| abstract |
(57) [Summary] [Purpose] Batch-type vacuum drying of substances with high water content is economically performed with low power consumption. A dryer main body 3 having a heating jacket 1 and a uniform agitator 2 for mixing, a vacuum pump 4 for sucking evaporated water to make the inside of the dryer main body 3 a negative pressure, and condensing the sucked evaporated water. In a method of performing batch-type vacuum drying by a batch-type vacuum drying device including a vacuum device 6 having a condenser 5 for supplying the processed product, the processed material is continuously or intermittently supplied while maintaining the vacuum inside the dryer main body 3. Then, the amount of heat exchanged in the condenser 5 of the vacuum device 6 is measured to control the supply rate of the processed product, so that the supplied amount of the processed product is controlled so as to optimally maintain the amount of the processed product held in the dryer main body 3. |