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发明授权
CN101343255B 一种用工业级DM制备医药级DM的方法 失效 - 权利终止

一种用工业级DM制备医药级DM的方法
摘要：
本发明的用工业级DM制备医药级DM的方法，包括以下步骤：(1)溶解；(2)吸附；(3)过滤；(4)结晶；(5)过滤；(6)干燥。本发明的有益效果是，使用四氯乙烯代替甲苯作溶剂，对人体无毒副作用，安全可靠，同时避免了向空中排放有毒物质的缺点，对环境无污染，工艺安全性好，设备要求低，投资小。
摘要（英）：

The invention provides a method for preparing a pharmaceutical grade DM by an industrial grade DM, comprising the following steps of: (1) dissolution; (2) adsorption; (3) filtration; (4) crystallization; (5) filtration; and (6) drying. The method has the advantages of non toxic and side-effect to human body by using perchlorethylene to substitute toluene as a solvent, safety and reliability, avoiding the defect of discharge of poisonous substances to the air, non environmental pollution, good process safety, low equipment requirements and low investment.

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