A kind of synthetic method of hydroquinone

Abstract

The invention discloses a hydroquinone synthetic method. The method comprises the steps that sodium phenate is reacted with ozone on the condition that catalyst hydroxyapatite exists, and benzene quinone is obtained after reaction liquid water steam is distilled; hydroquinone is obtained after hydrogen is added into the benzene quinone on the condition that catalyst raney nickel exists. The hydroquinone synthetic method is simple in synthetic route, novel, simple in technology, high in yield and purity of products, incapable of influencing the environment, and suitable for industrial production. Moreover, catalyst is cheap and can be obtained easily.

Description

technical field [0001] The invention relates to a method for synthesizing hydroquinone. Background technique [0002] Hydroquinone is an important chemical raw material. In recent years, domestic demand for it has shown a growing trend, and the consumption field has been expanding year by year. Hydroquinone is widely used as an important raw material, intermediate and auxiliary agent for medicine, pesticide, dye and rubber. Mainly used in developers, anthraquinone dyes, azo dyes, rubber antioxidants and monomer polymerization inhibitors, food stabilizers and paint antioxidants, petroleum anticoagulants, synthetic ammonia catalysts, etc. At present, the application field of hydroquinone is gradually expanding. In addition to the application in the traditional field, there are also new developments in the fields of chemical fertilizers, water treatment, and liquid crystal polymers. [0003] The production process of hydroquinone mainly includes aniline oxidation method,...

AI Technical Summary

Problems solved by technology

However, due to the use of strong corrosive inorganic acids and high concentrations of H 2 o 2 , the process technology is relatively difficult, and there are some shortcomings that are difficult to overcome.

[0005] The Brichime method uses Fe(II) / CO(II) as a catalyst. Although this process can be produced continuously and has less waste, the conversion rate of phenol is low (10%), and the process requires the use of high concentration H2O2 (mass fraction 60%). Has been superseded by the Enichem method

[0006] The Enichem method uses titanium-silicon molecular sieves as catalysts. This process is pollution-free and uses low-concentration H2O2 (mass fraction 30%). The conversion rate of phenol (30%) and the selectivity of quinone are high. However, the synthesis of the catalyst is complicated, the price is expensive, and the reaction speed Slow, large volume of slurry bed reactor, cumbersome intermittent operation, harsh working environment, etc. affect the promotion of this technology

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