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Moisture Studies in Dry Products of Milk. I. Kinetics of the Dehydration of Alpha Lactose Hydrate in Toluene

American Dry Milk Institute, Inc., Chicago, Illinois

ABSTRACT

The dehydration of lactose monohydrate in boiling toluene is found to be a first order reaction, the rate constant of which varies with particle size in accordance with the equation kd = 0.565, where "k" is the rate constant in min^-1 and "d" is the average diameter of the particle in microns. The effect of the magnitude of the rate constant on the length of distillation period necessary for the quantitative determination of moisture for dry milk products by the toluol distillation method is discussed. The rate of distillation has some influence on the velocity of dehydration of lactose monohydrate, but above a distillation rate of 6 ml. per minute any further increase in the distillation rate has no effect on the rate of dehydration.