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| - Fundamental Study of the Phase Behavior of Wash Oil withDiphenyl Ether
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| - Diphenyl ether is a potential modifier to decrease the melting temperatures of wash oils andthus to prevent solid formation from the recycled stream in an aromatics removal process.Fundamental study of the solid−liquid equilibria for the related mixtures was undertaken inthe present work. Solid−liquid equilibrium data were measured for binary and multicomponentmixtures containing model compounds of wash oils (acenaphthene, dibenzofuran, fluorene, andphenanthrene) and diphenyl ether. The results showed that adding diphenyl ether substantiallylowered the melting points of wash oils. A series of batch distillations with various initial feedswere also made to investigate further the property changes of the wash oils before and afterrecovery. It was found that diphenyl ether could still remain in the residues (the recovered washoils) and changes in the melting temperature of oils were minor. These low-melting wash oilscan be recycled directly to benzol scrubber for reuse. The binary solid−liquid equilibrium datawere correlated with the NRTL model. The solution model with the determined parameters iscapable of predicting the solid−liquid equilibrium temperatures of the pseudo-binary (multicomponent) system to an AAD of 0.3%.
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