A kind of method and system for continuous production of 2,5-dichlorophenol

A dichlorophenol and circulatory system technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of long time consumption and high risk factor, achieve low decomposition rate, less side reactions, and prevent rapid rise high effect

Active Publication Date: 2017-10-13
SHANDONG WEIFANG RAINBOW CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for continuous production of 2,5-dichlorophenol, which aims to solve the problems of long time consumption and high risk factor in the current industrial production method, and realize the safe continuous production of 2,5-dichlorophenol Production

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  • A kind of method and system for continuous production of 2,5-dichlorophenol
  • A kind of method and system for continuous production of 2,5-dichlorophenol

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Embodiment 1

[0057] The present invention adopts a continuous system to realize the continuous production of 2,5-dichlorophenol, and the continuous system is as figure 1 As shown, the diazotization circulation system and the hydrolysis circulation system, the diazotization circulation system includes a diazo strong mixing device, and the upper part of the diazo strong mixing device is connected with an aniline salt storage tank and a nitrite storage tank, so The outlet of the diazo strong mixing device is connected to the diazo liquid storage tank, the diazo liquid storage tank is connected to the first heat exchanger, the first heat exchanger is connected to the diazo strong mixing device, and the first heat exchanger is connected to the diazo strong mixing device. The heater makes the material in the diazo liquid storage tank enter the diazo strong mixing device; the hydrolysis circulation system includes a hydrolysis strong mixing device, and the discharge port of the hydrolysis strong m...

Embodiment 2

[0063] Adopt the continuous system production of embodiment 1 to produce 2,5-dichlorophenol, the continuous production method is as follows:

[0064] (1) Continuously feed the aniline salt and nitrite into the diazo strong mixing device according to the molar ratio of 1:1.0, and at the same time continuously feed the back-mixed liquid according to the molar ratio of aniline salt: back-mixed liquid of 1:10, the diazo strong In the mixing device, the materials are strongly mixed according to the linear speed of 50m / s to carry out the diazotization reaction. The diazo liquid generated by the reaction flows out continuously into the diazo liquid storage tank. The residence time in the mixing device is 0.5s; part of the diazo liquid in the diazo liquid storage tank is cooled to 5°C by the first heat exchanger, and then passed into the diazo strong mixing device continuously as the back-mixed liquid according to the above ratio, so as to Keep the temperature of the system in the dia...

Embodiment 3

[0070] Adopt the continuous system production of embodiment 1 to produce 2,5-dichlorophenol, the continuous production method is as follows:

[0071] (1) The aniline salt and nitrite are continuously fed into the diazo strong mixing device according to the molar ratio of 1:1.3, and at the same time, the aniline salt: back-mixed liquid molar ratio is continuously fed into the back-mixed liquid according to the molar ratio of 1:11, and the diazoic strong In the mixing device, the materials are strongly mixed according to the linear speed of 5m / s to carry out the diazotization reaction. The diazo liquid generated by the reaction flows out continuously into the diazo liquid storage tank. The residence time in the mixing device is 10s; part of the diazo liquid in the diazo liquid storage tank is cooled to 5°C by the first heat exchanger, and then it is continuously passed into the diazo strong mixing device as the back-mixed liquid according to the above ratio, so as to keep The te...

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Abstract

The present invention provides a method and system for continuously producing 2,5-dichlorophenol. The method comprises an aniline salt diazotization process and a diazo solution hydrolysis process. The aniline salt diazotization process comprises the steps of continuously feeding aniline salt and nitrite into a diazo intensive mixing apparatus; performing a diazotization reaction under intensive mixing; feeding a diazo solution generated by the reaction into a diazo solution storing tank; back-mixing a part of the diazo solution in the diazo solution storing tank after cooling and feeding the part of the diazo solution into the diazo intensive mixing apparatus; removing all or a part of heat generated in the diazotization reaction by using the back-mixed cryogenic diazo solution; and directly performing continuous hydrolysis on the other part of the diazo solution. According to the method provided by the present invention, by adopting an intensive mixing process and a back-mixing process, mass and heat transfer during the diazotization reaction and the hydrolysis reaction can be quickly performed; heat can be taken away or given in time; a reaction time is shortened; the side reaction is reduced; the heat utilization rate is improved; the costs are lowered; and a safety factor and the device production capacity are improved.

Description

technical field [0001] The invention relates to a method for continuous production of 2,5-dichlorophenol and a continuous production system, belonging to the technical field of 2,5-dichlorophenol production. Background technique [0002] 2,5-dichlorophenol, English name: 2,5-dichlorophenol, referred to as 2,5-DCP, molecular formula: C 6 h 4 Cl 2 O, molecular weight: 163. 2,5-Dichlorophenol is an intermediate of the herbicide dicamba. Dicamba is a benzoic acid herbicide. It has a systemic conduction effect and has a significant control effect on annual and perennial broad-leaved weeds , has been widely used in agriculture. At present, the dicamba market at home and abroad is vast, and a new dicamba production process is urgently needed to meet the market demand. In this regard, the synthesis method and synthesis process of 2,5-dichlorophenol as an intermediate have also become a research hotspot. The relatively mature 2,5-dichlorophenol process that has been industrialize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C39/30C07C37/045
CPCC07C37/045C07C39/30
Inventor 孙国庆侯永生迟志龙高技峰陈桂元周长涛
Owner SHANDONG WEIFANG RAINBOW CHEM
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