3516. ----- [STANDARD OIL CO.] Improvements in or Relating to Hydrocarbon Synthesis. British Patent 652,477, Apr. 15, 1951. Chem. Abs., vol. 45, 1951, p. 9837.

The economics of the catalytic synthesis of hydrocarbons and oxygenated products from CO and H₂ are improved by better utilization of synthesis tail gas. This tail gas from a 1^st synthesis stage, after suitable CO₂ removal, is converted by use of free O₂ in a secondary gas generator to produce a secondary synthesis gas, which is converted to synthesis products. Tail gas from the 2d synthesis stage is converted into synthesis gas and processed in a 3d synthesis stage.