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A kind of crude oil demulsifier and preparation method thereof

A crude oil demulsifier and demulsifier technology, which is applied in the direction of dehydration/demulsification by chemical methods, can solve the problems of secondary pollution and poor environmental friendliness of demulsifiers, and achieves good use safety, strong competitive adsorption capacity, and high interface. active effect

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 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

[0043] Prepare the N-n-butyrylation carboxymethyl chitosan of polyethylene glycol monomethyl ether graft, concrete steps are as follows:

[0044] (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).

[0045] 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:

[0046] 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

[0051] Prepare the N-n-butyrylation carboxymethyl chitosan of polyethylene glycol monomethyl ether graft, concrete steps are as follows:

[0052] (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.

[0053] (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, and wait ...

Embodiment 3

[0057] Prepare the N-n-butyrylation carboxymethyl chitosan of polyethylene glycol monomethyl ether graft, concrete steps are as follows:

[0058] (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.

[0059] (2) Carboxymethylation of N-octanoyl chitosan: get 1.256g A 8Add 100mL of distilled water to CS in a 250mL thr...

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Abstract

The invention relates to a crude oil demulsifying agent and a preparation method thereof. The structural general formula of the crude oil demulsifying agent is as shown in a formula I and the preparation method of the crude oil demulsifying agent comprises the following steps: 1) carrying out acylation modification on chitosan to obtain N-acylated chitosan; 2) carrying out carboxyalkylation modification on the N-acylated chitosan to obtain N-acylated carboxyalkyl chitosan; 3) carrying out halogenation modification on terminal hydroxyl groups of methoxypolyethylene glycol to obtain halogenatedmethoxypolyethylene glycol; and 4) allowing the modified methoxypolyethylene glycol to react with the N-acylated carboxyalkyl chitosan, so as to obtain a target product methoxypolyethylene glycol grafted N-acylated carboxyalkyl chitosan. The chitosan natural polymer compound is used as a raw material and the crude oil demulsifying agent has a wide source and is natural, non-toxic, good in biocompatibility, degradable and the like. A carboxyalkyl group, an acyl group and a polyether side chain are introduced into the chitosan molecular chain, the position and the degree of substitution of the substituent groups are controlled to obtain a series of high-efficiency demulsifying agents suitable for oil-in-water(O / W) emulsion.

Description

technical field [0001] The invention relates to a 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 processing. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G33/04C08G81/00
CPCC08G81/00C10G33/04
Inventor 吕仁亮夏婷张成梁成王存文徐彩丽覃远航汪铁林冯魏良
Owner WUHAN INSTITUTE OF TECHNOLOGY
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