1353. ---------------. [HAMMERICH, T.] [Analytical-Arithmetical Determination of the Research Octane Number of Gasolines From the Fischer-Tropsch Synthesis.] oel u. Kohle, vol. 37, 1941, pp. 148-155; Brennstoff-Chem., vol. 22, 1941, p. 154; British Abs., 1948, B, I, p. 281; Chem. Abs., vol. 35, 1941, p. 8268.

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Literature Abstracts

1353. ---------------. [HAMMERICH, T.] [Analytical-Arithmetical Determination of the Research Octane Number of Gasolines From the Fischer-Tropsch Synthesis.] Oel u. Kohle, vol. 37, 1941, pp. 148-155; Brennstoff-Chem., vol. 22, 1941, p. 154; British Abs., 1948, B, I, p. 281; Chem. Abs., vol. 35, 1941, p. 8268.

For degasified Fischer-Tropsch gasolines, octane No. =0.7X0.4X (olefin index) + 0.69X(vaporizability), the olefin index being equal to (I numberXboiling index)/100, and vaporizability the mean of the constituents going over at 60° and at 100°. For 115 gasoline samples covering production of nearly all German plants, 60% showed 0 to ±1 deviation from the Co-operative Fuel Research octane No.; 20% showed ±1.5 deviation; 15% up to ±3 units; and the remaining 5% from ±3.5 to ±5. Mixed octane numbers in 1:1 mixture with Stanavo aviation gasoline, however, showed considerable deviation. The relationship is not valid if the synthesis conditions are changed or if the gasoline has been treated. Diagrams are given from which octane No. may be read directly.