Distillation: processes – separatory – And recovering heat by indirect heat exchange – Utilizing recovered heat for heating the distillation zone
Reexamination Certificate
2011-07-19
2011-07-19
Manoharan, Virginia (Department: 1771)
Distillation: processes, separatory
And recovering heat by indirect heat exchange
Utilizing recovered heat for heating the distillation zone
C062S238500, C062S238700, C062S324100, C062S498000, C202S153000, C202S182000, C202S202000, C203S027000, C203S098000, C203S099000, C203SDIG016, C203SDIG016, C203SDIG019, C203SDIG025, C585S809000
Reexamination Certificate
active
07981256
ABSTRACT:
A splitter system is disclosed that produces a product stream from a mixed stream of two materials with similar boiling points. A multi-stage heat pump compressor is used in combination with a bottoms reboiler and an intermediate reboiler resulting in reduced utility consumption. The appropriately placed intermediate reboiler enables use of a lower temperature heat source relative to the bottoms reboiler heat source. As a result, a lower pressure overhead vapor stream can be used to deliver heat to both the intermediate and bottoms reboilers, thereby conserving energy. The first stage of the multi-stage heat pump compressor delivers pressurized overhead vapor to the intermediate reboiler and the second stage provides pressurized overhead vapor to the bottoms reboiler. The disclosed design and method lessens the heat pump compressor power consumption and trim condenser duty for a propylene/propane splitter system by over 20%. A third stage of compression upstream of the overhead trim condenser may be used for purposes of making the column pressure and temperatures independent of the trim condenser temperature.
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Sechrist Paul A.
Wegerer David A.
Manoharan Virginia
Paschall James C
UOP LLC
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