Method for separating oil and water of and circularly using degreasant tank-liquor using ultrafiltration technology

A technology of oil-water separation and degreasing tank, which is applied in the direction of separation method, filtration separation, immiscible liquid separation, etc. It can solve the problems of short tank liquid renewal cycle, affecting the working environment, and poor oil-water separation effect, so as to improve the efficiency of oil-water separation , The effect of purifying the working environment
CN1500541AInactive Publication Date: 2004-06-02FAW GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FAW GROUP
Publication Date
2004-06-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

In the ultrafiltration of degreasing tank liquid for oil-water separation and reusing, ultrafiltration membrane in certain specification is selected to intercept emulsified oil part of the tank liquid based on the size of the oil drops. Contaminated degreasing tank liquid is first processed in the deposition tank and circulating tank, then pre-filtered in the pre-filter and finally ultrafiltered in the ultrafilter before returning to degreasing tank for re-use. The intercepted liquid in the ultrafilter may be returned via pipeline to the pre-filter for re-filtering. The present invention has also one ultrafiltration membrane cleaning tank, cleaning liquid is injected via pipeline and the effluent is made to return into the pre-filter. The present invention has the features of saving in energy, saving in water, clean work environment, high oil-water separating rate, etc. The tank liquid has an updating period as long as three months.
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Description

(1) Technical field

[0001] The invention relates to a method for oil-water separation of degreasing bath liquid, in particular to a method for oil-water separation and recycling of degreasing bath liquid by using ultrafiltration technology. (2) Background technology

[0002] At present, the methods of high temperature demulsification and overflow separation are mostly used for the oil-water separation of the degreasing bath. First, overflow the degreasing tank liquid with high oil content in the upper part of the degreasing tank into the oil-water separation treatment tank, heat it to 90-100 °C to break the emulsion, and then scrape the floating oil in the upper part out of the treatment tank by means of an electrically controlled mechanical scraper , the liquid in the lower part flows back into the degreasing tank to complete a cycle. This kind of oil-water separation method has poor oil-water separation effect and high energy consumption due to the need for high temperatu...

Claims

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