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AssigneeSociete Nouvelle de Recherches et D'Applications Industrielles D'Echangeurs D'ions Applexion
InventorsRobert J. Kwok, Xavier Lancrenon, Marc-Andre Theoleyre
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This invention relates to a process for the manufacture of crystal sugar from an aqueous sugar juice containing sugars and organic and mineral impurities, including Ca.sup.2+ and/or Mg.sup.2+ ions, such as a sugar cane or sugar beet juice, comprising the following operations: (a) concentration of said sugar juice to give a syrup, and (b) crystallization of said syrup to give a crystal sugar and a molasses, characterized in that it also comprises an operation: (c) of tangential microfiltration, tangential ultrafiltration or tangential nanofiltration, this operation being effected before operation (a). It also relates to a process for the production of crystal white sugar from a sugar juice of the sugar cane juice type, comprising the above-mentioned process for the production of crystal sugar, completed by re-melt, decolorization and crystallization operations.
A process for the manufacture of crystallized sugar from an aqueous sugar juice containing sugars, and organic impurities including colloids, and mineral impurities comprising a first step of processing said aqueous sugar juice using a filtration method selected from a group consisting of tangential microfiltration, tangential ultrafiltration, or tangential nanofiltration, thereby providing a filtrate, a second step of softening said filtrate to selectively remove calcium and magnesium ions, a third step of concentrating said filtrate to provide a syrup and a fourth step of crystallizing said syrup to provide a crystal sugar and molasses, said first step removing a substantial part of said colloids to prevent said colloids from impairing said second, third or fourth steps.
Dependencies are inferred from the claim text.