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Distillation sequence for the purification and recovery of hydrocarbons

United States Patent

7,311,813
December 25, 2007
View the Complete Patent at the US Patent & Trademark Office
This invention is an improved distillation sequence for the separation and purification of ethylene from a cracked gas. A hydrocarbon feed enters a C2 distributor column. The top of the C2 distributor column is thermally coupled to an ethylene distributor column, and the bottoms liquid of a C2 distributor column feeds a deethanizer column. The C2 distributor column utilizes a conventional reboiler. The top of the ethylene distributor is thermally coupled with a demethanizer column, and the bottoms liquid of the ethylene distributor feeds a C2 splitter column. The ethylene distributor column utilizes a conventional reboiler. The deethanizer and C2 splitter columns are also thermally coupled and operated at a substantially lower pressure than the C2 distributor column, the ethylene distributor column, and the demethanizer column. Alternatively, a hydrocarbon feed enters a deethanizer column. The top of the deethanizer is thermally coupled to an ethylene distributor column, and the ethylene distributor column utilizes a conventional reboiler. The top of the ethylene distributor column is thermally coupled with a demethanizer column, and the bottoms liquid of the ethylene distributor column feeds a C2 splitter column. The C2 splitter column operates at a pressure substantially lower than the ethylene distributor column, the demethanizer column, and the deethanizer column.
Reyneke; Rian (Katy, TX), Foral; Michael (Aurora, IL), Papadopoulos; Christos G. (Naperville, IL), Logsdon; Jeffrey S. (Naperville, IL), Eng; Wayne W. Y. (League City, TX), Lee; Guang-Chung (Houston, TX), Sinclair; Ian (Warrington, GB)
Ineos USA LLC (Lisle, IL)
10/ 393,460
March 20, 2003
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under United States Department of Energy Cooperative Agreement No. DE-FC07-01ID14090.