RECOVERY OF GASES FROM GASEOUS MIXTURES

摘要

A process and and arrangement for converting air into a gaseous mixture enriched with nitrogen includes passing a first stream of air through an adsorber which preferentially adsorbs oxygen from the admitted first stream and thereby discharges a second stream of a gaseous mixture having a higher proportion of nitrogen as compared with the first stream. Control means are positioned in the second stream to measure the oxygen content of the continuously discharging second stream and terminates the discharge of the same when the oxygen content thereof exceeds a predetermined value. Residual amounts of gaseous mixture are then evacuated from the adsorber. An additional adsorber is connected with the first-mentioned adsorber to form a first stage with each adsorber being alternately charged with air in a cyclical operation. Additional stages are connected in series so that the effluent nitrogen-enriched gaseous mixture can be further enriched to a final desired value.