Method and system for treating lignin
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United States of America Patent
Stats
-
Nov 28, 2017
Grant Date -
Jul 21, 2016
app pub date -
Aug 8, 2014
filing date -
Aug 19, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention provides a method and a system for separating lignin from a lignin containing liquid medium, such as pulp mill black liquor, and treating the separated lignin. The method comprises at least the following steps: a) a precipitation stage (1), wherein a pH lowering agent (A) is added to the lignin containing slurry for precipitating lignin, b) followed by a first separation stage (2), wherein the precipitated lignin is separated as a lignin cake from the remaining liquid phase of the lignin containing slurry, c) a suspending stage (3), wherein the lignin cake is suspended for obtaining a lignin suspension, d) a hydrothermal carbonization stage (4), wherein the lignin suspension is treated for obtaining a slurry of carbon containing material, and e) a second separation stage (5), wherein the carbon containing material is separated from the slurry.
First Claim
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Family
International Classification(s)
- 2014 Application Filing Year
- C01B Class
- 1554 Applications Filed
- 1323 Patents Issued To-Date
- 85.14 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- C01B Class
- 27.23 % this patent is cited more than
- 8 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 | May 28, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | May 28, 2029 |
