Separation equipment for dichloromethane and white oil mixed liquid

Abstract

The invention relates to separation equipment for a dichloromethane and white oil mixed liquid. The separation equipment comprises a distillation system, a white oil treatment system and a dichloromethane treatment system, and the distillation system comprises a distillation tower, an evaporator and a gas-liquid separator; the white oil treatment system comprises an oil rectifier, a white oil cooler and a white oil collector; and the dichloromethane treatment system comprises a dichloromethane condenser, a water segregator and a dichloromethane collector. A falling-film evaporator is adopted,so the material retention time is short, the steam working pressure is low, the steam consumption is low, meanwhile, the evaporated white oil concentrate is low in temperature, light in color and luster and high in purity, after evaporated dichloromethane gas is subjected to gas-liquid separation, condensation and water separation, the content of white oil in dichloromethane is within 20 ppm, andafter white oil is rectified and cooled, the content of dichloromethane in finished white oil is within 80 ppm; and in addition, the separation equipment is simple in structure and convenient to implement.

Description

technical field [0001] The invention belongs to the field of gas-liquid separation, and in particular relates to a separation device for dichloromethane and white oil mixed liquid. Background technique [0002] At present, in the field of oil refining, dichloromethane and white oil need to be recovered in the production process of the wet lithium battery separator, among which white oil is mostly used as a pore-forming agent, and the white oil is extracted with dichloromethane after film formation. A mixture of dichloromethane and white oil was formed, containing 5% white oil and 95% dichloromethane. A large amount of white oil and dichloromethane are used in this process, so separating the mixed liquid to recover and recycle the dichloromethane and white oil is the key to reducing the production cost of lithium battery separators. [0003] Some domestic distillation methods are used to separate and purify dichloromethane and white oil. The light phase at the top of the tow...

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Problems solved by technology

[0003] Some domestic distillation methods are used to separate and purify dichloromethane and white oil. The light phase at the top of the tower is the separated dichloromethane, and the bottom liquid is the separated white oil. The main disadvantage is: it will make the mixed liquid Oxidation occurs in the light components, destroying the structure of the white oil, and the removal effect on trace water and other polar substances is not good. The high temperature of the gas will increase the condensation load of the condenser, resulting in an increase in the amount of circulating water, the temperature of the white oil is too high, the color of the white oil will deepen, and the amount of white clay will increase during decolorization, which will increase the production cost. The white oil content in the liquid is as high as 400ppm, and the methylene chloride content in the finished white oil is also as high as 500ppm

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