Thermal Pretreatment of a High Lignin SSF Digester Residue to Increase its Softening Point
Journal Article
·
· Journal of Analytical and Applied Pyrolysis
- BATTELLE (PACIFIC NW LAB)
- Washington State University
- University of Idaho
Residues high in lignin and ash generated from the simultaneous saccharification and fermentation of corn stover were thermally pretreated in an inert (N2) atmosphere to study the effect of time and temperature on its softening point. These residues are difficult to feed into gasifiers due to premature thermal degradation and formation of reactive liquids in the feed lines, leading to plugging. The untreated and treated residues were characterized by proximate and ultimate analysis, and then analyzed via TGA, DSC, 13C NMR, Py-GC-MS, CHNO/S, and TMA. Interpretation of the compositional analysis indicates that the weight loss observed during pretreatment is mainly due to the thermal decomposition and volatilization of the hemicelluloses and amorphous cellulose fractions. Fixed carbon increases in the pretreated material, mostly due to a concentration effect rather than the formation of new poly-aromatic material. The optimal processing time and temperature to minimize the production of carbonyl groups in the pretreated samples was 300°C at a time of 30 minutes. Results showed that the softening point of the material could be increased from 187°C to 250°C, and that pretreatment temperature plays a more important role than time. The increase in softening point was mainly due to the formation of covalent bonds in the lignin structures and the removal of low molecular weight volatile intermediates.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1768025
- Report Number(s):
- PNNL-SA-112847
- Journal Information:
- Journal of Analytical and Applied Pyrolysis, Journal Name: Journal of Analytical and Applied Pyrolysis Vol. 142
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermal pretreatment of a high lignin SSF digester residue to increase its softening point
Steam gasification of a thermally pretreated high lignin corn stover simultaneous saccharification and fermentation digester residue
One-pot generation of lignin microspheres and digestible substrate with a polyol-DES pretreatment in high solid loading
Journal Article
·
Wed Mar 23 20:00:00 EDT 2016
· Journal of Analytical and Applied Pyrolysis
·
OSTI ID:1422781
Steam gasification of a thermally pretreated high lignin corn stover simultaneous saccharification and fermentation digester residue
Journal Article
·
Sat Dec 31 23:00:00 EST 2016
· Energy (Oxford)
·
OSTI ID:1344034
One-pot generation of lignin microspheres and digestible substrate with a polyol-DES pretreatment in high solid loading
Journal Article
·
Thu Feb 02 19:00:00 EST 2023
· Journal of Cleaner Production
·
OSTI ID:1969805