Process of manufacturing crystal sugar from an aqueous sugar juice such as cane juice or sugar beet juice

摘要

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 Ca2+ and/or Mg2+ 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.