2491.     OBOLENTSEV, R. D.  [Research on Isomerization of Liquid Normal Aliphatic Hydrocarbons.]  Jour. Gen. Chem. (U.S.S.R.), vol. 16, 1946, pp. 77-93; U.O.P. Co. Survey Foreign Petroleum Literature Transl., 634, 1946.

        As one of the starting materials, synthin, which consisted of a mixture of paraffins (63.5 wt. %), olefins (20.6%), and aromatics (15.9%), was used.  The catalyst was a fused mixture of AlCl₃ with other salts.  The synthin was first hydrogenated over Ni to a Br no. of 0-1 and the product freed from aromatics with fuming H₂SO₄ to a negative formolite test.  The resulting mixture was fractionated and refractionated in laboratory distillation columns, yielding finally about 10 l. of concentrates containing normal hexane, heptane, and octane.  Their content of branched chain hydrocarbons was within 8-12%.  Many fractionations of these concentrates gave the normal paraffins desired in 94-97% concentration.