The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 2004
Filed:
Oct. 29, 2001
Dietrich H. Maass, Altenberge-Hansell, DE;
Dirk Weuster-Botz, Dachau, DE;
Ralf Takors, Merzenich, DE;
Christian Wandrey, Jülich, DE;
Holger Paschold, Linnich, DE;
DSM IP Assets B.V., Heerlen, NL;
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 , led across a first porous membrane which is wettable by either the aqueous mixture or by an extraction agent which contains at least partially relatively long-chain organic compounds and at least one liquid cation exchanger, extracted with the extraction agent , the aqueous retentate is returned to the reservoir, the extracted organic substances are led across a second porous membrane which is wettable by either the aqueous mixture or by the extraction agent and there re-extracted into an aqueous phase