Patent ID: 9168483
Filing Date: 2015-10-27
Classification: B01D,B01J,C01B,Y02C,Y02P

Abstract:
1. A method for performing a gas separation, comprising: contacting an adsorbent or membrane comprising DDR-type zeolite crystals with an input gas stream containing a first component and a second component to form a first gas stream enriched in the first component relative to the input gas stream; and collecting a second gas stream enriched in the second component relative to the input gas stream, wherein the DDR-type zeolite crystals are synthesized using a synthesis mixture having an alkali metal to silica ratio of at least about 0.01, the adsorbent being comprised of crystals with an alkali metal impurity content of about 0.05 wt % or less; wherein the DDR-type zeolite crystals as synthesized have an alkali metal impurity content of at least about 0.1 wt %, the alkali metal impurity content being reduced prior to contacting the adsorbent by exposing the DDR-type zeolite crystals to an alkali metal impurity removal process.