FIELD: technological processes.
SUBSTANCE: invention relates to a method of treating hydrocarbon feedstock containing hydrogen and hydrocarbons, including hydrocarbons C1-C4, according to which: a) separating hydrocarbon feedstock into gas phase (6) and liquid phase containing hydrocarbons (4); b) performing the first re-contact, contacting the liquid phase with gas phase (8) leaving step c) to a temperature of −20 °C to 60 °C, then separating the mixture from re-contacting the first gas stream enriched with hydrogen, and first liquid hydrocarbon flow; c) performing a second re-contact, bringing the first liquid hydrocarbon stream (13) into contact with gas phase (6) coming from step a), and recycled gas (14) coming from step f) at a temperature in the range of −20 °C to 60 °C, then a mixture of re-contacting is separated into a second gas stream (17) and a second liquid stream of hydrocarbons (18); d) compressing second gas stream (17) and sending said second gas stream as gas phase (8) to step b); e) fractionating the second liquid hydrocarbon stream (18) from step d) in fractional column (19) in order to separate gaseous head fraction (21) and liquid still fraction (20) containing hydrocarbons with more than 4 carbon atoms; f) condensing gaseous head fraction (21) coming from step e) and separating liquid phase (24) containing mainly hydrocarbons C3 and C4 and gas phase (14), which is returned to step c), wherein at least step b) or step c) is carried out in column (30, 40), in which gas and liquid flows are brought into contact in counter-flow.
EFFECT: technical result is improved degree of extraction of hydrocarbons C3-C4 and high degree of purification of hydrogen.
8 cl, 2 ex, 2 tbl, 4 dwg
