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Polyether grafted polysaccharides crude oil demulsifier and preparation method thereof

A crude oil demulsifier and polysaccharide technology, used in chemical dehydration/demulsification, petroleum industry, treatment of hydrocarbon oil, etc., can solve the problems of poor environmental friendliness and secondary pollution of demulsifier, and achieve strong competitive adsorption capacity , Good safety and high interface activity

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 polysaccharides crude oil demulsifier and preparation method thereof
  • Polyether grafted polysaccharides crude oil demulsifier and preparation method thereof
  • Polyether grafted polysaccharides crude oil demulsifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Prepare the N-n-butyrylated carboxymethyl chitosan of polyethylene glycol monomethyl ether graft, concrete steps are as follows:

[0041] (1) Synthesis of N-acylated chitosan: 2g chitosan (CS) (M w =179.17kDa, degree of deacetylation >95%, viscosity 100-200mPa·s) dissolved in 40mL of 10% acetic acid aqueous solution, added 160mL of methanol to dilute, added 5.9mmol of n-butyric anhydride under stirring conditions, and stood at room temperature for 24h Add 260mL of acetone as precipitating agent, precipitate is washed three times respectively with methanol and ether, and freeze-dried to obtain white water-soluble solid N-n-butyrylated chitosan (A 4 CS).

[0042] Wherein the consumption of n-butyric anhydride is 0.5 times of the amount of amino substance contained in chitosan, and concrete calculation method is as follows:

[0043] The sugar unit of chitosan is glucosamine residue, and the molecular weight of this residue (sugar unit of chitosan) is 161, and the amount ...

Embodiment 2

[0048] Prepare the N-n-hexanoylated carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, the specific steps are as follows:

[0049] (1) Synthesis of N-acylated chitosan: 2g chitosan (CS) (M w =179.17kDa, deacetylation degree>95%, viscosity 100~200mPa·s) was dissolved in 40mL 10% acetic acid aqueous solution, added 160mL methanol to dilute, under stirring condition, add n-hexanoic anhydride 5.9mmol according to the amount of amino substance 0.5 times, in Placed at room temperature for 24 hours, 260 mL of acetone was added as a precipitant, the precipitate was washed three times with methanol and ether, and freeze-dried to obtain a white water-soluble solid N-n-hexanoylated chitosan (A 6 CS). Wherein the calculation method of n-hexanoic anhydride consumption is described in step (1) with reference to embodiment 1.

[0050] (2) Synthesis of formylated polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =1900) 1.9g (1mmol) d...

Embodiment 3

[0054] Prepare the N-n-octanoylation carboxymethyl chitosan of polyethylene glycol monomethyl ether grafting, concrete steps are as follows:

[0055] (1) Synthesis of N-acylated chitosan: 2g chitosan (CS) (M w =179.17kDa, degree of deacetylation>95%, viscosity 100-200mPa·s) dissolved in 40mL of 10% acetic acid aqueous solution, added 160mL of methanol for dilution, and added 5.9mmol of n-octylic anhydride according to 0.5 times the amount of amino substances under stirring conditions, After standing at room temperature for 24 h, 260 mL of acetone was added as a precipitating agent, and the precipitate was washed three times with methanol and ether, and freeze-dried to obtain a white water-soluble solid N-octanoyl chitosan (A 8 CS). Wherein the calculating method of n-octanoic anhydride consumption is described with reference to step (1) among the embodiment 1.

[0056] (2) Synthesis of formylated polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether ...

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Abstract

The invention relates to a polyether grafted polysaccharides crude oil demulsifier and a preparation method thereof. A structure general formula of the demulsifier is as shown in formula I, and the preparation method thereof comprises the following steps: 1) performing acylation modification on chitosan, to obtain N-acylated chitosan; 2) performing aldehydes modification on a terminal hydroxyl ofmethoxypolyethylene glycol, to obtain aldehyde methoxypolyethylene glycol; 3) enabling the modified methoxypolyethylene glycol to react with N-acylated chitosan, to obtain methoxypolyethylene glycol grafted N-acylated chitosan; 4) performing carboxy alkylation modification on the methoxypolyethylene glycol grafted N-acylated chitosan, to obtain methoxypolyethylene glycol grafted N-acylated carboxyalkyl chitosan. The demulsifier is capable of using chitosan natural macromolecular compounds as a raw material, wide in source, natural, non-toxic, good in biocompatibility, and degradable. A carboxy alkyl, an acyl 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 polysaccharide 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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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马家玉吴再坤
Owner WUHAN INSTITUTE OF TECHNOLOGY
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