Device and method for treating waste gas containing high-and medium-concentration benzene

A treatment method and technology of treatment device, which are applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of low technical efficiency, high cost, secondary pollution, etc., and achieve obvious economic benefits, reduce air resistance, waste gas and other problems. Deal with thorough effects

Active Publication Date: 2016-07-13
NJTECH ENVIRONMENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: aiming at the problems of low efficiency, high cost, and secondary pollution of the current treatment technology containing medium and high concentrations of benzene, it provides an efficient and low-cost treatment of waste gas containing medium and high concentrations of benzene method and device

Method used

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  • Device and method for treating waste gas containing high-and medium-concentration benzene

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Experimental program
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Effect test

Embodiment 1

[0031] A complete set of treatment equipment for waste gas containing medium and high concentrations of benzene, such as figure 1As shown, it includes an air distribution system, an absorption system and a circulation system; the air distribution system is provided with an air inlet 1 and a grille air distribution net 2, and the grille air distribution net 2 is installed above the air inlet 1; the absorption system is arranged from bottom to top Set random packing 3, first-level sprinkler head 4, structured packing 5, second-level sprinkler head 6, and mist eliminator 7, wherein first-level sprinkler head 4 is installed on random packing 3, and structured packing 5 is installed on The first-level spray head 4 is installed on the second-level spray head 6, and the second-level spray head 6 is installed on the structured packing 5, and finally the entrained absorption liquid is removed through the demister 7; the circulation system is equipped with a submerged pump 8, an absorpti...

Embodiment 2

[0038] The intake concentration of benzene exhaust gas is 40g / m 3 , The absorbent A used is 1,4 butanediol (BDO). The exhaust gas enters from the bottom of the absorption tower, and passes through the grid gas distribution area, random packing, structured packing and demister in sequence. The empty tower coefficient of the spray tower is 4m 3 / (m 2 , h), the spray density is 0.8m / s, the height-to-diameter ratio of random packing is 1.8, and the height-to-diameter ratio of structured packing is 0.8; the removal rate of benzene reaches more than 99%.

[0039] The saturated solvent A is desorbed in the desorption tank, and the 80°C fraction is taken separately to obtain benzene with a product purity of 95%. The desorbed 1,4-butanediol (BDO) is recycled for spray absorption.

Embodiment 3

[0041] Containing toluene waste gas inlet concentration is 18g / m 3 , The absorbent A used is sulfolane. The waste gas enters from the bottom of the absorption tower, and passes through the grid gas distribution area, random packing, structured packing and demister in sequence, among which, the empty tower coefficient of the spray tower is 5m 3 / (m 2 , h), the spray density is 1.5m / s, the ratio of random packing height to tower diameter is 1.5, and the ratio of structured packing height to tower diameter is 1.5; the removal rate of toluene reaches 97%.

[0042] The saturated solvent A is desorbed in the desorption kettle, and the 111°C fraction is taken separately to obtain toluene with a product purity of 94%. The desorbed sulfolane is recycled for spray absorption.

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Abstract

The invention belongs to the field of waste gas treatment and relates to a device and a method for treating waste gas containing high-and medium-concentration benzene.An absorption device comprises a gas distribution system, an absorbing system and a circulating system.By integration advantages of random packing and structured packing, appropriate absorbents are selected, and a multi-stage absorbing mode is adopted, so that the benzene can be absorbed efficiently, and the absorbents can be recycled after saturation.In addition, the method has the advantages of simplicity in operation, low treatment cost, high added value of recovered products, low device investment and the like.

Description

technical field [0001] The invention belongs to the field of waste gas treatment, and relates to a method and a device for treating waste gas containing medium and high concentrations of benzene. Background technique [0002] A large amount of harmful benzene series (benzene, toluene, xylene, chlorobenzene, etc.) volatiles are produced in petrochemical, paint decoration, printing industry, and various chemical production processes. These volatile organic compounds have a strong odor and have caused great harm to the environment, the growth of animals and plants, and human health. [0003] At present, in terms of treatment process, condensation method, combustion method, absorption method, adsorption method, plasma method, etc. are mainly used. Among them, the condensation method has low treatment efficiency and is often used in conjunction with other processes; the combustion method is a relatively thorough treatment process. , but there is a certain risk in the high-concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18
CPCB01D53/1425B01D53/1443B01D53/1487B01D53/1493B01D53/18B01D2252/20B01D2252/202B01D2257/7027
Inventor 徐炎华于鹏李溪鲍乾龙
Owner NJTECH ENVIRONMENT TECH CO LTD
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