Hydroquinone preparation method

A technology for hydroquinone and p-benzoquinone, applied in the field of preparing hydroquinone, can solve the problems of difficulty in industrialization, large loss of raw materials, and high production costs, and achieves the advantages of reducing production costs, reducing equipment wear, and improving product quality. Effect

Inactive Publication Date: 2012-10-10
湖北开元化工科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, all the methods mentioned above have problems such as complex operation, high reaction temperature, low product purity, large loss of raw materials, high production cost, and difficulty in realizing industrialization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add the p-benzoquinone aqueous suspension into the airtight reaction kettle, wherein the mass percent content of p-benzoquinone in the p-benzoquinone aqueous suspension is 10%, feed the inert gas argon into the reaction kettle, and replace it out of the reaction kettle In the reactor, add the palladium-carbon catalyst, wherein the mass ratio of the palladium-carbon catalyst to the benzoquinone aqueous suspension is 100:1, and pass into the reactor with hydrogen with a purity of ≥99%, to control the reaction kettle The hydrogen pressure is 0.01MPa, the reaction temperature is controlled between 30°C, and the reaction solution is stirred at the same time, the stirring speed is 80 rpm, and the reaction time is 2 hours. During the reaction, the liquid in the reactor is sampled and analyzed. When When there is no p-benzoquinone in the reaction liquid, the reaction end point is reached, the reaction liquid after the reaction is filtered, the catalyst can be reused, and the fil...

Embodiment 2

[0036] Add the p-benzoquinone aqueous suspension into the airtight reaction kettle, wherein the mass percent content of p-benzoquinone in the p-benzoquinone aqueous suspension is 5%, feed the inert gas argon into the reaction kettle, and replace it out of the reaction kettle In the reactor, add the palladium-carbon catalyst, wherein the mass ratio of the palladium-carbon catalyst to the benzoquinone aqueous suspension is 100:1, and pass into the reactor with hydrogen with a purity of ≥99%, to control the reaction kettle The hydrogen pressure is 0.01MPa, the reaction temperature is controlled between 30°C, and the reaction solution is stirred at the same time, the stirring speed is 80 rpm, and the reaction time is 2 hours. During the reaction, the liquid in the reactor is sampled and analyzed. When When there is no p-benzoquinone in the reaction liquid, the reaction end point is reached, the reaction liquid after the reaction is filtered, the catalyst can be reused, and the filt...

Embodiment 3

[0038] Add the p-benzoquinone aqueous suspension into the airtight reaction kettle, wherein the mass percent content of p-benzoquinone in the p-benzoquinone aqueous suspension is 8%, feed the inert gas argon into the reaction kettle, and replace it out of the reaction kettle In the reactor, add the palladium-carbon catalyst, wherein the mass ratio of the palladium-carbon catalyst to the benzoquinone aqueous suspension is 100:1, and pass into the reactor with hydrogen with a purity of ≥99%, to control the reaction kettle The hydrogen pressure is 0.01MPa, the reaction temperature is controlled between 30°C, and the reaction solution is stirred at the same time, the stirring speed is 80 rpm, and the reaction time is 2 hours. During the reaction, the liquid in the reactor is sampled and analyzed. When When there is no p-benzoquinone in the reaction liquid, the reaction end point is reached, the reaction liquid after the reaction is filtered, the catalyst can be reused, and the filt...

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Abstract

The invention relates to a hydroquinone preparation method, in particular to a method for producing hydroquinone by means of catalytic hydrogenation and reduction of benzoquinone. The method includes: adding hydrogenation aqueous suspension into a closed reaction kettle, feeding inert gas into the reaction kettle to replace the air out of the reaction kettle, adding palladium carbon catalyst into the reaction kettle, controlling hydrogen pressure in the reaction kettle and the reaction temperature while stirring the reaction liquid, and obtaining the hydroquinone with the purity equal to or higher than 99.0% after reaction. The hydroquinone preparation method is simple in operation, low in reaction condition, low in raw material loss and applicable to industrial production.

Description

technical field [0001] The invention relates to a method for preparing hydroquinone, in particular to a method for producing hydroquinone by catalytic hydrogenation reduction of p-benzoquinone. Background technique [0002] Hydroquinone is an important raw material, auxiliary agent and intermediate for rubber, pharmaceuticals, dyes, pesticides and fine chemicals. Catalysts, anti-aging agents for rubber and plastics, monomer polymerization inhibitors, stabilizers and antioxidants for food and paint varnishes, petroleum anticoagulants, etc. In addition, hydroquinone can be further processed into other fine chemical products, such as p-hydroxyanisole, 1,4-diaminoleuco, quinazine, etc. In recent years, the application fields of hydroquinone are gradually expanding. [0003] There are many synthetic methods of hydroquinone, and the Peppe method is a relatively early preparation method. The reaction process is roughly as follows. Under the conditions of Ru and Rh catalysts, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/08C07C37/055B01J23/89
Inventor 高士敬周治华时疆
Owner 湖北开元化工科技股份有限公司
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