SEPARATION OF HIGH PURITY CARBON NONOXIDE FROM GASEOUS MIXTURE

PURPOSE:To obtain high purity CO in a high yield when CO is separated from a gaseous mixture by an absorption-desorption method with a solid CO absorbent, by using plural groups of absorbents having different grain sizes so as to reduce the space in an absorber. CONSTITUTION:A solid CO absorbent manufactured by supporting CuAlCl4 on alumina is screened to prepare two or more groups of absorbents having a similar shape or different shapes and different grain sizes. At this time, relation represented by the equation is preferably established between the average grain size Dp of one group and the average grain size (d) of other group which follows said group in the order of decreasing grain sizes. The groups of absorbents are packed into an absorber, a gaseous mixture contg. CO such as exhaust gas from a blast furnace is brought into contact with the absorbents to absorb CO, and the absorbed CO is desorbed to obtain high purity CO.