Method and device for comprehensively recycling catalyst mother liquor in propylene carbonylation

Abstract

The invention relates to a method for comprehensively recycling catalyst mother liquor in propylene carbonylation. The method comprises the following steps: feeding devitalized catalyst mother liquoror catalyst mother liquor with reduced activity into a first adsorption column and a second adsorption column, then feeding into a buffer tank, and feeding into a butyraldehyde removing tower via thebuffer tank; pumping a base solution of the butyraldehyde removing tower into a high polymer removing tower; pumping concentrated triphenylphosphine mother liquor on the bottom of the high polymer removing tower into a reactor and carrying out low-temperature separation by crystallization on triphenylphosphine to obtain crude triphenylphosphine; washing triphenylphosphine solid with water at first, then dissolving the triphenylphosphine solid with ethanol, and carrying out evaporative crystallization to recycle triphenylphosphine; and carrying out evaporation concentration and crystallizationon a purified rhodium trichloride solution under the condition of vacuum to obtain reddish brown rhodium trichloride crystals. Pollution to the environment due to combustion in recycling of precious metal from the catalyst mother liquor and loss of butyraldehyde and triphenylphosphine in an incineration process or a nitrifying process of the catalyst mother liquor by a large amount of waste liquidgenerated by an extraction method are solved, and effective component utilization rate of the catalyst mother liquor is increased.

Description

technical field [0001] The invention aims at the comprehensive recovery and utilization of the catalyst mother liquor used in the propylene oxo synthesis process, especially the method and device for the comprehensive recycling and utilization of the rhodium / triphenylphosphine waste catalyst mother liquor used in the industrial production process. Background technique [0002] At present, the butyl octanol industrial plant mainly adopts the low-pressure carbonylation process of propylene with the oil-soluble rhodium / triphenylphosphine complex as the catalyst. The catalyst often loses its catalytic activity due to the change of the form of the catalytic core rhodium during the reaction process and the The presence of impurities generates new complexes, causing the rhodium-phosphine complex catalyst to lose its catalytic activity and become a spent catalyst mother liquor. Therefore, the spent catalyst mother liquor produced in the propylene carbonylation process often contains...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for comprehensive recycling of rhodium inactivated catalyst mother liquor at low concentrations used in the propylene oxo process, which solves the problems existing in the recovery process of rhodium in the previous deactivated catalyst and the catalyst Recovery and Utilization of Triphenylphosphine in Mother Liquor

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