Abstract
Results from Part 1 suggest that mesophase formation during coal hydrogenation is controlled, not only by temperature and time, but also by hydrogen availability. Further work was done to test whether mesophase, once formed from asphaltene, could be re-liquefied if sufficient hydrogen were made available. Several mesophase samples were hydrogenated in an autoclave without vehicle solvent. After hydrogenation, the samples produced up to 33% of benzene-soluble material and the microscopic features of the remaining solid material changed. Mesophase formation is temperature- and time-dependent, and this process cannot be reversed by simply lowering the temperature. However, if the chemical changes occurring have been introduced by hydrogenation, mesophase can be reliquefied.
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