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Technology for preparing hydroquinone through diazotation hydrolysis method

A technology of hydroquinone and hydrolysis method is applied in the field of preparing hydroquinone by diazo hydrolysis method, which can solve the problems of complex production process of hydroquinone, difficulty in conforming to human beings, large environmental pollution and the like, and achieves easy availability of raw materials, The effect of good use effect and low equipment investment

Inactive Publication Date: 2014-10-08
安徽佑骏商品混凝土有限公司
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Problems solved by technology

The traditional production process of hydroquinone is relatively complicated, causing great environmental pollution, and the production purity is relatively low, which is difficult to meet the needs of human beings

Method used

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Embodiment Construction

[0025] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0026] A kind of technology that hydroquinone is prepared by diazonium hydrolysis method comprises the following processing steps,

[0027] (1) Diazotization reaction

[0028] a. Put 15% concentration of sulfuric acid and 98% p-aminophenol into the reaction kettle and stir, then lower the temperature to -5-0°C.

[0029] b. Add a 40% aqueous solution of sodium nitrite dropwise to the temperature inside the kettle, and add dropwise for 30 to 45 minutes.

[0030] c. After the dropwise addition, keep warm for 30 minutes, and add urea therein and stir again for 15 minutes.

[0031] d. When the release of nitrogen in the kettle is not obvious, add thiourea into the kettle and continue to stir for 15 minutes to obtain a dark brown diazonium liquid, whi...

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Abstract

A technology for preparing hydroquinone through a diazotation hydrolysis method relates to the technical field of the chemical industry. The technology comprises the following steps: reacting a diazo liquid obtained after a reaction of sulfuric acid, p-aminophenol, sodium nitrite, urea and thiourea with sulfuric acid with the concentration of 30%, extracting, and processing to obtain hydroquinone. The technology has the advantages of convenient and simple preparation, environmental protection, no pollution, easily available materials, less equipment investment, high purity and convenient operation, and the prepared hydroquinone has the advantages of good use effect, safety and reliability.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a process for preparing hydroquinone by diazo hydrolysis. Background technique [0002] Hydroquinone, organic compound, white crystal, flammable in case of open flame or high heat. Combustion is decomposed into carbon monoxide and carbon dioxide. It can react with strong oxidants, and release toxic gas when it is decomposed by high heat. It has a wide range of uses: 1. Hydroquinone is mainly used as a photographic developer. Hydroquinone and its alkylate are widely used as polymerization inhibitors added during monomer storage and transportation, and the commonly used concentration is about 200ppm. Hydroquinone monomethyl ether is an intermediate of edible oil antioxidant BHA; hydroquinone dimethyl ether is an intermediate of dyes, organic pigments and spices; hydroquinone diethyl ether is an intermediate of photosensitive pigments and dyes . Hydroquinone is also us...

Claims

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Application Information

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IPC IPC(8): C07C39/08C07C37/045C07C37/70C07C37/84
CPCC07C37/045C07C245/12C07C39/08
Inventor 刘超金士明赵秀进常好银
Owner 安徽佑骏商品混凝土有限公司
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