Treatment method of inactivated rhodium-phosphine catalyst

Abstract

The invention belongs to the technical field of treatment of catalysts and particularly relates to a treatment method of an inactivated or partially inactivated rhodium-phosphine catalyst by carbonylation. The treatment method comprises the following steps: firstly mixing a reaction solution containing the inactivated or partially inactivated rhodium-phosphine catalyst with alkynol containing 3-6 carbon atoms or ester and carboxylic acid with the chemical formula of RCOOH for performing activation reaction; then performing oxidation reaction in the presence of an oxidant, and adding a water solution of tertiary alkanolamine into the obtained reaction solution and generating a water-soluble salt; and performing settling separation so as to obtain an organic phase containing a rhodium-phosphine complex catalyst, washing the organic phase with water and obtaining a solution containing the rhodium-phosphine complex catalyst, which has catalytic activity higher than that of the inactivated rhodium-phosphine catalyst. According to the treatment method, the inactivated rhodium-phosphine catalyst is treated by a combined process method of activation and oxidation, so that the inactivation of the catalyst, which is mainly caused by the formation of a rhodium cluster compound is obviously improved, and the activity of the treated rhodium-phosphine catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of catalyst treatment, in particular to a treatment method for deactivated or partially deactivated rhodium-phosphine catalysts in carbonylation reactions. Background technique [0002] The "OXO" reaction is the oxo synthesis reaction, also known as the hydroformyl reaction or hydroformylation reaction. In the low-pressure carbonylation process of aldehydes, the catalyst used in the reaction process is a rhodium-phosphine catalyst system. Using this catalyst, the reaction pressure is low and side reactions are few, which are well known in the art. However, as the continuous oxo reaction proceeds, the rhodium-phosphine catalyst loses or partially deactivates even in the substantial absence of exogenous catalyst poisons. The combined effect of reaction process conditions such as reaction temperature, reactant partial pressure, phosphine ligand / rhodium molar ratio, rhodium concentration, etc., can lead to the...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a catalyst treatment method that can restore the activity of some rhodium cluster compounds and is easy for industrial implementation, and fundamentally improve the deactivation The catalytic activity of the active rhodium phosphine catalyst, the whole treatment process is simple and easy, and the loss of rhodium is small

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