Distillation process with a laval nozzle

Abstract

The invention relates to a process for at least partially separating a light boiling component from a mixture containing said light boiling component and at least a heavy boiling component, the process comprising the steps of (a) feeding the mixture into a distillation column and withdrawing a distillate stream enriched in the light boiling component from the top section of the distillation column and withdrawing a bottom stream enriched in the heavy boiling component from the bottom section of the distillation column: and (b) transferring at least part of the distillate stream as a condensation stream to a condensation device wherein the condensation stream is at least partially condensed and recycled to the top section of the distillation column, wherein the condensation device comprises a pump and a de Laval nozzle having a throat, a converging zone before the throat and a diverging zone after the throat, the condensation stream being passed into the converging zone of the de Laval nozzle, the condensation stream being accelerated to sonic speed while passing the throat, the condensation stream being expanded in the diverging zone to supersonic speed, thereby at least part of the condensation stream being condensed to form a liquid recycle stream, and the recycle stream being recycled through the pump to the top section of the distillation column.

Dependencies are inferred from the claim text.