PROCESS FOR MANUFACTURING DIANHYDROHEXITOL CRYSTALS WITH A STEP OF EVAPORATIVE CRYSTALLIZATION OF THE FIRST CRYSTALLIZATION MOTHER LIQUORS

The present invention relates to a process for manufacturing crystals of 1,4:3,6-dianhydrohexitols, by manufacturing a solution of an internal dehydration product of at least one hexitol, distilling said solution, crystallizing, and characterized in that the crystallization mother liquors undergo a...

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Bibliographic Details
Main Authors WYART, HERVE, LESUR, THOMAS, IBERT, MATHIAS
Format Patent
LanguageEnglish
French
Published 16.04.2024
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Summary:The present invention relates to a process for manufacturing crystals of 1,4:3,6-dianhydrohexitols, by manufacturing a solution of an internal dehydration product of at least one hexitol, distilling said solution, crystallizing, and characterized in that the crystallization mother liquors undergo a step of evaporative crystallization. Unlike the prior art processes that seek to recycle the crystallization mother liquors, evaporative crystallization economically and efficiently replaces the succession of steps consisting of at least one concentration, then at least one step of purification by distillation, chromatography, or crystallization. La présente invention concerne un procédé de fabrication de cristaux de 1,4:3,6- dianhydrohexitols, par fabrication d'une solution d'un produit de déshydratation interne d'au moins un hexitol, distillation de ladite solution, cristallisation, et caractérisé en ce que les eaux-mères de cristallisation subissent une étape d'évapocristallisation. A la différence des procédés de l'art antérieur qui cherchent à valoriser les eaux-mères de cristallisation, l'évapocristallisation se substitue de manière économique et performante à la succession d'étapes consistant en au moins une concentration, puis au moins une étape de purification par distillation, chromatographie, ou cristallisation.
Bibliography:Application Number: CA20173021266