Impianto e metodo per la separazione di una miscela di gas contenente una pluralità di componenti, in particolare per l'ottenimento di biometano

Plant (100) and method (200) for the separation of a gas mixture (101) containing a plurality of gaseous components, comprising first and second membrane-based separation stages (10, 20) and a third gas separation stage with adsorption with oscillating pressure (30), which first, second and third gas separation stages acting in combination make it possible to obtain a first final flow of gas (21) enriched in a first component (A) of the initial gas mixture (101), for example methane, and a second final flow of gas (32), enriched in a second component (B) of the initial gas mixture (101), for example carbon dioxide.