Patent ID: 7544284

Claim:
A process for the treatment of an effluent of a hydrocarbon conversion reaction, comprising a hydrocarbon liquid phase and a hydrogen-rich gaseous phase, in which: a) the effluent is separated into a liquid L 1 and a gas G 1 , under a pressure P 1 , b) at least a portion G 1 * of G 1 is compressed under a pressure P 2 >2×P 1 to obtain a gas stream G 1 ** that, after a partial condensation thereof or after a first contact with an absorbent liquid, is then brought into contact at a temperature that is less than or equal to 20° C. with at least a portion of L 1 , so as to recover a liquid L 2 and a hydrogen-rich gas G 2 , c) L 2 is then fractionated to obtain at least: a stabilized liquid L 4 a that is essentially free of LPG and lighter products, a liquid stream L 4 b that primarily comprises LPG, and a low-hydrogen fuel gas, and in which a light liquid stream LL that primarily comprises LPG, which after pressure reduction and at least partial re-evaporation, is mixed with gas G 1 * to increase its molecular weight before at least its final compression up to pressure P 2 , is recovered by fractionation of G 1 ** and/or from L 4 b.