Solvent absorption method and device for vinyl chloride rectification tail gas

A technology of vinyl chloride and solvent method, which is applied in the field of vinyl chloride rectification tail gas solvent method absorption, which can solve the problems of production shutdown, production load reduction, vinyl chloride rectification tail gas emission and large vinyl chloride monomer, and achieve low cost, The effect of simple process and convenient operation of the device

Active Publication Date: 2021-12-03
XINJIANG ZHONGTAI CHEM FUKANG ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a solvent-based absorption method and device for vinyl chloride rectification tail gas, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that enterprises have large emissions of vinyl chloride rectification tail gas in the existing vinyl chloride production process. Impurities are easily produced in vinyl chloride monomer, so the production load has to be reduced or production shutdown, and the problem of adding supporting pressure swing adsorption devices

Method used

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  • Solvent absorption method and device for vinyl chloride rectification tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: as attached figure 1 As shown, the method for absorbing vinyl chloride rectification tail gas solvent method is carried out according to the following steps: the first step, the absorbent refined ethylene dichloride enters the absorbent cooler 1, utilizes frozen brine to cool the refined dichloroethane, and refines the dichloroethane. Ethyl chloride is cooled to -5°C to -15°C and then enters the absorption tower 2; in the second step, the tail gas from vinyl chloride rectification enters the absorption tower 2, and the refined dichloroethane in the absorption tower 2 continuously absorbs the tail gas from vinyl chloride rectification A part of the refined dichloroethane liquid that has absorbed the tail gas of vinyl chloride rectification is discharged from the bottom of the absorption tower 2 and enters the tower cooler 4, and the refined dichloroethane that has not entered the tower cooler 4 and absorbed the tail gas of vinyl chloride rectification The a...

Embodiment 2

[0016] Example 2: as attached figure 1 As shown, the device for implementing the solvent method absorption method for vinyl chloride rectification tail gas includes an absorbent cooler 1, an absorption tower 2, a tower top condensation cooler 3, a tower kettle cooler 4, and the first inlet at the bottom of the absorbent cooler 1 The absorbent feed pipeline 5 is fixedly connected, the second inlet at the bottom of the absorbent cooler 1 is fixedly connected with the first frozen brine supply pipeline 6, and the first outlet at the top of the absorbent cooler 1 is connected with the first inlet at the upper part of the absorption tower 2 The absorbent discharge pipeline 7 is fixedly connected, the second outlet at the top of the absorbent cooler 1 is fixedly connected with the first frozen brine return water pipeline 8, the middle inlet of the absorption tower 2 is connected with the vinyl chloride rectification tail gas pipeline 9, and the absorption tower 2 A top condensing co...

Embodiment 3

[0017] Embodiment 3: as attached figure 1 As shown, as an optimization of the above embodiment, a feed pump 19 for the tower cooler is fixedly installed on the feed line 17 of the tower cooler.

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Abstract

The invention relates to the technical field of tail gas treatment, and relates to a solvent-based absorption method and device for vinyl chloride rectification tail gas. The solvent-based absorption method for vinyl chloride rectification tail gas uses vinyl chloride rectification tail gas as raw material gas and refines dichloroethane As an absorbent, through the absorbent cooler, absorption tower, tower top condensing cooler, and tower reactor condenser, refined dichloroethane is used to absorb vinyl chloride rectification tail gas, reducing the tail gas flow rate, vinyl chloride content in tail gas, vinyl chloride The impurity content in the monomer enables the tail gas of vinyl chloride rectification to meet the discharge standard. The invention has simple process, convenient device operation, realizes tail gas absorption treatment and resource recycling, and has the characteristics of safety, low cost, simplicity and high efficiency.

Description

technical field [0001] The invention relates to the technical field of tail gas treatment, and relates to a solvent-based absorption method and device for vinyl chloride rectification tail gas. Background technique [0002] The production of polyvinyl chloride resin by calcium carbide method is the main production process of polyvinyl chloride resin in my country. At present, the total production capacity of polyvinyl chloride in China is 25 million tons per year, and the production capacity of calcium carbide method is 19.25 million tons, accounting for nearly 80%. The calcium carbide method uses calcium carbide as raw material to produce acetylene, acetylene and hydrogen chloride as raw materials to produce vinyl chloride monomer (VCM), and VCM is a production method for synthesizing polyvinyl chloride resin through polymerization. In the production process of vinyl chloride, low boiling substances are discharged from the top of the rectification low boiling tower. After c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14B01D53/18
CPCB01D53/1412B01D53/1487B01D53/1493B01D53/18B01D2252/205B01D2257/2064
Inventor 杨秀玲岳欣白生军姬红王博王小龙陈顺文张廷佑娄胜杰陈祥波
Owner XINJIANG ZHONGTAI CHEM FUKANG ENERGY CO LTD
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