1820.  ------. [KEITH, P. C.] (Hydrocarbon Research, Inc.). Synthesis Gas. United States Patent 2,642,346, June 16, 1953. Chem. Abs., vol. 47, 1953, p. 8997.

Apparatus for the efficient utilization of the exothermic heat of oxidation in the production of H₂ and CO from CH₄. A granular solid thermophore or catalyst is circulated countercurrent to the gas stream to provide efficient heat transfer from the product gases back to the reaction zone and to preheat the reactants. Preferred operating conditions require the reaction zone maintained at 1,650º-1,850º F. and an O₂ feed of at least 35% and preferably 95% purity.

See also United States Patent 2,526,652 (abs. 769).