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Carbon dioxide pressure swing adsorption process using modified alumina adsorbents

United States Patent

5,917,136
June 29, 1999
View the Complete Patent at the US Patent & Trademark Office
A pressure swing adsorption process for absorbing CO.sub.2 from a gaseous mixture containing CO.sub.2 comprising introducing the gaseous mixture at a first pressure into a reactor containing a modified alumina adsorbent maintained at a temperature ranging from 100.degree. C. and 500.degree. C. to adsorb CO.sub.2 to provide a CO.sub.2 laden alumina adsorbent and a CO.sub.2 depleted gaseous mixture and contacting the CO.sub.2 laden adsorbent with a weakly adsorbing purge fluid at a second pressure which is lower than the first pressure to desorb CO.sub.2 from the CO.sub.2 laden alumina adsorbent. The modified alumina adsorbent which is formed by depositing a solution having a pH of 3.0 or more onto alumina and heating the alumina to a temperature ranging from 100.degree. C. and 600.degree. C., is not degraded by high concentrations of water under process operating conditions.
Gaffney; Thomas Richard (Allentown, PA), Golden; Timothy Christopher (Allentown, PA), Mayorga; Steven Gerard (Allentown, PA), Brzozowski; Jeffrey Richard (Bethlehem, PA), Taylor; Fred William (Allentown, PA)
Air Products and Chemicals, Inc. (Allentown, PA)
08/ 725,593
October 3, 1996
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The subject matter presented in this patent application was funded in part by the United States Department of Energy (DOE) under Cooperative Agreement No. DE-FC36-95G010059. The DOE may possess certain rights under the claims appended hereto.