Dehydrogenation and pyrolysis product recovery with a common demethanizer
AssigneeUop LLC
InventorsSudipta K. Ghosh, Prashant Balyan, Xin X. Zhu, Kyle Cuellar, Fuyue Stephanie Li, Ernest J. Boehm
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Abstract
A process and apparatus integrate recovery of propylene from a pyrolysis reactor and a paraffin dehydrogenation reactor. A stripping column for fractionating a dehydrogenation stream is coupled with a demethanizer column for fractionating a pyrolyzed stream. The stripping overhead stream comprising C2− hydrocarbons are fractionated with the pyrolyzed stream in the demethanizer column. The coupling omits the need for a conventional deethanizer column and separate refrigeration system in the propane dehydrogenation unit.
Claims17
A process for separating ethane from propane comprising:
- fractionating a dehydrogenated stream into a C2− stream and a C3 stream;
- fractionating said C2− stream and a pyrolyzed stream to provide a C1 stream and a C2+ stream;
- and
- heat exchanging said C2− stream with said C2+ stream.
A process for separating ethane from propane comprising:
- dehydrogenating a propane stream to provide a dehydrogenated stream;
- fractionating said dehydrogenated stream into a C2− stream and a C3 stream;
- pyrolyzing a hydrocarbon stream to provide a pyrolyzed stream;
- fractionating said C2− stream and a pyrolyzed stream to provide a C1 stream and a C2+ stream;
- and
- heat exchanging said C2− stream with said C2+ stream.
An apparatus for separating ethane from propane comprising:
- a demethanizer column in downstream communication with a dehydrogenation reactor and a pyrolysis reactor;
- a stripping column in downstream communication with said dehydrogenation reactor and said demethanizer column in downstream communication with said stripping column, the stripping column configured to provide a C2− stream stripping overhead stream;
- and
- a heat exchanger in downstream communication with said stripping column and said demethanizer column, the heat exchanger configured to exchange heat between the C2− stripping overhead stream and a C2+ demethanizer bottoms stream.
Dependencies are inferred from the claim text.