Continuous production method of bromochlorohydantoin

Abstract

The invention discloses a continuous production method of bromochlorohydantoin, belonging to the technical field of disinfectant production. The continuous production method comprises the following steps: synthesizing 5,5-dimethylhydantoin, removing ammonia from an aqueous 5,5-dimethylhydantoin solution, and preparing bromochlorohydantoin. According to the method, water, ammonia gas, carbon dioxide and acetone cyanohydrin are used as raw materials for a reaction to synthesize 5,5-dimethylhydantoin; introducing inert gas into the aqueous 5,5-dimethylhydantoin solution to remove dissolved ammonia; and adding 5,5-dimethylhydantoin and inorganic base into a reaction kettle, conducting cooling, introducing bromine and chlorine, carrying out a bromination and chlorination reaction, centrifugallyspin-drying a reaction material after the reaction is finished, and conducting drying to obtain powdery bromochlorohydantoin. According to the method, dissolved ammonia in the aqueous 5,5-dimethylhydantoin solution is removed through the inert gas, and then bromochlorohydantoin is synthesized, so production steps are reduced, and production cost and potential safety hazards are reduced; and meanwhile, dimethylhydantoin synthesis to continuous bromochlorohydantoin production is realized by linking all the procedures through a conveying pipeline.

Description

technical field [0001] The invention belongs to the technical field of disinfectant production, in particular to a continuous production method of bromochlorohydantoin. Background technique [0002] Bromochlorohydantoin is a kind of disinfectant with specific performance. The residue 5,5-dimethylhydantoin after disinfection and sterilization of bromochlorohydantoin can be rapidly degraded into ammonia and carbon dioxide under natural conditions, which is harmful to the environment. The impact is small, and it is a water treatment chemical advocated and encouraged by the state. Widely used in industrial water treatment, disinfection and sterilization of flowers and seeds, aquaculture, fruit preservation, etc. [0003] At present, the current production of bromochlorohydantoin is mainly synthesized from 5,5-dimethylhydantoin, inorganic alkali, chlorine gas, and bromine, with high output and good product quality. Therefore, domestic bromochlorohydantoin production enterprises ...