DECOLORIZATION OF CANE SYRUP USING WEAK ANIONIC RESIN COMPARED TO STRONG ANIONIC RESIN REGENERATED USING DISODIUM HIDROGEN PHOSPHATE

Triantarti and Aris Toharisman
Indonesian Sugar Research Institute

triantarti@gmail.com


ABSTRACT

Commonly, decolorization of cane sugar syrup is conducted by single anionic resin regenerated using NaCl solution. However, decolorization using the common technique is unable to be used for producing a direct consumption of cane syrup. The reason is the syrup produced will have a salty taste resulted from high concentration of Cl- ions released from anionic resin during decolorization process. The objective of this research project was to determine the ability of weak anionic resin compared to strong anionic resin after regeneration using disodium hydrogen phosphate for decolorization of cane syrup (60%Brix) with an average color of 700 iu. The cane syrup as a feed was produced through purification of raw cane juice by a combination of carbonatation and phosphatation process followed by decolorization using powder activated carbon. The results showed that the amount of Na2HPO4 used for anionic resin regeneration having a significant effect on the degree of decolorization. The optimum condition for anionic resin regeneration was using 2 BV (bed volume) NaOH 5% followed by 8 BV Na2HPO4 1%. Degree of decolorization using strong anionic resin was slightly lower compared to weak anionic resin. They were 42.4% and 47.5% respectively for capacity of 40 BV of cane syrup per cycle.


Key words: cane syrup, decolorization, weak anionic resin, strong anionic resin, disodium hydrogen phosphate,