| PIL | protic ionic liquid |
| [Py][Ac] | pyridinium acetate |
| [Mim][Ac] | 1-methylimidazolium acetate |
| [Pyrr][Ac] | pyrrolidinium acetate |
| MWD | molecular weight distribution |
| DOU | degree of unsaturation |
| CS | corn stover |
| K. lignin | kraft lignin |
| MM2 | molecular mechanics 2 |
| %e | lignin extraction efficiency |
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