Complete purifying method for chemical industry waste gas

Abstract

The invention relates to a complete purifying method for chemical industry waste gas and relates to the technical field of industrial waste gas purification. The complete purifying method is characterized in that the chemical industry waste gas is subjected to acid removing reaction in water and processed by a monox drying agent, is further subjected to adsorbent purification with an activated carbon adsorbent, and finally is discharged through combustion; after the acid removing reaction, the drying agent process and the absorbent purification process, 60-70% of waste gas can be removed; in addition, the reaction is conducted in water with the water as a water seal, so that safety assurance can be increased, the rest about 30% of the waste gas can be removed through combustion, and finally the emitted gas conforms to the comprehensive emission standard of air pollutants. According to the invention, the purifying effect can reach 98%; the complete purifying method is a safer and more advanced method which aims to remove waste gas which consists of carbon, hydrogen and oxygen; the technological process is practical and feasible, the processing effect is stable and reliable, the overall distribution is based on the concrete situations, the operational management is convenient, and the investment cost is economical and reasonable.

Description

technical field [0001] The invention relates to the technical field of purification of industrial production waste gas. Background technique [0002] With the progress of large-scale chemical industrial production, the exhaust gas contains a variety of toxic and odorous gases, mainly including nylon acid, alkyd acid, phthalic anhydride, aldehydes, etc. Isobutyraldehyde, phthalic anhydride, nylon acid and the like are insoluble in water, but combustion produces CO and CO 2 . [0003] The currently widely used method is the adsorption method, and most of them use activated carbon to directly adsorb the exhausted gas. However, among these special gases, it is easy to catch fire through long-term friction with activated carbon, and the consequences are very serious. Moreover, the adsorption effect of activated carbon can reach 90% at the beginning of use, but after a short period of time, the adsorption effect of activated carbon drops to less than 50%, and frequent replaceme...

AI Technical Summary

Problems solved by technology

However, among these special gases, it is easy to catch fire through long-term friction with activated carbon, and the consequences are very serious.

Moreover, the adsorption effect of activated carbon can reach 90% at the initial stage of use, but after a short period of time, the adsorption effect of activated carbon drops to less than 50%, and frequent replacement is required

Therefore, this direct adsorption method makes the activated carbon equipment bulky and heavy, and also causes high operating costs.

[0004] At present, there is still a catalytic method, but its cost is also extremely high, and the processed product needs to be further processed, and it will fall into the cycle of processing.