Method for separating lignin from black liquor
US8771464B2 · kind B2 · utility
4Cited by
2References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 31, 2011 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Oct 4, 2031 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C11/0007
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method was developed for: a) improving the filterability of acid-precipitated lignin from kraft black liquors, b) increasing the dry solids content of the final lignin product, c) reducing the acid requirements and d) minimizing or eliminating TRS emissions during the acidification of black liquor to produce lignin and/or the subsequent suspension of the lignin in acid and/or the washing of the lignin with acid. No major difference in the chemical composition, MWD and main functional groups was found in the lignin of the present invention compared with lignins produced by conventional methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.