3953.  WIRTH, G., AND LAUDENKLOS, H. Conversion of Carbon Monoxide and Hydrogen Into Hydrocarbons of More Than One Carbon Atom. United States Patent 2,345,957, Apr. 4, 1944. Chem. Abs., vol. 38, 1944, p. 4778.

In the process of conversion of CO and H₂ into hydrocarbons or more than 1 C atom, the major portion of the gaseous product, issuing from the catalytic conversion zone, is recycled to the entrance of the fresh feed stock, without change in temperature. This recycled gas is maintained in amounts of 4 or5 times the fresh gas. The remaining portion of the gases issuing from the reaction zone is separated into liquid and solid components. The increase in yield of the desired hydrocarbons is up to 38% by this method.