Synthesis method of 2, 4-dichlorobenzyl chloride

Abstract

The invention discloses a synthesis method of 2, 4-dichlorobenzyl chloride. The method comprises the following steps: heating 2, 4-dichlorotoluene to 80-100 DEG C, adding catalysts azodiisobutyronitrile and triethanolamine, slowly introducing chlorine under the illumination condition, heating to 120-130 DEG C, reacting for 3-4 hours to generate 2, 4-dichlorobenzyl chloride chlorinated liquid, and carrying out vacuum rectification on the 2, 4-dichlorobenzyl chloride chlorinated liquid to obtain 2, 4-dichlorobenzyl chloride. 2, 4-dichlorotoluene is used as a raw material, azodiisobutyronitrile and triethanolamine are used as the catalysts, through the photochlorination reaction, the conversion rate of converting 2, 4-dichlorotoluene into 2, 4-dichlorobenzyl chloride is increased, the rectification procedure is simplified, meanwhile, generation of a byproduct 2, 4-dichlorobenzylidene dichloride is reduced, the purpose of purifying 2, 4-dichlorobenzyl chloride can be achieved through one-step rectification, procedures are simplified, cost is reduced, and industrial popularization is facilitated.

Description

technical field

[0001] The invention belongs to the technical field of fine chemical organic synthesis, and in particular relates to a synthesis method of 2,4-dichlorobenzyl chloride. Background technique

[0002] With the improvement of chlorotoluene production capacity and production technology, the production capacity of chlorotoluene gradually appears surplus, and the competitive pressure faced by production enterprises is also increasing. On the other hand, it is necessary to speed up the development of downstream products, and the latter will have a more significant benefit to the enterprise. Therefore, increasing technological innovation and technology research and development capabilities, especially increasing the development and application of downstream fine chemical products has become the main direction for the future development of chlorotoluene products. With the continuous expansion of the downstream product market of chlorotoluene, especially the benzotrifl...

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