Activated carbon fiber organic solvent recovery novel technique using nitrogen as desorption medium

Abstract

The invention provides a novel organic gas processing technique, which expends the application area of activated carbon fiber adsorbent. The technique uses hot nitrogen as desorption medium, and recovers the enriched desorption gas in a cooling or absorption manner, thereby realizing zero-release of pollution. The nitrogen is replaced before heating-desorption, and the safe running of a recovery device can be guaranteed by using temperature and oxygen content on-line monitoring system to control the switch of a nitrogen safety valve. By using the hot nitrogen as the desorption medium, the problems of secondary pollution, corrosion and high running cost etc. generated during water vapor desorption in the traditional technique can be overcome, thereby improving the efficiency, prolonging the serving life and expanding using range, so that the technique has good application and popularization value.

Description

technical field [0001] The present invention relates to the recovery of high-boiling gaseous compounds such as vaporized compounds that are normally liquid from vaporous mixtures, and especially relates to the recovery of organic solvent-containing waste gases from printing, light industry, coating, chemical industry, electronics and other industries in the production process. Equipment and method for recovering and recycling various organic solvents. Background technique [0002] In the past, the activated carbon fiber solvent recovery process was mainly used in the recovery of toluene, xylene, cyclohexane, halogenated hydrocarbons and other organic substances that are difficult to dissolve in water. For example, Chinese patent ZL200510200344.8 discloses a new process for automatic recovery of industrial organic waste gas Chinese patent ZL02233407.6 discloses an activated carbon fiber waste gas adsorption and recovery device. The above patents all use the method of water va...

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Problems solved by technology

[0003] 1) Secondary discharge sewage, especially when recovering organic matter with high solubility, is difficult to treat, and the operation cost of using a rectification tower is high

[0004] 2) During desorption, a large amount of water vapor condenses in the activated carbon fiber adsorption layer. Although the dry wind blows, the water content of the activated carbon fiber is still high, which affects its adsorption performance and reduces the utilization rate.

[0005] 3) When the organic waste gas contains substances such as easily hydrolyzed substances or halogenated hydrocarbons, the equipment is easily corroded under the action of high-temperature water vapor, and there are many impurities in the recycled products

[0006] 4) When the working environment is poor, impurities such as dust entrained in the airflow will accumulate in the activated carbon fiber, and the activated carbon fiber will lose its activity under the effects of salting out and filling.

[0007] 5) For some occasions containing high boiling point substances, since the water vapor cannot be effectively desorbed, the adsorption rate of the above-mentioned process and device will drop a lot after a period of operation, and cannot operate normally

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