ENRICHING METHOD OF OXYGEN IN AIR BY VACUUM SWING ADSORPTION USING CA ZEOLITE A MOLECULAR SIEVE

摘要

PURPOSE: To reduce the energy consumption of a vacuum pump by packing several kinds of Ca zeolite A molecular sieves having different adsorption characteristics into the adsorbers of a VSA apparatus. CONSTITUTION: The air is passed via a fan G and a valve 11A into the adsorber A and an oxygen-enriched gas is taken out as a product via a valve 14A and a fan R. Valves 12A, 13A are held closed. Simultaneously the adsorber B is evacuated via a valve 12B and the vacuum pump V. Valves 11B, 13B, 14B are held closed. Simultaneously the oxygen which is the product is packed into the adsorber C via valves 15, 13C. Valves 11C, 12C, 14C are held closed. These three step processes are cyclically operated with the three adsorbers A, B, C. The raw gas intake side, i.e., bottom layers, of the respective adsorbers A, B, C consist of the Ca zeolite A having the lowest adsorption capacity with respect to the nitrogen and the layers of the Ca zeolite A having the highest adsorption with respect to the nitrogen are made to exist at the oxygen product ends of the absorbers.