Method and device for producing dichlorotoluene by tower-type continuous chlorination

A technology of dichlorotoluene and o-chlorotoluene, which is applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., can solve the problems of high energy consumption and material consumption, backward technology, etc., and achieve reasonable technology, high product yield, The effect of high production capacity

Pending Publication Date: 2018-03-23
NANJING ZHONGTENG CHEM
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  • Abstract
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  • Claims
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Problems solved by technology

[0002] Dichlorotoluene is an important fine chemical raw material, which can be widely used in the manufacture of fungicides, insecticides, herbicides, dyes and pigments, medicines and other chemical products. Its status and role have attracted more and more attention. Its synthesis The difficulty of technology and wide range of uses make this compound produce higher added value, but nowadays most of the chlorination industry is mainly based on batch reaction, the technology is backward, and the energy consumption and material consumption are high.

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  • Method and device for producing dichlorotoluene by tower-type continuous chlorination

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Embodiment 1

[0017] A tower-type continuous chlorination device for producing dichlorotoluene, comprising a tower reactor 1 for continuous chlorination reaction, an absorption tower 2 for removing chlorine in tail gas, and a spray tower 3 for removing chlorine in tail gas And for forming the configuration tank 4 of the configuration liquid, the bottom of the tower reactor is provided with a configuration liquid feed pipe 5, and the configuration liquid feed pipe 5 is connected to the configuration tank 4, and on the configuration liquid feed pipe A metering pump is provided; the upper part of the tower reactor is provided with a chlorinated liquid outlet, and the chlorinated liquid outlet is connected with the chlorinated liquid output pipe, and the chlorinated liquid output pipe is connected with the chlorinated liquid The liquid external circulation pipe is connected, the external circulation pipe of the chlorinated liquid is connected with the bottom of the tower reactor, the output pipe...

Embodiment 2

[0020] Put 55kg of o-chlorotoluene and 203 g of ferric chloride (catalyst) into the preparation tank and stir for half an hour to form a configuration liquid, then use a metering pump to send the configuration liquid into the tower reaction tower through the feed pipe, and then open Circulation pump to circulate, open the chlorine gas flow regulating valve to pass chlorine, the chlorine gas flow rate is 0.3m3 / h, when the reaction temperature reaches 20°C, turn on the heat exchanger to circulate cooling water to cool the chlorinated liquid, properly adjust the chlorine gas flow rate and the cooling water of the cooler The opening degree controls the reaction temperature at 25-40°C, and the reaction time is about 11 hours. The total mass of the reaction intermediate liquid is detected to be 62kg, and the composition is shown in Table 1 below:

[0021] Table 1

[0022] Element

[0023] After calculation, the conversion rate of the raw material o-chlorotoluene reaches 32...

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Abstract

The invention discloses a method and a device for producing dichlorotoluene by tower-type continuous chlorination. The method comprises the following steps of: uniformly stirring a raw material namelyo-chlorotoluene and a solid powder catalyst to form a configuration liquid, feeding the configuration liquid into a tower-type reactor from the bottom of the tower-type reactor, continuously introducing chlorine gas into the tower-type reactor from the bottom of the tower-type reactor for chlorination reaction, and cooling the obtained chlorination liquid by an external circulation heat exchanger, and controlling the reaction temperature to be 25-40 DEG C; and when the conversion rate of the raw material namely o-chlorotoluene in the chlorination liquid reaches 45-75% and the selectivity of the 2,6-dichlorotoluene reaches 25% or more, discharging the chlorination liquid continuously, continuously introducing the configuration liquid at the same time, wherein the quantity of the introducedconfiguration liquid is ensured to be slightly smaller than the discharge quantity. The process is reasonable, the yield is high, the productivity is large, the device is simple, and the investment cost is low.

Description

technical field [0001] The invention relates to a method and a device for producing dichlorotoluene by tower-type continuous chlorination. Background technique [0002] Dichlorotoluene is an important fine chemical raw material, which can be widely used in the manufacture of fungicides, insecticides, herbicides, dyes and pigments, medicines and other chemical products. Its status and role have attracted more and more attention. Its synthesis The technical difficulty and wide range of uses make this compound produce higher added value, but most of the current chlorination industry is mainly based on batch reaction, with backward technology and high energy consumption and material consumption. Contents of the invention [0003] The invention provides a method for producing dichlorotoluene by continuous catalytic chlorination with ortho-chlorotoluene as raw material with reasonable technology, high yield and large production capacity. [0004] In order to solve the above pro...

Claims

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Application Information

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IPC IPC(8): C07C17/12C07C25/08
CPCC07C17/12C07C25/08
Inventor 陈秀珍束立军黄敏蔡伟忠孙乾华陆敏山
Owner NANJING ZHONGTENG CHEM
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