GRANULAR CARBON MOLECULAR-SIEVES

被引:47
作者
BRAYMER, TA
COE, CG
FARRIS, TS
GAFFNEY, TR
SCHORK, JM
ARMOR, JN
机构
[1] Air Products and Chemicals, Inc., Allentown, PA 18195
关键词
ADSORBENT; AIR SEPARATION; CARBON MOLECULAR SIEVES; COCONUTS; GRANULES; PYROLYSIS;
D O I
10.1016/0008-6223(94)90165-1
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Any future carbon molecular sieve (CMS) for use in the commercial production of N2 should have a high volumetric O2 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 shell char are heated in flowing inert gas at about 2 to 12-degrees-C per minute to a peak temperature of 775-degrees to 900-degrees-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 CO2, H2O, or O2 at 650-degrees to 900-degrees-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.
引用
收藏
页码:445 / 452
页数:8
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