NOVELTY - The device comprises a first heat exchanger (W1) for cooling and reducing a water content in the purified gas of two adsorbers, where one of the adsorbers for drying the purified gas and an other adsorber for the regeneration of the loaded adsorbent are switchable. The adsorbers are connected with a conduit for supplying a cooled biogas and a conduit for discharging the dried biogas in which the biogas discharging the conduit of an isolatable branch conduit (6) for separating a partial stream at the dried biogas is bounded that is connected with the two heat exchangers.    USE - The device is useful for adsorptive drying of purified biogas with a methane content of 90 vol.% and regeneration of a loaded adsorbent.    ADVANTAGE - The device is capable of economically drying the purified biogas with less effort in an efficient manner.    DETAILED DESCRIPTION - The device comprises a first heat exchanger (W1) for cooling and reducing water content in a purified gas of two adsorbers, where one of the adsorbers for drying the purified gas and an other adsorber for the regeneration of the loaded adsorbent are switchable. The adsorbers are connected with a conduit for supplying a cooled biogas and a conduit for discharging the dried biogas in which the biogas discharging the conduit of an isolatable branch conduit (6) for separating a partial stream at the dried biogas is bounded, where the biogas is connected with the two heat exchangers. One of the heat exchangers is determined for heating the dried biogas and an other heat exchanger for cooling the dried biogas. The biogas is heated or cooled via an other conduit of the adsorbers to be regenerated. The adsorbent consists of separate layers based on a silica gel and molecular sieve. The silica gel layer: is arranged in a flow direction of the biogas; and consists of a first layer (S1) and a second layer (S2), a lower macroporous layer and an upper mesoporous layer in a ratio from lower to upper layer of 1:1-1:4. The volume ratio of the first silica gel layer to the second molecular sieve layer is 12:1-8:1. The adsorber of a gas-permeable bottom is arranged between the first and second layers. The heat exchangers switched into two series are arranged for cooling and reducing the water content in the supplied biogas. A compressor is introduced into the conduit for removing the dried biogas. The adsorption is performed without pressure or under elevated pressure. The temperature of the dried biogas used: for the regeneration of the adsorbent is 150 degrees C; and for cooling the adsorbent is 5-15 degrees C. The temperature of the cooled biogas before the supply of the adsorber is 5-15 degrees C. The adsorbers: are equipped with a heating device; and are connected to a biogas circulation conduit, which is incorporated into the conduit for supplying the purified biogas.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a device for adsorptive drying of purified biogas (Drawing includes non-English language text).    Branch line (6)    First layer (S1)    Second layer (S2)    First heat exchanger (W1)    Second heat exchanger. (W2)