Modified carbon molecular sieves for gas separation

Details Modified carbon molecular sieves for gas separation Modified carbon molecular sieves for gas separation

B - Operations, Transporting

01

J

B01J 20/20 (2006.01) B01D 53/02 (2006.01) C01B 13/02 (2006.01) C01B 21/04 (2006.01) C01B 23/00 (2006.01)

Patent

CA 2049806

A process is provided for making a modified carbon molecular sieve which is suitable for separating gases having different adsorption rates on the sieve. The process involves modifying a starting sieve support having a majority of micropores with an effective pore size of about 4.5 to 8 angstroms, with a two-step process in which the sieve is contacted with two different volatile carbon-containing organic compounds, preferably hydrocarbons, which have different molecular dimensions. The compound used in the first step is larger than that in the second step, so that the pore openings of the micro- pores of the support are narrowed successively in two distinct steps without filling the micropores themselves. The invention also discloses an improved carbon molecular sieve and the separation of gases, such as oxygen from nitrogen, by the use of this improved adsorbent.

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