Abstract
The valorization of the natural biopolymer lignin has been intensively studied due to its potential to replace petroleum-based polymers. In this study, mixed hardwood was treated with a high-boiling point solvent to produce an organosolv black liquor, which was precipitated under different pH conditions using mineral acids. The recovery yield, lignin content, and molecular weight of the black liquor precipitated at a given pH were characterized. It was found that most of the lignin could be recovered in the pH range of 2-5 and that the lignin content in the precipitate increased with a decrease in pH. In addition, the hardwood organosolv lignin showed a lower molecular weight and narrow polydispersity compared to hardwood kraft lignin.
| Translated title of the contribution | Characteristics of organosolv lignin precipitated via pH control |
|---|---|
| Original language | Korean |
| Pages (from-to) | 22-29 |
| Number of pages | 8 |
| Journal | Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry |
| Volume | 53 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2021 |
Keywords
- Hydrochloric acid
- Organosolv black liquor
- PH control
- Sulfuric acid