B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/04 (2006.01) B01D 53/047 (2006.01) B01J 20/18 (2006.01) B01J 20/20 (2006.01) C01B 13/02 (2006.01) C01B 21/04 (2006.01)
Patent
CA 2088034
PATENT - 211PUS04514 ABSTRACT Nitrogen is produced by separating air in a pressure swing adsorption process using a high capacity kinetically O2 selective material as the adsorbent. An example of such an adsorbent is a carbon molecular sieve made from coconut shell char. Such a coconut shell char having a high oxygen volumetric capacity is provided by crushing and sizing coconut shells to form granules which are then heated in flowing inert gas at a temperature ramp rate of about 2 to 12°C per minute to a peak temperature of 775 to 900°C which is then held so that the total heating time is up to 8 hours and thereafter the granular char is cooled in an inert gas atmosphere. The granular char thus produced is kinetically selective for O2 over N2 without further modification to narrow the openings of its micropores and has an oxygen volumetric capacity in excess of 8.0 cc/cc at 1 atm. and ambient temperature. Further modification of this char is provided by contacting it with an oxidizing atmosphere of carbon dioxide or a mixture of inert gas and carbon dioxide H2O or O2 at temperatures ranging from 650 to 900°C untilthe gasified char has been altered so that its volumetric oxygen capacity is greater than 9.0 cc/cc at 1 atm. and ambient temperature.
Auvil Steven Ray
Schork Joan Marie
Srinivasan Rajagopalan Sree
Air Products And Chemicals Inc.
Mcfadden Fincham
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