Apparatus and process for recovering solvents

US5231772A · kind A · utility

Assignees

• Herco-Kuhltechnik Hermans & Co. · DE
• Air Products GmbH Werk Hattigen · DE

Inventors

• Klaus Hermanns · Aßlar, DE
• Gerhard Kusenberg · Wesel, DE
• Norbert Hagenbruck · Oberhausen, DE
• Michael Karthaus · Neuss, DE

Key dates

• Filing date: Mar 20, 1992
• Grant date: Aug 3, 1993
• Expiry date: Mar 20, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F26B25/006
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A solvent recovery apparatus, in particular, for manufacturing apparatus of web-like materials, preferably sound tapes and video tapes, is equipped with a heat exchanger which returns a preferably larger portion of a gas prepurified of solvents downstream of a solvent separator via a line and heats it against the flow of the solvent-charged gas from the drier in order to return the preheated larger portion into the drier; a preferably smaller portion of the prepurified gas is freed from remaining solvent residues downstream of the solvent separator in a cryogenic apparatus, supplemented with a thereby vaporized part of inert gas in order to subsequently be supplied to transfer chambers of the drier to produce there a positive gas flow directed both into the drier and to the outside. The proposed method can be carried out on the apparatus describe.