USE OF CALCIUM EXCHANGED X-TYPE ZEOLITE FOR IMPROVEMENT OF REFINERY OFF-GAS PRESSURE SWING ADSORPTION

摘要

The invention uses a calcium exchanged zeolite molecular sieve adsorbent in a pressure swing adsorption process to purify hydrogen from refinery off-gas streams. The use of this adsorbent provides for an improvement in removal of methane and allows for faster cycle times and the processing of a higher volume of hydrogen for a given size adsorption bed.