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Method for simultaneously producing hydroquinone and catechol

A technology for hydroquinone and catechol, which is applied in the field of simultaneous production of hydroquinone and catechol, can solve the problems of high content of benzoquinone and needs to be further improved, and achieves that the preparation method is simple and easy to popularize. Application, Environmentally Friendly Effects

Active Publication Date: 2013-01-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing main problem of using titanium-silicon molecular sieve as a catalyst to catalyze the oxidation reaction of phenol is that the content of by-product benzoquinone in the product is relatively high, that is, the selectivity of hydroquinone and catechol is still low. to be further improved

Method used

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  • Method for simultaneously producing hydroquinone and catechol
  • Method for simultaneously producing hydroquinone and catechol
  • Method for simultaneously producing hydroquinone and catechol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0022] According to one embodiment of the present invention, the preparation method of the catalyst may include: contacting the heteroatom molecular sieve with a solution containing the zinc compound, loading the solution on the heteroatom molecular sieve and drying, The raw material containing the zinc compound and the heteroatom molecular sieve is obtained, and the raw material is calcined, so as to obtain the catalyst used in the method according to the present invention.

[0023] According to the present invention, the solvent of the solution containing the zinc compound may be various solvents capable of dissolving the zinc compound. According to the present invention, the zinc compound is usually soluble in water, and from the viewpoints of environmental protection and energy saving, the solvent is preferably water.

[0024] According to the present invention, the method of contacting the heteroatom molecular sieve with the solution containing the zinc compound can be a ...

Embodiment 1

[0049] This example is used to illustrate the method for simultaneous production of hydroquinone and catechol according to the present invention.

[0050] Mix 10g of zinc oxide with 50g of titanium-silicon molecular sieve (the titanium-silicon molecular sieve is TS-1 titanium-silicon molecular sieve, wherein the molar ratio of silicon atoms to titanium atoms is 56:1), and the obtained mixture is heated in an air atmosphere at 550° C. Calcined at a temperature of 5 hours to obtain catalyst A. In the catalyst A, the molar ratio of zinc atoms to titanium atoms is 5:1.

[0051] Phenol, hydrogen peroxide, methanol and catalyst A were reacted in an autoclave at a temperature of 30° C. and a pressure of 1.2 MPa for 2 hours. Wherein, the molar ratio of phenol to hydrogen peroxide is 1:2, the mass ratio of methanol to catalyst A is 20:1, and the mass ratio of phenol to catalyst A is 10:1. After 2 hours of reaction, the results were as follows: the conversion rate of phenol was 68%, t...

Embodiment 2

[0053] This example is used to illustrate the method for simultaneous production of hydroquinone and catechol according to the present invention.

[0054] Take by weighing 20g titanium-silicon molecular sieve (this titanium-silicon molecular sieve is TS-1 titanium-silicon molecular sieve, wherein, the molar ratio of silicon atom and titanium atom is 39: 1), with the aqueous solution of 20 milliliters of zinc carbonates (containing 2g zinc carbonate) at 25 The titanium-silicon molecular sieve was impregnated at 25° C. for 2 hours, dried at 25° C. for 10 hours, and then calcined at 650° C. for 2 hours in an air atmosphere to obtain catalyst B. In this catalyst B, the molar ratio of zinc atoms to titanium atoms is 2:1.

[0055] Phenol, hydrogen peroxide, acetone and catalyst B were reacted in an autoclave at a temperature of 60° C. and a pressure of 2 MPa for 2 hours. Wherein, the molar ratio of phenol to hydrogen peroxide is 1:1, the mass ratio of acetone to catalyst B is 5:1, ...

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Abstract

The invention relates to a method for simultaneously producing hydroquinone and catechol. The method includes allowing contact of phenol and oxidant in the presence of catalyst under oxidation reaction condition, wherein the catalyst is roasted product of raw material containing heteroatom molecular sieve and zinc compound. The inventive method adopts the roasted product of raw material containing heteroatom molecular sieve and zinc compound as the catalyst of phenol oxidation, and can remarkably improve contents of hydroquinone and catechol in oxidation product of phenol, i.e., it can remarkably improve selectivity to hydroquinone and catechol and reduce content of benzoquinone in the product. Furthermore, according to the catalyst used in the method, its preparation method is simple. In addition, the inventive method is simple, easy and environment friendly.

Description

technical field [0001] The present invention relates to a method for simultaneously producing hydroquinone and catechol. Background technique [0002] Hydroquinone and catechol are two important chemical raw materials and chemical intermediates, which have a wide range of uses. Catechol can be used as rubber hardener, electroplating additive, skin antiseptic and fungicide, hair dye, photographic developer, color photo antioxidant, fur dyeing developer, paint and varnish anti-peeling agent. Hydroquinone is mainly used as developer, anthraquinone dye, azo dye, synthetic ammonia co-solvent, rubber anti-aging agent, polymerization inhibitor, stabilizer and antioxidant for paint and fragrance. [0003] Therefore, it is of great practical significance to research and develop new processes for the preparation of hydroquinone and catechol which are environmentally friendly and simple in process. [0004] Titanium-silicon molecular sieve is a new type of catalytic oxidation materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/08C07C37/60B01J29/89
CPCY02P20/52
Inventor 史春风林民朱斌汝迎春
Owner CHINA PETROLEUM & CHEM CORP