Method for synthesizing acetylacetonatodicarbonyl rhodium

Abstract

The invention discloses a method for synthesizing acetylacetonatodicarbonyl rhodium, which comprises the following steps: (1) mixing rhodium trichloride hydrate and N,N-dimethyl formamide, heating the mixture to 120 and 150 DEG C in a protective atmosphere of nitrogen, adding diacetone after rhodium trichloride hydrate dissolves completely, heating till the refluxing reaction is accomplished completely, standing reaction solution at room temperature, cooling, adding aqueous solution of an inorganic salt or inorganic alkali or mixed aqueous solution of the inorganic salt and the inorganic alkali, precipitating, and performing the post treatment of precipitate to obtain acetylacetonatodicarbonyl rhodium; and (2) dissolving the acetylacetonatodicarbonyl rhodium prepared by the step (1) in an organic solvent, adding triphenylphosphine, starting reaction, and obtaining acetylacetonatodicarbonyl rhodium after no air bubbles escape. The method improves the step yield and single-pass total yield of product, adopts a relatively environmentally-friendly solvent, reduces production cost and has obvious economic and environmental advantages.

Description

A kind of synthetic method of triphenylphosphine carbonyl rhodium acetylacetonate (1) Technical field The invention relates to a synthesis method of a catalyst, in particular to a synthesis method of triphenylphosphinecarbonyl rhodium acetylacetonate. (2) Background technology Triphenylphosphinecarbonylrhodium acetylacetonate is the core catalyst in the low-pressure propylene hydroformylation carbonylation process to synthesize butanol and octanol. Due to the scarcity of rhodium natural resources, the price is very expensive, and there are almost no natural rhodium resources in China. Improve the synthetic yield of triphenylphosphine carbonyl rhodium acetylacetonate catalyst, reduce the synthetic cost of catalyst and become key. Triphenylphosphine carbonyl rhodium acetylacetonate was first synthesized by British chemist G.Wilkinson [BonatiF, WilkinsonG.Preparationofcarbonyl(triphenylphosphine)rhodium[J].J.Chem.Soc., 1964,3156-3159.], after M.J. Lawrenson [Lawrenson MJ. ...

AI Technical Summary

Problems solved by technology

But because rhodium is extremely expensive, and there are almost no natural resources of rhodium in the country, increasing the yield by 1 percentage point is enough to offset other costs of preparing triphenylphosphinecarbonyl rhodium acetylacetonate, and can also reduce the cost of reclaiming rhodium in the waste liquid after synthesis , so in the industrial production of triphenylphosphine carbonyl rhodium acetylacetonate catalyst, the synthesis yield is extremely important, and non-environmentally friendly solvents such as toluene or benzene are all used in the past report process, and the distillation process is required, and the steps are longer, which is harmful to the industry. Unfavorable production