Fcc product vapour separation method for improved product recovery

A hydrocarbon separation system comprising:

• a flow line for conveying a cracked reaction effluent comprising a mixture of hydrocarbons, including methane (C1) to heavy (C12+) hydrocarbons, from one or more cracking reactors;
• a main fractionator, wherein the main fractionator is configured to receive the mixture of hydrocarbons, and wherein the main fractionator is configured to separate the mixture of hydrocarbons into an overhead vapor comprising C1 to C6+ hydrocarbons, a side draw liquid fraction, and a bottoms product fraction;
• a main fractionator overheads condensation and high-pressure separation system configured to partially condense the overheads vapor and compress the uncondensed vapor to produce a compressed gas fraction and a compressed liquids fraction;
• a first distillation column configured to receive the compressed liquids fraction and to separate the compressed liquids fraction into a first overheads vapor fraction and a first bottoms fraction;
• and
• a second distillation column configured to receive the first bottoms fraction and to separate the first bottoms fraction into a second overheads fraction and a second bottoms fraction;
• an absorber configured to receive and contact in countercurrent flow a portion of the second bottoms fraction and the side draw liquid fraction with the compressed gas fraction, and to produce an absorber overheads fraction comprising offgas and an absorber bottoms fraction.