Patent ID: 6576805
Filing Date: 2003-06-10
Classification: B01D,C10G,F25J,Y02P

Abstract:
A process for recovering olefins from hydrocarbons produced in a fluid catalytic cracking unit, the process comprising:a. providing hydrocarbons produced in a fluid catalytic cracking unit, said hydrocarbons comprising ethylene, ethane, propylene, propane, butane, butylene, and C5 and heavier components; b. pressurizing said hydrocarbons to a pressure in the range of approximately 120 psig to 300 psig; c. cooling said pressurized hydrocarbons; d. feeding said cooled, pressurized hydrocarbons to a separator operated at a temperature in the range of approximately 80 degrees F. to 120 degrees F. and a pressure in the range of approximately 120 psig to 270 psig; e. yielding from said separator a gas stream comprising a major portion of the propane and lighter components of said hydrocarbons and substantially all of the ethylene in said hydrocarbons; f. separating hydrogen and methane from said gas stream, thereby forming an ethylene and heavier stream; g. separating ethane and lighter components from said ethylene and heavier stream, thereby forming an ethane and lighter stream and a propylene and heavier stream; h. yielding from said separator a liquid stream that comprises a portion of said propylene, propane and heavier components of said hydrocarbons; i. feeding said liquid stream from said separator to a stripper tower; j. operating said stripper tower to remove as a stripper overhead stream a major portion of the propane and lighter components from said liquid stream fed to said stripper tower; k. feeding said stripper overhead stream into the hydrocarbons entering said separator; and l. yielding from said stripper tower bottom a de-propanized liquid stream.