Method for producing tagatose crystals

C - Chemistry – Metallurgy – 07 – H

Patent

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C07H 3/02 (2006.01) C13B 30/06 (2011.01) C13B 30/12 (2011.01) C07H 1/06 (2006.01) C13K 13/00 (2006.01)

Patent

CA 2418966

A process for producing crystalline tagatose from an aqueous system containing no organic solvents. The process comprises adding seed tagatose crystals to a tagatose solution which has a solid concentration of 60 to 98 wt.% and in which the purity of the tagatose is 70% or higher based on the solid matter and stirring and cooling the resultant mixture while keeping the degree of supersaturation with tagatose at 1.25 or lower to crystallize the tagatose. The tagatose solution preferably contains no organic solvents. It is desirable that part of the massecuite resulting from the crystallization be added to the mother liquor to semicontinuously or continuously produce crystalline tagatose. The crystalline tagatose yielded from the massecuite is preferably taken out by centrifugal separation or filtration and dried.

L'invention concerne un procédé de production de tagatose cristallin à partir d'un système aqueux ne contenant pas de solvants organiques. Ce procédé consiste à ajouter des cristaux germes de tagatose à une solution de tagatose dont la teneur en solide est comprise entre 60 et 98 % en poids, et dans laquelle la pureté du tagatose est de l'ordre de 70 % ou davantage, calculés d'après la matière solide, puis à mélanger et refroidir le mélange résultant tout en maintenant le degré de supersaturation au moyen de tagatose à 1,25 ou moins, de manière à faire cristalliser le tagatose. De préférence, la solution de tagatose ne contient pas de solvants organiques. Il est souhaitable qu'une partie de la masse cuite résultant de la cristallisation soit ajoutée à la solution mère, aux fins de production de tagatose cristallin, en continu ou en semi-continu. De préférence, on enlève le tagatose cristallin produit à partir de la masse cuite, par séparation centrifuge ou filtration, et on le sèche.

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