PRESSURE SWING ADSORPTION INTEGRATION IN STEAM CRACKING ETHYLENE PLANTS FOR IMPROVED HYDROGEN RECOVERY

摘要

A process is provided for increasing the recovery of high-purity hydrogen from a steam cracking process in situations where byproduct methane yield is high relative to hydrogen. After a hydrocarbon gas stream is sent through a cold box and demethanizer, a small proportion of methane is sent through a pressure swing adsorption unit separately from a gas stream that contains hydrogen to increase high-purity hydrogen recovery by about 6%.