Gas separation using adsorbent activated carbonized polyarylamides
AssigneeThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorsJohn J. Freeman, Frederick G. R. Gimblett, Robert A. Hayes, Kenneth S. W. Sing
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Abstract
Novel polyarylamide derived activated carbon materials are provided by a process comprising the carbonization of polyarylamide fibre at a temperature in excess or 400.degree. C. followed by activation at elevated temperature. The novel materials have the ability to adsorb relatively large quantities or carbon dioxide compared to other activated carbonized polymer materials, Preferably the carbonization and activation steps are carried out by raising the temperature of the materials to between 840.degree. C. and 880.degree. C. in carbonizing/activating atmospheres respectively.
Claims17
A process for separating carbon dioxide from a gaseous mixture by contacting the mixture with a fibrous adsorbent activated carbon whereby the polar molecules are preferentially adsorbed, wherein the activated carbon is prepared by carbonizing a material comprising polyarylamide fiber which is a condensation product of 1,4-diaminobenzene and terephthalic acid, at a temperature of about 840.degree. C. to about 880.degree. C. and activating the carbonized product in an activating carbon dioxide-containing atmosphere at an elevated temperature of about 840.degree. C. to about 880.degree. C., the overall weight loss of the fiber during the process being 73% to 91% of the starting weight of the fiber.
Dependencies are inferred from the claim text.