Method to use heat energy from black liquor
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United States of America Patent
Stats
-
Oct 1, 2013
Grant Date -
Jan 21, 2010
app pub date -
Nov 20, 2007
filing date -
Nov 22, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The method is for retrieving heat from black liquor wherein the black liquor is withdrawn from a digester in association with the production of cellulose pulp. The black liquor at the withdrawal stage maintains a first withdrawal temperature. At least a part of the black liquor is led to a heat exchanger. An exchange of heat takes place in the heat exchanger between the black liquor and a bleaching filtrate that has been obtained from the bleaching plant. The exchange of heat results in the bleaching filtrate experiencing a raise in temperature of at least 5° C., after which the heated bleaching filtrate is used in the bleaching plant.
First Claim
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International Classification(s)
- 2007 Application Filing Year
- D21C Class
- 65 Applications Filed
- 39 Patents Issued To-Date
- 60 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- D21C Class
- 0 % this patent is cited more than
- 12 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Apr 1, 2025 |
