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Tower-type continuous chlorination technical process for producing p-chlorophenol

A technology of p-chlorophenol and process, applied in the field of process of producing p-chlorophenol by tower continuous chlorination method, can solve the problem of low para-selectivity by-products, etc. Selectivity, the effect of reducing the formation of dichloro-substituted and trichloro-substituted compounds

Active Publication Date: 2018-12-28
浙江新恒贸实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is simple and easy to operate, but its disadvantage is that the para-selectivity is not high and a large number of by-products are generated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of technical process of tower type continuous chlorination method producing p-chlorophenol, comprises the steps:

[0018] (1) Chlorination process: heat 1,000 parts of phenol to 41°C, and then add it to the top of the six-stage continuous chlorination tower reactor; at the same time, pass 1,000 parts of chlorine gas into the reactor from the tower kettle, and distribute the chlorine gas The reactor is passed into the reactor from bottom to top, and the rising chlorine gas and the falling liquid phenol undergo a continuous chlorination reaction at a temperature of 80~90°C. After 25 hours of reaction, a chlorinated phenol mixture was obtained, which was introduced into a receiver.

[0019] Phenol and chlorine are reacted in a countercurrent manner, which is beneficial to increase the conversion rate of phenol and reduce the generation of dichloro-substituted and trichloro-substituted compounds. The reaction temperature of 80~90℃ not only overcomes the shortcomings...

Embodiment 2

[0022] A kind of technical process of tower type continuous chlorination method producing p-chlorophenol, comprises the steps:

[0023] (1) Chlorination process: heat 1,000 parts of phenol to 43°C, and then add it to the top of the six-stage continuous chlorination tower reactor; at the same time, pass 1,100 parts of chlorine gas into the reactor from the tower kettle, and distribute through the chlorine gas The reactor is passed into the reactor from bottom to top, and the rising chlorine gas and the falling liquid phenol undergo a continuous chlorination reaction at a temperature of 80~90°C. After 28 hours of reaction, a chlorinated phenol mixture was obtained, which was introduced into a receiver.

[0024] (2) Rectification process: Transfer the chlorinated phenol from the receiver to the rectification tower for vacuum distillation to obtain the fractions of o-chlorophenol at 174~176°C, 2,4-dichlorophenol at 208~210°C, 216~218°C p-chlorophenol. By calculation, the convers...

Embodiment 3

[0026] A kind of technical process of tower type continuous chlorination method producing p-chlorophenol, comprises the steps:

[0027] (1) Chlorination process: heat 1,000 parts of phenol to 45°C, and then add it to the top of the six-stage continuous chlorination tower reactor; at the same time, pass 1,200 parts of chlorine gas into the reactor from the tower kettle, and distribute through the chlorine gas The reactor is passed into the reactor from bottom to top, and the rising chlorine gas and the falling liquid phenol undergo a continuous chlorination reaction at a temperature of 80~90°C. After 30 hours of reaction, a chlorinated phenol mixture was obtained, which was introduced into a receiver.

[0028] (2) Rectification process: Transfer the chlorinated phenol from the receiver to the rectification tower for vacuum distillation to obtain the fractions of o-chlorophenol at 174~176°C, 2,4-dichlorophenol at 208~210°C, 216~218°C p-chlorophenol. By calculation, the convers...

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PUM

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Abstract

The invention relates to the field of special environment-friendly coatings, in particular to a tower-type continuous chlorination technical process for producing p-chlorophenol. The process comprisesthe following steps: (1) chlorination: phenol and chlorine in a mole ratio being 1:1-1:1.2 are fed backwards continuously, reaction temperature is 60-100 DEG C, multi-stage continuous chlorination reaction is performed by a tower reactor under normal pressure, and a chlorophenol mixture is obtained and transferred to a chlorophenol receiver; (2) distillation: chlorophenol is transferred to a distillation tower from the receiver for reduced pressure distillation, and fraction o-chlorophenol at 174-176 DEG C, 2,4-dichlorophenol at 208-210 DEG C and p-chlorophenol at 216-218 DEG C are obtained respectively. Reaction selectivity can be improved effectively, generation of byproducts is reduced, and conversion rate of p-chlorophenol is increased effectively.

Description

technical field [0001] The invention relates to the field of special environmental protection coatings, in particular to a process for producing p-chlorophenol by a tower-type continuous chlorination method. Background technique [0002] P-Chlorophenol is widely used in medicine, pesticide, dyestuff and other industries, and is an important organic chemical intermediate. Because the dye intermediate 1,4-dihydroxyanthraquinone has a large demand for the raw material p-chlorophenol, the research on the domestic production of p-chlorophenol and process optimization has become a hot spot. [0003] At present, there are three preparation methods for p-chlorophenol, sulfuryl chloride method, copper chloride method and chlorine gas method. The sulfuryl chloride method uses sulfuryl chloride as the chlorination agent, and reacts to generate p-chlorophenol in the presence of a catalyst. The catalysts used mainly include iron trichloride, aluminum trichloride, etc., and the selectivi...

Claims

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Application Information

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IPC IPC(8): C07C39/28C07C37/62C07C37/74
CPCC07C37/62C07C37/74C07C39/28
Inventor 韩伟国张林飞靳牛强
Owner 浙江新恒贸实业有限公司
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