Verfahren zur Trennung von Substanzen mittels einer geeigneten Membran

摘要

In catalytic reactions and reactions requiring synthesis-promoters, it is useful to be able to separate the promoter from the product formed and thus make it available for recycling. One possible way of achieving this separation is by immobilising the synthesis-promoter on special carriers. This, however, often reduces the contact area between the promoter and carrier and thus markedly reduces the reactivity of the promoter or alters its mode of action. The immobilisation process itself may also present problems in terms of working time spent and catalyst loss. If the product and promoter in a catalytic reaction are separated by filtration using a nanofiltration or reverse osmosis membrane, it is possible, even when the weight differences between promoter and product are relatively small and provided that the retension differences are sufficient and the associated recovery rate of the promoter therefore high, to dispense with separation based on immobilisation techniques. The process proposed can be used for separating reaction mixtures for catalytic reactions with the aim of efficiently producing organic synthesis products or optically active organic compounds.