3595. WARD, C. C., SCHWARTZ, F. G., AND ADAMS, N. G. Composition of Fischer-Tropsch (Cobalt Catalyst) Diesel Fuel. Ind. Eng. Chem., vol. 43, No. 5, 1951, pp. 1117-1119.
Sample of diesel fuel prepared by the German modification of the Fischer-Tropsch process, using a Co catalyst, was fractionated and analyzed by use of refractometric and spectrographic methods. The sample contained about 2% of oxygenated material, which was removed by percolating the sample through silica gel. 80 gal. of the percolate was fractionated at reduced pressure, and 177 0.5% fractions were collected. The density, refractive-indexes, Br number, and cetane number were determined on each fraction and the infrared spectra on selected fractions. The approximate composition of the fuel was as follows, in %: Oxygenated compounds, 2; a-type olefins, 1.5; internal-type olefins, 8.5; paraffins, 88. Engine tests on several of the fractions indicated ratings higher than cetane, showing the need for a standardized method of rating Diesel fuel components that have a cetane number of more than 100.