| 摘要 |
Processes and systems for lowering molecular weight of lignin generally includes first isolating a dense liquid lignin phase from black liquor and subjecting the dense liquid lignin phase to a temperature and pressure for a period of time to effect an average molecular weight distribution of the lignin. Solid lignin produced with the lowered molecular weight is then isolated. The systems and processes may further include an oxidation unit for oxidizing the black liquor and intermediate streams to remove or mitigate malodorous or toxic emissions. |
