Process For Treating A Gas Stream From Plastic Pyrolisis And/Or Biomass Pyrolisis, And Installation For Integration Into A Steam Cracker

A process for treating at least one gas stream derived from pyrolysis of plastic and/or biomass, the process comprising:

• quenching and washing with water the gas stream derived from pyrolysis of plastic and/or biomass in a quench/wash unit, and separating an aqueous phase from a washed gas stream;
• compressing then cooling the washed gas stream to form a compressed gas stream;
• washing the compressed gas stream under pressure to form a washed gas stream;
• passing the washed gas stream through at least one acid removal unit to form an acid-depleted gas stream;
• drying the acid-depleted gas stream to form a dry gas stream;
• passing the dry gas stream through at least one impurity removal unit to form a purified gas stream;
• and
• feeding the purified gas stream into a cryogenic absorption unit and supplying the cryogenic absorption unit with a hydrocarbon cryogenic solvent to obtain a light gas residue at a first outlet of the cryogenic absorption unit, and a fraction of C2+ hydrocarbons at a second outlet of the cryogenic absorption unit.