2142. ------. [MARTIN, F., GOTTSCHALL, W., AND VELDE, H.] (Ruhrchemie A. G.). [Process for Improving the Antiknock Properties of Gasoline Hydrocarbons and for Removing the Gum-Forming Constituents Contained Therein.] German Patent Appl. R 105,206, R 452,

PATENTS

2142. ------. [MARTIN, F., GOTTSCHALL, W., AND VELDE, H.] (Ruhrchemie A. G.). [Process for Improving the Antiknock Properties of Gasoline Hydrocarbons and for Removing the Gum-Forming Constituents Contained Therein.] German Patent Appl. R 105,206, R 452, filed May 8, 1939 (Cl. 23 b-1.05). TOM Reel 41, bag 2,744, item 22, 5 pp.; TOM Reel 177, frames 1,578-1,580; Meyer Transl. PC-S-II, Fischer-Tropsch, vol. 1, 1948, chap. 27, p. 68.

Antiknock properties of gasoline hydrocarbons can be improved and the gum-forming constituents therein removed by the use of surface-active inorganic substances such as activated bleaching earths. The operation is carried out in 2 steps; in the 1^st step the gasoline is treated with bleaching earth at temperatures 250°-400°. The improved gasoline is then treated <200° with some of the used bleaching earth from the 1^st step to remove any gum-forming constituents still present. The temperature in the 1^st step is gradually increased as the improving effect of the bleaching earth on the octane number depreciates.