CN-121975548-A - Demulsifier and preparation method thereof

CN121975548ACN 121975548 ACN121975548 ACN 121975548ACN-121975548-A

Abstract

The application discloses a demulsifier and a preparation method thereof, and belongs to the technical field of demulsifiers. The preparation method of the demulsifier comprises the steps of adding ferric trichloride hexahydrate, sodium acetate and polyethylene glycol into a polyalcohol solvent, uniformly mixing at 60-80 ℃, adding bentonite, performing ultrasonic dispersion for 20-40min, then reacting at 180-250 ℃ for 20-30h, washing, drying, performing ultrasonic dispersion on the obtained magnetic bentonite in an organic solvent for 15-30min, adding a silane coupling agent, stirring for 6-10h at 70-85 ℃, collecting magnets, washing, drying, performing ultrasonic dispersion on the obtained silanized magnetic bentonite in the organic solvent for 15-30min, dissolving an acrylic copolymer demulsifier and sulfonate into the organic solvent, adding 4-dimethylaminopyridine, performing ultrasonic dispersion for 10-20min, adding the obtained mixture into a silanized magnetic bentonite solution, stirring for 4-6h at 85-110 ℃, collecting magnets, washing, and drying to obtain the demulsifier. The demulsifier is safe and environment-friendly, and can repeatedly and efficiently realize demulsification.

Inventors

CUI SHIZHANG
PETUKHOV
ZHANG XIANGHONG
Yin Kaiquan
YANG ZHENZHONG
LI NINGFENG
LIU CHENGLONG
ZHOU LIQUN
ZHANG PENG

Assignees

德仕能源科技集团股份有限公司
山东德仕化工有限公司

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (7)

1. The preparation method of the demulsifier is characterized by comprising the following steps of: (1) Adding ferric trichloride hexahydrate, sodium acetate and polyethylene glycol with the weight ratio of (1.2-1.7) to (3-4) 1 into a polyalcohol solvent, uniformly mixing at 60-80 ℃, adding bentonite with the weight ratio of 70-80% of ferric trichloride hexahydrate, performing ultrasonic dispersion for 20-40min, reacting at 180-250 ℃ for 20-30h, washing, and drying to obtain magnetic bentonite; (2) Dispersing magnetic bentonite in an organic solvent for 15-30min by ultrasonic, adding a silane coupling agent, wherein the weight ratio of the magnetic bentonite to the silane coupling agent is 1 (3.2-5), stirring for 6-10h at 70-85 ℃, collecting by using a magnet, washing and drying to obtain silanized magnetic bentonite; (3) The silanized magnetic bentonite is ultrasonically dispersed in an organic solvent for 15-30min to obtain silanized magnetic bentonite solution, an acrylic copolymer demulsifier and a sulfonate demulsifier are dissolved in the organic solvent, the weight ratio of the silanized magnetic bentonite to the acrylic copolymer demulsifier to the sulfonate demulsifier is 1 (6-7.2) (2.8-3.5), then 4-dimethylaminopyridine with 76-83wt% of silanized magnetic bentonite is added for ultrasonic dispersion for 10-20min, then the silanized magnetic bentonite solution is added, stirred for 4-6h at 85-110 ℃, and the demulsifier is obtained by separating and collecting by a magnet, washing and drying.
2. The method of claim 1, wherein the polyol solvent is ethylene glycol or diethylene glycol; And/or the silane coupling agent is (3-glycidoxy) trimethoxysilane, (3-glycidoxy) triethoxysilane or (3-glycidoxy) methyldimethoxysilane.
3. The method of claim 1, wherein the method of preparing the acrylic copolymer demulsifier comprises: And (3) placing an initiator accounting for 0.8-1.2wt% of the total weight of N-methylol acrylamide, alkyl acrylate and monomers into a reaction container, adding an organic solvent for dissolution, then introducing inert gas, heating to 70-80 ℃ for reaction for 7-15h, cooling the system to room temperature after the reaction is finished, washing, and drying to obtain the acrylic ester copolymer demulsifier.
4. The process according to claim 3, wherein the weight ratio of N-methylolacrylamide to alkyl acrylate is 1 (1.5-3).
5. A method of preparation according to claim 3, wherein the alkyl acrylate is methyl acrylate, ethyl acrylate or butyl acrylate; And/or the initiator is azodiisobutyronitrile or benzoyl peroxide; And/or the organic solvent is toluene or xylene.
6. The method of claim 1, wherein the sulfonate demulsifier is sodium laurylisethionate, sodium cocoylisethionate, or sodium lignin sulfonate.
7. A demulsifier prepared by the preparation method according to any one of claims 1 to 6.

