Synthetic method of 2,5-dichlorophenol

A technology of dichlorophenol and synthesis method, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve the problems of low utilization rate of raw materials, high utilization rate of raw materials and high industrial cost, and achieve high utilization rate of raw materials , The effect of low production cost and low production of three wastes

Inactive Publication Date: 2016-07-27
SICHUAN FOURSTAR BIOTECH RANDD CORP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The present invention aims to solve the existing problems in various processes for synthesizing 2,5-dichlorophenol, especially the synthesis of 2,5-dichlorophenol with 1,2,4-trichlorobenzene as raw material to produce a large amount of industrial The problems of three wastes, high industrial cost and low raw material utilization rate provide a synthesis method of 2,5-dichlorophenol, which has simple process, less generation of three wastes, high raw material utilization rate and low production cost

Method used

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  • Synthetic method of 2,5-dichlorophenol

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Embodiment 1

[0036] A kind of synthetic method of 2,5-dichlorophenol, comprises the following processing steps:

[0037] A, under the condition of catalyst, pass into chlorine gas in pure benzene, obtain 1,2,4-trichlorobenzene and p-dichlorobenzene;

[0038] B, the 1,2,4-trichlorobenzene obtained in step A is formulated into a solution, hydrolyzed and purified to obtain 2,5-dichlorophenol;

[0039] C, the p-dichlorobenzene obtained in step A is reacted with a halogen to generate 2,5-dichlorohalobenzene, and then hydrolyzed to obtain 2,5-dichlorophenol;

[0040] Alternatively, the p-dichlorobenzene obtained in step A is treated with a Lewis acid, and then under the condition of a catalyst, chlorine gas is passed into the p-dichlorobenzene treated by the Lewis acid to obtain 1,2,4-trichlorobenzene, Then formulated into a solution, hydrolyzed and purified to obtain 2,5-dichlorophenol.

Embodiment 2

[0042] On the basis of embodiment 1:

[0043] Preferably, in step A, specifically: using antimony sulfide as a catalyst, chlorine gas is introduced into pure benzene at a reaction temperature of 60°C; wherein, the ratio of chlorine gas to pure benzene is 2.5:1; The mass ratio of antimony sulfide to pure benzene is 0.001:1.

Embodiment 3

[0045] On the basis of embodiment 1:

[0046] Preferably, in step A, specifically: using antimony sulfide as a catalyst, chlorine gas is introduced into pure benzene at a reaction temperature of 65°C; wherein, the ratio of chlorine gas to pure benzene is 3:1; The mass ratio of antimony sulfide to pure benzene is 0.05:1.

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Abstract

The invention relates to a synthetic method of 2,5-dichlorophenol, and belongs to the technical field of dicamba key intermediate synthesis. 1,2,4-trichlorobenzene generated by pure benzene chlorination can be easily separated from 1,4-dichlorobenzene to avoid high production cost and low production efficiency caused by difficulty in separation. Since the 1,2,4-trichlorobenzene and the 1,4-dichlorobenzene can independently obtain the 2,5-dichlorophenol, the use ratio of raw materials is high, the waste of a by-product is avoided, and therefore, the production cost is greatly lowered. In addition, the 1,4-dichlorobenzene can obtain the 2,5-dichlorophenol through two different methods. The synthetic method has the advantages of simple synthetic process, low production cost, high raw material use ratio, less process byproducts and small three-waste output and is more suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for synthesizing a key intermediate for dicamba, more specifically, the invention relates to a method for synthesizing 2,5-dichlorophenol, which belongs to the technical field of dicamba key intermediate synthesis. Background technique [0002] 2,5-Dichlorophenol is an important intermediate of pesticides, medicines and dyes, a key intermediate of benzoic acid-based herbicide-dicamba, a nitrogen fertilizer synergist and a leather antifungal agent. High-purity 2,5-dichlorophenol is a white needle-like crystal with a special odor, and it will gradually turn yellow when placed in the air, and the color will gradually deepen. With the continuous deepening of research on dicamba-resistant biotechnology and dicamba mixed herbicides, its market prospect is promising. [0003] At present, there are three main processes for preparing 2,5-dichlorophenol. Patent US2799714 proposes to use 1,2,4-trichlorobenzene as a raw material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/12C07C25/08C07C25/10C07C37/02C07C39/30C07C25/02
CPCC07C17/12C07C37/02C07C25/08C07C25/10C07C39/30C07C25/02
Inventor 李舟宋剑峰何路涛齐鸿卢刚唐昊肖彦玲张华王蕾
Owner SICHUAN FOURSTAR BIOTECH RANDD CORP
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