16079-88-2Relevant articles and documents
Tail gas treatment process in synthesis process of bromochlorohydantoin
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Paragraph 0019; 0022; 0026; 0028; 0030; 0034; 0036; 0039, (2019/07/29)
The invention relates to a tail gas treatment process in the synthesis process of bromochlorohydantoin. The tail gas treatment process includes the first step of taking 5,5-dimethylhydantoin as a rawmaterial to prepare bromochlorohydantoin in a synthesis kettle; leading synthesis kettle tail gas into a tail gas absorption kettle, and evacuating the tail gas absorption kettle through an environmental protection absorption tower; wherein tail gas absorption liquid is disposed in the tail gas absorption tank and is aqueous solution of 5,5-dimethylhydantoin and sodium hydroxide or mixed liquid of5,5-dimethylhydantoin and dibromohydantoin mother solution of sodium hydroxide; leaching absorption liquid is disposed in the environmental protection absorption tower and is sodium hydroxide aqueoussolution and a mixture of sodium hydroxide and dibromohydantoin mother solution; the second step of transferring the tail gas absorption liquid in the tail gas absorption kettle into the synthesis kettle after the synthesis kettle is empty, transferring the leaching absorption liquid in the environmental protection absorption tower into the tail gas absorption kettle, and adding 5,5-dimethylhydantoin. According to the tail gas treatment process, the tail gas generated by the synthesis process of bromochlorohydantoin undergoes two-stage absorption by the tail gas absorption kettle and the environmental protection absorption tower and meets the requirements of environmental protection discharge.
Method of preparing N-halogenated organic heterocyclic compounds
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, (2008/06/13)
A method of preparing N-halogenated organic heterocyclic compounds by reacting in an aqueous mixture under alkaline conditions (e.g. NaOH) and in the presence of a halogenated organic compound (e.g. methylene chloride), a N-hydrogen organic heterocyclic compound containing at least one NH group (e.g. 5,5-dimethylhydantoin) and a halogen-producing chemical (e.g. Br2).