Method for purifying a composition containing at least an...

C - Chemistry – Metallurgy – 07 – D

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C07D 493/04 (2006.01)

Patent

CA 2411741

The invention concerns a method for purifying a composition containing at least a product for internal dehydration of a hydrogenated sugar. The invention is characterised in that it comprises: (a) an optional step whereby said composition is treated, whether after re-dissolving or not, with at least a discoloration means; (b) a subsequent step whereby the composition, optionally treated with discoloration means, is treated with at least ion-exchanging means; (c) a subsequent step whereby the resulting composition is treated with at least discoloration means. Said method is in particular applicable to isohexide compositions, in particular isosorbide or isomannide. The resulting compositions, which exhibit particular characteristics in terms of purity and proportion of some impurities, constitute novel products for use in chemical, pharmaceutical, cosmetology and food industries.

La présente invention concerne un procédé de purification d'une composition contenant au moins un produit de déshydratation interne d'un sucre hydrogéné, caractérisé en ce qu'il comprend: (a) une étape éventuelle au cours de laquelle ladite composition est traitée, après remise en solution ou non, avec au moins un moyen de décoloraton; (b) une étape subséquente au cours de laquelle la composition, éventuellement traitée avec un moyen de décoloration, est traitée avec au moins un moyen d'échange ionique; (c) une étape subséquente au cours de laquelle la composition résultante est traitée avec au moins un moyen de décoloration. Ce procédé est notamment applicable à des compositions d'isohexide(s), et notamment d'isosorbide ou d'isomannide. Les compositions obtenues, lesquelles présentes des caractéristiques particulières en termes de pureté et de taux de certaines impuretés, constituent de nouveaux produits utilisables dans les industries chimiques, pharmaceutiques, cosmétologiques et alimentaires.

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