Improved sucralose production method

C - Chemistry – Metallurgy – 07 – H

Patent

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C07H 5/02 (2006.01)

Patent

CA 2675526

There is provided a method for the production of sucralose from a feed stream resulting from the chlorination of a sucrose-6-acylate in a reaction vehicle, said feed stream comprising a sucralose-6-acylate, the reaction vehicle, and by-products including high molecular weight coloured material, said method comprising: deacylation of the sucralose-6-acylate by treatment with a base to afford sucralose, and, before or after said deacylation, removal of the reaction vehicle and isolation of the sucralose characterised in that immediately before the removal of the reaction vehicle, the reaction stream is subjected to a precipitation step comprising treatment with a metal or ammonium hydroxide and carbon dioxide to form a precipitate of the corresponding metal or ammonium carbonate in which at least a portion of said high molecular weight coloured material is trapped, followed by separation of said precipitate.

L'invention concerne un procédé de production de sucralose à partir d'un courant d'alimentation résultant de la chloration d'un sucrose-6-acylate dans un véhicule de réaction. Ledit courant d'alimentation comporte un sucralose-6-acylate, le véhicule de réaction, et des sous-produits incluant une matière colorée de masse moléculaire élevée. Ledit procédé comporte la désacylation du sucralose-6-acylate par traitement basique afin d'obtenir du sucralose et, avant ou après ladite désacylation, le retrait du véhicule de réaction et l'isolement du sucralose. Ledit procédé est caractérisé en ce que, immédiatement avant le retrait du véhicule de réaction, le courant de réaction est soumis à une étape de précipitation comprenant le traitement par hydroxyde de métal ou d'ammonium et par dioxyde de carbone pour former un précipité du carbonate de métal ou d'ammonium correspondant, dans lequel au moins une partie de ladite matière colorée de masse moléculaire élevée est piégée. Apres quoi le courant est séparé dudit précipité.

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