Process for synthesizing benzoquinones by direct oxidation of phenols

A technology of phenols and processes, applied in the preparation of oxidized quinones, organic chemistry, etc., can solve problems such as tar formation and target product yield reduction

Active Publication Date: 2012-02-01
BEIJING BOYUAN HENGSHENG HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 pro

Method used

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  • Process for synthesizing benzoquinones by direct oxidation of phenols
  • Process for synthesizing benzoquinones by direct oxidation of phenols
  • Process for synthesizing benzoquinones by direct oxidation of phenols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] In distilled water, add 5% phenol (weight ratio based on liquid phase feed), and 2.5% CuCl 2 / NaCl (molar ratio)=1: 3 mixture (weight ratio based on liquid-phase feed) as catalyzer, control reaction temperature is 70-80 ℃, and reaction pressure is 3.0-3.2MPa, respectively in reactor (below Referred to as No. 1 reactor for short), traditional reaction tower (filler and large grain copper are housed in the reaction tower, particle diameter 3-10mm) (hereinafter referred to as No. 2 reactor), reaction tower of the present invention (with copper wire as filler , the diameter of the copper wire≤2mm) (hereinafter referred to as No. 3 reactor), the reaction tower (atomized feed) of the present invention (hereinafter referred to as No. 4 reactor), the reaction tower of the present invention (with copper wire as filler , simultaneously in the reactor of atomized feed form) (hereinafter referred to as No. 5 reactor), carry out oxidation reaction with oxygen as oxygenant, and react...

Embodiment 2

[0104] The distilled water among the embodiment 1 is replaced with methyl alcohol, other conditions are constant, and reaction result is as shown in the table below:

[0105]

Embodiment 3

[0107] The distilled water among the embodiment 1 is replaced with ethanol, other conditions are constant, and reaction result is as shown in the table below:

[0108]

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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...

Claims

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Application Information

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IPC IPC(8): C07C50/04C07C46/08
Inventor 魏雄辉万明金于学春肖剑白李祥斌李秀峰户春赵传军陈井轩李小燕
Owner BEIJING BOYUAN HENGSHENG HIGH TECH
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