FIELD: petroleum industry.
SUBSTANCE: invention relates to the field pre-processing of hydrocarbon gases and can be used in the petroleum industry for processing associated petroleum gas. The invention relates to an associated petroleum gas topping plant including a compressor station, a recuperative heat exchanger, a separator equipped with a residue output line with a reducing apparatus and a gas output line, located whereon is a reflux column provided with an upper heat and mass exchange section, connected with the recuperative heat exchanger by a reflux gas output line with a reducing apparatus and equipped with a reflux output line with a reducing apparatus, wherein said plant also contains a gas drying and/or purification unit and a steam-stripping column with a heater, equipped with a propane-butane fraction output line and a gas output line connected with the compressor station. The associated petroleum gas supply line before the compressor station is connected with the stabilisation gas output line from the top of the steam-stripping column with a heater, and after the compressor station is divided into a supply line of the first part thereof, located whereon is a heater, and a supply line of the second part thereof, installed whereon as a recuperative heat exchanger is a multi-flow heat exchanger also located on the reflux gas output line and on the stabilisation gas output line, equipped with an external cold source. After the recuperative heat exchanger, the supply lines of the first and second parts of the associated petroleum gas are connected into one line, installed whereon are a separator and a reflux column, and the gas drying and/or purification unit is located either before the reflux column or before the multi-flow heat exchanger.
EFFECT: increase in the yield of the propane-butane fraction.
1 cl, 1 dwg, 1 ex
