Abstract: The aim of this paper is to increase the dehydrating ratio of citric-nitrate-EG sol-gel with azeotropic distillation and vacuum distillation, and further more, to boost the activity of powders. The experiment results indicated that dehydrating in high temperature will lead to hard-agglomeration. Azeotropic distillation, combining with vacuum distillationcan, improved dehydrating ratio effectively. The less the organic solvent dissolves in water, the higher will the dehydrating ratio be. The dehydrating rati...