Abstract: An apparatus for compressing gaseous refrigerant for use in a refrigeration circuit of a liquefaction plant, which refrigeration circuit has an inlet, a first outlet for refrigerant at low pressure, a second outlet for refrigerant at intermediate pressure, a third outlet for refrigerant at high pressure and a fourth outlet for refrigerant at high-pressure, which apparatus comprises a first and a second compressor, wherein the first compressor has a main inlet connected to the first outlet, a side-inlet connected to the third outlet and an outlet connected to the inlet of the refrigeration circuit, and wherein the second compressor has a main inlet connected to the second outlet, a side-inlet connected to the fourth outlet and an outlet connected to the inlet of the refrigeration circuit.

Abstract: Apparatus (30) for compressing gaseous refrigerant for use in a refrigeration circuit (2) of a liquefaction plant, which refrigeration circuit (2) has an inlet (5), a first outlet (6) for refrigerant at low pressure, a second outlet (7) for refrigerant at intermediate pressure, a third outlet (8) for refrigerant at high pressure and a fourth outlet (9) for refrigerant at high-high pressure, which apparatus (30) comprises a first and a second compressor (31a, 31b), wherein the first compressor (31a) has a main inlet (36) connected to the first outlet (6), a side-inlet (37) connected to the third outlet (8) and an outlet (38) connected to the inlet (5) of the refrigeration circuit (2), and wherein the second compressor (31b) has a main inlet (39) connected to the second outlet (7), a side-inlet (40) connected to the fourth outlet (9) and an outlet (41) connected to the inlet (5) of the refrigeration circuit (2).

Abstract: Liquefying a stream enriched in methane comprising a) supplying a natural gas stream to scrub column, removing in the scrub column heavier hydrocarbons from the natural gas stream to obtain a gaseous overhead stream withdrawn from the top of the scrub column, partly condensing the gaseous overhead stream and removing from it a condensate stream, which is returned to the upper part of the scrub column as reflux; b) liquefying the stream enriched in methane in a tube arranged in a main heat exchanger by indirect heat exchange with a multicomponent refrigerant evaporating at low refrigerant withdrawn from the shell side of the main heat exchanger and partly condensing it at an elevated refrigerant pressure, and c) compressing the multicomponent refrigerant pressure in a tube arranged in an auxiliary heat exchanger by indirect heat exchange with an auxiliary multicomponent refrigerant evaporating at low auxiliary refrigerant pressure to obtain multicomponent refrigerant for use in step b), wherein partly condensi

Abstract: The present invention relates to a process of liquefying a gaseous, methane-rich feed to obtain a liquefied product by supplying the gaseous, methane-rich feed at elevated pressure to a first tube side of a main heat exchanger at its warm end, cooling, liquefying and sub-cooling the gaseous, methane-rich feed against evaporating refrigerant to get a liquefied stream, removing the liquefied stream from the main heat exchanger at its cold end and passing the liquefied stream to storage as liquefied product, removing evaporated refrigerant from the shell side of the main heat exchanger at its warm end, compressing in at least one refrigerant compressor the evaporated refrigerant to get high-pressure refrigerant, partly condensing the high-pressure refrigerant and separating the partly-condensed refrigerant into a liquid heavy refrigerant fraction and a gaseous light refrigerant fraction, sub-cooling the heavy refrigerant fraction in a second tube side of the main heat exchanger to get a sub-cooled heavy refriger