Preparation method of oilfield demulsifier by utilizing waste grease

A waste oil and demulsifier technology, which is applied in the direction of dehydration/demulsification by chemical methods, can solve the problems of unsatisfactory dehydration effect of polyether demulsifiers, complicated demulsification and dehydration of emulsified crude oil, and reduced dehydration effect, and achieves ideal results. , less epoxide, and clear water

Active Publication Date: 2012-01-18
JURONG NINGWU CHEM
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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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Embodiment Construction

[0016] The following further describes the present invention through specific embodiments, but the embodiments are not a limitation of the present invention.

[0017] A method for preparing an oil field demulsifier using waste oil and fat includes the following steps:

[0018] Add 1000 grams of waste grease (recovered waste oil) into the reactor, heat it up, control to vacuum at 110°C for 2 hours, then add 90 grams of acetic acid and 20 grams of sulfuric acid, stir at 75°C for 1 hour, and then at 75°C Add 450 grams of hydrogen peroxide to the reactor and stir for 3 hours, then add 800 grams of ethylenediamine, react at 150°C for 6 hours, remove unreacted substances under reduced pressure to obtain modified waste grease;

[0019] Add 100 grams of the modified waste grease prepared into the reactor, then add 10 grams of potassium hydroxide to the reactor, heat it up, and pass in 500 grams of ethylene oxide, control the temperature at 170°C, and maintain the pressure at 0.3 Below MPa, ...

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Abstract

The invention discloses a preparation method of an oilfield demulsifier by utilizing waste grease, which comprises the following steps that: the waste grease is used as a raw material, and is reacted with ethylene diamine after being modified, an andepoxide is introduced in the presence of catalyst to obtain a polyether demulsifier; polycarboxylic acid is reacted with the polyether demulsifier byself-crosslinking; and finally, the resultant product and polymerized aluminum chloride are compounded to obtain the novel demulsifier. Compared with the preparation method of the ordinary polyether demulsifier, the preparation method of the demulsifier has lower epoxide consumption, lower cost, and changes the waste grease into valuables. The prepared demulsifier has ideal demulsification and dehydration effects for crude oil from an oilfield, and the dehydrated water is clear and less.

Description

Technical field [0001] The invention relates to a method for preparing a demulsifier, in particular to a method for preparing an oilfield demulsifier by using waste oil. Background technique [0002] Demulsifiers are indispensable chemical additives in all oilfields. At present, polyether demulsifiers are mainly used in China. Most of these demulsifiers use active hydrogen compounds as initiators and react with olefin oxide under the action of alkali metal catalysts. Carry out anionic ring-opening polymerization reaction to prepare polyoxyethylene polyoxypropylene ether demulsifier. However, the water content of crude oil produced in many oilfields is increasing year by year. The various residual chemical agents in 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, w...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C10G33/04C08G65/26C08J3/24
Inventor应珏翟洪金郑磊倪小明陈杰应军蔡敏俊于文超徐华丽
OwnerJURONG NINGWU CHEM