Method for preparing chlorobenzene, p-dichlorobenzene and o-dichlorobenzene in benzene chlorination

A technology for p-dichlorobenzene and o-dichlorobenzene is applied in the field of preparation of chemical raw materials and can solve the problems of increased amount of by-product polychlorinated benzene, low production capacity, unsuitable for large-scale production and the like

Active Publication Date: 2014-05-28
LIAONING FANGDA ENG DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current production method of dichlorobenzene cannot meet the demand of the market
There are roughly methods for people to obtain dichlorobenzene: 1) It is separated from the heavy component by-products produced by chlorinated benzene, but the quantity is extremely limited; 2) Using ferric chloride as a catalyst, chlorinated benzene and chlorine gas are used as raw materials to further in-depth Dichlorobenzene is obtained by chlorination, and chlorobenzene is obtained after benzene chlorination, water washing, alkali washing, and rectification, which will greatly increase the raw material cost of dichlorobenzene, and the speed of generating dichlorobenzene by chlorination of chloro

Method used

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  • Method for preparing chlorobenzene, p-dichlorobenzene and o-dichlorobenzene in benzene chlorination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The main products are p-dichlorobenzene and o-dichlorobenzene.

[0035] In the outer loop reactor with an aspect ratio of 20 and a tube diameter ratio of 1, the water (anhydrous calcium chloride) dried For benzene with water content ≦100×10-6 weight fraction, the catalyst is ferric trisulfide, 0.08 (W / %) is suspended in benzene, and at the same time, the volume of loop reactor (air lift tube) per cubic meter is 400m3 / h ( Chlorine gas was introduced into the reactor at a speed of 17.9kmole), and the jacket cooling water was opened to adjust the amount of cooling water to control the temperature of the material in the reactor at 45°C. Liquid, the discharge valve continuously adjusts the discharge volume to ensure that the liquid level of the gas-liquid separator is at a certain position. The hydrogen chloride produced by the reaction is separated into gas and liquid, and enters the graphite condenser to separate the entrained benzene and chloride solution. The benzene a...

Embodiment 2

[0040] The main products are p-dichlorobenzene and o-dichlorobenzene, and the co-production of chlorinated benzene has a large proportion.

[0041] In the outer loop reactor with an aspect ratio of 20 and a tube diameter ratio of 1, the water is passed through (anhydrous calcium chloride) drying For benzene with water content ≦100×10-6 weight fraction, the catalyst is ferric trisulfide, 0.07 (W / %) is suspended in benzene, and at the same time, the volume of the loop reactor (air lift tube) per cubic meter is 609m3 / h ( Chlorine gas is introduced into the reactor at a speed of 27.20 kmole), and the jacket cooling water is opened to adjust the amount of cooling water to control the temperature of the material in the reactor at 50°C. Liquid, the discharge valve continuously adjusts the discharge volume to ensure that the liquid level of the gas-liquid separator is at a certain position. The hydrogen chloride produced by the reaction is separated into gas and liquid, and enters th...

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Abstract

The invention discloses a method for preparing chlorobenzene, p-dichlorobenzene and o-dichlorobenzene in benzene chlorination, and relates to a preparation method of chemical raw materials. The method comprises the following steps: continuously introducing dry benzene and chlorine with a high activity and high p-dichlorobenzene selectivity catalyst into an outer circulation reactor, wherein the benzene and chlorine need sufficient retaining time, reacting at a set temperature to prepare p-dichlorobenzene, obtain o-dichlorobenzene at the same time and co-produce chlorobenzene, preparing dichlorobenzene by using the outer circulation reactor and taking the benzene and the chlorine as raw materials and metal sulfide as a catalyst, at the same time co-producing chlorobenzene, forming circulation of the materials through the introduced nitrogen and generated hydrogen chloride as power so as to obtain good stirring for prompting mixing, diffusion, heat conduction and mass transfer of the reactants. The method is rapid in reaction speed, high in capacity, large in ratio of p-dichlorobenzene and o-dichlorobenzene, free of polychlorobenzene byproduct, and high in flexibility and operation flexibility as the ratio of the chlorobenzene to the dichlorobenzene in a product can be adjusted according to demands.

Description

technical field [0001] The invention relates to a method for preparing chemical raw materials, in particular to a method for simultaneously preparing chlorobenzene, p-dichlorobenzene and o-dichlorobenzene through chlorination of benzene. Background technique [0002] P-dichlorobenzene is an important raw material for organic chemical synthesis. It is widely used as a pesticide intermediate, as a fumigant insecticide, fabric mothproof agent, mildewproof agent, and air deodorizer. Most of it is used to make sanitary balls. For example, 32% of p-dichlorobenzene is used as deodorant in the United States. Western Europe accounted for 50%. In Japan, p-dichlorobenzene used for deodorant and anti-moth agents accounts for 70% of its total production capacity; [0003] An important use of p-dichlorobenzene is as an intermediate of high-performance engineering plastic polyphenylene sulfide. Polyphenylene sulfide has excellent properties such as high temperature resistance, radiat...

Claims

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Application Information

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IPC IPC(8): C07C25/06C07C25/08C07C17/12
Inventor 薛之化陈淑艳文花实张辉张军刘志威陈波杨文华李志英
Owner LIAONING FANGDA ENG DESIGN CO LTD
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