Patent ID: 6280503
Filing Date: 2001-08-28
Classification: B01D,B01J,Y02C

Abstract:
In a pressure swing adsorption process for adsorbing carbon dioxide from a gas stream containing carbon dioxide the improvement which comprises bringing said gas stream into contact with a magnesium oxide-containing adsorbent at a temperature in the range of 300 to 500.degree. C., said adsorbent represented by the chemical formula:{(M.sub.2 CO.sub.3).sub.m (2MHCO.sub.3).sub.(1-m) }.sub.n (MgCO.sub.3).sub.p (MgO).sub.(1-p).xH.sub.2 Owherein M is an alkali metal, 0.ltoreq.m.ltoreq.1, 0.ltoreq.n.ltoreq.1.30, 0.ltoreq.p<1 and x represents the extent of hydration, with the proviso that when n equals 0 the MgO is made by the dehydration and CO.sub.2 removal of {MgCO.sub.3 }.sub.y.{Mg(OH).sub.2 }.sub.(1-y).xH.sub.2 O; in which 0.1.ltoreq.y.ltoreq.0.9 and x indicates the extent of hydration.