Separation of a mixture of C.sub.4 -hydrocarbons by extractive distillation

US4162198A · kind A · utility

Assignee

• BASF SE

Inventors

• Dieter Stockburger · Havelsee, DE
• Klaus Volkamer · Bischofswerda, DE
• Detlef Bender · Monsheim, DE
• Klaus-Juergen Schneider · Neustadt, DE
• Harald Schwentker · Bad Dürkheim, DE
• Ulrich Wagner · Bernburg, DE
• Hans-Martin Weitz · Bad Dürkheim, DE

Key dates

• Filing date: May 17, 1978
• Grant date: Jul 24, 1979
• Expiry date: May 17, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D3/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for separating, by means of a selective solvent, a mixture of C.sub.4 -hydrocarbons which contains some hydrocarbons which are more soluble in the selective solvent and some which are less soluble therein, in which process the hydrocarbon mixture is separated, in an extractive distillation zone, into a top product which contains the less soluble hydrocarbons and an extract which contains the more soluble hydrocarbons and the selective solvent, the extract, taken off as the bottom product, is subjected to a flash evaporation and the resulting vapor component of the extract is recycled to the extractive distillation zone while the liquid phase remaining after the flash evaporation is fed to a solvent recovery zone, in which the liquid phase obtained from the flash evaporation is separated into a product containing the hydrocarbons and, as the bottom product, the selective solvent which has been freed from the hydrocarbons, the resulting selective solvent is recycled to the extractive distillation zone and the product which is obtained from the solvent recovery zone and contains the hydrocarbons is partially or completely recycled to the extractive distillation zone, after i…