PROCESS FOR REFINING A BIOMETHANE BIOGAS STREAM AND RELATIVE APPARATUS FOR THE IMPLEMENTATION THEREOF

The present invention relates to a process for upgrading a stream of biogas (2) to biomethane and the relative apparatus for implementing it, said process comprising at least the following steps: a) supplying a part (4) of said biogas stream (2) to a cogeneration system (M) and producing a heating fluid (3) and electric energy (18); b) supplying said electric energy (18) at least to cooling means (R) and producing a cooling fluid (5); c) supplying the remaining part (6) of said biogas stream (2) to a treatment system (S) comprising at least a first (U1) and a second (U2) treatment unit each comprising at least one solid sorbent (25); in said treatment system (S) occurring, for at least a certain operating period under regime conditions, that: - the CO 2 present in said remaining part (6) of said biogas stream (2) is adsorbed on the solid sorbent (25) of said first treatment unit (U1) with the formation of a stream of biomethane (16'); - the solid sorbent (25) of said second treatment unit (U2) is subjected to regeneration with the formation of a stream of desorbed CO 2 (17') and a regenerated solid sorbent; said heating fluid (3) and said cooling fluid (5) being used for regulating the temperature of said solid sorbents (25).