Synthesis process of chloroacetyl chloride

Abstract

The invention belongs to the technical field of fine chemical engineering products, and particularly relates to a synthesis process of chloroacetyl chloride. 10-20 parts of chloroacetic acid are addedinto a reaction bulb, zinc oxide is added at the same time, the mixture is heated to 100-120 DEG C and constantly stirred to melt the chloroacetic acid, the temperature is kept at 100-120 DEG C, 20-40 parts of benzenyltrichloride with the purity being 94-98% are slowly added into the molten chloroacetic acid for about 8-9 h, and after a heat preservation reaction for 1-2 h, through rectificationunder vacuum and separation, 10-20 parts of the chloroacetyl chloride with the purity being 99.3-99.5%, 15-25 parts of benzoyl chloride with the purity being 99.3-99.8% and rectification residual liquid are obtained. A traditional sulphur method is replaced with the process, use of sulphur is not needed, and the process cannot produce sulfur dioxide polluting the environment; the produced chloroacetyl chloride has the high purity, the low dichloride content and no sulfur; a catalyst selected by the process can be applied, the amount of rectification residue is very low, and active components in the rectification residue can be effectively recycled; and by-product hydrochloric acid of the process basically contains no sulfate radicals, and can be directly and externally sold.

Description

technical field [0001] The invention belongs to the technical field of fine chemical products, in particular to a synthesis process of chloroacetyl chloride. Background technique [0002] Chloroacetyl chloride is an important organic chemical intermediate, which is widely used in the fields of pesticides, medicines, dyes, and various auxiliaries. As an acylating agent with excellent performance, the current commercial products are fine Chemicals and chemical reagents. [0003] At present, the sulfur method is widely used in China to synthesize chloroacetyl chloride, but the purity of chloroacetyl chloride synthesized by this method is not high (95%±2%), which leads to low quality of chloroacetyl chloride and limited application fields. Contents of the invention [0004] The present invention is achieved through the following technical solutions: [0005] Add 10~20 parts of chloroacetic acid into the reaction bottle, add zinc oxide catalyst at the same time, heat to 100~1...

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Problems solved by technology

[0003] At present, the sulfur method is widely used in China to synthesize chloroacetyl chloride, but the purity of chloroacetyl chloride synthesized by this method is not high (95%±2%), resulting in low quality of chloroacetyl chloride, and the application field is also limited