2141. MARTIN, F., GOTTSCHALL, W., AND VELDE, H. [Increasing Octane Number of Synthetic Gasoline.] German Patent Appl. —, filed June 20, 1939; APC 280,054.

Octane number of synthetic gasolines, for example, from the Fischer-Tropsch process, is increased by heating with fuller’s earth, activated with acid or with small amounts of AlCl₃, ZnCl₂, FeCl₃, or BF₃. Silica gel or alumina may be employed in place of clay. Gasoline obtained by hydrogenation of CO, b. p. range 40°-200° C., was passed at 180°-200° C. over activated fuller’s earth at the rate of 400 cc. per hr. per kg.; octane no. was raised from 44 to 51.