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Return to Abstracts of Literature 1750-1999

Literature Abstracts

 1812.    ---------------.  [KOCH, H.]  [Catalytic Aromatization of Aliphatic Hydrocarbons.  Literature Review and Verification.]  Brennstoff-Chem., vol. 20, 1939, p. 1-9; Chem. Abs., vol. 33, 1939, p. 9280.

        Procedure of Italian Patents 351,078 and 352,747 was used in treating the C7 Kogasin fraction at 500° with V and Cr oxides on Al2O3 for catalysts.  Treatment of the fraction boiling at 92°-95° and containing 68% heptene was attempted at 400°-530°; toluene was formed as the main constituent in an aromatic yield of 55% with 1 pass.  Dehydration, cyclization, and cracking also occurred, and the action of their products required frequent reoxidation of the catalyst.  In comparison, the reaction yield was much smaller when platinized C at 310°-350° was used.  With gasoline boiling >100° and prepared by the activated-C process, d. was increased from 0.710 to 0.742 and nD from 1,404 to 1.422 without the formation of low-boiling hydrocarbons in 5 sec. contact time at 520° with V oxide on Al2O3.  From a Kogasin fraction boiling 150°-300° passed over Cr oxide on Al2O3 for 3-4 sec. at 500°-510°, 15% low-boiling material was produced in which benzene, toluene, xylene, and PhEt were identified.  Gaseous products, depending upon the conditions and starting material, consisted of 5-10% unsaturated and 10-20% saturated compounds.  10 refs.