RU2020140305A - METHODS FOR SLOWING CATALYST DEACTIVATION AND/OR SLOWING TETRAPHOSPHINE LIGAND CONSUMPTION IN HYDROFORMYLATION PROCESSES - Google Patents

Claims (16)

1. A method for slowing down catalyst deactivation and/or slowing down the consumption of a tetraphosphine ligand in a hydroformylation process, comprising: (a) contacting an olefin with carbon monoxide, hydrogen and a catalyst containing (A) a transition metal, (B) a tetraphosphine having the following structure:

, where each P is a phosphorus atom and each R1-R46 is independently hydrogen, a C1-C8 alkyl group, an aryl group, an alkaryl group, or a halogen, and optionally (C) a monophosphine having the following structure:

, where P represents a phosphorus atom, and each of Y1-Y3 independently represents an aryl group, an alkaryl group, a cycloalkyl group, a C3-C8 benzyl group, an alkyl group, an alkoxy group of 1-8 carbon atoms, an aryloxy group, or a halogen, and the specified contacting is carried out in one or more reaction zones and under hydroformylation conditions; and (b) adding to the reaction zone an additional amount of monophosphine having the above structure. 2. The method according to p. 1, characterized in that the monophosphine is triphenylphosphine. 3. The method according to p. 1, characterized in that the monophosphine is a bulk monophosphine. 4. A process according to any one of the preceding claims, characterized in that the transition metal contains rhodium. 5. The method according to any one of the preceding claims, characterized in that each of R1-R46 is hydrogen. 6. Process according to any one of the preceding claims, characterized in that the olefin is propylene. 7. The method according to p. 1, characterized in that the decrease in the rate of hydroformylation over time is less than in the method carried out under the same conditions, but without monophosphine. 8. The method according to claim 1, characterized in that the rate of consumption of tetraphosphine ligand in the hydroformylation process is lower than in the hydroformylation process carried out under the same conditions, but without monophosphine. 9. A process according to any one of the preceding claims, characterized in that the amount of added monophosphine is at least 40 moles of phosphine per mole of transition metal. 10. A process according to any of the preceding claims, wherein the amount of monophosphine added to the reaction zone is more than 1.5 percent by weight relative to the reaction medium in the reaction zone, based on the total weight of the reaction medium in the reaction zone.