Granular carbon molecular sieves

✍ Scribed by T.A. Braymer; C.G. Coe; T.S. Farris; T.R. Gaffney; J.M. Schork; J.N. Armor

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 971 KB
• Volume: 32
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(94)90165-1

✦ Synopsis

Any future carbon molecular sieve (CMS) for use in the commercial production of NZ should have a high volumetric 0, equilibrium capacity. We developed a procedure for producing a high capacity coconut shell char that can be converted into a high capacity CMS for air separation. Granules of coconut she11 char are heated in flowing inert gas at about 2 to 12°C per minute to a peak temperature of 775" to 900°C. After holding from 1 to 8 hours, the char is cooled in an inert gas atmosphere. The granular char thus produced has an oxygen capacity in excess of 8.0 cc/cc. Contacting the char with an oxidizing atmosphere containing CO,, H?O, or O? at 650" to 900°C increases the O2 capacity to greater than 9.0 cc/cc. The coconut shell char can be converted to a CMS by treatment with a volatile carbon-containing organic compound that, when pyrolyzed, deposits carbon within the interior of the carbon granules. The granular CMS thus produced can be used in a nitrogen pressure swing adsorption column without the need for pelletization.