THE CHEMICAL COMPOSITION OF THE HYDROCARBON PART IN GAS OIL FRACTION OF FUSHUN SHALE OIL CRUDE

Hydrocarbon type distribution of the narrow cuts of acid-treated gas oil fraction (166～350℃) from Fushun shale oil crude is studied by use of distillation, adsorption and urea extractive crystallization techniques. 89—90％ by weight of hydrocarbons and 10—11％ by weight of non-hydrocarbons are found in each narrow cut. The content of paraffinic and cycloparaffinic hydrocarbons increases from 31.3％ to 41.0％ as the boiling point of the fractions is raised, and in which two-third of the saturates are composed of paraffins with straight chain structure. The amount of unsaturates is about one-third of each fraction and about half of the unsaturates are olefins of normal structure. The content of aromatics differs slightly in different cuts. In analogous manner, hydrocarbon type composition of wide cut of gas oil (166～350℃) from Fushun shale oil crude is studied, except that the separation of hydrocarbons and non-hydrocarbons is effected by elution chromatography instead of acid treatment. The hydrocarbons thus obtained amount to 73.5％, whereas non-hydrocarbons are 26.5％ (with nitrogenous compounds predominating). In the hydrocarbon portion, normal paraffinic, cycloparaffinic and branched paraffinic, normal olefinic, isoolefinic and cycloolefinic, monocyclic aromatic and polycyclic aromatic hydrocarbons amounts to 20.4, 7.4, 13.9, 12.1, 8.5 and 9.6％ respectively. Apart from that, about 1.6％ dark colored tarry matter is separated from the hydrocarbon portion. A simplified procedure for the hydrocarbon type analysis of gas oil fraction from shale oil crude by adsorption chromatography is also recommended.