Dephlegmator process for carbon dioxide-hydrocarbon...

Details Dephlegmator process for carbon dioxide-hydrocarbon... Dephlegmator process for carbon dioxide-hydrocarbon...

F - Mech Eng,Light,Heat,Weapons

25

J

162/106

F25J 3/02 (2006.01) C07C 7/04 (2006.01)

Patent

CA 1295544

ABSTRACT A low capital cost, energy efficient process for separation of carbon dioxide, sulfide gases and hydrocarbons from carbonaceous off-gas streams, for example, oil shale retorting off-gases, coal gasification off-gases, oxygen fire flooding off-gases or carbon dioxide miscible flood enhanced oil recovery off-gases is disclosed. The process comprises separation of the off-gases into an essentially sulfur-free light fuel gas, a heavy hydrocarbon stream and a carbon dioxide gas stream wherein the off-gas is compressed if necessary and cooled prior to separation of the various streams in a distillation column. The carbon dioxide stream is expanded in an auto-refrigeration step to provide some of the necessary process refrigeration.

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