2039. LEWIS, W. K. (Standard Oil Development Co.). Gas Rich in Carbon Monoxide. United States Patent 2,631,934, Mar. 17, 1953. Chem. Abs., vol. 47, 1953, p. 6637.

Gas rich in CO is prepared in a 2-stage process from solid carbonaceous material. In the 1^st zone, fluidized carbonaceous material is brought into contact at 1,500°-2,000° F. with feed gas rich in CO₂, steam, and O₂ to reduce CO₂ and steam completely and obtain product gas high in CO. The carbonaceous material is withdrawn and charged to a 2d zone where, at 1,500°-2,500° F. for combustion of C but low enough to prevent sintering of ash, steam and O₂ are brought into contact with the fluidized mass to prepare feed gas for the 1^st zone.