Studies on Purification of Sugar Liquor with Ion-exchange Resin
Part II. The pH-drops of sugar liquors treated with reverse system
1975 Volume 22 Issue 2 Pages 78-82
Details
1975 Volume 22 Issue 2 Pages 78-82
The pH-drops of sugar liquors treated with reverse system of ion-exchange resin was studied. The results obtained were as follows:
1. The effluents from the ion-exchange resin of reverse system (IRA-900-IRA-75) of sugar liquors containing reducing sugars, such as glucose solution, fine liquor or affined sugar solution, indicated lower pH value. However, in the case of sucrose solution such a tendency was not observed.
2. It became apparent that this pH-drops of the effluents were caused by organic acids, including lactic acid, glycolic acid, etc., which were produced by the interaction of reducing sugars with strong basic anion-exchange resin.
3. It was recognized that the presence of sucrose and/or inorganic salt in the sugar liquors containing reducing sugar caused increase of the amounts of leaked organic acids.
4. The serious problem, that is pH-drop of sugar liquor treated with the reverse system, was improved satisfactorily by the retreatment of the sugar liquor with an anion-exchange resin such as IRA-93 (OH) or IRA-900 (CO3).
