Detoxication of nitrose gases formed in the production of adipic acid: The two-stage catalytic cleaning process

Abstract

A two-stage process was developed for the catalytic cleaning of the nitrose gases formed in the production of adipic acid. The process involves the decomposition of N2O over a Co-ZSM-5-type catalyst and the reduction of NOx with ammonia over a V2O5/Al2O3 catalyst. The proposed process provides for the cleaning of the effluent gases from N2O and NOx at an efficiency of over 99% and has the advantage of natural gas economy over the thermal process. The Co-ZSM-5-type zeolite was used to make an N2O decomposition catalyst characterized by high moisture resistance. The kinetic characteristics of the process were determined, and hydrothermal endurance tests conducted with the catalysts (Co-ZSM-5 and V2O5/Al2O3) were recommended for the process. Technical and design parameters were established for the catalytic reactors forming part of the system for the cleaning of the effluent gases in the production of adipic acid.