Base oildeemulsifier in high performance

A kind of crude oil demulsifier, high-efficiency technology, applied in the direction of hydrocarbon oil dehydration/demulsification, petroleum industry, etc., can solve the problems of large dosage, poor demulsification effect of chemical flooding production fluid, poor adaptability, etc., and meet the operating conditions Mild, excellent demulsification effect, production cost reduction effect

Active Publication Date: 2007-10-10
DAQING HUAYING CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another unfavorable factor is the energy consumption in the demulsification process, which leads to an increase in the cost of production fluid treatment year by year, and a corresponding increase in the treatment cost of crude oil production fluid
The most direct and effective measure to reduce the energy consumption of oil collection and dehydration is to reduce the temperature of oil collection and dehydration. However, one of the technical difficulties is the problem of demulsification in oil-water separation. Problems such as rising oil content in water phase after emulsion
At present, the domestically produced demulsifiers have four shortcomings. First, they have poor adaptability and can only demulsify specific oil and water. Second, the demulsification effect on chemical flooding production fluid is not good, and the dosage is large
Third, the production cost of demulsifiers is very high, which has reached the level of meager profit
Fourth, the low temperature demulsification performance is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Efficient crude oil demulsifier of the present invention is to make by following method:

[0016] a. Acidification of cornstarch: add 5-15 parts of solvent and 5-15 parts of cornstarch in parts by weight to the reactor under stirring, slowly add 20%-80% protonic acid based on the weight of cornstarch, and continue stirring 1 to 4 hours;

[0017] b. Graft copolymerization: Add 2 to 8 parts of stearyl alcohol polyoxyethylene polyoxypropylene ether to the reactant obtained in step a, and continue to add 2 to 10 parts of solvent, and heat to reflux for 2 to 8 hours;

[0018] c. Neutralization: add sodium hydroxide solution to the reactant obtained in step b under stirring until the pH value reaches 6.5-8.0, and continue the reaction for 1-3 hours to obtain a high-efficiency crude oil demulsifier;

[0019] Above-mentioned protic acid is sulfuric acid, phosphoric acid or hydrochloric acid;

[0020] The above-mentioned solvent is methanol, ethanol, isopropanol, tert-butanol,...

Embodiment 2

[0022] Efficient crude oil demulsifier of the present invention is to make by following method:

[0023] a. Acidification of cornstarch: Add 8-12 parts of solvent and 8-12 parts of cornstarch in parts by weight to the reactor under stirring, slowly add 40%-60% protonic acid based on the weight of cornstarch, and continue stirring 2 to 3 hours;

[0024] b. Graft copolymerization: Add 3 to 6 parts of stearyl alcohol polyoxyethylene polyoxypropylene ether to the reactant obtained in step a, and continue to add 4 to 8 parts of solvent, and heat and reflux for 3 to 6 hours;

[0025] c. Neutralization: add sodium hydroxide solution to the reactant obtained in step b under stirring until the pH value reaches 6.5-8.0, and continue the reaction for 1-3 hours to obtain a high-efficiency crude oil demulsifier;

[0026] Above-mentioned protic acid is sulfuric acid or phosphoric acid;

[0027] The above-mentioned solvent is methanol, ethanol, isopropanol or tert-butanol.

Embodiment 3

[0029] Efficient crude oil demulsifier of the present invention is to make by following method:

[0030] a. Acidification of cornstarch: add 9 to 10 parts of solvent and 9 to 10 parts of cornstarch by weight to the reaction kettle under stirring, slowly add 45%-55% protonic acid based on the weight of cornstarch, and continue stirring 2 to 3 hours;

[0031] b. Graft copolymerization: Add 4 to 5 parts of stearyl alcohol polyoxyethylene polyoxypropylene ether to the reactant obtained in step a, and continue to add 5 to 6 parts of solvent, and heat and reflux for 4 to 5 hours;

[0032] c. Neutralization: add sodium hydroxide solution to the reactant obtained in step b under stirring until the pH value reaches 6.5-8.0, and continue the reaction for 1-3 hours to obtain a high-efficiency crude oil demulsifier;

[0033] Above-mentioned protonic acid is sulfuric acid;

[0034] Above-mentioned solvent is methanol or ethanol.

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PUM

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Abstract

This invention discloses a method for synthesizing a high-efficiency crude oil demulsifier from cornstarch and conventional polyether demulsifier by graft copolymerization. The method comprises: (1) adding solvent and cornstarch into a reaction kettle with a stirrer, slowly adding proton acid (20-80 wt.% of cornstarch), and stirring for 1-4 h; (2) adding polyether demulsifier and solvent, and refluxing under heating for 2-8 h; (3) adding NaOH solution for neutralization, ending NaOH addition when the pH value is 6.5-8.0, and reacting for 1-3 h until the solution is transparent. The demulsifier has such advantages as simple process, mild operation conditions, wide applications, and good demulsification effect.

Description

technical field [0001] The invention relates to a demulsifier, in particular to a high-efficiency crude oil demulsifier synthesized by grafting and modifying cornstarch as the main raw material and polyether demulsifier. Background technique [0002] During the extraction of crude oil, due to the contact between crude oil and water and the effect of the natural emulsifier in crude oil, crude oil and water form a stable emulsion. Especially in the current tertiary oil recovery, the injection of a large amount of chemicals and surfactants has seriously emulsified crude oil. In order to meet the requirements of crude oil export, it is necessary to break the emulsion of crude oil to separate crude oil from water. Compared with the demulsifier process in the early stage of crude oil production, the demulsification process of chemical flooding production fluid is more complicated and difficult at present. With the application of chemical flooding in major domestic oilfields, mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/00C08B31/00C08G81/00
Inventor 李宣京白术波高丽丽
Owner DAQING HUAYING CHEM IND
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