Abstract
The phase behaviour of pyrene-tetralin mixtures was investigated in the temperature range 620–700 K. As these compounds are unstable under these conditions, degradation products including naphthalene, 2 3 dihydro 1-methyl indene, and dihydropyrene were identified. Naphthalene was found to be the principal degradation product in the liquid phase(s). Phase splitting of the liquid phase was observed at temperatures 〉 691 K and the composition of the two liquid phases were found to vary with hydrogen pressure. Phase splitting, attributed to the coincidence of the reaction conditions and the critical region of mixture components, can account for the existence of optimum solvent compositions for coal liquefaction reactions. The existence of such optima has previously been attributed to synergistic interactions between solvent components.
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