1791.  ------. [KALBACH, J. C.] (Hydrocarbon Research, Inc.). Fuel Gas. United States Patent 2,609,283, Sept. 2, 1952. Chem. Abs., vol. 47, 1953, p. 849.

High-heating-value fuel gas is produced by simultaneously hydrogenating and carbonizing autogenously a comminuted, solid carbonaceous material containing volatilizable constituents in a dense-phase fluidized bed in the presence of a stream of H₂ at 300-750 p. s. i. g. and about 538º-816º. From the carbonizer a mixture of hydrocarbons and unreacted H is withdrawn, together with a C-containing residue. The latter is gasified with steam and air to produce CO and H₂. The H₂ is separated from the CO and used in the carbonizer, and the CO is added to the gases from the carbonizer.