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Abstract

The process for separating an aromatic from an entry hydrocarbon mixture also containing nonaromatics, by an extractive distillation method using an extractive distillation column with a selective solvent consisting essentially of an N-substituted Morpholine having substituents each of which contain no more than seven carbon atoms, includes distilling off the nonaromatics from the top of the extractive distillation column as a top product, drawing the aromatic and selective solvent from the extractive distillation column and subsequently separating the selective solvent from the aromatic in a separator column. The extractive distillation column is provided with an additional column portion for separation of a selective solvent residue from the separated nonaromatics without a separate top product distillation column. The hydrocarbon entry mixture is heated prior to admission to the extractive distillation column by an indirect heat exchange with selective solvent drawn from the separator column and heated to a temperature of from 130.degree. to 150.degree. C. to form a heated entry hydrocarbon mixture.

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First Claim