1704. KAZANSKII, B. A., SERGIENKO, S. R., AND ZELINSKII, N. D. Contact Cyclization of Paraffinic Hydrocarbons. Compt. rend. acad. sci. U.R.S.S., vol. 27, 1940, pp. 664-669 (in English); Chem. Abs., vol. 35, 1941, p. 1387.

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Literature Abstracts

1704. KAZANSKIĬ, B. A., SERGIENKO, S. R., AND ZELINSKIĬ, N. D. Contact Cyclization of Paraffinic Hydrocarbons. Compt. Rend. Acad. Sci. U.R.S.S., vol. 27, 1940, pp. 664-669 (in English); Chem. Abs., vol. 35, 1941, p. 1387.

Fraction of synthin, boiling at 83°-138°, containing 11.84% unsaturates and having 66.0 aniline point and 10 octane number, was passed over catalysts at 425°-500°, giving condensates having the following values for % unsaturates, % aromatics, aniline point (maximum), and octane number: 90% silica gel and 10% Cr₂O₃ (preheated in H₂ to 450°) at 450°, 5.30, 11.37, 57.5, --; 1:1 mixture of silica gel-Cr₂O₃ (reduced in H₂ at 450°) at 425°-450°, 5.60, 14.5, 58.0, 22; 91.5% Cr₂O₃ and 8.5% NiO at 450°, 6.03, 16.38, 48.4, --; 85% Al₂O₃ and 15% UO₃ (preheated in N₂ to 450°) at 500°, 11.26, 11.40, 56.2, 26; 62% Al₂O₃, 24% Cr₂O₃, and 14% UO₃(preheated in N₂ at 475°) at 475°, 9.78, 26.42, 32.3, --; 80% Al₂O₃ and 20% MoO₃ (preheated in N₂ to 450°) at 450°, 6.03, 15.74, 52.8, 24; and Zn chromate at 475°, 20.84, l, 58.9, --. Platinized charcoal (containing 23% Pt and prepared by impregnating activated charcoal with H₂PtCl₆ solution and heating in H₂ at 300°-310°) at 300°-356° did not aromatize the synthin fraction. After removal of unsaturated hydrocarbons from the synthin fraction by means of Katwinkel mixture (see abs. 1678) the platinized charcoal at 350° aromatized the remaining hydrocarbons to approximately the same degree as with octane. Air blowing has no effect on the activity of Zn chromate catalyst.