Method for digesting spent rhodium catalyst in carbonyl group synthetic reaction

Abstract

The invention discloses a method for digesting spent rhodium catalyst in carbonyl group synthetic reaction, which is characterized by adding concentrated sulfuric acid into the spent rhodium catalyst in carbonyl group synthetic reaction for carbonization; and then adding alkali metal nitrate solid for digestion until solution of a system is clear and transparent; at this moment, organic matters are digested and removed in a format of carbon dioxide, and rhodium exists in acidic solution in a format of soluble salt. The method disclosed by the invention is high in recovery rate of rhodium, environment-friendly, moderate in operating condition, and high in efficiency.

Description

Technical field:

[0001] The invention relates to the technical field of catalysis; it is a method for digestion of spent rhodium catalysts for oxo synthesis reactions, more precisely, it provides a method for eliminating organic components in waste rhodium catalysts for oxo synthesis reactions and turning rhodium into soluble salts . Background technique:

[0002] Carbonylation is an extremely important reaction in the chemical industry, including carbonylation of olefins to aldehydes, carbonylation of methanol to acetic acid, carbonylation of methyl acetate to acetic anhydride, etc. Rhodium-phosphine complex catalysts are the most commonly used catalysts for carbonylation reactions. In industrial production operations, rhodium-phosphine complex catalysts are often deactivated due to the presence of various high-boiling by-products and impurities in the raw materials during the reaction. Because rhodium resources are scarce and expensive, it is extremely important in indust...