| 摘要 |
A process for obtaining diacerein with an aloe-emodine content lower than 10 0 ppm, preferably of 0-5 ppm, is herein disclosed. The process comprises subjecting an an aqueous-organic solution of a diacerein salt with a weak ba se to extraction with a water immiscible or sparingly water-miscible solvent, such as toluene, acetates of C2-C4 alcohols, halohydrocarbons and the like.< /SDOAB>
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