method of purification of biogas, it is characterised by the removal of carbon dioxide is carried out by cooling the biogas liquid nitrogen, leading to phase separation in the way that nieuzdatniony biogas is addressed by pipeline (1) for a compressor (2) in order to increase the pressure, d for values higher than 1.5 mpa, and then flows through a heat exchanger (3),where brown is pre chilled biogas output from the installation, and then, after preliminary cooling, not cleaned biogas driven is the initial treatment (7), where there is a separation of water and removing hydrogen sulfide, and so prepared bioga with the led's heat exchanger (9),where, using liquid nitrogen is cooled to temperature in the range from - to - 72u00b0c 62, and then to a heat exchanger (9) biogas is addressed to separator (13), where there is a separation of carbon dioxide and other pollutants from methane.
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