| abstract |
Procedure for the separation of C2 or C2 + hydrocarbons from a gas stream (1, 2) containing light hydrocarbons and possibly components that boil at temperatures lower than methane, in which the gas stream (1) put under a pressure elevated, cooled (in E1), partially condensed and in a first stage of separation (T1) separated into a liquid fraction (3, 3 ¿) and a gas fraction (4), and the liquid fraction (3, 3 ¿) is decomposed by rectification in a second stage of separation (T2) into a stream of products (17, 17¿) that essentially contains C2 or C2 + hydrocarbons, and into a residual gas stream (13) that predominantly contains components boiling at lower temperatures, realizing that the gas fraction (4) from the first stage of separation (T1), resulting after partial condensation, is separated by rectification in a third stage of separation (T3) in a fraction liquid n (6¿) and a gas fraction (8) and the liquid fraction (6¿) obtained in the third separation stage (T3) is fed (by 7¿) as a reflux fraction to the first separation stage (T1) with rectification action. |