NOVELTY - Direct dehydration of water rich stream, comprises: providing process stream to at least one temperature controlled adsorber (comprising at least one adsorption flow passage (16) containing adsorptive material coating and at least one heat transfer flow passage (32)), that is undergoing adsorption; passing process stream through at least one adsorption flow passages, where water is adsorbed by adsorptive material coating; generating heat of adsorption; removing heat of adsorption by passing cooling fluid through the heat transfer flow passage; and producing dehydrated effluent stream (24).    USE - The process is useful for direct dehydration of water rich stream (claimed), e.g. dehydration of fermentation beer for use in producing motor fuel grade ethanol.    ADVANTAGE - The process provides temperature controlled adsorption and is operated at conditions approaching isothermal conditions. The process has benefits over operating an adiabatic adsorbent system comprising: the upper limit on water concentration in the fluid to be treated is eliminated, providing the ability for dehydration of extremely water-rich streams; increased differential loading potential is provided, with substantially lower loadings achieved during regeneration and higher loadings achievable during adsorption steps; lower product dew-point specifications for water in the product stream, and smaller equipment size; reduction of purge gas requirements during the regeneration step and simultaneous increase of the potential for recovering high concentrations of adsorbate (i.e. water) in the regeneration gas; flexibility in selecting the heating and cooling heat transfer media with minimal impact on desired process streams; and extremely rapid thermal swing adsorption with cycle times at or below adiabatic processes is achieved, which results in smaller adsorber systems, saving both capital and energy.    DESCRIPTION OF DRAWING(S) - The figure illustrates the process for dehydration of a water rich stream.    First temperature controlled adsorber (12)    Second temperature controlled adsorber (14)    At least one adsorption flow passages (16)    Dehydrated effluent stream (24)    At least one heat transfer flow passages (32)