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The factors responsible for shortening sublimation dehydration time for inorganic salts vis-à-vis products of organic nature have been examined. It has been found that substantial increase in temperature of the heat supplying surface may occur due to high-temperature process of thermal degradation of the salts, which follows the sublimation dehydration process; the time for drying granulated material diminishes vis-à-vis a monolithic layer; and the time for drying granulated material on a ribbed tray diminishes vis-à-vis the time for drying on a plane surface. Submitted to analysis are the factors increasing the time of sublimation of the materials and products: substantial thermal resistance develops because of loose adherence of the material to the tray (presence of gaps) and phase resistance appears during drying. Based on the obtained calculated and experimental data, an equation has been proposed for determination of the time of sublimation dehydration of prefrozen crystal hydrates of salts. [ABSTRACT FROM AUTHOR]