Device and method for low-temperature variable-pressure absorption of chloromethane in waste gas by using ionic liquid

A technology of ionic liquid and methyl chloride, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve secondary pollution and other problems, and achieve the effects of convenient operation, cost reduction, and simple process

Pending Publication Date: 2022-04-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

This technology reduces waste of resources and production costs, but there are still secondary pollution problems

Method used

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  • Device and method for low-temperature variable-pressure absorption of chloromethane in waste gas by using ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Using a single ionic liquid (take [EMIM][Ac] as an example)

[0039] The feed flow rate of waste gas containing chloromethane is 100kg / h, and the feed contains 5% (mass fraction) of chloromethane, 1% (mass fraction) of water, 0.1% dimethyl ether (mass fraction), and the balance is nitrogen. The theoretical plate number of the gas absorption tower (T1) is 8, the feeding position of the waste gas containing chloromethane is the 8th block, and a single ionic liquid (taking [EMIM][Ac] as an example) is fed from the 8th block of the gas absorption tower (T1). Feeding at one plate position, the operating pressure and temperature of the gas absorption tower (T1) are 2.2atm and 30°C, respectively, the mass ratio of the ionic liquid to the waste gas containing chloromethane during the absorption process is 2:1, and the first flash tank The flash temperature of (S1) is 40°C, the operating pressure is 1atm, the flash temperature of the second flash tank (S2) is 40°C, and the operati...

Embodiment 2

[0041] Use mixed ionic liquids (take [EMIM][Ac]50%+[EMIM][BF4]50% as an example)

[0042] The feed flow rate of waste gas containing chloromethane is 100kg / h, and the feed contains 8% (mass fraction) of chloromethane, 1% (mass fraction) of water, 0.1% dimethyl ether (mass fraction), and the balance is nitrogen. The number of theoretical plates of the gas absorption tower (T1) is 10, the feeding position of the chloromethane waste gas is the 10th, and the mixed ionic liquid (based on [EMIM][Ac]50%+[EMIM][BF4]50% Example) Feed from the first plate position of the gas absorption tower (T1), the operating pressure and temperature of the gas absorption tower (T1) are 2.5atm and 30°C, the feed quality of the ionic liquid and the waste gas containing chloromethane during the absorption process The ratio is 2:1, the flash temperature of the first flash tank (S1) is 50 °C, the operating pressure is 1 atm, the flash temperature of the second flash tank (S2) is 40 °C, the operating press...

Embodiment 3

[0044] Use a mixture of ionic liquid and water (take [EMIM][Ac]90%+water 10% as an example)

[0045] The feed flow rate of the waste gas containing chloromethane is 100kg / h, the feed contains 6% (mass fraction) of chloromethane, 1% (mass fraction) of water, 0.1% dimethyl ether (mass fraction), and the balance is nitrogen. The number of theoretical plates of the gas absorption tower (T1) is 9, the feeding position of the waste gas containing chloromethane is the 9th, the operating pressure and temperature of the gas absorption tower (T1) are 2atm and 30°C respectively, and the mixture of ionic liquid and water ( Taking [EMIM][Ac]90%+water 10% as an example) feeds from the first plate position of the gas absorption tower (T1), and the feed mass ratio of ionic liquid to chloromethane waste gas in the absorption process is 3: 1. The flash temperature of the first flash tank (S1) is 40°C, the operating pressure is 1 atm, the flash temperature of the second flash tank (S2) is 50°C, ...

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Abstract

The invention discloses a device and a method for low-temperature variable-pressure absorption of chloromethane in waste gas by ionic liquid, and belongs to the technical field of fine chemical separation and purification. An ionic liquid absorbent is adopted, through a low-temperature pressure swing absorption method, chloromethane-containing waste gas enters a gas absorption tower (T1) from the tower bottom, the absorbent enters the gas absorption tower (T1) from the tower top, the bottom material flow of the gas absorption tower (T1) is connected with the middle part of a first flash tank (S1), and air containing trace chloromethane is emptied from the top of the first flash tank (S1); an absorbent rich in chloromethane gas enters the middle of the second flash tank (S2) from the bottom of the first flash tank (S1), the product chloromethane gas is extracted from the top of the second flash tank (S2), and the absorbent is extracted from the bottom of the second flash tank (S2), subjected to heat exchange through the heat exchanger (H1) and then conveyed back to the top of the gas absorption tower (T1) through the conveying pump (P1). The method has the characteristics of low energy consumption, short flow, low equipment cost, high absorption capacity, recyclable absorbent and the like.

Description

technical field [0001] The invention relates to a device and method for absorbing methyl chloride in exhaust gas with low-temperature variable pressure of ionic liquid. The ionic liquid absorbent can be a single ionic liquid, a mixed ionic liquid or a mixture of ionic liquids and water. The invention belongs to the technical field of fine chemical separation and purification. Background technique [0002] The unorganized discharge of chlorine-containing waste gas produced by industries such as medicine and lithium battery separators has threatened human life and health and the biological ecological environment. Traditional technologies such as activated carbon fiber adsorption have problems such as low adsorption capacity and inevitable secondary pollution and wastewater discharge. At present, in the production process of methylchlorosilane and methane chloride, a large amount of methyl chloride is contained in the non-condensable gas of the condenser at the top of the sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/18
CPCB01D53/1425B01D53/1418B01D53/1487B01D53/1493B01D53/18B01D2252/30B01D2257/2064
Inventor 雷志刚李国选刘清华桂成敏张傑
Owner BEIJING UNIV OF CHEM TECH
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