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Literature Abstracts

 1492.    HORN, W. A.  Interrogation of Prof. Franz Fischer at Munich, Germany.  FIAT Final Report 90, 1945, 3 pp.; PB 1,253; TOM Reel 199.

        Isosynthesis process produces iso-octanes by the polymerization or alkylation of isobutylene obtained by the dehydrogenation of isobutane and isopentane produced by synthesis from CO and H₂ at 300-600 atm. and 400°-500° in the presence of a Th catalyst activated with 10-20% of Al₂O₃.  The product contains higher-boiling constituents consisting of naphthenes, aromatics, ethers, and alcohols.  The proportions of these and of the isoparaffins can be varied by changing the operating conditions and the catalyst; the addition of ZnO favors the formation of naphthenes and aromatics, of Al₂O₃, the isoparaffins.  In preparing a Th-ZnO catalyst, its activity with respect to the formation of liquid hydrocarbons can be virtually doubled by pouring the nitrate solution in to the soda solution, the reverse of normal precipitation.  Attempts have been made to replace the Th in the catalyst with other elements but unsuccessfully; a part only (25%) can be substituted by either Al₂O₃, ZnO, or a mixture of both.  Mention is made of Fe synthesis, Ni catalysts, suspended catalysts, and isomerization of Fischer-Tropsch products with AlCl₃ promoted by HCl, but no details are given.