Developing Principles for an Electrochemical Low-Waste Production of Chloramines T, B, and KhB

Two approaches to organizing a low-waste production of chloramines T, B, and KhB are suggested and experimentally substantiated. One is based on the electrolysis of proper arylsulfamides in a saturated aqueous NaCl solution, involves a multiple recycling of spent solutions, and may be realized in a diaphragmless electrolyzing cell at high current loads (6 kA m-2). The yield of the target products is no less than 90% at a purity of 98%. The other technique leans upon the traditional technology commonly adopted in an industrial production of the above chloramines and includes, in addition to the earlier existing steps, a step we proposed for purifying waste water. The proposed step involves an additional chlorination of residual chloramine and arylsulfamide present in the waste water to dichloramide insoluble in aqueous media. The dichloramide is then quantitatively converted into the target chloramine. The aqueous NaCl solution thus purified is subsequently used for an electrochemical production of chlorine and alkali. This approach makes it possible to recycle spent solutions and increase the yield of target products by 20–30% as compared with the existing technology.