| 摘要 |
Extractive distillation is a process to separate close-boiling compounds from each other by introducing a selectively-acting third component, the extractive distillation solvent, with the result that the relative volatility of the mixture to be separated is increased and azeotropes, if present, are overcome. The extractive distillation solvent is to be selected such that it does not form an undesired azeotrope with any of the compounds in the mixture. The invention suggests a method of separation of aromatic hydrocarbons and naphtenes by distilling a mixture of aromatic hydrocarbons / naphtenes by way of an extractive distillation process in the presence of an extractive distillation solvent selected from the group consisting of a dione, ester of dibasic acid, N-methyl-2-pyrrolidone and a morpholine. |
