Organic waste gas desorption process

Abstract

The invention discloses an organic waste desorption process, which comprises the following steps of: (1) adsorbing: cooling and filtering organic waste gas, and collecting into an adsorber through a gas collecting system for adsorbing; (2) desorbing: desorbing the organic waste gas through thermal nitrogen gas to obtain desorbed mixed gas; and (3) recovering: recycling the desorbed gas, wherein during adsorption, the temperature of the thermal nitrogen gas is 110-160 DEG C; and the adsorber is a fixed bed adsorber which takes active carbon particles as an adsorbent. Due to the adoption of the process for desorbing, the desorption efficiency is increased, the thermal nitrogen gas desorption efficiency can be up to 98 percent, the problems of steam desorption acid corrosion is solved, and the service life of equipment is greatly prolonged; the water content of a mixed solution is low, so that treatment is not required, the mixed solution can be directly applied to production, and the economic benefit of the recovering system is increased; nitrogen gas desorption is adopted, so that the service life of an adsorption material in a reaction container is prolonged, the production cost is lowered, and manpower and materials are saved; and meanwhile, the problem that solvents which are miscible and slightly soluble in water such as alcohols, ketones, esters and the like cannot be directly recovered through steam desorption is solved. The organic waste gas desorption process is suitable for the industries of printing, light industry, coating, chemistry, electronics and the like.

Description

technical field [0001] The invention relates to a process for treating waste gas, in particular to an organic waste gas desorption process. Background technique [0002] At present, the method of treating industrial waste gas mostly adopts the desorption process. The desorption process commonly used in China and the world mostly uses steam desorption at 120°C, that is, the water vapor is input to absorb the organic waste gas. The reaction vessel is used to desorb the organic waste gas with water vapor, and then turn the organic waste gas into liquid by cooling to realize the process of repeated utilization. The following problems exist in this desorption method: (1) Due to the existence of liquid water, A large amount of mixed liquid containing acidic substances is very corrosive to the equipment; (2) Due to the high water content of the mixed liquid, it is not easy to reuse, such as steam desorption cannot directly recover miscible alcohols, ketones, esters, etc. and the r...

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Problems solved by technology

[0002] At present, the method of treating industrial waste gas mostly adopts the desorption process. The desorption process commonly used in my country and the world mostly uses steam desorption at 120°C, that is, the water vapor is input to absorb the organic waste gas. The reaction vessel is used to desorb the organic waste gas with water vapor, and then turn the organic waste gas into liquid by cooling to realize the process of repeated utilization. The following problems exist in this desorption method: (1) Due to the existence of liquid water, A large amount of mixed liquid containing acidic substances is very corrosive to the equipment; (2) Due to the high water content of the mixed liquid, it is not easy to reuse, such as steam desorption cannot directly recover miscible alcohols, ketones, esters, etc. and the recovery of solvents that are slightly soluble in water; (3) When the materials in the reaction tank are continuously desorbed by water vapor, the micropores on the surface are calcified by scale, which reduces the service life of the materials; (4) The acidic substances in the discharged water The content is high, it cannot be discharged directly, and the cost of reprocessing is high

[0003] Chinese invention patent CN101288820B discloses a "activated carbon fiber organic waste gas recovery method and system using nitrogen as a desorption medium", which uses activated carbon fiber as an adsorbent and hot nitrogen at 90-100°C as a desorption medium to recover organic waste gas Utilization, the service life of carbon fiber in the above method is shorter than that of other activated carbon adsorbents, and it needs to be activated regularly before it can be used again; in addition, when using 90-100 °C hot nitrogen as the desorption medium, its desorption efficiency is low, for some Organic waste gas with high boiling point cannot be desorbed, such as toluene, xylene and other gases in printing and dyeing, light industry, electronics, printing, coating and other industries, which make it stay on the adsorbent, thereby reducing the service life of the adsorbent , increasing the production cost

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