Separation process for olefin production
AssigneeLummus Technology Inc.
InventorsSunil Panditrao, Sanjeev Ram
Life of this patent
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Abstract
Improved processes for the separation of olefins from paraffins, such as propylene from propane are provided. Two product splitters are used in parallel to separate propylene from propane. One of the product splitters operates at a lower pressure, while the second product splitter operates at a higher pressure. The use of the two splitters in parallel provides a process for recovery of a high purity propylene product with lower energy consumption compared to prior art processes.
Claims17
A process for separation of an olefin from a paraffin in a product stream from a dehydrogenation system, comprising the steps of:
- (a) supplying a feed stream substantially comprised of a mixture of at least one olefin and at least one paraffin;
- (b) splitting the feed stream into a first portion and a second portion;
- (c) feeding the first portion of the feed stream to a first product splitter column and feeding the second portion of the feed stream to a second product splitter column, wherein the first product splitter column is operated at a higher pressure than the second product splitter column;
- (d) feeding at least a portion of the overhead stream from the second product splitter column to a heat pump to compress the second product splitter overhead stream;
- and
- (e) feeding steam from at least one steam turbine which drives the heat pump to the reboiler for the first product splitter column.
A process for separation of an olefin from a paraffin in a product stream from a dehydrogenation system, comprising the steps of:
- (a) supplying a feed stream substantially comprised of a mixture of at least one olefin and at least one paraffin;
- (b) splitting the feed stream into a first portion and a second portion;
- (c) feeding the first portion of the feed stream to a first product splitter column and feeding the second portion of the feed stream to a second product splitter column, wherein the first product splitter column is operated at a higher pressure than the second product splitter column;
- (d) feeding the overhead stream from the second product splitter column to a heat pump to compress the second product splitter overhead stream;
- (f) flowing the compressed second product splitter overhead stream from the heat pump through a reboiler for the second product splitter;
- (g) splitting the compressed second product splitter overhead stream into a reflux stream which is fed back to the second product splitter and a product stream;
- (h) splitting the overhead stream from the first product splitter into a reflux stream which is fed back to the first product splitter and a product stream;
- and
- (i) combining the steam from at least one steam turbine which drives a dehydrogenation reactor output compressor and steam from at least one steam turbine which drives the heat pump, and feeding the steam to the reboiler for the first product splitter column.
Dependencies are inferred from the claim text.