C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 69/00 (2006.01) C07C 67/48 (2006.01) C07C 67/58 (2006.01) C07C 67/60 (2006.01)
Patent
CA 2507582
A process for obtaining diacerein with an aloe-emodine content lower than 100 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 base to extraction with a water immiscible or sparingly water-miscible solvent, such as toluene, acetates of C2-C4 alcohols, halohydrocarbons and the like.
L'invention concerne un procédé permettant d'obtenir de la diacéréine présentant une teneur en aloe-émodine inférieure à 100 ppm, comprise de préférence entre 0 et 5 ppm. Ce procédé consiste à soumettre une solution aqueuse organique d'un sel de diacéréine comprenant une base faible à une extraction au moyen d'un solvant immiscicle ou faiblement miscible avec l'eau, tel que le toluène, les acétates d'alcools en C¿2?-C¿4?, les hydrocarbures halogénés et analogues.
Kirby Eades Gale Baker
Synteco S.p.a.
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