| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a pressure swing adsorbing method for removing carbon dioxide from a gas stream by using an alumina adsorbent enhanced in CO2 adsorbing capacity. SOLUTION: Starting alumina is impregnated with a basic soln. with pH of at least 9, for example, a soln. of a basic compd., for example, KHCO3 and the impregnated alumina is dried to obtain improved alumina used as an adsorbent. The drying of impregnated alumina is performed at temp. low enough to avoid a CO2 adsorbing form so that the basic compd. is not regenerated by purging under pressure lowered by the decomposition of the basic compd.</p> |
