1778.  JOHNSON, G. W. (I. G. Farbenindustrie A.-G.). Improvements in the Cracking or Pressure Hydrogenation of Hydrocarbons. British Patent 524,380, Aug. 6, 1940. Chem. Abs., vol. 35, 1941, p. 6777.

Process for the catalytic conversion of hydrocarbons containing more than 15 gm. of H per 100 gm. of C, such as product of a catalytic reduction of CO with H_2, by subjecting them to a cracking treatment or to a hydrogenation treatment under pressure in the presence of an initially highly active catalyst the activity of which has been reduced for example by about 25% by its employment in a cracking of pressure hydrogenation treatment of carbonaceous substances poor in H. Example: a tar oil b. 200º-400º C. is led at 410º C. together with H₂ under a pressure of 200 atm. with a partial pressure of tar oil of 13 atm. over W disulphide rigidly arranged in a reaction vessel for 3 days. The activity of the catalyst is thus reduced by about 25%, which means that to obtain the original result the speed of the vapors and gases led through the vessel must be reduced by about 25%. A fraction of a hydrocarbon mixture b. 200º-325º C. of an oil obtained by the reduction of CO is then led over the same catalyst at the same temperature and at the same pressure. A product consisting to the extent of 70% of benzine is obtained. Only 6% of the initial material is converted into gaseous hydrocarbons.

JOHNSON, H. L. See abs. 2347.