Process for solvent recovery and apparatus suitable therefor

US5711873A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Siegfried Rewitzer · Ihrlerstein, DE
• Peter Roth · Eppstein, DE

Key dates

• Filing date: Sep 20, 1996
• Grant date: Jan 27, 1998
• Expiry date: Sep 20, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S55/30
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An apparatus is described for recovery and reuse of liquids which are used as solvents and for the specific dilution of the solvent in the chemical reaction and/or the processing of substances. The process includes: PA1 a) introducing fresh solvent (2) into a processing plant (3), PA1 b) introducing fresh diluent (5) into the processing plant, PA1 c) introducing substances (7) to be reacted and/or to be processed into a treatment apparatus (8) of the processing plant (3), PA1 d) ejecting products (10) from the processing plant (3), PA1 e) feeding the used mixture (12) to a solvent recovery plant (13), PA1 f) separating the mixture from step e) in the solvent recovery plant (13) into a solvent fraction (15), which is primarily composed of solvent and possibly contains a small proportion of diluent, into a diluent fraction (17), which is primarily composed of diluent and possibly contains a small proportion of solvent, and into residues from the reaction and/or processing of the substances, PA1 g) returning the solvent fraction (15) to the processing plant (3), so that this fraction is again available for the reaction and/or processing of the substances, and PA1 h) returning the dilu…