Catalyst preparation process

摘要

A process for forming a catalyst from a catalytic metal precursor, a chelating bisphosphite and a bulky monophosphite, with a slightly greater than stoichiometric amount of chelating bisphosphite relative to catalytic metal under a CO partial pressure at least 25 psig.

主权项

1. A process comprising (A) forming a hydroformylation catalyst by contacting under reaction conditions, in the presence of a solvent, a catalytic metal precursor, at least one organopolyphosphite ligand, CO, hydrogen, a bulky organomonophosphite ligand and, optionally, an olefin, wherein: the molar organopolyphosphite-to-catalytic metal ratio is greater than 1 but less than 2; the partial pressure of carbon monoxide is at least 25 psig; and the molar ratio of bulky organomonophosphite-to-catalytic metal is from 5:1 to 50:1; and then (B) allowing the organopolyphosphite ligand concentration to diminish such that the ratio of organopolyphosphite ligand-to-catalytic metal falls to less than 1, wherein the contacting is conducted such that the bulky organomonophosphite is introduced at the same time or after the organopolyphosphite ligand.