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Comb-shaped polymer oil-in-water type crude oil demulsifying agent and preparation method thereof

A crude oil demulsifier, comb polymer technology, applied in chemical dehydration/demulsification, petroleum industry, treatment of hydrocarbon oil, etc., can solve the problems of secondary pollution, poor environmental friendliness of demulsifier, and achieve a neat oil-water interface , strong competitive adsorption capacity, wide-ranging effects

Active Publication Date: 2018-11-23
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These demulsifiers are poor in environmental friendliness and are likely to cause irreversible secondary pollution; in addition, there are more or less differences in the composition and properties of crude oil production fluids in each oilfield, and there is no demulsifier that can handle all types of crude oil production fluids. emulsion

Method used

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  • Comb-shaped polymer oil-in-water type crude oil demulsifying agent and preparation method thereof
  • Comb-shaped polymer oil-in-water type crude oil demulsifying agent and preparation method thereof
  • Comb-shaped polymer oil-in-water type crude oil demulsifying agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation of the butyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0044] (1) Preparation of butyl chitosan: accurately weigh 1.0g chitosan (CS) (M w =179.17kDa, degree of deacetylation >95%, viscosity 100-200mPa·s) in a 250mL three-necked flask, add 12mL isopropanol, 2g potassium hydroxide, and heat up to 40°C under stirring conditions and keep the temperature for 2h to make chitosan Alkalization of sugar. After the alkalization was completed, 3 mL of n-butane bromide was slowly added dropwise at the same reaction temperature, and the reaction was carried out at constant temperature for 6 h. After the reaction was completed, 20 mL of methanol was added to the three-necked flask to wash out the product. Use dilute hydrochloric acid with a mass fraction of 10% to adjust the pH of the system to 7, add 10mL of acetone as a precipitating agent, let it stand for precipitation and then filter, wash the fil...

Embodiment 2

[0049] The preparation of the hexyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0050] (1) Preparation of hexyl chitosan: accurately weigh 1.0g chitosan (CS) (M w =179.17kDa, degree of deacetylation >95%, viscosity 100-200mPa·s) in a 250mL three-neck flask, add 12mL of distilled water, 2g of potassium hydroxide, and steadily raise the temperature to 40°C under stirring conditions and keep the temperature for 2h to make the chitosan base change. After the alkalization was completed, 3 mL of n-bromohexane was slowly added dropwise at the same reaction temperature, and the reaction was carried out at constant temperature for 6 hours. After the reaction was completed, 20 mL of methanol was added to the three-necked flask to wash out the product. Use dilute hydrochloric acid with a mass fraction of 10% to adjust the pH of the system to 7, add 10mL of acetone as a precipitating agent, let it stand for precipitation and...

Embodiment 3

[0055] The preparation of the octyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0056] (1) Preparation of octyl chitosan: accurately weigh 1.0g chitosan (CS) (M w =179.17kDa, degree of deacetylation >95%, viscosity 100-200mPa·s) In a 250mL three-necked flask, add 6mL of distilled water, 12mL of isopropanol, 2g of potassium hydroxide, and steadily raise the temperature to 40°C under stirring and keep the temperature for 2h Alkalinize chitosan. After the alkalization was completed, 3 mL of n-octane bromide was slowly added dropwise at the same reaction temperature, and the reaction was carried out at constant temperature for 6 hours. After the reaction was completed, 20 mL of methanol was added to the three-necked flask to wash out the product. Use dilute hydrochloric acid with a mass fraction of 10% to adjust the pH of the system to 7, add 10mL of acetone as a precipitating agent, let it stand for precipitation an...

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Abstract

The invention relates to a comb-shaped polymer oil-in-water type crude oil demulsifying agent and a preparation method thereof. A structural general formula of the demulsifying agent is shown as a formula I. The preparation method of the demulsifying agent comprises the following steps: 1) performing alkylation modification on chitosan to obtain alkylated chitosan; 2) performing carboxyalkylationmodification on the alkylated chitosan to obtain alkylated carboxyl alkyl chitosan; 3) performing acrylic esterification modification on methoxypolyethylene glycol terminal hydroxyl to obtain acrylated methoxypolyethylene glycol; 4) enabling modified methoxypolyethylene glycol to react with alkylated carboxyl alkyl chitosan to obtain methoxypolyethylene glycol grafted alkylated carboxyl alkyl chitosan. According to the comb-shaped polymer oil-in-water type crude oil demulsifying agent disclosed by the invention, chitosan natural polymer compounds are utilized as raw materials; the raw materials have the advantages of wide sources, natural performance, no toxin, good biocompatibility, degradation and the like; carboxyalkyl, alkyl and a polyether side chain are introduced to a molecular chain of the chitosan; by means of controlling positions and substitution degrees of all substituent groups, a series of high-efficiency demulsifying agents suitable for oil-in-water (O / W) type emulsion can be prepared.

Description

technical field [0001] The invention relates to a comb-shaped polymer oil-in-water crude oil demulsifier and a preparation method thereof, belonging to the field of petrochemical industry. Background technique [0002] In the process of oilfield exploitation, with the implementation of oil recovery technologies such as steam flooding, surfactant, polymer and ASP flooding, the water content of crude oil emulsion increases, and the stability is enhanced, making it more difficult to break the emulsion of crude oil. The formation of emulsion will bring a series of serious hazards to the exploitation, transportation and processing of petroleum. The emulsification of crude oil and water will make the extraction of crude oil more difficult; when transporting water-containing crude oil by pipeline or tanker truck, it will increase the load of the pump and the transportation cost. Therefore, it is very necessary to desalt and dehydrate the crude oil emulsion before crude oil transpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04C08G81/00
CPCC08G81/00C10G33/04C10G2300/1033
Inventor 吕仁亮张成梁成夏婷李泽钦王存文徐彩丽张俊峰马家玉
Owner WUHAN INSTITUTE OF TECHNOLOGY
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