Patent ID: 8404024

Claim:
A process for removing at least one impurity from a crude NF 3 gas stream in a system having at least two vessels each containing an adsorber, comprising steps of: flowing the crude NF 3 gas stream through the first adsorber in the first vessel to selectively adsorb the at least one impurity; redirecting the flow of the crude NF 3 gas stream through the second adsorber in the second vessel after a predetermined time or when effluent of the first adsorber reaches a predetermined level of the at least one impurity; flowing a recovery purge gas through the first adsorber to selectively desorb co-adsorbed NF 3 from the first adsorber; discontinuing the flow of the recovery purge gas when a predetermined time or when effluent of the recovery purge gas reaches a predetermined level of the at least one impurity or a predetermined percentage of co-adsorbed NF 3 ; flowing a regeneration purge gas through the first adsorber to purge adsorbed at least one impurity and remaining co-adsorbed NF 3 from the first adsorber; and discontinuing the flow of the regeneration purge gas.