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Process for catalyzing oxidating synthesizing 2,5-dichlorophenol

A technology for catalytic oxidation and dichlorophenol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as large environmental pollution, complicated process, long reaction route, etc.

Inactive Publication Date: 2006-06-28
SHENYANG RES INST OF CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods all have common shortcomings, that is, the reaction route is long, the process is complicated, the equipment is corroded seriously, and a large amount of waste acid or waste alkali will remain after the reaction, which will cause great environmental pollution.

Method used

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  • Process for catalyzing oxidating synthesizing 2,5-dichlorophenol
  • Process for catalyzing oxidating synthesizing 2,5-dichlorophenol

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Embodiment Construction

[0025] The present invention will be further described below in combination with specific embodiments.

[0026] 1) Preparation of heteropolyacid:

[0027] a)H 4 SiMo 12 o 40 preparation of

[0028] 50g Na 2 MoO 4 2H 2 O (0.21mol) was dissolved in 200ml of water, and the solution was heated to 80°C, 20ml of concentrated hydrochloric acid was added to the solution, and sodium metasilicate solution (0.045mol) was added dropwise within 30min under vigorous stirring, at this time the solution turned yellow, Continue to stir, add 60ml of concentrated hydrochloric acid dropwise with a dropping funnel, extract the filtrate with ether after cooling, volatilize the ether to obtain heteropolyacid H 4 SiMo 12 o 40 .

[0029] b)H 4 SiW 12 o 40 preparation of

[0030] 20gNa 2 WO 4 2H 2O (0.061mol) was dissolved in 40ml of water, then 0.0071mol of sodium metasilicate was added to the solution, the mixture was stirred and heated to boiling, 12ml of concentrated hydrochloric a...

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Abstract

The invention relates to a method to compound 2, 5-dichlorophenol by catalytic oxidation. The feature is that 1, 4-dichlorobenzene adopts heteropolyacid, heteropolyacid salt or the load of heteropolyacid as catalyst, uses H2O2 as oxidant to take catalytic oxidation reaction solution. After reacting, decreasing pressure and distilling, the 2, 5-dichlorophenol would be gained. The method has short reaction way, simple technology, and is benefit to environment protection.

Description

technical field [0001] The invention belongs to the technical field of compound preparation methods, in particular to a method for synthesizing 2,5-dichlorophenol by catalytic oxidation. Background technique [0002] 2,5-Dichlorophenol is an important pesticide intermediate, nitrogen fertilizer synergist and leather anti-enzyme agent. Synthesis of 3,6-dichlorosalicylic acid from 2,5-dichlorophenol, followed by O-alkylation can prepare 3,6-dichloro-2-methoxybenzoic acid. 3,6-Dichloro-2-methoxybenzoic acid is a benzoic acid series herbicide, the trade name is Dicamba, which is mainly used for the control of annual or perennial broad-leaved weeds in grass crop fields such as wheat . [0003] [0004] The traditional synthesis methods of 2,5-dichlorophenol include trichlorobenzene hydrolysis method, dichloroaniline diazo hydrolysis method, and trichlorobenzene sulfonation alkali dissolution method. However, these several methods all have the comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/60C07C39/02
Inventor 石权达孟明扬沈德堂储消和徐红彪陈建华陈中兵
Owner SHENYANG RES INST OF CHEM IND
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