Research Progress in Purification Technology of Potassium Persulfate
The ammonia nitrogen content in the reagent potassium persulfate is the key factor for the determination of total nitrogen in water.The imported reagent that meets the requirements is sold at more than one thousand RMB per kilogram.This paper summarizes the development status of potassium persulfate purification technology,providing reference for the research and development of import substitution in this purification field on potassium persulfate.At present,the purification of potassium persulfate can be generally divided into physical purification method,chemical purification method and electrolysis method.The physical purification method includes dissolution,cooling,crystallization,drying and other processes.The chemical purification method is to remove the ammonium ion from potassium persulfate,which is embedded in the physical purification process and achieves high purity potassium persulfate.The electrolysis method is a kind of potassium persulfate with a performance of 96％purity,but there is a great distance from high purity potassium persulfate.Therefore,the chemical purification method is a more innovative and promising method for the purification of potassium persulfate.
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