A process for obtaining diacerein with an aloe-emodine content lower thatn 100 ppm, prefereably of 0-5 ppm, is herein disclosed. The process comprises subjecting an an aqueous-organic solution of a diacerein salt with a weak base to extraction with a water immiscible or sparingly water-miscible solvent, such as toluene, aetates of C
2
-C
4
alcohols, halohydrocarbons and the like.
本发明公开了一种获得芦荟-艾莫丁含量低于 100 ppm,最好为 0-5 ppm 的二醋瑞 林的工艺。该工艺包括用不溶于
水或很少溶于
水的溶剂(如
甲苯、C-2-
乙酸乙酯、C-3-
乙酸乙酯)萃取二醋瑞林盐的弱碱有机
水溶液。
2
-C
4
醇、卤代烃等。