2673. PIER, M., AND SIMON, W. Cracking or Pressure Hydrogenation of Hydrocarbons. United States Patent 2,224,003, Dec. 3, 1940; appl. filed Mar. 24, 1939, Serial No. 263,908, in Germany Apr. 1, 1938; 4 claims (Cl. 196-50). Chem. Abs., vol. 35, 1941, p. 2312.

In cracking oils rich in H, such as Kogasin, gas formation is reduced by the use of a hydrogenation catalyst previously partly spent by use in destructive hydrogenation of oils poor in H. W disulfide was used to hydrogenate a coal tar oil for 3 days, reducing its activity by 25%. It was then used without revivification to crack a 200-325 C oil from CO to a 70% yield of gasoline with only 6% yield of hydrocarbon gas.