Drying is a key stage in numerous technological processes in the preparation of adsorbents and catalysts. A very efficient method preserving the quality of dried material is adsorption-contact drying (ACD). To calculate the rate of the mass transfer in the process of the ACD, it is necessary to have the data on the ratio between the gas-phase and liquid-phase transfer of moisture. A method to determine the rates for gas-phase and liquid-phase transfer of moisture in the process of mass transfer in porous materials is suggested. The data obtained agree well with the existing theoretical concepts about the liquid-phase transfer of moisture under the mechanical contact of two porous bodies.