Process for decolourization and decalcification of sugar...

Details Process for decolourization and decalcification of sugar... Process for decolourization and decalcification of sugar...

C - Chemistry, Metallurgy

13

B

260/234.2

C13B 20/14 (2011.01)

Patent

CA 2016112

TITLE: Process for decolourization and decalcification of sugar solutions. ABSTRACT: This invention refers to a process for decolourization of sugar solutions with simultaneous removal of calcium ions from the solution using an ion exchange resin. This process may be applied to liquors of cane sugar refineries or juices of beet sugar factories, or other sugar solutions. In this process, the sugar solutions containing anionic colourants and soluble calcium salts, are passed through a strong base anionic resin under carbonate form. During decolourization the carbonate ions bound to the fixed ions of the resin are exchanged by the anionic colourants and they precipitate the soluble calcium in solution . The sugar solution treated by the resin is then filtrated. The regeneration of the strong base anionic resin, used in this process, is a three step procedure. In the first step the resin is submitted either to a carbonic dioxide bubbling or to an acid treatment in order to remove the calcium carbonate from the resin; the second step employs a sodium chloride solution and the thirth one a sodium carbonate solution. By this process sugar colourants and calcium ions are removed from sugar solutions in a single operation using only an anionic ion exchange resin. A weak base anionic resin can be used, in a separate column, before the strong base resin, as a protection for this resin.

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