an initiator, adding the mixture into a reactor, and fully stirring the mixture until the mixture is completely dissolved.
And 2, replacing air in the reactor with nitrogen, continuously introducing the nitrogen, heating to 80 ℃, adding 0.1 g of benzoyl peroxide to start reaction, and reacting for 3 hours at 80 ℃.
And 3, weighing 0.6 g of hydrophilic monomer, 0.02 g of benzoyl peroxide and 10 g of N, N-dimethylformamide, uniformly mixing, adding into the reactor, and continuously reacting for 4 hours at 80 ℃.
And 4, cooling the reaction mixture, removing most of the solvent by using a rotary evaporator, precipitating by using deionized water, filtering, repeatedly washing a filter cake by using absolute ethyl alcohol, and then putting the washed filter cake into a vacuum oven to be dried in vacuum at 40 ℃ to constant weight to obtain light yellow viscous liquid, namely the acrylate copolymer.
Example 3
The preparation method of the acrylate copolymer provided in this embodiment includes the following steps:
step 1, weighing 10 g of polyoxyethylene polyoxypropylene ether (the number average molecular weight is more than or equal to 2000, and the hydroxyl value is 45mg KOH/g), 18 g of hydrophobic monomer (8 g of butyl acrylate and 10 g of methyl methacrylate) and 60 g of N, N-dimethylformamide which take allyl alcohol as an initiator, adding the mixture into a reactor, and fully stirring the mixture until the mixture is completely dissolved.
And 2, replacing air in the reactor with nitrogen, continuously introducing the nitrogen, heating to 80 ℃, adding 0.1 g of benzoyl peroxide to start reaction, and reacting for 4 hours at 80 ℃.
And 3, weighing 2 g of hydrophilic monomer, 0.05 g of azobisisobutyronitrile and 8 g of N, N-dimethylformamide, uniformly mixing, adding into the reactor, and continuously reacting for 5 hours at the temperature of 80 ℃.
And 4, cooling the reaction mixture, removing most of the solvent by using a rotary evaporator, precipitating by using deionized water, filtering, repeatedly washing a filter cake by using absolute ethyl alcohol, and then putting the washed filter cake into a vacuum oven to be dried in vacuum at 40 ℃ to constant weight to obtain brown yellow viscous liquid, namely the acrylate copolymer.
Comparative example 1
The demulsifier prepared according to the method of example 1 of CN102399576A was used.
Comparative example 2
The demulsifier used on the site of a Chenzhuang united station of a Shengli oilfield estuary oil production plant is a polyoxyethylene polyoxypropylene ether taking phenolic resin as an initiator and is provided by a Shengli chemical estuary division company.
Comparative example 3
The demulsifier is a modified polyether of polyol as an initiator and is provided by Yangli chemical estuary branch company.
Use of acrylate copolymers as demulsifiers and demulsifiers for comparative examples
Application example 1
The demulsification performance of the thick oil emulsion of a Chen and village united station of a petroleum and natural gas extraction plant at a victory oil field estuary is evaluated by adopting the compound demulsifier of the embodiment 1-3, the comparative example 1-2 and the embodiment 2 and the comparative example 2 (compounded according to the mass ratio of the demulsifier of the embodiment 2 to the demulsifier of the comparative example 2 being 1: 1), and the demulsification performance of the demulsifier of crude oil is evaluated by an evaluation method specified by a service performance detection method (bottle test method) of a demulsifier of crude oil of a standard SY-Y5281-2000 in the petroleum and. The temperature of the field demulsification is 90 ℃, the test temperature is 5 ℃ lower than the field temperature, and the results are shown in Table 1.
TABLE 1 results of evaluation of demulsification Performance
(the concentration of the demulsifier in the Table indicates the amount of the demulsifier in 1L of the thick oil emulsion in mg in terms of the copolymer)
Experiments prove that under the condition that the demulsification temperature is reduced by 5 ℃ compared with the actual field demulsification temperature, the demulsification effect of the acrylic copolymer prepared by the method as the demulsifier on the thick oil emulsion of the Chen and village united station is obviously higher than that of the demulsifier prepared by the comparative example 1 (namely, the demulsifier prepared by the method of the patent CN102399576A example 1). The earlier-stage demulsification speed of the demulsifier in the embodiment 2 is obviously superior to that of other demulsifiers, but after the demulsifier is compounded with the demulsifier in the comparative example 2, the demulsification effect of the obtained demulsifier is obviously superior to that of other demulsifiers.
Application example 2
The compound demulsifier of the example 2, the comparative example 1, the comparative example 3 and the compound demulsifier of the example 2 and the comparative examples 1 and 3 (the compound is carried out according to the mass ratio of the total demulsifier of the comparative example 1 and the comparative example 3 to the demulsifier of the example 2 of 2: 1) is respectively adopted to demulsify the crude oil emulsion of the Chengdong united station of the Heijing oil and gas extraction plant in the Hekou of the Shengli oil field, and the demulsification performance of the demulsifier of crude oil is evaluated by an evaluation method specified by a service performance detection method (bottle test method) of the demulsifier of crude oil of. The demulsification temperature on site is 72 ℃, the test temperature is 10 ℃ lower than that on site, and the results are shown in Table 2.
