Process and installation for recovering and purifying of ethylen produced by hydrocarbon pyrolysis

Process for heavy duty recovery ethylene and heavier hydrocarbons from gas produced by pyrolysis of hydrocarbons (1) in wherein the liquid (12-15, 23) resulting from the fractional condensation of the cracking gas (1) for the recovering almost all ethylene feed a distillation column (C1), said deethanizer to various intermediate levels, on top of which, vapor (31) of the column distillate is treated directly into an acetylene hydrogenation reactor (R1), the effluent contains hardly more acetylene separated by a distillation column (C2) said demethanizer in a bottoms product (43) enriched in ethylene and ethane while the overhead product (44) is recycled by compression or treated for recovery higher ethylene.