Method for separating lignin from black liquor
US9091023B2 · kind B2 · utility
5Cited by
2References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2014 |
| Grant date | Jul 28, 2015 |
| Priority date | — |
| Expiry date | Dec 16, 2034 |
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.