Process for synthesizing benzoquinones by direct oxidation of phenols

Abstract

The invention discloses a process for synthesizing benzoquinone substances by direct oxidation of phenol substances. The synthesis process comprises the following steps of: dissolving the phenol substances serving as raw materials in a liquid solvent, and directly oxidizing the phenol substances into the corresponding benzoquinone substances by using oxygen-containing gas under the catalysis of a solid catalyst and / or a catalyst capable of being dissolved in a liquid medium. The process is characterized in that: because a reaction tower provided with an atomizing nozzle and / or a bulk copper wire filler is adopted, the liquid and the gas are fully contacted and uniformly mixed in the reaction tower, the gas and the liquid have as large inter-phase boundary as possible, the comprehensive rate of reaction is improved, side reaction is reduced, and the selectivity of the benzoquinone substances serving as target products is improved; and the whole process can be continuously operated, and can also be intermittently operated. The generated benzoquinone substances can be further reduced into benzenediols (catechol and / or hydroquinone) by using traditional reduction methods.

Description

technical field [0001] The invention relates to a process for synthesizing benzoquinones from phenolic substances, in particular to a process for directly oxidizing phenolic substances to synthesize benzoquinones. Background technique [0002] Benzoquinone and quinone are important chemical, chemical, pharmaceutical and pesticide intermediates, including catechol, hydroquinone, resorcinol, p-benzoquinone and o-benzoquinone, which are in short supply at home and abroad The chemical products, especially o- and resorcinol, are seriously in short supply in China; it is estimated that the consumption of quinone in the world will grow at an average annual rate of 3%. [0003] Although China's phenol research and development was earlier, due to backward technology and slow development, it developed rapidly in the middle and late 1990s. Before 1999, China’s catechol had always relied on imports. As many Chinese scientific research institutes conquered the use of phenol as a raw mat...

AI Technical Summary

Problems solved by technology

[0040] However, the preparation process in the prior art all has side reactions such as tarring in the reaction process, which brings adverse effects such as the reduction of the yield of the target product to the entire reaction.

Images