Recovery treatment device and method for waste gas containing N, N-dimethylacetamide

A dimethylacetamide and exhaust gas recovery technology, which is applied in the fields of environmental protection and exhaust gas treatment, can solve the problems of inability to recycle DMAC, inability to treat DMAC exhaust gas, high energy consumption of evaporation, etc., achieve sufficient heat recovery and utilization, and meet exhaust emission standards , the effect of high product purity

Pending Publication Date: 2021-03-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above method is mainly a destruction method, and the DMAC cannot be recycled and reused, resulting in a waste of resources
[0005] CN109320432A discloses evaporation equipment for the recovery and purification of low-concentration dimethylacetamide, including a four-effect falling film evaporation system, a rectification tower system, an evaporation DMAC system and a vacuum system, and the four-effect falling film evaporation system includes a four-effect evaporation system unit, condensing unit, pipeline unit, feeding unit and discharging unit, the four-effect evaporation unit includes a first-effect heater, a first-effect separator, a second-effect heater, a second-effect separator, A three-effect heater, a three-effect separator, a four-effect heater and a four-effect separator, the condensing unit includes a condensed water tank, a condenser, a condensed water pipeline connecting the condensed water tank and the condenser, and the rectifying tower system Including a dehydration unit and a deacidification unit, the evaporative DMAC system includes an evaporation unit, but this equipment is aimed at waste water containing DMAC, and the energy consumption of evaporation is high
However, this method is also aimed at the recovery and treatment of DMAC waste liquid, and it uses adsorption for DMAC waste gas, which cannot treat DMAC waste gas with high temperature and large concentration fluctuations.
[0007] It can be seen from this that the existing treatment of waste containing N,N-dimethylacetamide is generally waste liquid treatment, and there are problems such as high energy consumption and complicated process.

Method used

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  • Recovery treatment device and method for waste gas containing N, N-dimethylacetamide
  • Recovery treatment device and method for waste gas containing N, N-dimethylacetamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] This embodiment provides a waste gas recovery and treatment device containing N,N-dimethylacetamide, the waste gas recovery and treatment device includes an absorption unit, a dehydration unit and a rectification unit connected in sequence;

[0153] The absorption unit includes a first heat exchange device, a second heat exchange device, a first phase separation device and an absorption device connected in sequence.

[0154] The absorption device includes an absorption tower; the upper part of the absorption tower is provided with a tray, and the lower part is provided with a filler; the bottom side of the absorption device is provided with a waste gas inlet; the top side of the absorption device is provided with an absorbent inlet, and the middle part is provided with a The absorbent circulation inlet, the top is provided with an absorption gas phase outlet, and the bottom is provided with an absorption liquid phase outlet; the first phase separation device is provided ...

Embodiment 2

[0159] This embodiment provides a waste gas recovery and treatment device containing N,N-dimethylacetamide, except that "the absorption gas phase outlet is not connected to the heat exchange medium inlet of the first heat exchange device" in the waste gas recovery treatment device " outside, all the other are identical with embodiment 1.

Embodiment 3

[0161] This embodiment provides a waste gas recovery and treatment device containing N,N-dimethylacetamide, except that "the cooling medium inlet of the second cooling device is not connected with the first heat exchange device. Cooling medium outlet is connected " except, all the other are identical with embodiment 1.

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Abstract

The invention provides a recovery and treatment device for waste gas containing N, N-dimethyl acetamide. The recovery and treatment device for the waste gas comprises an absorption unit, a dehydrationunit and a refining unit which are connected in sequence, wherein the absorption unit comprises a heat exchange device, a phase separation device and an absorption device which are connected in sequence, absorption, dehydration and refining sections are combined, and the heat exchange device and the phase separation device are arranged before absorption, so that organic matters such as N, N-dimethyl acetamide in a gas phase can be transferred into a liquid phase; and aiming at the problem of organic waste gas treatment in the industries of adhesive tape film production, leather making and thelike, recycling treatment of the N, N-dimethyl acetamide in waste gas is realized, and the method utilizing the device adopts two-stage heat exchange and phase separation and then performs absorption, so that the absorption efficiency is high, and the controllability of operation conditions and process technologies is high.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to the technical field of waste gas treatment, and in particular to a waste gas recovery and treatment device and method containing N,N-dimethylacetamide. Background technique [0002] In the tape production process, a large amount of N,N-dimethylacetamide (DMAC) is used as a chemical raw material and an organic solvent. These DMAC solvents are heated and vaporized and mixed with air to form organic waste gas, which is widely used in petroleum, chemical, pharmaceutical or pesticide industries. Waste gas and waste water containing DMAC are highly toxic and harmful to the environment. Therefore, it is necessary to quickly and efficiently recycle and reuse DMAC. [0003] At present, molecular sieve rotor adsorption, combustion, biochemical method, supercritical water oxidation method, photocatalytic oxidation, physicochemical method or chemical method are often used f...

Claims

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Application Information

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IPC IPC(8): B01D53/18B01D53/14C07C231/24C07C233/05
CPCB01D53/1418B01D53/1487B01D53/18B01D2257/40C07C231/24C07C233/05
Inventor何林李鑫钢肖颖王哲王泰隋红郑成功
OwnerTIANJIN UNIV