FIELD: oil and gas industry.
SUBSTANCE: plant includes a turbo-expander, distillation columns, wash column, stripping column, low temperature separators, filters, multithreaded plate heat exchanger, regenerative heat exchanger, air coolers, reboilers for columns, pumps, tank, septic tank, reflux tank, container collecting water-methanol solution, control valve and safety valves with inlet connections for input and output of the respective gaseous and liquid process flows. Cold recovery for low-temperature separation is carried out only by pressure reduction and expansion of the excessively compressed gas in the turbo-expander gas unit with cold transfer in the multithreaded heat exchanger. The methanol is introduced into crystalline hydrate stagnant concentration zones, at that the additional variability of gas deethanizer processing is provided by three modes, depending on climatic conditions: summer, transient and winter energy saving - and by fractional methanol introduction into the most vulnerable from the crystalline hydrates accumulation position places of devices.
EFFECT: componentwise extraction of impurities in the low-cost cold production for distillation column, reduction of the crystalline hydrates formation.
13 cl, 2 dwg, 5 tbl
