PROCESS AND INSTALLATION OF TREATED NATURAL GAS PRODUCTION FROM A TREATY RICH IN C3 + HYDROCARBONS AND AT LEAST CERTAIN CONDITIONS FROM AN ETHANE RICH CURRENT FROM A NATURAL DEPARTURE GAS

摘要

a process and installation for simultaneous production of treated natural gas, a C3-3 hydrocarbon-rich cut and, at least under certain production conditions, an ethane-rich stream from a starting natural gas. This process comprises cooling the starting natural gas (13) and introducing it into a column (35) for the recovery of hydrocarbons. it comprises recovering the top stream (131) from column (35) to form treated natural gas (15), and recovering the bottom stream (171) from column (35) for its introduction to a feed level. (p 1) of a fractionation column (61) provided with a top condenser (63). column (61) produces in the background said cut of hydrocarbons (3) + (17). The process comprises recovering the ethane-rich stream (19) from an intermediate level (p2) of column (61) above said feed level (p1) and producing a secondary reflux stream (191). ) from said top condenser (63) introduced at reflux on top of the recovery column (35).