Dsm IP Assets B.v.

Holger Paschold

Christian Wandrey

Dirk Weuster-Botz

Ralf Takors

Dietrich H Maass

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

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Linnich, Germany

Holger Paschold