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• W116804833 abstract "Organic sulfur was removed from three bituminous coals by the oxydesulfurization process developed at the Ames Laboratory. This method is based on leaching finely powdered coal with hot solutions of dilute sodium carbonate containing oxygen under moderate pressure. The organic sulfur content was then analyzed by different techniques to evaluate the removal of organic sulfur. The American Society for Testing and Materials procedure (D2492), which is an indirect method based on the difference between the total sulfur and the total inorganic sulfur, was used to determine the organic sulfur content. In addition, the fate of iron and sulfur was assessed by a series of extraction experiments with analysis of the solid residues and the liquid extracts by conventional chemical methods. Finally, an instrumental method based on electron microprobe x-ray analysis was used for the direct determination of organic sulfur in the organic matrix. Significant reduction of total sulfur was obtained by oxydesulfurization of the three coals. The removal of organic sulfur was found to be quite different, depending on the method chosen for comparison of organic sulfur levels in the raw and in the treated coals. In addition, the degree of removal of organic sulfur was subject to influences arisingmore » from the analytical methodology. Thus the difficulties in evaluating the removal of organic sulfur from coal are not only due to differences in characteristics from coal to coal, sample heterogeneity, or fluctuations in the treatment. The variations in the organic sulfur content may also stem from analytical problems which are especially likely with coals that have been altered during the chemical desulfurization treatment. This points to a need for a method of determination of organic sulfur that is direct, applicable to raw as well as chemically treated coals, and employable on a routine basis.« less" @default.
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• W116804833 date "1981-10-26" @default.
• W116804833 modified "2023-09-26" @default.
• W116804833 title "Evaluation of the Removal of Organic Sulfur from Coal" @default.
• W116804833 doi "https://doi.org/10.1021/bk-1981-0169.ch023" @default.
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