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A kind of modified chitosan crude oil demulsifier and preparation method thereof

A crude oil demulsifier, chitosan technology, applied in the direction of chemical dehydration/demulsification, processing hydrocarbon oil, petroleum industry, etc., can solve the problems of poor environmental friendliness and secondary pollution of demulsifier

Active Publication Date: 2020-10-23
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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  • A kind of modified chitosan crude oil demulsifier and preparation method thereof
  • A kind of modified chitosan crude oil demulsifier and preparation method thereof
  • A kind of modified chitosan crude oil demulsifier 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 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

[0050] The preparation of the hexyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0051] (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 modified chitosan type crude oil demulsifier and a preparation method thereof. The structural general formula of the demulsifier is shown as formula I; the preparation method comprises the following steps: 1) performing alkylation modification on chitosan to obtain alkylated chitosan; 2) performing epoxidation modification on the terminal hydroxyl of polyethylene glycolmonomethyl ether to obtain epoxidized polyethylene glycol monomethyl ether; 3) enabling the modified polyethylene glycol monomethyl ether to react with the alkylated chitosan to obtain polyethylene glycol monomethyl ether grafted alkylated chitosan; 4) performing carboxyl alkylation modification on the polyethylene glycol monomethyl ether grafted alkylated chitosan to obtain polyethylene glycol monomethyl ether grafted alkylated carboxyl alkyl chitosan. With chitosan type natural high-molecular compounds as raw materials, the modified chitosan type crude oil demulsifier provided by the invention has the advantages of wide source, natural property, no toxicity, high biocompatibility, degradability and the like. A series of efficient demulsifiers suitable for oil-in-water (O / W) type emulsionare obtained by introducing carboxyl alkyl, alkyl and polyether side chain to a chitosan molecular chain and controlling the position and substitution degree of each substituent.

Description

technical field [0001] The invention relates to a modified chitosan 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 transportation and pro...

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 吕仁亮张成梁成王存文徐彩丽徐汶王为国覃远航冯魏良
Owner WUHAN INSTITUTE OF TECHNOLOGY
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