Nitrogen purging-assisted organic exhaust gas recycling method through pressure swing adsorption of adsorbent resin

A technology of nitrogen purging and resin adsorption, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of low regeneration efficiency, achieve the effects of small footprint, avoid side reactions, and easy regeneration

Active Publication Date: 2014-10-22
NANJING UNIV
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Problems solved by technology

[0008] Aiming at the problem that the regeneration efficiency of the existing adsorption material is low due to the strong adsorption effect of the micropores when the pressure swing adsorption process adsorbs low-concentration VOCs, the present invention provides a method for recovering organic waste gas by nitrogen purge-assisted adsorption resin pressure swing adsorption , using macroporous adsorption resin as the adsorbent, and assisting room temperature nitrogen purge during vacuum desorption (regeneration process of non-vacuum desorption and sequential desorption with nitrogen), can significantly improve the desorption efficiency when adsorbing low-concentration VOCs, so that The working adsorption capacity of the adsorbent is significantly increased

Method used

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  • Nitrogen purging-assisted organic exhaust gas recycling method through pressure swing adsorption of adsorbent resin

Examples

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Effect test

Embodiment 1

[0032] The main parameters for the treatment of ethyl acetate waste gas are: the air volume of the induced draft fan is 80CMH, and the intake concentration of ethyl acetate is 5g / m 3 , the intake air temperature is normal temperature, and the pressure is normal pressure. The diameter of the adsorber is DN=180mm, and the adsorbent is AMBERLITE TM For XAD4 resin, the filling height is H=300mm, the adsorption time is 90min, the vacuum desorption vacuum pumping time is 20min, and nitrogen is flushed every 5min for 1min while vacuuming, and the condenser uses 5°C frozen brine. The content of ethyl acetate in the exhaust gas after treatment is about 150mg / m 3 , 9.3Kg of ethyl acetate was recovered in 24h, and the recovery rate was 96.9%.

Embodiment 2

[0034] The desorption conditions in Example 1 were changed to vacuuming by a single vacuum pump without nitrogen purging, and other conditions remained unchanged. The content of ethyl acetate in the exhaust gas after treatment is about 730mg / m 3 , 8.2Kg of ethyl acetate was recovered in 24h, and the recovery rate was 85.4%.

Embodiment 3

[0036] Change the ethyl acetate gas in embodiment 1 to 5g / m 3 Toluene gas, other conditions remain unchanged. The content of toluene in the tail gas after treatment is about 170mg / m 3 , 9.48Kg of ethyl acetate was recovered in 24h, and the recovery rate was 98.8%.

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Abstract

The invention discloses a nitrogen purging-assisted organic exhaust gas recycling method through the pressure swing adsorption of adsorbent resin. The organic exhaust gas recycling method comprises the following steps: (1) adsorption, namely performing adsorption when exhaust gas including volatile organic compounds (VOCs) enters an adsorber filled with the macroporous adsorption resin by a gas collection system; (2) desorption, namely vacuumizing the adsorbent resin in the adsorber and purging the adsorbent resin by using nitrogen in an auxiliary manner to desorb the adsorbed VOCs from the adsorbent resin to obtain the desorbed gas; and (3) recycling, namely condensing or absorbing the desorbed gas to recycle the VOCs. The adsorbent adopted by the method disclosed by the invention is the macroporous adsorption resin, the surface of the macroporous adsorption resin has no catalytic performance and has the characteristics of being easy to regenerate, high in mechanical strength, great in volumetric adsorption capacity and the like. A adsorption technique assisted by nitrogen purging in vacuum at normal temperature is high in adsorption efficiency and has the very excellent recycling effect on VOCs gas which can be easily oxidized and hydrolyzed or is high in solubility.

Description

technical field [0001] The invention relates to a method for treating and recovering waste gas with an adsorption resin, in particular to a method for using a high molecular polymer-adsorption resin to recycle and utilize organic waste gas produced in the production process of chemical industry, spraying and other industries. Background technique [0002] Organic solvents are widely used in industrial production, such as ketones, esters, alcohols, ethers, halogenated alkanes, etc. are widely used as organic solvents in chemical, pesticide, pharmaceutical and other industries. During the production process, organic waste gas will be directly discharged due to volatilization. The direct emission of volatile organic compounds (VOCs) will not only cause waste of resources, but also cause a series of problems such as health, environment and safety. Therefore, the work of recovering VOCs has great social significance. [0003] Adsorption is one of the mainstream technologies for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047
Inventor 龙超何宏磊贾李娟吴柳彦李爱民
Owner NANJING UNIV
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