PROCESS FOR SIMULTANEOUS DECARBONATION AND DEGAZOLINATION OF A GAS MIXTURE MAINLY CONSISTING OF METHANE AND HYDROCARBONS OF C2 AND MORE AND INCLUDING CO2

摘要

P The gaseous mixture to be treated 1 is washed 5 between 0 degree (s) C and - 45 degree (s) C using a solvent 6 of CO2 and C3 hydrocarbons and more to produce a stream of methane 8 containing at most 2 mol% of CO2 and a liquid phase 11 rich in CO2 and containing at least 80 mol% of C3 hydrocarbons and more of the gas mixture 1. The liquid phase 11 is subjected to demethanization 12, 17 producing a rich solvent demethanized 27 and a gas phase rich in methane 22, then the rich solvent 27 is treated 55 to produce a stream of acid gas 44 rich in CO2 and containing, expressed in methane equivalent, less than 10 mol% of hydrocarbons, a cut d 'C2 and higher hydrocarbons 48 containing more than 80 mol% of the C3 and higher hydrocarbons present in the gas mixture 1 and a regenerated solvent 34, which is recycled to the washing zone 5. /P