C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 47/02 (2006.01) B01J 31/40 (2006.01) C07C 45/50 (2006.01) C07C 45/79 (2006.01) C07C 47/347 (2006.01) C07F 9/02 (2006.01) C07F 9/50 (2006.01)
Patent
CA 2212535
The invention relates to a process for separating off phosphine oxides and alkylarylphosphines from the organic reaction mixture of a homogeneous hydroformylation carried out with the use of a catalyst system, which reaction mixture contains organometallic complex compounds and, in a molar excess, ammonium salts of aromatic phosphines as ligands. The process comprises subjecting the organic reaction mixture to an extractive treatment with a 0.001 - 0.5% strength by weight alkali metal hydroxide or alkaline earth metal hydroxide solution and then separating off the aqueous phase containing the phosphine oxides and alkylarylphosphines. By employing the extraction according to the invention it is possible to decrease markedly the concentration of the phosphine oxides and alkylarylphosphines in the hydro-formylation mixture. The process is suitable, in particular, for continuously operated hydroformylations.
Procédé pour séparer des oxydes de phosphine et les alkylarylphosphines du mélange organique réactionnel d'une hydroformylation homogène en présence d'un système catalytique; ce mélange renferme des complexes organométalliques et un excès molaire de sels d'ammonium de phosphine aromatique, comme ligands. Le procédé consiste à soumettre le mélange organique réactionnel à une extraction avec une solution renfermant de 0,001 à 0,5 % en poids d'un hydroxyde de métal alcalin ou alcalino-terreux, puis à séparer la phase aqueuse contenant les oxydes de phosphine et les alkylarylphosphines. Avec la méthode d'extraction de l'invention, il est possible de réduire sensiblement la concentration des oxydes de phosphine et des alkylarylphosphines dans le mélange d'hydroformylation. Le procédé est adaptable, notamment aux hydroformylations en continu.
Bahrmann Helmut
Muller Thomas
Celanese Gmbh
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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