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Polyether grafted oil-in-water type crude oil demulsifier and preparation method thereof

A crude oil demulsifier and oil-in-water type technology, which is applied in chemical dehydration/demulsification, petroleum industry, hydrocarbon oil treatment, etc., can solve the problems of poor environmental friendliness and secondary pollution of demulsifiers, and achieve strong competitive adsorption High performance, neat oil-water interface, and good safety in use

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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  • Polyether grafted oil-in-water type crude oil demulsifier and preparation method thereof
  • Polyether grafted oil-in-water type crude oil demulsifier and preparation method thereof
  • Polyether grafted oil-in-water type crude oil demulsifier and preparation method thereof

Examples

Experimental program
Comparison scheme
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) Synthesis of formylated polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =5000) 5g (1mmol) dissolved in 2mL chloroform, keep the reaction in a nitrogen environment, add 1.1mL (10mmol) acetic anhydride and 30mL anhydrous dimethyl sulfoxide at room temperature under constant stirring, raise the temperature to 35°C, and react at constant temperature for 15h . After the reaction was completed, the reaction solution was added to 400 mL of anhydrous ether, and the obtained precipitate was dissolved in chloroform and then recrystallized with ether solution (repeat this step once), and then vacuum-dried at room temperature for 24 h to obtain the formylated polyethylene glycol mono methyl ether.

[0044] (2) Synthesis of chitosan grafted with polyethylene glycol monomethyl ether: accurately weigh 1...

Embodiment 2

[0048] The preparation of the hexyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0049] (1) Synthesis of formylated polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =1900) 1.9g (1mmol) dissolved in 2mL chloroform, keep the reaction in a nitrogen atmosphere, add 1.1mL (10mmol) acetic anhydride and 30mL anhydrous dimethyl sulfoxide at room temperature under constant stirring, raise the temperature to 35°C, and react at a constant temperature 15h. After the reaction was completed, the reaction solution was added to 400 mL of anhydrous ether, and the obtained precipitate was dissolved in chloroform and then recrystallized with ether solution (repeat this step once), and then vacuum-dried at room temperature for 24 h to obtain the formylated polyethylene glycol mono methyl ether;

[0050] (2) Synthesis of chitosan grafted with polyethylene glycol monomethyl ether: accurately weigh 1.0...

Embodiment 3

[0054] The preparation of the octyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0055] (1) Synthesis of formylated polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =750) 0.75g (1mmol) dissolved in 2mL chloroform, keep the reaction in a nitrogen environment, add 1.1mL (10mmol) acetic anhydride and 30mL anhydrous dimethyl sulfoxide under constant stirring at room temperature, raise the temperature to 35°C, and react at a constant temperature 15h. After the reaction was completed, the reaction solution was added to 400 mL of anhydrous ether, and the obtained precipitate was dissolved in chloroform and then recrystallized with ether solution (repeat this step once), and then vacuum-dried at room temperature for 24 h to obtain the formylated polyethylene glycol mono methyl ether;

[0056] (2) Synthesis of octylcarboxymethyl chitosan grafted with polyethylene glycol monomethyl ether: ...

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Abstract

The invention relates to a polyether grafted oil-in-water type crude oil demulsifier and a preparation method thereof. A structure general formula of the demulsifier is as shown in formula I, and thepreparation method thereof comprises the following steps: 1) performing aldehydes modification on a terminal hydroxyl of methoxypolyethylene glycol; 2) enabling the modified methoxypolyethylene glycolto react with chitosan, to obtain methoxypolyethylene glycol grafted chitosan; 3) performing alkylation modification on the methoxypolyethylene glycol grafted chitosan; and 4) performing carboxy alkylation modification on methoxypolyethylene glycol grafted alkylation chitosan, to obtain methoxypolyethylene glycol grafted alkylation carboxy alkyl chitosan. The demulsifier is capable of using chitosan natural macromolecular compounds as a raw material, and has the advantages of wide source, nature, non-toxicity, good biocompatibility, degradation and the like. A carboxy alkyl, an alkyl and a polyether side chain are introduced into a chitosan molecular chain, and through controlling a position and a substitution degree of each substituent group, a series of the efficient demulsifiers suitable for oil-in-water (O / W) emulsion is obtained.

Description

technical field [0001] The invention relates to a polyether grafted 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 transport...

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 吕仁亮张成梁成王存文徐彩丽陈苏芳王为国覃远航冯魏良
Owner WUHAN INSTITUTE OF TECHNOLOGY
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