Process for crystallizing d-alpha-tocopheryl succinate

Details Process for crystallizing d-alpha-tocopheryl succinate Process for crystallizing d-alpha-tocopheryl succinate

C - Chemistry, Metallurgy

07

D

C07D 311/72 (2006.01)

Patent

CA 2273099

Disclosed is a process whereby d-alpha-tocopheryl succinate (TS) can be crystallized in a short period of time by subjecting a fluid TS at particular temperature to a particular rate of shear for a particular time in order to accomplish crystallization. Then, while maintaining the crystallized TS at a temperature less than its melting point, we withdraw the crystallized TS from the region of shear flow. In a preferred embodiment of our process, crystallization is enhanced by use of a particular elongational rate for a particular time.

La présente invention concerne un procédé permettant de cristalliser en peu de temps le D-.alpha.-tocophéryl succinate (TS) en soumettant le TS fluide à cisaillement d'un taux spécifique, dans des conditions de température spécifiques pendant une durée spécifique, jusqu'à obtention de la cristallisation. Ensuite, tout en maintenant le TS cristallisé à une température inférieure à son point de fusion, le procédé consiste à soutirer le TS cristallisé dans la région du flux de cisaillement. Selon une réalisation préférée, on augmente la cristallisation en appliquant un taux d'allongement particulier pendant une durée spécifique.

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