Abstract
Assam coal was hydrogenated in batch autoclaves in the presence of tetralin as solvent (vehicle) and ammonium molybdate as catalyst at 21.6 ± 0.2 M Pa hydrogen pressure in the temperature range of 390 °C to 410 °C. The data generated from these experiments were simulated using 16 kinetic models. Optimum rate parameters for these models were estimated using Marquardt's nonlinear least square technique. Discrimination between the rival models was based on physical criteria, statistical tests and the closeness of fit. Two of the 16 models were found to be acceptable. The characteristic features of these two models are: asphaltenes are not formed directly from coal, more than one type of oil is produced in the reaction, and one of the oils, formed directly from coal, generates a fraction of the asphaltenes through retrogressive reaction, while the preasphaltenes, an intermediate formed directly from coal, are the primary source of asphaltenes.
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