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PROCESS FOR THE PREPARATION OF 1,2-DICHLOROETHANE FREE CRYSTALS OF ZONISAMIDE AND THE HIGHLY PURE CRYSTALS OF ZONISAMIDE
PROCESS FOR THE PREPARATION OF 1,2-DICHLOROETHANE FREE CRYSTALS OF ZONISAMIDE AND THE HIGHLY PURE CRYSTALS OF ZONISAMIDE
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机译:叠氮化酰胺的1,2-二氯乙烷游离晶体和高纯叠氮化酰胺的制备方法
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摘要
A process for the preparation of crystals of zonisamide containing residual 1,2-dichloroethane of not more than 5 ppm, by adding an aqueous C2-4 alcohol to crystals of zonisamide containing residual 1,2-dichloroethane of more than 5 ppm, removing the 1,2-dichloroethane by azeotropic distillation, followed by collecting the precipitated crystals from the residual mixture.
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