Purification of crude sulfolane to remove color imparting and turbidity imparting impurities therefrom is achieved by a two-pass distillation process wherein purified sulfolane is withdrawn from the bottom of a column in the second distillation pass.
A process for reducing the odor of sulfolane fluid comprises contacting the fluid with and oxidizing agent under conditions sufficient to effect the substantial reduction of odor in the fluid.
The invention relates to a semibatchwise process for the mild distillative separation of mixtures, in a first stage a column being supplied continuously with a feed and the feed being separated at least into different fractions, one of the fractions being removed continuously into a container, and, in a second step, the fraction removed into the container being recycled to the column and being separated again batchwise into different fractions.
