Preparation of acetylacetonato carbonyl rhodium and method for synthesizing butyraldehyde from propylene carbonyl

Abstract

The method comprises the following steps: stirring and mixing rhodium hydroxide and acetylacetone, heating to a reflux temperature, reacting, adding aromatic aldehyde after the system becomes brown yellow from light yellow, and continuously reacting at the reflux temperature, so as to obtain the acetylacetone carbonyl rhodium. After the reaction is finished, adding absolute ethyl alcohol, filtering, washing a filter cake with absolute ethyl alcohol, and carrying out vacuum drying on the filter cake to obtain carbonyl rhodium acetylacetonate; the acetylacetonatocarbonyl rhodium prepared by the method and triphenylphosphine are dissolved in liquid-phase propane, carbon monoxide and hydrogen are introduced into a hydroxyl synthesis kettle for hydroxyl synthesis reaction, and finally butyraldehyde is prepared. The preparation method provided by the invention can be used for preparing acetylacetone carbonyl rhodium without chlorine impurities causing poisoning of the catalyst, and acetylacetone is both a reactant and a solvent in the reaction, so that no side reaction occurs, and the obtained acetylacetone carbonyl rhodium product is high in purity and can be directly applied to a reaction for synthesizing butyraldehyde through carbonyl of propylene without a recrystallization process.

Description

technical field [0001] The invention relates to the field of precious metal catalyst synthesis, in particular to the preparation of rhodium acetylacetone carbonyl and a method for synthesizing butyraldehyde by propylene carbonyl. Background technique [0002] Acetylacetone carbonyl rhodium is a ligand-coordinated chelated rhodium organic compound, which can be directly used to catalyze the hydroformylation of olefins when the corresponding ligand is used. Hydroformylation, also known as oxo, is an industrial method for preparing aldehydes by reacting olefins with hydrogen and carbon monoxide under high pressure (10-100 atm) heating (40-200 °C) and metal catalysis. Rhodium acetylacetonate carbonyl is usually prepared from water and rhodium trichloride. According to the preparation method of a kind of acetylacetonate dicarbonyl rhodium disclosed in CN102030781A, hydrated rhodium trichloride is dissolved in methanol or ethanol solution, the temperature is raised to 80 ° C and ...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of one-step synthesis high-yield, the preparation method of rhodium carbonyl acetylacetonate with low chlorine content for the technical problem that above-mentioned rhodium carbonyl acetylacetonate preparation process flow is long, aftertreatment is complicated, product chlorine content is high, Simultaneously also provide a kind of method that utilizes the rhodium acetylacetonate carbonyl prepared by this method to catalyze the carbonylation of propylene to butyraldehyde

Images