PATENT

3519. ----- [STANDARD OIL CO.]  (I. G. Farbenindustrie A. G.).  [Improving the Antiknock Properties of Motor Fuels.]  German Patent Appl. St 59,586, OZ 12,075, filed Mar. 27, 1940 (Cl. 23 b).  FIAT Reel 163, frames 1,486-1,495; PB 25,607.

Gasolines of aliphatic nature, such as those obtained by reduction of CO with H₂, may have their antiknock properties improved by a pressure hydrogenation in the vapor state under pressures of 5-30 atm., temperatures of 450°-550°, a H₂ partial pressure of 20-70% of the total pressure but not to exceed  25 atm., and in presence of catalysts containing oxides of metals of group 6  on active silica gel or alumina.  suitable proportions of feed are 0.6 m.³ H₂ per kg., of raw material and 1 kg. of raw material per 1. of catalyst space per hr.  A yield is obtained of 78% gasoline boiling up to 200°, containing 25% aromatic hydrocarbons, 33% of fractions boiling up to 100°, and an octane no. of 65.