METHOD FOR PRODUCING PROCESSED NATURAL GAS, FRACTION ENRICHED WITH C3 + - HYDROCARBONS, AND OPTIONAL, FLOW ENRICHED WITH ETHANE, AND ALSO RELATED TO THIS WAY

摘要

1. Method for the simultaneous production of treated natural gas (15), fraction (17) enriched in C-hydrocarbons, and, at least in some conditions for the production of ethane-enriched stream (19), from a natural gas containing methane feed stream (13) , ethane and C-hydrocarbons, wherein said process comprises the following steps: - the natural gas feed stream (13) is cooled and partially condensed in at least one first heat exchanger located upstream of the process stream (25) to obtain a cooled feed stream (113) ; - the cooled initial gas stream (113) is separated into a liquid stream (117) and a gas stream (115); - the liquid stream (117) is expanded and the stream formed from the liquid stream (117) is introduced into the C-hydrocarbon recovery column (35) the first intermediate level (N1); - from the gas stream (115) form the turbine power stream (121); - expand the power stream (121) in the dynamic expansion turbine (29) and introduce it into the extraction column (35) at the second intermediate level ( N2); - at least one part of the overhead stream (131) of the isolation column (35) is isolated and compressed to obtain natural gas (15), and the bottom stream of the recovery column (35) is also extracted to obtain a liquid stream (171) enriched with C-hydrocarbons; - a liquid stream (171) is introduced at the power level (P1) of the fractionation column (61) equipped with the upper condenser (63), while under the mentioned conditions an ethane-enriched stream (19) is generated from the stream leaving the fractionation column (61), and the fractionation column (61) generates a lower stream (181) intended to form at least at least partially, fractions of C-hydrocarbons; egg stream (190) reflux produced in the top condenser (63) is introduced into the column (61)