Process for cleaning air by adsorption on barium exchanged zeolite

摘要

A a gas flow containing impurities is purified by using barium exchanged zeolite X which adsorbs propane, ethylene and nitrous oxide in addition to carbon dioxide by a pressure swing adsorption (PSA) or temperature swung adsorption (TSA) process. The purification of a gas flow containing impurities including propane, ethylene and nitrous oxide comprises: (1) contacting the gas is with a zeolite X adsorbent containing barium ions; (2) adsorbing the impurities on the adsorbent. The zeolite X contains at least 30% of barium cations, preferably at least 70% and more preferably 75-98% of barium cations. An Independent claim is also included for the adsorbent used in the process.