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A kind of crude oil demulsifier and preparation method thereof

A technology of crude oil demulsifier and demulsifier, which is applied in chemical dehydration/demulsification, treatment of hydrocarbon oil, petroleum industry, etc. It can solve the problems of secondary pollution and poor environmental friendliness of demulsifier, and achieve a neat and strong oil-water interface. Competitive adsorption capacity, good effect of safe use

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 crude oil demulsifier and preparation method thereof
  • A kind of crude oil demulsifier and preparation method thereof
  • A kind of crude oil demulsifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Prepare the N-n-butyrylation carboxymethyl chitosan of polyethylene glycol monomethyl ether graft, concrete steps are as follows:

[0050] (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).

[0051] 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:

[0052] 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

[0057] Prepare the N-n-hexanoylated carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, the specific steps are as follows:

[0058] (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.

[0059] (2) Carboxymethylation of N-n-hexanoylated chitosan: get 1.128g A 6 Add 100mL of distilled water to CS in a 250mL three-neck flask, a...

Embodiment 3

[0063] Prepare the N-octanoyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, and the specific steps are as follows:

[0064] (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.

[0065] (2) Carboxymethylation of N-octanoyl chitosan: get 1.256g A 8 Add 100mL of distilled water to CS in a 25...

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Abstract

The invention relates to a novel high-efficiency crude oil demulsifying agent and a preparation method thereof. A structural general formula of the novel high-efficiency crude oil demulsifying agent is shown as a formula I. The preparation method of the demulsifying agent comprises the following steps: 1) performing acylation modification on chitosan to obtain N-acylation chitosan; 2) performing carboxyl alkylation modification on the N-acylation chitosan to obtain N-acylated carboxyl alkyl chitosan; 3) performing isocyanic esterification modification on methoxypolyethylene glycol terminal hydroxyl to obtain isocyanic esterification methoxypolyethylene glycol; 4) reacting modified methoxypolyethylene glycol with N-acylated carboxyl alkyl chitosan to obtain a target product of methoxypolyethylene glycol grafted N-acylated carboxyl alkyl chitosan. According to the novel high-efficiency crude oil demulsifying agent disclosed by the invention, chitosan natural polymer compound is utilizedas a raw material; the raw material has the advantages of wide sources, natural performance, no toxin, good biocompatibility, degradation and the like; carboxyalkyl, alkyl and a polyether side chain are guided into 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 novel high-efficiency 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...

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冯魏良徐汶张俊峰马家玉
Owner WUHAN INSTITUTE OF TECHNOLOGY
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