Multi-branched chain silazane-containing crude oil demulsifier and preparation method thereof

A technology of crude oil demulsifier and silazane, which is applied in the field of multi-branched silazane-containing crude oil demulsifier and its preparation, can solve the problem of unsatisfactory dehydration effect of polyether demulsifier, complex demulsification and dehydration of emulsified crude oil, and dehydration cost Improvement and other issues, to achieve the effect of improving the demulsification effect, dehydration effect, and increasing the molecular weight

Active Publication Date: 2018-01-26
JURONG NINGWU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water content in the crude oil produced in many oilfields increases year by year, and various residual chemical agents in the crude oil after sewage reinjection make the demulsification and dehydration of emulsified crude oil more complicated and difficult. The dehydration effect of ordinary polyether demulsifiers is not ideal. Increasing the dosage is still difficult to solve the problem, which leads to the increase of the dehydration cost of the crude oil emulsion and the reduction of the dehydration effect, and also has many adverse effects on the crude oil transportation process and the oil refining in the refinery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Add 0.5 parts of hexamethyldisilazane and 0.5 parts of sodium hydroxide into a reactor equipped with a stirring and condensing device, heat up to raise the temperature, feed 7.5 parts of ethylene oxide, control the temperature at 115°C and the pressure at Under the pressure of 0.4MPa, fully react for 8 hours, vacuum for 30 minutes, under the same reaction conditions, 10 parts of propylene oxide are passed in order to react for 8 hours and vacuum for 30 minutes, and 7.5 parts of ethylene oxide are passed for reaction for 8 hours and vacuum for 30 minutes. Triblock product A.

[0022] 2) Add product A, 1 part of pentaerythronic acid and 1 part of p-toluenesulfonic acid into a reactor equipped with a stirring and water separation and reflux device, and react under stirring conditions at 100°C for 2 hours to obtain the target demulsifier.

Embodiment 2

[0024] 1) Add 10 parts of hexamethyldisilazane and 2 parts of sodium hydroxide into a reactor equipped with a stirring and condensing device, heat up to raise the temperature, feed 20 parts of ethylene oxide, control the temperature at 130°C and the pressure at Under 0.15MPa, fully react for 15 hours, vacuum for 30 minutes, then pass 35 parts of propylene oxide to react for 15 hours and vacuum for 30 minutes under the same reaction conditions, and pass in 20 parts of ethylene oxide for 15 hours to react in vacuum for 30 minutes. Triblock product A.

[0025] 2) Add product A, 5 parts of crosslinking agent and 2 parts of p-toluenesulfonic acid into a reactor equipped with a stirring and water separation and reflux device, and react under stirring conditions at 130°C for 4 hours to obtain the target demulsifier.

Embodiment 3

[0027] 1) Add 16 parts of hexamethyldisilazane and 4 parts of sodium hydroxide into a reactor equipped with a stirring and condensing device, heat up to raise the temperature, feed 30 parts of ethylene oxide, control the temperature at 145°C and the pressure at Under 0.4MPa, fully react for 20 hours, vacuum for 30 minutes, then pass 55 parts of propylene oxide to react for 20 hours and vacuum for 30 minutes under the same reaction conditions, and then pass 30 parts of ethylene oxide to react for 20 hours and vacuum for 30 minutes. Triblock product A.

[0028] 2) Add product A, 10 parts of crosslinking agent and 2 parts of p-toluenesulfonic acid into a reactor equipped with a stirring and water separation and reflux device, and react under stirring conditions at 145° C. for 6 hours to obtain the target demulsifier.

[0029] When the demulsifier prepared in the above examples is used in an amount of 20 mg / L, the dehydration rate can reach more than 95%.

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PUM

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Abstract

The invention discloses a multi-branched chain silazane-containing crude oil demulsifier and a preparation method thereof. The multi-branched chain silazane-containing crude oil demulsifier comprises,by weight, 0.5-16 portions of a silazane-containing initiator, 10-55 portions of epoxypropane, 15-60 portions of ethylene oxide, 1-10 portions of a crosslinking agent, 0.5-4 portions of a basic catalyst and 1-2 portions of an accelerator. The preparation method utilizes a two-step method comprising carrying out stepwise polymerization on the silazane-containing initiator with ethylene oxide and epoxypropane and carrying out crosslinking with the crosslinking agent. The demulsifier has the characteristics of small use amount, good dehydration effect, low demulsification temperature, clear separated water and wide use range.

Description

technical field [0001] The invention relates to a demulsifier, in particular to a multi-branched silazane-containing crude oil demulsifier and a preparation method thereof. Background technique [0002] Demulsifiers are indispensable chemical additives for all oil fields. At present, polyether demulsifiers are mainly used in China. Most of these demulsifiers use active hydrogen-containing compounds as initiators. Carry out anionic ring-opening polymerization reaction to prepare polyoxyethylene polyoxypropylene ether demulsifier. However, the water content in the crude oil produced in many oilfields increases year by year, and various residual chemical agents in the crude oil after sewage reinjection make the demulsification and dehydration of emulsified crude oil more complicated and difficult. The dehydration effect of ordinary polyether demulsifiers is not ideal. Increasing the dosage is still difficult to solve the problem, which leads to the increase of the dehydration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04C08G77/54
Inventor 应军李怀阁翟洪金陈杰倪小明
Owner JURONG NINGWU CHEM
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