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US 10,472,306 B1Granted
Process for separation of propylene from a liquefied petroleum gas stream
OwnerStanley J. Frey, Chunqing Liu +1inventors
InventorsStanley J. Frey, Chunqing Liu, Trung Pham
Life of this patent
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Abstract
The present invention relates to a combined C3/C4 splitter with a membrane system. More specifically, the present invention relates to a combined C3/C4 splitter column to separate highly pure propylene product from a liquefied petroleum gas stream, which eliminates a C3 splitter having over 120 trays and the additional equipment that a C3 splitter requires.
Claims13
A process, comprising:
- passing a feed stream comprising LPG to a dividing wall column to produce a first overhead stream comprising C3, a side draw stream comprising propane and a product stream comprising C4;
- passing at least a portion of the overhead stream to a heat pump compression to produce a heated overhead stream and passing the heated overhead stream to a heat pumped reboiler to produce a heat pumped product stream;
- passing the heat pumped product stream to a membrane unit;
- and
- passing a retentate stream comprising propane from the membrane unit back to the dividing wall column and passing a permeate stream from the membrane unit to produce a polymer grade propylene stream.
2 more elements
A process, comprising:
- passing a feed stream comprising LPG to a dividing wall column to produce a first overhead stream comprising propylene, a first side draw stream comprising C3, a second side draw stream comprising propane, and a product stream comprising C4, and flashing the overhead stream to produce a net gas stream and an overhead residual stream comprising propylene;
- passing the overhead residual stream back to the column;
- passing a first portion of the second side draw stream back to the column and passing the second portion of the second side draw stream as a propane product;
- passing the first side draw stream to a membrane unit;
- and
- passing a retentate stream comprising propane from the membrane unit to the column and passing a permeate stream from the membrane unit to a compression and cooling unit to produce a polymer grade propylene stream.
3 more elements
Dependencies are inferred from the claim text.