FIELD: chemistry.
SUBSTANCE: invention relates to a method of recuperating hydrogen and methane from a stream of cracking gas in the low temperature part of an ethylene synthesis apparatus, which involves feeding a C2 fraction coming from an ethane separation apparatus (deethaniser) through a heat exchanger (E1) into the first section (A) of a multi-section condensate separator (D1). The condensate is tapped from the first section (A) of the multi-section condensate separator (D1) and fed into a methane separator (T1). Gas from the multi-section condensate separator (D1) is fed into the next heat exchanger (E2) and additionally cooled therein. The additionally cooled gas is fed into the second section (B) of the multi-section condensate separator (D1) in order to separate liquid. The condensate formed is again fed into the methane separator (T1). Gas from the second section (B) of the multi-section condensate separator (D1) is fed into an expander (XI) where it is expanded and then fed into the methane separator (T1) and the C2 fraction from the bottom of the methane separator (T1) is throttled while lowering its pressure to pressure which is predominant in the distillation column for C2 hydrocarbons, partially evaporated in the heat exchanger (E1) and fed into the distillation column for C2 hydrocarbons.
EFFECT: present method significantly lowers power consumption while simultaneously lowering capital investment.
3 cl, 2 dwg
