Patent ID: 6955711
Filing Date: 2005-10-18
Classification: B01D

Abstract:
1. A method for separating gas in which at least two main gas components are separated and recovered from a gas mixture containing the at least two main gas components by a pressure swing adsorption method, wherein the method comprises the steps of: pressurizing the gas mixture; alternately repeating a step in which a first main gas component is separated as a first gas product using a first adsorbent, which does not readily adsorb the first main gas component and which easily adsorbs a second main gas component, and a step, in which the second main gas component is separated as a second gas product using a second adsorbent, which easily adsorbs the first main gas component and which does not readily adsorb the second main gas component, and thereby the first and second gas products are yielded simultaneously from the gas mixture, wherein during the step in which the first and second main gas components are separated as the first and second gas products, the first and second gas products are stored in product tanks; and after the step in which the first and second main gas components are separated as the first and second gas products, the first and second gas products, which are stored in the product tanks, are used for purging the first and second adsorbents, a gas adsorbed by the at least one of the first or second adsorbent is joined to the gas mixture, and the gas mixture is air.