Process for the separation of organic substances from an aqueous mixture

US6793825B2 · kind B2 · utility

Assignee

• DSM IP ASSETS B.V. · NL

Inventors

• Dietrich Maass · Havixbeck, DE
• Dirk Weuster-Botz · Munich, DE
• Ralf Takors · Düren, DE
• Christian Wandrey · Jülich, DE
• Holger Paschold · Linnich, DE

Key dates

• Filing date: Oct 29, 2001
• Grant date: Sep 21, 2004
• Expiry date: Jul 17, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C227/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for separating from an aqueous mixture one or more organic substances containing at least one positively charged and/or chargeable nitrogenous group by means of extraction via at least one porous membrane, wherein use is made of an extraction agent which contains at least partially relatively long-chain organic compounds and at least one liquid cation exchanger, and of a membrane that is wettable by either the aqueous mixture or by the extraction agent. In particular, the invention relates to a process for separating from an aqueous mixture one or more organic substances containing at least one positively charged and/or chargeable nitrogenous group by means of extraction via at least one porous membrane, wherein the aqueous mixture is drawn from a reservoir 1, led across a first porous membrane 3 which is wettable by either the aqueous mixture or by an extraction agent 5 which contains at least partially relatively long-chain organic compounds and at least one liquid cation exchanger, extracted with the extraction agent 5, the aqueous retentate is returned to the reservoir, the extracted organic substances are led across a second porous me…