Abstract
The catalytic effects of various acids (sulfuric acid, hydrochloric acid, phosphoric acid, and formic acid) on the depolymerization of organosolv lignin under mild microwave heating (approximately 100 W, 160 °C for 30 min) were investigated. The liquid product was separated from the solid residue and analyzed by gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR). The solid residue was analyzed with thermogravimetric analysis (TG-DTG) and observed by scanning electron microscopy (SEM). The experimental results showed that sulfuric acid exhibited a better catalytic effect than the other acids. The SEM and TG-DTG results showed that the solid residue from sulfuric acid-catalyzed depolymerization was not only remarkably smaller than that of the other groups, but also presented a faster thermal decomposition rate. The molecular weight (Mw, weight-average) of the liquid product (Mw = 1020) from sulfuric acid-catalyzed depolymerization was also lower than that of the other groups.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 412-424 |
| Number of pages | 13 |
| Journal | BioResources |
| Volume | 13 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 1 2018 |
Bibliographical note
Funding Information:This work was supported by the Natural Science Foundation of China (Project No. 21466022) and the Key Project (Nos. 20161BBF60057 and GCXZ2014-124) of Jiangxi Provincial Department of Science and Technology for financial support (Jiangxi, China).
Keywords
- Acid-catalyzed depolymerization
- Microwave-assisted depolymerization
- Organosolv lignin