Method for concentrating an aqueous caustic alkali via splitting a catholyte into a first stream for heat recovery and a second stream for evaporation
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United States of America Patent
Stats
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Aug 7, 2018
Grant Date -
Jul 9, 2015
app pub date -
Mar 23, 2015
filing date -
Aug 7, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for concentrating an aqueous caustic alkali produced by a membrane cell process by using a single or multiple effect evaporator system in which the vapor flows in a counter direction to the aqueous caustic alkali flow and the heat recovered from the catholyte circulation line is used as part of the concentration process. In one embodiment, a catholyte heat recovery heat exchanger and flash evaporation chamber are located after the last effect of a multiple effect evaporator system. In another embodiment, the catholyte heat recovery heat exchanger and flash evaporation chamber are located prior to the single or multiple effect evaporator system. In yet another embodiment, the catholyte heat recovery process is used in conjunction with additional heat exchanger processes to further concentrate the final product as desired.
First Claim
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International Classification(s)
- 2015 Application Filing Year
- C25B Class
- 409 Applications Filed
- 298 Patents Issued To-Date
- 72.87 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- C25B Class
- 0 % this patent is cited more than
- 7 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Feb 7, 2026 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Feb 7, 2030 |
