Condenser-reboiler system and method
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United States of America Patent
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Issued Date -
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app pub date -
Oct 5, 2016
filing date -
Jan 29, 2014
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In Force
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Abstract
A system and method for the concurrent condensation of a nitrogen-rich vapor and vaporization of an oxygen-rich liquid in a distillation column based air separation unit is provided. The disclosed system includes a condenser-reboiler heat exchanger located between a lower pressure column and a higher pressure column and configured to condense a nitrogen-rich vapor from the higher pressure column and partially vaporize an oxygen-rich liquid from the lower pressure column. Within the condenser-reboiler heat exchanger, the nitrogen-rich vapor flows in an upward direction such that any non-condensables present in the nitrogen-rich vapor will accumulate proximate the upper portion or top of the condenser-reboiler modules where they can be easily removed through venting.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
PRAXAIR TECHNOLOGY INC | 10 RIVERVIEW DR DANBURY CT 06810 |
International Classification(s)

- 2016 Application Filing Year
- F25J Class
- 228 Applications Filed
- 141 Patents Issued To-Date
- 61.85 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Chakravarthy, Vijayaraghavan S | Williamsville, US | 11 | 10 |
# of filed Patents : 11 Total Citations : 10 | |||
Kwark, Sang Muk | Williamsville, US | 8 | 28 |
# of filed Patents : 8 Total Citations : 28 | |||
Shelat, Maulik R | Williamsville, US | 36 | 67 |
# of filed Patents : 36 Total Citations : 67 |
Cited Art Landscape
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Patent Citation Ranking
- 1 Citation Count
- F25J Class
- 31.08 % this patent is cited more than
- 7 Age
Forward Cite Landscape
- No Forward Cites to Display

Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Jan 3, 2026 |
11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jan 3, 2030 |
Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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