NOVELTY - Purification of raw gas, preferably biogas, for the production of methane, comprises separating components e.g. carbon dioxide, sulfur compounds and ammonia, contained in the raw or biogas, in a multi-stage purification process. The purification process is carried out in at least three successive purification stages. In the first purification step: methane gas with a methane content of at least 60% is removed. In the second purification step, methane dissolved in the wash water is almost completely removed. In the third treatment step, carbon dioxide is removed.    USE - The method is useful for the purification of raw gas, preferably biogas, for the production of methane.    ADVANTAGE - The method is carried out with less energy consumption and increases the methane content of at least 10%.    DETAILED DESCRIPTION - Purification of raw gas, preferably biogas, for the production of methane, comprises separating components e.g. carbon dioxide, sulfur compounds, ammonia and other water-soluble substances, contained in the raw or biogas, in a multi-stage purification process. The purification process is carried out in at least three successive purification stages and under the application of additive free fresh water. In the first purification step: the raw- or biogas to be purified led away from the device is conducted under normal pressure or at a excessive pressure of up to 6 bar, to a wash column having a packed bed countercurrent to the supplied fresh water and in the fresh water, carbon dioxide, hydrogen sulfide, ammonia and other water-soluble organic substances contained in the raw or biogas are present, and at the head of the wash column methane gas with a methane content of at least 60% is removed. In the second purification step, methane dissolved in the wash water is almost completely (at least 90% removed) separated from the contaminated wash water led away from the washing stage, in a first stripping column having packed bed or packing under the supply of stripping air and oxygen, or carbon dioxide, either alone or in combination, in an amount of 0.1-20%, based on the amount of supplied gas under normal pressure, in the countercurrent principle, at above 80 degrees C, thus an oxygen containing stripping gas is produced in fuel gas quality. In the third treatment step, carbon dioxide dissolved in the wash water at least up to a residual content of less than 300 mg/l is separated from the contaminated wash water led away from the first stripping column (K2), in a second stripping column (K3) with a packed bed or packing under vacuum, in co- or countercurrent principle, the purified wash water fed to the washing step and the exhaust gas is discharged. An INDEPENDENT CLAIM is also included for a device for carrying out the method, comprising the washing column as gas washer, the first stripping column and the second stripping column as vacuum column. The washing column and the both stripping columns are arranged in a row. The washing column comprises the packed bed or packing with a surface of 300-900 mm2/m3 and a bed height of 2-16 m. The first stripping column contains the packed bed or the packing with a surface area of 350-900 mm2/m3 and a bed height of 1-4 m. The second stripping column contains the packed bed or packing with a surface of 100-300 mm2/m3 and a bed height of 10-10m. The bottom of the second stripping column is connected over a wash water conducting line with the head of the washing column, where in the circuit line (04), a pump is attached.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a device for carrying out the method for purifying the raw gas (Drawing includes non-English language text).    Line for conducting biogas (01)    Line for removing methane gas (02)    Line for conducting biomethane coagulant (03)    Circuit line (04)    Line for conducting contaminated wash water (05)