Multi-stage psa process to remove contaminant gases from raw methane streams

A multi-stage Pressure Swing Adsorption process to remove contaminant gases from raw methane streams, comprising at least two Pressure Swing Adsorption stages:

• a first stage for removing Nitrogen and Oxygen, comprising the following steps:
• Feed (“FD”);
• Adsorption (“AD”);
• Equalization provided (“E↑”);
• Blowdown (“BD”);
• Evacuation (“EV”);
• Purge (“PG”);
• Equalization received (“E↓”),
• wherein the first stage comprises at least one adsorbent, or mixture thereof, with strong affinity for carbon dioxide and methane;
• second stage for removing Carbon Dioxide and residual Nitrogen and Oxygen comprising the following steps:
• Adsorption (“AD”);
• Co-current depressurization (“COD”);
• First equalization provided (“E1↑”);
• Second equalization provided (“E2↑”);
• Evacuation (“EV”);
• First equalization received (“E1↓”);
• Idle (“ID”);
• Second equalization received (“E2↓”);
• Idle (“ID”);
• wherein the second stage comprises at least one adsorbent, or mixture thereof, with strong affinity for carbon dioxide and methane.