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Method and device for recovering and purifying dichloromethane-white oil mixed solution

A dichloromethane and mixed liquid technology, which is applied in the field of recovery and purification of dichloromethane-white oil mixed liquid, can solve the problems of easy discoloration, high energy consumption of rectification, high operating temperature, etc., to prevent white oil from changing color and operating temperature The effect of low and high safety performance

Active Publication Date: 2019-12-20
QINGDAO HSJ ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the recovery of dichloromethane-white oil mixture is generally carried out by simple rectification. Dichloromethane has a low boiling point and is first distilled out. In addition, the operating temperature of the current process technology is generally high, and the white oil is heated repeatedly during the recovery process, which is prone to discoloration, and the discolored white oil needs to be adsorbed and decolorized by clay, which will produce a large amount of solid waste. Waste white clay, difficult to handle, causing environmental pollution

Method used

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  • Method and device for recovering and purifying dichloromethane-white oil mixed solution
  • Method and device for recovering and purifying dichloromethane-white oil mixed solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] like figure 1 As shown, the device for recovering and purifying the dichloromethane-white oil mixture includes a double-effect evaporator, a rectifying tower 1 and a gas stripping system 2;

[0046] The double-effect evaporator includes a first-effect evaporator 3 and a second-effect evaporator 4, and the first-effect evaporator 3 includes a first-effect dichloromethane-white oil mixed liquid inlet, a first-effect dichloromethane steam outlet and a first-effect concentrate outlet, and a second-effect evaporator Effect evaporator 4 comprises two-effect methylene chloride-white oil mixed liquid inlet, one-effect methylene chloride steam inlet, two-effect methylene chloride steam outlet, one-effect methylene chloride condensate outlet and two-effect concentrated liquid outlet;

[0047] The rectifying tower 1 comprises a concentrated liquid inlet, a tower top outlet and a tower bottom outlet;

[0048] Air stripping system 2 comprises crude white oil inlet and white oil out...

Embodiment 2

[0064] A device for recovering and purifying dichloromethane-white oil mixture, including a double-effect evaporator, a rectification tower 1 and an air stripping system 2;

[0065] The double-effect evaporator includes a first-effect evaporator 3 and a second-effect evaporator 4, and the first-effect evaporator 3 includes a first-effect dichloromethane-white oil mixed liquid inlet, a first-effect dichloromethane steam outlet and a first-effect concentrate outlet, and a second-effect evaporator Effect evaporator 4 comprises two-effect methylene chloride-white oil mixed liquid inlet, one-effect methylene chloride steam inlet, two-effect methylene chloride steam outlet, one-effect methylene chloride condensate outlet and two-effect concentrated liquid outlet;

[0066] The rectifying tower 1 comprises a concentrated liquid inlet, a tower top outlet and a tower bottom outlet;

[0067] Air stripping system 2 comprises crude white oil inlet and white oil outlet;

[0068] The first-...

Embodiment 3

[0081] A device for recovering and purifying dichloromethane-white oil mixture, including a double-effect evaporator, a rectification tower 1 and an air stripping system 2;

[0082] The double-effect evaporator includes a first-effect evaporator 3 and a second-effect evaporator 4, and the first-effect evaporator 3 includes a first-effect dichloromethane-white oil mixed liquid inlet, a first-effect dichloromethane steam outlet and a first-effect concentrate outlet, and a second-effect evaporator Effect evaporator 4 comprises two-effect methylene chloride-white oil mixed liquid inlet, one-effect methylene chloride steam inlet, two-effect methylene chloride steam outlet, one-effect methylene chloride condensate outlet and two-effect concentrated liquid outlet;

[0083] The rectifying tower 1 comprises a concentrated liquid inlet, a tower top outlet and a tower bottom outlet;

[0084] Air stripping system 2 comprises crude white oil inlet and white oil outlet;

[0085] The first-...

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Abstract

The invention provides a method and device for recycling and purifying a dichloromethane-white oil mixed solution, and relates to the field of lithium battery diaphragms. The method for recovering andpurifying the dichloromethane-white oil mixed solution comprises the following steps: feeding a dichloromethane-white oil mixed solution into a double-effect evaporator, performing separation in a first effect evaporator to obtain first-effect dichloromethane steam and a first-effect concentrated solution, and performing separation in a second-effect evaporator to obtain second-effect dichloromethane steam and a second-effect concentrated solution; enabling the first-effect dichloromethane steam as a heat source to enter a second-effect evaporator, heating the dichloromethane-white oil mixedsolution fed into the second-effect evaporator, condensing the first-effect dichloromethane steam, discharging the condensed first-effect dichloromethane steam out of the second-effect evaporator, andrectifying the first-effect concentrated solution and the second-effect concentrated solution to obtain residual dichloromethane and crude white oil; and performing gas stripping on the crude white oil to obtain white oil. The device for recovering and purifying the dichloromethane-white oil mixed solution comprises a double-effect evaporator, a rectifying tower and a gas stripping system. The device for recycling and purifying the dichloromethane-white oil mixed solution is high in stability, low in process operation temperature and low in energy consumption.

Description

technical field [0001] The invention relates to the field of lithium battery separators, in particular to a method and device for recovering and purifying a dichloromethane-white oil mixture. Background technique [0002] The lithium battery separator industry usually uses white oil as a porogen in the wet film-making process. The white oil inside the separator is eluted by dichloromethane solvent during the multi-stage extraction process, thereby forming a microporous structure. The content of white oil in the mixed liquid discharged from the diaphragm production line is generally below 5 wt%, and the content of methylene chloride is above 95 wt%. [0003] At present, the recovery of dichloromethane-white oil mixture is generally carried out by simple rectification. Dichloromethane has a low boiling point and is first distilled out. In addition, the operating temperature of the current process technology is generally high, and the white oil is heated repeatedly during the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/00C07C19/03C07C17/38C07C17/383
CPCC07C17/38C07C17/383C10G7/00C10G2300/201C10G2400/14C07C19/03
Inventor 郅立鹏柴灵芝王文超孟庆茂刘涛王士刚纪麟肯刘升
Owner QINGDAO HSJ ENVIRONMENTAL PROTECTION TECH CO LTD