NOVELTY - Separation of C2+ hydrocarbons from mixed phase hydrocarbon stream (10) involves supplying mixed phase hydrocarbon feed stream to first gas/liquid separator (12); separating the feed stream into a first gaseous stream (20) from a first outlet (23, 25), and C2+ liquid stream(s) (30); cooling compressed stream (60) in heat exchanger(s) (16a) to provide a partly condensed hydrocarbon product stream; and adding a second gaseous stream (40) to a stream downstream of the first outlet. The second gaseous stream comprises boil-off gas (40a) drawn from liquid hydrocarbon storage tank(s).    USE - Method for separating C2+ hydrocarbons from a mixed phase hydrocarbon stream, e.g. partly vaporized liquefied natural gas (claimed).    ADVANTAGE - The method reduces the capital and running costs in the separation of C2+ hydrocarbons from a mixed phase hydrocarbon stream to accommodate a further gaseous hydrocarbon stream, e.g. boil-off gas. It allows to have C2+ extraction from a hydrocarbon stream or source, where a separate gaseous hydrocarbon stream, e.g. boil-off gas is efficiently accommodated. It avoids adding the second gaseous stream into the gas/liquid separator, instead the second gaseous stream is recovered as part of a useful product stream, thus providing greater volume or amount of a product stream than existing processes.    DETAILED DESCRIPTION - Separation of C2+ hydrocarbons from a mixed phase hydrocarbon stream (10), e.g. partly vaporized liquefied natural gas, involves:    (A) supplying a mixed phase hydrocarbon feed stream in the form of a partly vaporized hydrocarbon feed stream, to a first gas/liquid separator (12);    (B) separating the hydrocarbon feed stream in the first gas/liquid separator into a first gaseous stream (20) from a first outlet (23, 25), and C2+ liquid stream(s) (30);    (C) passing the first gaseous stream through a compressor (14) to provide a compressed stream (60);    (D) cooling the compressed stream in heat exchanger(s) (16a) to provide a partly condensed hydrocarbon product stream; and    (E) adding a second gaseous stream (40) to a stream downstream of the first outlet.    The second gaseous stream comprises boil-off gas (40a) drawn from liquid hydrocarbon storage tank(s). An INDEPENDENT CLAIM is included for apparatus for separating C2+ hydrocarbons from a mixed phase hydrocarbon stream comprising a first gas/liquid separator having an inlet (22) for a mixed phase hydrocarbon feed stream in the form of a partly vaporized hydrocarbon stream, a first outlet for a first gaseous stream and a second outlet (24, 26) for C2+ hydrocarbon liquid stream. A compressor compresses the first gaseous stream to provide a compressed stream. Heat exchanger(s) cools the compressed stream to provide partly condensed hydrocarbon product stream. A line connected to hydrocarbon storage tank(s) (32) provides a second gaseous stream comprising boil-off gas drawn from the hydrocarbon storage tank(s). A combiner combines the second gaseous stream with a stream downstream of the first outlet of the gas/liquid separator. The liquid hydrocarbon storage tank(s) is located in a sea-going transporter.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram of the process for separating C2+ hydrocarbons from a mixed phase hydrocarbon stream.    Mixed phase hydrocarbon stream (10)    First gas/liquid separator (12)    Compressor (14)    Heat exchanger (16a)    First gaseous stream (20)    Inlet (22)    First outlet (23, 25)    Second outlet (24, 26)    Liquid stream (30)    Storage tank (32)    Second gaseous stream (40)    Boil-off gas (40a)    Compressed stream (60)