PATENTS

      1484.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  [Production of Antiknock Motor Fuels From Olefinc.]  German Patent Appl. I 67,516, OZ 12,277, filed July 30, 1940 (Cl. 12 o).  FIAT Reel 172, frame 140; PB 25,616.

            Olefins, such as propylene, isobutylene, and the like, are converted with CO and H₂ in known manner at temperatures 50º-200º and pressures of 10-200 atm. or more in the presence of catalysts into aldehydes.  These are condensed with CH₂O in presence of secondary or tertiary amines, which are partly in the form of their salts with carboxylic acids.  The high molecular aldehydes thus obtained are reduced in known manner to hydrocarbons.  The participants in the reaction are so chosen that the hydrocarbons are branched and have 5-11 C atoms.  Suitable raw materials are both straight- and branched-chain olefins, which can be produced in any number of ways, for example, by the dehydration of alcohols, the splitting of chlor paraffins, or the conversion of CO with H₂.  Suitable catalysts for the 1^st step are those containing Co or Ni the chromates of Mg, Cu or Hg, with carriers of pumice, bleaching earth, or alumina.  The aldehydes are reduced preferably with H₂ under increased pressure (10-100 atm. or more) at 230º-350º with hydrogenating catalysts such as sulfides of the 6^th or of the Fe group.