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Method of producing chlorobenzyl by photochlorination

A technology of photochlorination and benzyl chloride, which is applied in the field of photochlorination induced by ultraviolet photocatalysis to produce benzyl chloride, can solve the problems of high power consumption of light source, low calorific value of light source, low utilization rate of light energy, etc., and achieve the goal of increasing light energy The effect of high utilization rate, low calorific value and low comprehensive energy consumption

Active Publication Date: 2007-04-18
ZHEJIANG WEIHUA NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The invention aims to overcome the defects of large power consumption of the light source used in the traditional photochlorination process, low utilization rate of light energy, and short life of the light source, and provide a low power consumption, low calorific value of the light source, low investment, and full utilization of by-products. The method for producing benzyl chloride by photochlorination

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  • Method of producing chlorobenzyl by photochlorination

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Effect test

Embodiment 1

[0024] The light source used to initiate the photochlorination reaction was assembled from 355 light-emitting diodes (LEDs). The photochlorination device is mainly composed of the following equipment: chlorination tower, tail gas condenser, tail gas absorption tower, absorption liquid circulation tank, circulation pump, by-product hydrochloric acid and sodium hypochlorite storage tank, etc.

[0025] Put 6.5 tons of toluene into the chlorination tower, open the steam valve of the chlorination tower jacket, make the material in the tower warm up to 90°C, turn on the switch of the light-emitting diode (LED) light source, and open the chlorine gas pipeline valve under light conditions, and the chlorine gas passes through The flow meter contacts the material from the bottom of the chlorination tower through the distributor to produce a side chain chlorination reaction. Adjust the jacket steam or cooling water valve of the chlorination tower to maintain the reaction temperature at 90...

Embodiment 2

[0028] Photochlorination device is the same as embodiment 1. Put 7.5 tons of p-chlorotoluene into the chlorination tower, open the steam valve of the jacket of the chlorination tower, make the material in the tower warm up to 90°C, turn on the switch of the light-emitting diode (LED) light source, and open the chlorine pipeline valve under light conditions. Chlorine gas passes through the flow meter from the bottom of the chlorination tower to contact with the material through the distributor to produce a side chain chlorination reaction. Adjust the jacket steam or cooling water valve of the chlorination tower to maintain the reaction temperature at 90 ° C ~ 150 ° C, and the reaction starts in pairs Chlorine-chlorobenzyl, continue logical chlorine to obtain p-chlorodichlorobenzyl, finally generate p-chlorotrichlorobenzyl (p-chlorobenzotrichlorotoluene), constantly detect the composition of chlorinated material, when the p-chlorodichlorobenzyl content in the chlorinated material...

Embodiment 3

[0031] Photochlorination device is the same as embodiment 1. Put 6.0 tons of m-xylene into the chlorination tower, open the steam valve of the jacket of the chlorination tower, make the material in the tower warm up to 95°C, turn on the switch of the light-emitting diode (LED) light source, and open the chlorine pipeline valve under light conditions, Chlorine gas passes through the flow meter from the bottom of the chlorination tower to contact with the material through the distributor to produce a side chain chlorination reaction. Adjust the jacket steam or cooling water valve of the chlorination tower to maintain the reaction temperature at 95°C to 150°C. Dichlorobenzyl, continue logical chlorine to obtain m-dichlorobenzyl, finally generate m-ditrichlorobenzyl (m-ditrichlorotoluene), constantly detect the composition of chlorinated material, when the m-dichlorobenzyl content in the chlorinated material When it is less than 0.8%, stop the chlorine flow, and use nitrogen to re...

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Abstract

The present invention relates to a method for producing chlorobenzyl by utilizing photochlorination process. Said method includes the following steps: using LED as light source, making chlorine gas be contacted with the material from the bottom portion of the chlorination equipment by means of distributor, under the reaction temperature of 90 deg.C-150 deg.C making chlorine gas and aromatic compound produce side-chain chlorination reaction, firstly forming monochlorobenzyl, continuously introducing chlorine gas to obtain dichlorobenzyl, finally forming trichlorobenzyl, namely the invented product.

Description

technical field [0001] The present invention relates to a kind of chemical process technology using photochemical reaction, in particular to a method for producing benzyl chloride by photochlorination process, especially a kind of photochlorination induced by ultraviolet photocatalysis in the side chain chlorination process of aromatic hydrocarbons A method for producing benzyl chloride by reaction. Background technique [0002] The chlorination of aromatic hydrocarbon side chains in the presence of light, heat or initiators is a type of free radical reaction, which can be technically divided into two types, one is catalytic chlorination with peroxide as the initiator, and the commonly used peroxide Catalysts include: dibenzoyl peroxide, azobisisobutyronitrile, etc.; the other is to use ultraviolet light to catalyze and initiate chlorination reactions. Chlorination reactors are mainly glass-lined tank reactors. The side chain chlorination of aromatic hydrocarbons is mainly...

Claims

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Application Information

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IPC IPC(8): C07C17/14C07C22/04C07C22/06
Inventor 李惠跃卜鲁周
Owner ZHEJIANG WEIHUA NEW MATERIAL CO LTD
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