A kind of synthetic method of chloroacetyl chloride

Abstract

The invention discloses a kind of chloroacetyl chloride (ClCH 2 The synthesis method of COCl) is specifically to use an activated carbon-supported Lewis acid catalyst to catalyze the α-halogenation reaction of gaseous acetyl chloride and chlorine to generate chloroacetyl chloride, and the reaction is carried out in a contact reactor. The Lewis acid is specifically ferric chloride or aluminum chloride, and its consumption accounts for 1-7% of the total feeding amount of acetyl chloride. The synthesis method of the invention has high catalyst utilization rate, good selectivity, few by-products, product purity ≥ 99.5%, the reaction is carried out at low temperature, low energy consumption, little environmental pollution, and the reaction equipment is simple in structure and easy to operate.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and relates to a synthesis method of chloroacetyl chloride, in particular to a method for synthesizing chloroacetyl chloride by using the by-product acetyl chloride in the production process of water treatment agent hydroxyethylene diphosphonic acid. Background technique [0002] The treatment of by-product acetyl chloride in the preparation process of water treatment agent hydroxyethylene diphosphonic acid has always been one of the key issues hindering the expansion of hydroxyethylene diphosphonic acid products. α-Chlorination to prepare chloroacetyl chloride is one way to solve this problem. Since the process of α-H being replaced in acetyl chloride is a step-by-step substitution reaction process, the main reaction can be maintained at the stage of monochloride acetyl chloride by controlling the appropriate reaction temperature and selecting a suitable catalytic system. [0003] Chloroacetyl chl...

AI Technical Summary

Problems solved by technology

Due to the heterogeneous reaction system in which the reaction raw materials are gaseous and liquid, the reaction kettle cannot fully contact the diketene in the liquid phase due to the non-directional diffusion of chlorine gas, resulting in insufficient reaction and high impurity content in the product.