3929.  WILCOX, W.D. (Oil & Gas Research, Inc.). Carbon Black, Carbon Monoxide, and Hydrogenation From Hydrocarbon Gases. United States Patent 2,322,989, June 29, 1943; appl. filed Aug. 11, 1939. Chem. Abs., vol.38, 1944, p. 242.

Process is employed for producing C black, CO and CO-O₂ gas mixtures having a ratio of the H₂ to the CO of 2:1, which involves the steps of pyrolysis within a dissociation chamber, at a temperature of 2,800° -3,000° F., of a hydrocarbon gas to which has been added a volume of CO₂<1/2 the volume of the hydrocarbon gas, separation of the resultant gas mixture, and the C particles not retained within the chamber and then introducing into the chamber a volume of CO₂ which together with the CO₂ added in the first step of the process, equals approximately 1/2 the volume of the hydrocarbon gas, and treating the CO₂ at a high temperature with the residual C to form CO, which is added to the resultant gas mixture obtained in the 1^st step.