Process for the recovery of an ethylene and propylene containing stream from a cracked gas resulting from hydrocarbon cracking

摘要

Process for the recovery of an ethylene and propylene containing stream from a cracked gas resulting from cracking a hydrocarbon stream, wherein the cracked gas is treated in an absorptive demethanizer with a C₄/C₅ solvent at a temperature between −10° C. and −40° C. to free the cracked gas from methane and hydrogen gas, whereafter the remaining stream is treated by distillation in a distillation unit to obtain a C₄/C₅ containing stream and the ethylene and propylene containing stream; whereafter the C₄/C₅ stream is treated with a hydrogen containing stream in a hydrogenation unit, whereafter a part of the hydrogenated C₄/C₅ stream is cooled to a temperature between −10° C. and −40° C. and recycled to the absorptive demethanizer and a part of the hydrogenated C₄/C₅ stream is separated.