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Literature Abstracts

 1828.    KOCH, H., AND IBING, G.  [Composition of Hard Paraffins Produced in the Naphtha Synthesis of F. Fischer and H. Tropsch.] Brennstoff-Chem., vol. 16, 1935, pp. 141-148; Ges. Abhandl. Kenntnis Kohle, vol. 12, 1937, pp. 402-419; Petrol. Refiner, vol. 22, 1943, pp. 279-286; Chem. Abs., vol. 29, 1935, p. 5642.

        Separation of the high-molecular hydrocarbons by various methods has been studied, and the extraction and reduced pressure-distillation methods have been investigated.  Extraction with ether, dichloroethylene, and CHCl₃ indicates possible separation into groups of similar molecular weight and properties.  Repeated distillation at 10^-5 mm. Hg did not greatly concentrate individual hydrocarbons.  Molecular weights increased uniformly with melting point.  n-Paraffins to as high as C₁₅₀H₃₀₂ are indicated; they melt at 117° and have a molecular weight of 2,000.