Abstract
A procedure for the chemical characterization of hydrocarbons in the naphtha fraction C5 to C 13 from synthetic fuels has been developed. The procedure provides complete distillation information, sulphur content, hydrocarbon-type distribution analysis of saturates, olefins and aromatics as well as individual identification of the major hydrocarbon constituents of the naphtha. The method employs gas chromatography, selective chemical absorption, and both flame ionization and flame photometric detection. Quadrupole mass spectrometer interfaced with integration and data analysis system was used for identification of the individual hydrocarbons. A complete characterization takes 90 min. and requires only 30 pL of sample. The results of hydrocarbon-type distribution are not dependent upon interpretation by the analyst as in the standard fluorescent indicator adsorption method. The flame photometric sulphur detection was preceded by chromatographic separation, and its flow parameters were modified to meet the high sulphur requirement of the naphthas from synthetic fuels. Five naphtha samples produced by the hydrocracking of Athabasca bitumen under various operating conditions were analyzed by this method.
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