Description

Demulsifier and preparation method thereof Technical Field The application relates to a demulsifier and a preparation method thereof, and belongs to the technical field of demulsifiers. Background The complexity of oil recovery technology has increased significantly after the mid-to-late recovery of the oil field, particularly as the components of the crude oil recovery fluid have become more complex with the widespread use of oil recovery aids, typically oil-water mixed emulsions. In such emulsions, the water content is generally more than 80%, sometimes even up to more than 90%. Such high water-containing crude oil emulsions are extremely detrimental to storage and transportation, not only increasing energy consumption during transportation, but also potentially leading to corrosion and scaling of metal pipelines. How to effectively separate oil and water from an emulsion has become an important issue, so it is urgent to study efficient demulsification techniques. At present, a method of demulsification by adding chemical agents is often adopted on site, and the most used chemical demulsifiers are mainly polyether demulsifiers. For example, chinese patent application CN121181874A discloses a low-temperature polyether demulsifier for oil and gas gathering and a preparation method thereof, the demulsifier is prepared by compounding cardanol, pentaethylenehexamine and bisphenol F according to a specific molar ratio as an initiator, preparing the compound initiator through formaldehyde condensation, forming a polyether skeleton through segmented block copolymerization of propylene oxide and ethylene oxide, introducing a fluorine-containing epoxy monomer for terminal fluorination modification, and finally carrying out chain extension crosslinking on adipic acid and epichlorohydrin. The demulsifier realizes high-efficiency demulsification at low temperature. However, both ethylene oxide and propylene oxide in the demulsifier feed are dangerous goods and present serious safety issues during transportation. In addition, the demulsifier may remain in the crude oil, which has a negative impact on downstream processing and environmental protection. Therefore, the development of safe, efficient and environment-friendly demulsifiers has become an important research direction in the field of oilfield chemistry. Disclosure of Invention In order to solve the problems, the demulsifier and the preparation method thereof are provided, so that the demulsifier is safe and environment-friendly, and can repeatedly and efficiently realize demulsification. According to one aspect of the present application, there is provided a method of preparing a demulsifier comprising the steps of: (1) Adding ferric trichloride hexahydrate, sodium acetate and polyethylene glycol into a polyalcohol solvent, uniformly mixing at 60-80 ℃, adding bentonite, performing ultrasonic dispersion for 20-40min, reacting at 180-250 ℃ for 20-30h, washing, and drying to obtain magnetic bentonite; (2) Dispersing magnetic bentonite in an organic solvent for 15-30min by ultrasonic, adding a silane coupling agent, stirring for 6-10h at 70-85 ℃, then collecting by using a magnet, washing and drying to obtain silanized magnetic bentonite; (3) And (3) performing ultrasonic dispersion on the silanized magnetic bentonite in an organic solvent for 15-30min to obtain silanized magnetic bentonite solution, dissolving an acrylic copolymer demulsifier and a sulfonate demulsifier in the organic solvent, adding 4-dimethylaminopyridine, performing ultrasonic dispersion for 10-20min, adding the mixture into the silanized magnetic bentonite solution, stirring for 4-6h at 85-110 ℃, separating and collecting the mixture by using a magnet, washing and drying the mixture to obtain the demulsifier. Optionally, the weight ratio of the ferric trichloride hexahydrate to the sodium acetate to the polyethylene glycol is (1.2-1.7): 3-4): 1; and/or the addition amount of the bentonite is 70-80wt% of ferric trichloride hexahydrate. Optionally, the weight ratio of the magnetic bentonite to the silane coupling agent is 1 (3.2-5). Optionally, the weight ratio of the silanized magnetic bentonite, the acrylic copolymer demulsifier and the sulfonate demulsifier is 1 (6-7.2) (2.8-3.5); And/or the addition amount of the 4-dimethylaminopyridine is 76-83wt% of the silanized magnetic bentonite. Optionally, the polyol solvent is ethylene glycol or diethylene glycol; And/or the silane coupling agent is (3-glycidoxy) trimethoxysilane, (3-glycidoxy) triethoxysilane or (3-glycidoxy) methyldimethoxysilane. Optionally, the preparation method of the acrylic copolymer demulsifier comprises the following steps: And (3) placing an initiator accounting for 0.8-1.2wt% of the total weight of N-methylol acrylamide, alkyl acrylate and monomers into a reaction container, adding an organic solvent for dissolution, then introducing inert gas, heating to 70-80 ℃ for reaction for 7-15h, cooling the system to room temperat