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Method for preparing hydroquinone

A technology for hydroquinone and p-benzoquinone, applied in the field of preparing hydroquinone, can solve the problems such as the limitation of increasing equipment and output, large amount of palladium-carbon catalyst, unfavorable production efficiency and yield, etc., to improve catalytic efficiency and product yields, reduced equipment and yield constraints, strong feasibility and practicality

Active Publication Date: 2014-09-10
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the following disadvantages: a large amount of iron powder is used and it is difficult to recycle, and consumes a large amount of iron resources; iron powder is discharged into the environment in the form of iron sludge, causing soil salinization, which is not conducive to crop growth and pollutes the environment; Ions enter rivers with rainwater and seep into groundwater, threatening the safety of industrial water and affecting people's quality of life; the use of hydrochloric acid not only corrodes production equipment, but also seriously threatens personal safety
However, the method still has the following problems: on the one hand, the amount of palladium-carbon catalyst is relatively large, which not only increases the cost, but also increases the limitation on equipment and output; on the other hand, the reaction efficiency of palladium-carbon catalyst is low and the uniformity is insufficient , which is not conducive to the improvement of production efficiency and yield; in particular, the method does not disclose the yield of hydroquinone prepared

Method used

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  • Method for preparing hydroquinone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In autoclave, add 0.050g p-benzoquinone; In autoclave, add catalyst water-soluble ruthenium complex [RuCl 2 (TPPTS) 2 ] 2 , the water-soluble ruthenium complex [RuCl 2 (TPPTS) 2 ] 2 The mol ratio with described p-benzoquinone is 1:400; In autoclave, add 0.1ml sulfuric acid (0.5mol / L), and add distilled water and the pH value of medium solution is controlled to be 1; Pass in autoclave Enter inert gas to replace the air in it; feed hydrogen with a purity greater than 99% into the autoclave, and control the hydrogen pressure in the autoclave to be 1.0MPa; control the reaction temperature to 40°C; at the same time, the solution in the autoclave is For stirring treatment, the stirring speed is controlled to be 120 rpm, and the reaction time is controlled to be 90 minutes. After the reaction was finished, the mixture was allowed to stand and separated, and the hydroquinone product was obtained from the upper organic phase. The yield of hydroquinone obtained by Example 1...

Embodiment 2

[0038] In autoclave, add 0.050g p-benzoquinone; In autoclave, add catalyst water-soluble ruthenium complex [RuCl 2 (TPPTS) 2 ] 2 , the water-soluble ruthenium complex [RuCl 2 (TPPTS) 2 ] 2 The mol ratio with described p-benzoquinone is 1:400; In autoclave, add 0.1ml hydrochloric acid (1.0mol / L), and add distilled water and the pH value of medium solution is controlled to be 1; Pass in autoclave Enter inert gas to replace the air in it; feed hydrogen with a purity greater than 99% into the autoclave, and control the hydrogen pressure in the autoclave to be 1.0MPa; control the reaction temperature to 40°C; at the same time, the solution in the autoclave is For stirring treatment, the stirring speed is controlled to be 120 rpm, and the reaction time is controlled to be 90 minutes. After the reaction was finished, the mixture was allowed to stand and separated, and the hydroquinone product was obtained from the upper organic phase. The yield of hydroquinone obtained by Examp...

Embodiment 3

[0040] In autoclave, add 0.050g p-benzoquinone; In autoclave, add catalyst water-soluble ruthenium complex [RuCl 2 (TPPTS) 2 ] 2 , the water-soluble ruthenium complex [RuCl 2 (TPPTS) 2 ] 2 The mol ratio with described p-benzoquinone is 1:300; In autoclave, add 0.1ml sulfuric acid (0.5mol / L), and add distilled water and the pH value of medium solution is controlled to be 3; Pass in autoclave Enter inert gas to replace the air in it; feed hydrogen with a purity greater than 99% into the autoclave, and control the hydrogen pressure in the autoclave to be 1.0MPa; control the reaction temperature to 40°C; at the same time, the solution in the autoclave is For stirring treatment, the stirring speed is controlled to be 120 rpm, and the reaction time is controlled to be 100 minutes. After the reaction was finished, the mixture was allowed to stand and separated, and the hydroquinone product was obtained from the upper organic phase. The yield of hydroquinone obtained by Example ...

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Abstract

The invention relates to a method for preparing hydroquinone. According to the method, a water-soluble ruthenium complex (RuCl<2>(TPPTS)<2>)<2> is used as a catalyst, in a medium with a pH value of 0-4, the hydroquinone is prepared by reducing p-benzoquinone through catalytic hydrogenation, and reaction time is controlled to range from 10 minutes to 100 minutes; after the reaction is finished, the yield of the hydroquinone is larger than 85%, and the catalyst can be reused. The method greatly lowers the amount of the recoverable catalyst and remarkably reduces the cost; the catalytic efficiency and the reaction uniformity are improved by the adoption of the homogeneous catalyst, the reaction is sped up on the acidic condition, and the preparing time is shortened; the catalyst and the product are convenient to separate, the catalyst is capable of being reused, economical and environmentally friendly, and operation is easy and convenient to carry out.

Description

technical field [0001] The present invention relates to the method for preparing hydroquinone, in particular to a method using water-soluble ruthenium complex [RuCl 2 (TPPTS) 2 ] 2 A method for preparing hydroquinone by catalytic hydrogenation reduction of p-benzoquinone. Background technique [0002] Hydroquinone is an important fine chemical raw material. In recent years, domestic demand for it has shown a growing trend, and its application and consumption fields have been expanding year by year. Hydroquinone is an important raw material, intermediate and auxiliary agent of medicine, pesticide, dyestuff, rubber, etc., especially in addition to the application in the above-mentioned traditional fields, it has also been used in sewage treatment, crystalline polymer, chemical fertilizer and other fields recently. new development. [0003] The hydroquinone synthetic method that has realized industrialization mainly includes following several kinds at present: [0004] (1)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/07C07C39/08B01J31/24
CPCC07C37/07C07C39/08
Inventor 袁果园熊伟刘德蓉李霞冯建王金波
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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