Process for preparing benzaldehyde by benzene oxidation and carbonylation

Abstract

The invention discloses a process for preparing benzaldehyde by benzene oxidation and carbonylation by using benzene as reaction raw material, cobalt acetate as catalyst, trichloroacetic acid as solvent, oxygen as oxidizing agentconducting oxidation carbonylation reaction at the presence of nitrogen-containing or phosphonium-containing ligand, wherein the pressure of oxygen is 4-15 atm, the pressure of carbon monoxide is 8-40 atm, the reaction temperature is 50-150 deg. C, the reaction time is 10-72 hrs.

Description

technical field [0001] The invention relates to a method for preparing benzaldehyde by oxidative carbonylation of benzene. Background technique [0002] Benzene is difficult to activate, so the selective conversion of benzene into useful compounds is of great significance. One of the target products is the selective conversion of benzene into benzaldehyde, but due to the difficulty of selectivity control in the reaction process, the implementation of this process is difficult. [0003] According to literature reports, to realize the selective oxidative carbonylation of benzene to produce benzaldehyde has the following approaches: [0004] One of the routes is realized by the electrophilic attack on the C-H bond on the benzene ring in the environment of superacid. The literature report of this route has N.Yoneda, Y.Takahashi, F.Fukuhara, A.Suzuki, Bull.Chem.Soc.Jpn.59 (1986) 2819; N.Yoneda, T.Fukuhara, Y.Takahashi, A. Suzuki, Chem.Lett.(1983) 17; I.Akhrem, A.Orlinkov, L.Af...

AI Technical Summary

Problems solved by technology

Therefore this method has low selectivity to benzaldehyde, and uses precious metal palladium as catalyst, uneconomical