Calculation methods for different types of drying operations (vacuum-ductive dryin& drying by pressure drop, self-freezing before sublimation) from multiliquid systems were presented. Kinetic relations of vacuum drying were obtained which allow calculation of drying equipment and choise of optimal aperatiw conditions. The existence of balance invariants'. .removing multicomponent liquid systems -single-valued relations between pressure, moisture wntent, liquid and exhausted vapaur phase composition and ~roduct temperature were found. . . These relations are used to reduce the number ofe~~erimentsneeded to &yze the dryer.