METHOD AND APPARATUS FOR SEPARATING A FUEL GAS CONTAINING AT LEAST 20 MOL. OF CO2 AND AT LEAST 20 MOL OF METHANE, BY PARTIAL CONDENSATION AND / OR BY DISTILLATION

摘要

Process for separating a feed gas containing at least 20 mol% of CO2 and at least 20 mol% of methane by partial condensation and / or distillation, the gas (1,2) being at a pressure of at least 40 bar abs, comprising at least the following steps: a. Relaxing at least a portion of the feed gas in a turbine (T-100) producing a feed stream expanded at a pressure of less than 90 bar abs b. Separation of at least a portion of the expanded feed stream by partial condensation and / or distillation thus obtaining a CO2-depleted gas (6, 8) and a CO2-enriched liquid (7, 9) in which the temperature of the gas The expanded supply at the outlet of the turbine is less than -56.6 ° C or less than -59 ° C and the process does not use an external refrigeration source.