Hydroformylation process with improved control over product...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 45/50 (2006.01)

Patent

CA 2680484

A continuous hydroformylation process for producing a mixture of aldehydes with improved flexibility and stability of a normal/branched (N/I) isomer ratio of the product aldehydes. The process involves reacting one or more olefinically-unsaturated compounds with carbon monoxide and hydrogen in the presence of an organopolyphosphite ligand and an organomonophosphite ligand, at least one of such ligands being bonded to a transition metal to form a transition metal-ligand complex hydroformylation catalyst; the process being conducted at a sub-stoichiometric molar ratio of organopolyphosphite ligand to transition metal, at a super-stoichiometric (>2/1) molar ratio of organomonophosphite ligand to transition metal, and at a carbon monoxide partial pressure in the inverse order region of the hydroformylation rate curve; and controlling and varying the N/I isomer ratio by varying the concentration of organopolyphosphite ligand relative to transition metal.

L'invention concerne un procédé continu d'hydroformylation destiné à produire un mélange d'aldéhydes avec une meilleure flexibilité et une meilleure stabilité d'un rapport d'isomères normaux/ramifiés (N/I) des aldéhydes produits. Le procédé comprend la mise en réaction d'un ou de plusieurs composés à insaturation oléfinique avec du monoxyde de carbone et de l'hydrogène en présence d'un ligand organopolyphosphite et d'un ligand organomonophosphite, au moins un de ces ligands étant relié à un métal de transition afin de former un catalyseur complexe d'hydroformylation métal de transition-ligand. Le procédé est réalisé à un rapport molaire sub-stAEchiométrique entre le ligand organopolyphosphite et le métal de transition, à un rapport molaire super-stAEchiométrique (> 2/1) entre le ligand organomonophosphite et le métal de transition et à une pression partielle en monoxyde de carbone dans la région de l'ordre inverse de la courbe du taux d'hydroformylation. Le procédé comprend également le contrôle et la variation du rapport d'isomères N/I en variant la concentration du ligand organopolyphosphite par rapport au métal de transition.

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