Abstract: A method is disclosed for separating a multicomponent gas mixture comprising at least three components into three product streams by use of adsorbent membrane zones operating in series. Each product is enriched in a different component based upon the relative strength of adsorption of each component on the adsorbent material. A non-permeate primary component product is obtained by the selective adsorption and permeation through the adsorbent membranes of secondary components which are more strongly adsorbed than the primary components in the gas mixture. Two or more permeate streams enriched in the more strongly adsorbed components are withdrawn from the membrane zones as individual secondary products, each of which contains a different component distribution determined by the relative strength of adsorption of the secondary components on the adsorbent material.
Type:
Grant
Filed:
July 28, 1993
Date of Patent:
July 26, 1994
Assignee:
Air Products and Chemicals, Inc.
Inventors:
Madhukar B. Rao, Shivaji Sircar, Joseph M. Abrardo, William F. Baade
Abstract: Aromatic polyimide membranes have superior flux at low temperature for carbon dioxide and other condensable gases. Superior flux is achieved without reduction in selectivity or other valuable properties of prior art membranes.
Type:
Grant
Filed:
February 4, 1992
Date of Patent:
August 10, 1993
Assignees:
E. I. du Pont de Nemours and Company, L'Air Liquide S.A.