Regeneration method of inactivated rhodium complex catalyst used for carbonyl reaction

Abstract

The invention belongs to the technical field of the catalyst regeneration, and particularly relates to a regeneration method of an inactivated rhodium complex catalyst used for a carbonyl reaction. The regeneration method of the inactivated rhodium complex catalyst comprises the steps of: firstly mixing a reaction liquid containing an inactivated rhodium complex catalyst with alkynol or ester containing 3-6 carbon atoms, and carboxylic acid, and carrying out the regeneration reaction in the existence of hydrogen or nitrogen at the reaction pressure of 0.1-1.0MPa; then adding an aqueous tertiary alkanol amine solution into the obtained reaction liquid, neutralizing unreacted carboxylic acid or halide to generate water soluble salt; then carrying out the settlement separation to obtain an organic phase containing a rhodium complex catalyst; and washing the organic phase with water to obtain a solution containing the rhodium complex catalyst, the catalytic activity of which is higher than the catalytic activity of the existing inactivated rhodium catalyst. The regeneration method of the inactivated rhodium complex catalyst solves the polymerization problem in the regeneration process of the alkynol or the ester containing 3-6 carbon atoms. The regeneration method of the inactivated rhodium complex catalyst has the advantages of low reagent dosage, mild reaction conditions, easiness in technological process, and high generated catalyst activity, and also has the advantage that the regeneration method of the inactivated rhodium complex can carry out online regeneration of the catalyst under the condition that the carbonyl reaction can be continuously carried out without any pauses.

Description

technical field [0001] The invention belongs to the technical field of catalyst regeneration, in particular to a method for regenerating a deactivated or partially deactivated rhodium complex catalyst used in a carbonylation reaction. 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 complex catalyst loses or partially deactivates even in the substantially absence of exogenous catalyst poisons. The comprehensive effect of reaction process conditions such as reaction temperature, reactant partial pressure, phosphine ligand / rhodium molar ratio, rhodium concentration, etc.,...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a catalyst regeneration method that is easy to implement industrially for the deactivated carbonylation reaction catalyst in the existing production equipment. The problem of easy polymerization of medium reactants, high catalyst activity after regeneration

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