208. BOYD, G. A., AND SEELY, C. H. (Standard Oil Co. of Indiana). Hydrocarbon Conversion Process. United States Patent 2,253,607. Aug 26, 1941: appl. Filed June 19, 1937. Serial No. 149,104: 2 claims (cl. 196-10). Chem. Abs., vol. 35, 1941, p. 8259.

Describes an arrangement of apparatus and a method of preparing high-antiknock motor fuel. The method involves subjecting substantially S-Free gaseous hydrocarbons such as natural or refinery gas to a controlled oxidation by bringing into contact with steam and a catalyst comprising Ni at a temperature of about 1,200°-1,500° F. to produce CO and H₂: admixing the CO and H₂ with substantially unpolymerizable hydrocarbons: subjecting the mixture to a hydrocarbon synthesis step. Including contacting with a catalyst comprising a metal of the 8^th group at a temperature of about 400° F. to synthesize hydrocarbon gases: separating from such synthesized hydrocarbon gases a fraction containing substantially unpolymerizable fixed gases: recycling the recovered fixed gases to the first mentioned high temperature: controlling oxidation to produce additional CO and H₂ separating from such synthesized hydrocarbon gases a second fraction containing polymerizable gaseous hydrocarbons: polymerizing at least a part of such synthesized hydrocarbon gases to form liquid hydrocarbons boiling within the motor-fuel boiling range: fractionating the polymerization product to recover at least 1 fraction comprising unpolymerized hydrocarbons: admixing the CO and H₂ from the oxidation step with the unpolymerized hydrocarbons from the polymerization step and passing the mixture to the hydrocarbon-synthesis step.