Effect of the Addition of Some Carbohydrates on the Decomposition Rate of Sodium Aluminate Solutions with Seeding

Abstract

Abstract In order to study the influence of the presence of the organic matter in a sodium aluminate solution the decomposition rate was investigated by the addition of some carbohydrates as first step of study. Three kinds of carbohydrate, i. e. glucose, sugar and starch (white potato) were chosen and added to a sodium aluminate solution in verious amounts. These solutions were decomposed with seeding of hydrargillite, and these decomposition rates were compared in each case. Consequently it had been observed that the addition of glucose or sugar acts to retard the decomposition, and that the increase of an added amount of starch promotes the decomposition. But the retarding action of glucose is larger than that of sugar. On the other hand, the relation between the added amount of seed and the addition of carbohydrate was investigated. It had been seen that the presence of seed is stronger than that of glucose or sugar in the action of decomposition, and that this relation is different upon the presence of starch. Further the viscosity of sodium aluminate solution mixed with carbohydrate was measured. It has been observed from this measurement that the viscosity of sodium aluminate solution is almost unchanged with the addition of glucose or sugar, and that its viscosity is improved with the addition of starch. Then these results have been compared with the decomposition rate. From this result, it is concluded that the viscosity of solution does not always act on the decomposition as the factor of first order. Hence the action mechanism of these carbohydrates on the decomposition are discussed, and it is clearly concluded that there is a very large difference among the actions of each carbohydrate on the decomposition. In these results one must obtain some informations upon the action mechanism on the decomposition of sodium aluminate solution in the presence of organic matter.