Method for separation and partial return of rhodium and catalytically effective complex compounds thereof from process streams

摘要

The invention relates to a method for separating and partially returning transition metals and/or catalytically effective complex compounds thereof from a reaction mixture by combining one at least one-stage membrane separation and an adsorption, wherein a current comprising a catalyst, comprising a transition metal, is divided over at least one one-stage membrane separation step in a transition metal enriched retentate stream that resupplies the reaction mixture and a transition metal depleted permeate stream and the transition metal depleted permeate stream is further supplied to an adsorption step. The invention further relates to a method for producing tridecanals.

主权项

1. A process for separating off and partly recirculating at least one selected from the group consisting of a transition metal and a catalytically active complex of a transition metal, from a reaction mixture, the process comprising:
separating the reaction mixture, which comprises a catalyst-comprising stream that comprises the at least one transition metal and the catalytically active complex by applying the reaction mixture to at least a single-stage membrane, to yield (i) a retentate stream enriched in transition metal, and (ii) a permeate stream depleted in transition metal but that comprises some transitional metal; returning the retentate stream to the reaction mixture; and feeding the permeate stream to an absorbent material to absorb the transitional metal.