NOVELTY - The process of producing a stream rich in methane (12) and a stream rich in C2+ hydrocarbons (14) from a feed stream containing hydrocarbons, comprises separating feed stream into a first fraction and a second fraction of the feed stream, introducing the first fraction of the feed stream in a first heat exchanger (20), cooling the first fraction of the feed stream in the first heat exchanger, and introducing the first fraction of the cooled feed stream in a first separator tank to produce a light overhead stream of head and a heavy bottom stream.    USE - The process is useful for producing a stream rich in methane and a stream rich in C2+ hydrocarbons from a feed stream containing hydrocarbons.    ADVANTAGE - The process is capable of easily and safely producing a stream rich in methane and a stream rich in C2+ hydrocarbons from a feed stream containing hydrocarbons with high efficiency and good flexibility.    DETAILED DESCRIPTION - The process of producing a stream rich in methane (12) and a stream rich in C2+ hydrocarbons (14) from a feed stream containing hydrocarbons, comprises separating feed stream into a first fraction and a second fraction of the feed stream, introducing the first fraction of the feed stream in a first heat exchanger (20), cooling the first fraction of the feed stream in the first heat exchanger, introducing the first fraction of the cooled feed stream in a first separator tank to produce a light overhead stream of head and a heavy bottom stream, dividing the light stream of head into a fraction for feeding the turbine and a fraction for feeding the column, expanding the turbine feeding fraction in a first turbine of dynamic expansion and introducing a portion of the released fraction in the first turbine in middle part of a first distillation column, cooling and condensing the part of the fraction for feeding the column in a second heat exchanger, expanding and introducing the feed fraction of the cooled column in upper part of the first distillation column, expanding and partially vaporizing the heavy bottom stream in the first heat exchanger and introducing heavy bottom stream expanded in a second separator tank to produce an overhead gas fraction and a liquid bottom fraction, expanding the liquid bottom fraction and introducing in the middle part of the first distillation column, cooling and condensing a part of the overhead gas fraction in the second heat exchanger and introducing in the upper part of the first distillation column, recovering a stream from column base at the bottom of the first distillation column, recovering and reheating a stream of column head rich in methane, compressing a fraction of the stream of the column head in a first compressor coupled to the first turbine for dynamic expansion and in a second compressor, forming methane-rich stream from the stream of the heated and compressed column head, sampling a withdrawing stream in the stream of column head, cooling and introducing cooled withdrawing stream in an upper part of the first distillation column, introducing a part of the second fraction of the feed stream in a second turbine for dynamic expansion different from the first dynamic expansion turbine, forming a cooled reflux stream from a part of an effluent obtained from a dynamic expansion turbine, introducing cooled reflux stream obtained from the heat exchanger in the first distillation column.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic flow diagram of an installation for production of stream rich in methane and a stream rich in C2+ hydrocarbons.    Stream rich in methane (12)    Stream rich in C2+ hydrocarbons (14)    Gaseous stream (16)    First heat exchanger (20)    First disengager. (22)