Hydroquinone synthetic method

A technology of hydroquinone and synthetic methods, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as harsh working environment, difficult technology, cumbersome intermittent operations, etc., and achieve simple and novel synthetic routes , The process is environmentally friendly, and the process is simple and feasible

Inactive Publication Date: 2013-12-04
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 Has been superseded by the Enichem method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

Method used

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  • Hydroquinone synthetic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step a, synthetic benzoquinone

[0019] Take 30 grams of sodium phenate and 3 grams of hydroxyapatite (calcium / phosphorus = 1.5) into a three-necked flask containing 100 ml of distilled water, and inject ozone generated by a gas generator at a flow rate of about 450 ml / min, 55 oC The reaction was heated for 4 hours, the pH was adjusted to 3 with dilute hydrochloric acid, and steam distilled until the distillate was colorless. After concentration, cooling and filtration, 24.8 g of p-benzoquinone was isolated from the distillate (yield: 88.8%, product purity 98.0%).

[0020] Step b, synthetic hydroquinone

[0021] Take 20 grams of p-benzoquinone, 1 gram of Raney nickel and 40 milliliters of water into a pressure reaction bottle, fill it with 5 atmospheres of hydrogen (constant pressure), 50 oC Stir the reaction for 1 hour, cool down, filter out the catalyst Raney nickel for reuse, adjust the pH value to 2 with hydrochloric acid, cool down, precipitate the crude produc...

Embodiment 2

[0023] Step a, synthetic benzoquinone

[0024] Take 100 grams of sodium phenate and 10 grams of hydroxyapatite (calcium / phosphorus = 1.3) into a three-necked flask containing 300 ml of distilled water, and inject ozone generated by a gas generator at a flow rate of about 1000 ml / min, 55 oC The reaction was heated for 6 hours, the pH was adjusted to 3 with dilute hydrochloric acid, and steam distilled until the distillate was colorless. After concentration, cooling and filtration, 79.1 g of p-benzoquinone was isolated from the distillate (yield: 85.0%, product purity 97.2%).

[0025] Step b, synthetic hydroquinone

[0026] Get 200 grams of p-quinone, 20 grams of Raney nickel and 400 milliliters of water into a pressure reaction flask, fill with 10 atmospheres of hydrogen (constant pressure), 50 oC Stir the reaction for 2 hours, cool down, filter out the Raney nickel catalyst for reuse, adjust the pH value to 2 with hydrochloric acid, cool down, precipitate the crude product...

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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,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/08C07C37/07
Inventor 蒋和雁
Owner CHONGQING TECH & BUSINESS UNIV
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