Title:
リグニンを黒色液から分離する方法
Document Type and Number:
Japanese Patent JP5002458
Kind Code:
B2
Abstract:
Method for separating lignin from black liquor includes the following steps: a) precipitating lignin by acidifying black liquor and thereupon dewatering, b) suspending the lignin filter cake obtained in step a) to obtain a second lignin suspension and adjusting the pH level to approximately that of the washing water of step d) below, c) dewatering of the second lignin suspension, d) adding washing water and performing a displacement washing at substantially constant conditions without any dramatic gradients in the pH, and e) dewatering the lignin cake produced in step d) into a high dryness and displacing the remaining washing liquid in the filter cake, whereby a lignin product is obtained which has an even higher dryness after the displacement washing of step d). The lignin product or an intermediate lignin product obtained by the method, and its use, preferably for the production of heat or chemicals is also disclosed.
Inventors:
Fredrik Ehmann
Terriunder, hans
Tomani, Pell
Accelerated, Peter
Terriunder, hans
Tomani, Pell
Accelerated, Peter
Application Number:
JP2007531127A
Publication Date:
August 15, 2012
Filing Date:
September 08, 2005
Export Citation:
Assignee:
LignoBoost A B
International Classes:
C08H7/00; C02F1/52; D21C11/00; D21C
Domestic Patent References:
| JP1139889A |
Foreign References:
| WO1990006964A1 |
Attorney, Agent or Firm:
Patent business corporation Odashima patent office