Methods for separating and refining lignin from black liquor and compositions thereof
US10767308B2 · kind B2 · utility
1Cited by
36References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2015 |
| Grant date | Sep 8, 2020 |
| Priority date | — |
| Expiry date | Jul 7, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldBiotechnology
- WIPO sectorChemistry
Abstract
The invention relates methods and processes for the separation and refining of lignin from spent cooking liquor, called black liquor, present in industrial chemical plants, and compositions thereof. A process is provided for separating black liquor into at least two, three, or four streams selected from: (i) a gaseous stream comprising volatile sulfur compounds; (ii) a lignin-comprising stream produced by extracting lignin into a limited solubility solvent S1; (iii) a salt stream, comprising solid sodium and sulfate salts; and (iv) a salt-depleted and lignin-depleted aqueous stream comprising hydrocarbons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.