Process for the isomerization of c5/c6 hydrocarbon cuts with chlorinated compound recycling

A process for the isomerization of a feed of hydrocarbon compounds comprising C5 and/or C6 hydrocarbon compounds, said process comprising a loop for recycling at least one chlorinated compound, and in which process:

• a) an isomerization unit (1) is supplied with at least one liquid fraction of said feed of hydrocarbon compounds and the isomerization is carried out in the presence of a chlorinated catalyst;
• b) a stabilization unit (20) comprising at least one stabilization column (2) is supplied with the effluent obtained from the isomerization unit (1) and a separation is carried out in said stabilization unit (20) into:
• a gaseous effluent comprising at least one chlorinated compound;
• a liquid effluent comprising a concentration CA of C5+ compounds;
• and
• a liquid flow comprising at least one isomerate of the feed of hydrocarbon compounds;
• c) the following is carried out in an absorption unit (7) comprising at least one absorption column (3):
• a first contact between the gaseous effluent obtained from step b) and a washing fluid, said washing fluid being selected from a complementary liquid fraction of said feed of hydrocarbon compounds and/or at least a portion of said liquid flow comprising at least one isomerate of the feed of hydrocarbon compounds obtained from step b);
• said washing fluid comprising a concentration CB of C5+ compounds, with CA<CB;
• a second contact between the gaseous flow resulting from said first contact and said liquid effluent obtained from step b);
• d) a liquid flow enriched in chlorinated compounds is extracted from the absorption unit (7) and returned to the isomerization unit (1);
• e) said liquid flow comprising at least one isomerate of the feed of hydrocarbon compounds is extracted from the stabilization unit (20).