TABLE 2 results of evaluation of demulsification Performance
(the concentration of the demulsifier in the Table indicates the amount of the demulsifier in 1L of the crude oil emulsion in mg in terms of the copolymer)
Experiments prove that under the condition that the demulsification temperature is reduced by 10 ℃ compared with the actual field demulsification temperature, the demulsification effect of the acrylate copolymer prepared by the method as the demulsifier on the Chengdong crude oil-in-oil emulsion is obviously higher than that of the demulsifier (namely the demulsifier prepared by the method of patent CN102399576A example 1) in the early stage. The earlier-stage demulsification speed of the demulsifier in the embodiment 2 is obviously superior to that of other demulsifiers, but after the demulsifier is compounded with the demulsifiers in the comparative examples 1 and 3, the demulsification effect of the obtained demulsifier is obviously superior to that of other demulsifiers.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (11)
1. An acrylate copolymer is prepared by polymerizing a polyoxyethylene polyoxypropylene ether monomer with a double bond at the end group, a hydrophobic monomer and an optional hydrophilic monomer through free radicals;
wherein the polyoxyethylene polyoxypropylene ether monomer with the terminal group containing double bonds comprises polyoxyethylene polyoxypropylene ether with allyl alcohol as an initiator;
the hydrophobic monomer is selected from butyl acrylate and/or methyl methacrylate;
the hydrophilic monomer is acrylic acid.
2. The copolymer according to claim 1, wherein the polyoxyethylene polyoxypropylene ether monomer having a double bond at the terminal is used in an amount of 30-70 wt%, the hydrophobic monomer is used in an amount of 30-70 wt%, and the hydrophilic monomer is used in an amount of 0-30 wt%, based on the total monomer weight of the polyoxyethylene polyoxypropylene ether monomer having a double bond at the terminal, the hydrophobic monomer and the optional hydrophilic monomer.
3. The copolymer of claim 1 or 2, wherein when the hydrophobic monomer is selected from butyl acrylate and methyl methacrylate, the weight ratio of butyl acrylate to methyl methacrylate is (0.8-1.5): 1.
4. A method for preparing the acrylic copolymer according to any one of claims 1 to 3, comprising the steps of:
s1, mixing a polyoxyethylene polyoxypropylene ether monomer with double bonds at the end group and a hydrophobic monomer in a solvent to form a uniform mixture 1;
s2, reacting mixture 1 in the presence of an initiator under a nitrogen atmosphere;
optionally S3, adding a mixture 2 formed by hydrophilic monomers, an initiator and a solvent into the mixture 1 after the reaction, and continuing the reaction to obtain a mixture 3;
s4, carrying out post-treatment on the mixture 3 to obtain the acrylate copolymer.
5. The method according to claim 4, wherein the initiator is selected from a redox initiator and/or an azo-type initiator;
preferably, the redox initiator is selected from benzoyl peroxide and/or benzoyl peroxide-dimethylaniline; the azo initiator is at least one selected from azobisisobutyronitrile, azobisisoheptonitrile and dimethyl azobisisobutyrate.
6. The method according to claim 4 or 5, wherein in step S2, the amount of the initiator is 0.3 to 1.0 wt% based on the total weight of the polyoxyethylene polyoxypropylene ether monomer having a double bond at the terminal and the hydrophobic monomer; and/or
The reaction temperature is 60-90 ℃, and preferably 70-80 ℃; the reaction time is 2-7h, preferably 2-4 h.
7. The method according to any one of claims 4 to 6, wherein in step S3, the initiator is used in an amount of 1 wt% to 5 wt% based on the weight of the hydrophilic monomer; and/or
The reaction temperature is 60-90 ℃, and preferably 70-80 ℃; the reaction time is more than or equal to 4 hours.
8. The production method according to any one of claims 4 to 7, wherein the solvent is one or more selected from the group consisting of toluene, N-dimethylformamide, butyl ether, anisole, methyl ethyl ketone, and ethyl acetate;
preferably, in step S1, the solvent is used in an amount of 20 wt% to 40 wt%, based on the total weight of the polyoxyethylene polyoxypropylene ether monomer having a double bond at the terminal and the hydrophobic monomer;
in step S3, the solvent is used in an amount of 20 wt% to 40 wt%, based on the weight of the hydrophilic monomer.
9. A water-in-oil emulsion breaker comprising an acrylate copolymer according to any one of claims 1 to 3 or prepared according to the process of any one of claims 4 to 8.
10. A method of treating a water-in-oil emulsion comprising contacting the water-in-oil emulsion with the water-in-oil emulsion demulsifier of claim 9 and optionally other demulsifiers to demulsify;
wherein the dosage of the water-in-oil emulsion demulsifier is 30-200mg, preferably 50-150mg, calculated by 1L of water-in-oil emulsion, calculated by acrylate copolymer;
preferably, the temperature for demulsification is 50-90 ℃; the demulsification time is 0.5-8.0h, preferably 1-6 h.
11. The treatment method of claim 10, wherein the other demulsifier is selected from at least one of a polyoxyethylene polyoxypropylene ether demulsifier in which the initiator is not allyl alcohol, a non-polyether acrylate demulsifier, and a silicon-and phosphorus-containing surfactant; preferably, the dosage ratio of the other demulsifier to the water-in-oil emulsion demulsifier is (0.5-3.0): 1.
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| CN112876586A (en) * | 2021-01-18 | 2021-06-01 | 万华化学(四川)有限公司 | Method for coagulating ABS graft latex |
| CN113201100A (en) * | 2021-04-12 | 2021-08-03 | 中海油能源发展股份有限公司 | In-situ demulsification functional associated polymer oil-displacing agent and preparation method thereof |
| CN113201100B (en) * | 2021-04-12 | 2022-11-04 | 中海油能源发展股份有限公司 | In-situ demulsification functional associated polymer oil-displacing agent and preparation method thereof |
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