1815. ---------------. [KOCH, H.] [Quantitative Separations of Hydrocarbons by Distillation at Various Temperatures and Separation of Olefins and Paraffins.] Reichsamt Wirtschaftsausbau, Prüf-Nr. 43, 1940, pp. 93-102, PB 52,003; Chem. Abs., vol. 41, 1947, p. 6492.

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Literature Abstracts

Separation and identification of some of the components of Kogasin are described. For studying the lower hydrocarbons, a low-temperature column was designed that consisted of a 6-m. spiral of glass tubing of 5 mm. inside diameter surrounded by a vacuum jacket. The head of this column works on the thermosiphoning principle. With a test mixture of n-heptane and methylcyclohexane, this column showed 20 theoretical plates. A chart of the separation of C₃H₈, n- and iso-C₄H₁₀, and iso-C₅H₁₂ is shown. A high-temperature column was developed in which a heated oil was circulated around the column to maintain adiabatic conditions. A review of the results obtained in I number methods for olefins is described. The Kaufmann and Gross-Oetringhaus thiocyanogen method using CCl₄ gave the best results for the 5 olefin types. The Hg(OAc)2-MeOH method was used for separating olefins from paraffins. An olefin-paraffin mixture was extracted with Hg(OAc)₂-MeOH reagent, and the paraffin was removed from the reaction mixture by reduced-pressure distillation. The olefins were recovered in pure form by hydrolyzing the Hg(OAc)₂, olefin complex with a strong mineral acid such as HCl. Of the paraffins in a lower Kogasin fraction, 2-methylbutane, n-C₅H₁₂, 2-methylpentane, 3-methylpentane, n-C₆H₁₄, 2-methylhexane, 3-meethylhexane, and n-C₇H₁₆ have been isolated. Of the monöolefins 3-methyl-1-butene, 1-pentene, cis-and trans-2-pentene, 3-methyl, 1-pentene, 4-methyl, 1-pentene, 1-hexene, cis-and trans-2-hexane. 3-methyl-1-hexene, 5-methyl-1-hexene, 4-methyl-1-hexene, 1-heptene, and cis-and trans-2-heptene have been isolated.