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.

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Literature Abstracts

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 n_D 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.