Pressure buildup technique in pressure swing adsorption process

Details Pressure buildup technique in pressure swing adsorption process Pressure buildup technique in pressure swing adsorption process

B - Operations, Transporting

01

D

183/24

B01D 53/02 (2006.01) B01D 53/047 (2006.01)

Patent

CA 1104068

ABSTRACT OF THE DISCLOSURE In a pressure swing adsorption process for the separation of gases comprising the steps of passing crude gas under a superatmospheric adsorption pressure through a drying bed of H2O-selective adsorbent to remove gaseous H2O and then passing resultant H2O-free gas sequentially throuqh a separate and distinct zeolite-containing adsorbent bed for the removal of low-boiling impurities and the further steps of pressure release, desorption and pressure buildup to adsorption pressure, the improvement in the pressure buildup step which comprises introducing an H2O- depleted gas obtained during said process to a point intermediate the drying bed and said zeolite-containing adsorbent bed and passing said H2O-depleted gas into the drying bed in a countercurrent direction to the flow of crude gas and into the zeolite-containing adsorbent bed in a cocurrent direction to the flow of crude gas, and continuing said passing of said H2O-depleted gas until the pressure buildup is at least 20% of the adsorption pressure.

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