Method for reprocessing solvent mixtures containing constituents of low volatility and apparatus suitable therefor

US5462643A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Georg-Emerich Miess · Regensburg, DE
• Peter Roth · Eppstein, DE
• Karl Heinrich · Großaitingen, DE
• Siegfried Rewitzer · Ihrlerstein, DE

Key dates

• Filing date: Jun 9, 1994
• Grant date: Oct 31, 1995
• Expiry date: Jun 9, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/09
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Reprocessing mixtures which contain organic solvents and constituents of low volatility and may contain water: includes introducing the mixture into a concentration apparatus of a solvent recovery system, concentrating the mixture in the concentration apparatus by evaporating off a portion of a readily volatile fraction and feeding this readily volatile fraction to a separation column. A portion of the concentrated mixture from the concentration apparatus is conducted away into a separation apparatus where the constituents of low volatility are separated off from the concentrated mixture and ejected from the solvent recovery system. The concentrated mixture is conducted away, freed from the constituents of low volatility, from the separation apparatus.