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A kind of polyethylene glycol monomethyl ether grafted alkylated carboxyalkyl chitosan crude oil demulsifier and its preparation method

A technology of polyethylene glycol monomethyl ether and alkylated carboxyalkyl shell, which is used in chemical dehydration/demulsification, treatment of hydrocarbon oil, petroleum industry, etc., can solve secondary pollution and poor environmental friendliness of demulsifier and other problems, to achieve the effect of neat oil-water interface, strong competitive adsorption capacity, and good use safety.

Active Publication Date: 2020-11-27
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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  • A kind of polyethylene glycol monomethyl ether grafted alkylated carboxyalkyl chitosan crude oil demulsifier and its preparation method
  • A kind of polyethylene glycol monomethyl ether grafted alkylated carboxyalkyl chitosan crude oil demulsifier and its preparation method
  • A kind of polyethylene glycol monomethyl ether grafted alkylated carboxyalkyl chitosan crude oil demulsifier and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The preparation of the butyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0043] (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 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 then filter, wash the...

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

[0056] The preparation of the octyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0057] (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 polyethylene glycol monomethyl ether grafted alkylated carboxyalkyl chitosan type crude oil demulsifier and a preparation method thereof. The structure general formula of the demulsifier is as shown in the formula I, and the preparation method of the demulsifier comprises the followings: (1) chitosan is subjected to alkylation modification, so as to obtain alkylated chitosan; (2) the alkylated chitosan is subjected to carboxyalkylation modification, so as to obtain alkylated carboxyalkyl chitosan; (3) terminal hydroxyl of polyethylene glycol monomethyl ether is subjected to esterification modification, so as to obtain esterified polyethylene glycol monomethyl ether; and (4) the modified polyethylene glycol monomethyl ether and the alkylated carboxyalkyl chitosanare in reaction so as to obtain the polyethylene glycol monomethyl ether grafted alkylated carboxyalkyl chitosan. The chitosan type natural high-molecular compounds are used as raw materials, therefore, the crude oil demulsifier has the advantages of wide raw material sources, being natural, non-toxicity, good biocompatibility and being degradable. Carboxyalkyl, alkyl and polyether side chains areintroduced to chitosan molecular chains, and by controlling the positions and degree of substitution of the substituents, a series of efficient demulsifiers suitable for O / W type emulsion can be obtained.

Description

technical field [0001] The invention relates to an alkylated carboxyalkyl chitosan crude oil demulsifier grafted with polyethylene glycol monomethyl ether and a preparation method thereof, belonging to the field of petrochemical industry. Background technique [0002] In the process of oilfield development, with the implementation of oil recovery technologies such as steam flooding, surfactants, polymers and ternary composite flooding, the water content of crude oil emulsion increases, and the stability is enhanced, and the difficulty of crude oil demulsification increases. The formation of emulsions will bring a series of serious hazards to oil extraction, transportation and processing. The emulsification of crude oil and water will increase the difficulty of crude oil extraction; when the water-containing crude oil is transported by pipelines or oil tankers, the load of the pump and the transportation cost will be increased. Therefore, it is necessary to desalinate and de...

Claims

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Application Information

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Patent Type & Authority Patents(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覃远航汪铁林
Owner WUHAN INSTITUTE OF TECHNOLOGY
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