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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.