Patent ID: 6537348
Filing Date: 2003-03-25
Classification: B01D,B01J,Y02C,Y10S

Abstract:
A method of adsorptive separation of carbon dioxide from a gaseous mixture comprising carbon dioxide and gases less polar than carbon dioxide comprising contacting said gaseous mixture with a zeolite adsorbent whereby said carbon dioxide is adsorbed by said zeolite adsorbent to be thereby separated, wherein said carbon dioxide present in said gaseous mixture as contacted with said zeolite adsorbent has a partial pressure in the range of 0.1 to 50 mmHg, and said zeolite adsorbent is a shaped product which is comprised of at least 95%, as determined on the basis of the moisture equilibrium adsorption value, of a low-silica type X zeolite having an SiO2/Al2O3 molar ratio in the range of 1.9 to 2.1, and has an average crush strength of at least 1.0 kgf as measured on particles of the shaped product having a particle diameter in the range of 1.4 to 1.7 mm prepared for crush strength measurement.