methods for the simultaneous elimination of co2 and bearin from methane, c2 and higher hydrocarbons and co2 enthatenden gaseous hydrocarbons.

摘要

The gas mixture to be treated (1) is washed (5) between 0 DEG C and -45 DEG C by means of a solvent (6) for CO2 and C3 and higher hydrocarbons to produce a methane stream (8) containing not more than 2 mol% of CO2 and a CO2-rich liquid phase (11) containing at least 80 mol% of C3 and higher hydrocarbons from the gas mixture (1). The liquid phase (11) is subjected to a demethanization (12, 17) producing a demethanized rich solvent (27) and a methane-rich gas phase (22), and then the rich solvent (27) is subjected to a regeneration producing a regenerated solvent (34) which is recycled into the washing zone (5), and a gas mixture (42) containing the CO2 and the C2 and higher hydrocarbons which are present in the methanized rich solvent, the said gas mixture being separated by regenerative washing with a C5 and higher hydrocarbon solvent, into a CO2-rich acidic gas stream containing, expressed as methane equivalent, less than 10 mol% of hydrocarbons, and into a C2 and higher hydrocarbon cut (48) containing at least 80 mol% of the C3 and higher hydrocarbons present in the gas to be treated (1).