Journal article
Thermal pretreatment of a high lignin SSF digester residue to increase its softening point
Journal of analytical and applied pyrolysis, Vol.142, p.103691
09/2019
Handle:
https://hdl.handle.net/2376/107192
Abstract
•Thermal pretreatment raises the softening point from 187 °C to 250 °C.•Organic and water soluble extractives do not act as plasticizers in the material.•Up to 50% of the weight of the sample can be volatilized during pretreatment.•Fixed C increases as a concentration effect rather than formation of new compounds.•Optimal processing time is 30 min at 300 °CB.
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 their softening points. 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 extra 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 min. Results showed that the softening point of the material could be increased from 187 °C to 250 °C, and that under the experimental conditions studied, 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.
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Details
- Title
- Thermal pretreatment of a high lignin SSF digester residue to increase its softening point
- Creators
- Daniel Howe - Pacific Northwest National Laboratory, 902 Battelle Blvd., Richland, WA 99352, USAManuel Garcia-Perez - Washington State University, Biological Systems Engineering, LJ Smith 205, Pullman, WA 99164-6120, USADanny Taasevigen - Pacific Northwest National Laboratory, 902 Battelle Blvd., Richland, WA 99352, USAJames Rainbolt - Pacific Northwest National Laboratory, 902 Battelle Blvd., Richland, WA 99352, USAKarl Albrecht - Pacific Northwest National Laboratory, 902 Battelle Blvd., Richland, WA 99352, USAHui Li - University of Idaho, Department of Forest, Rangeland, and Fire Sciences, 875 Perimeter Drive MSC1132, Moscow, ID 83844, USALiqing Wei - University of Idaho, Department of Forest, Rangeland, and Fire Sciences, 875 Perimeter Drive MSC1132, Moscow, ID 83844, USAArmando McDonald - University of Idaho, Department of Forest, Rangeland, and Fire Sciences, 875 Perimeter Drive MSC1132, Moscow, ID 83844, USAMichael Wolcott - Washington State University, Civil and Environmental Engineering, Pullman, WA 99164-1806, USA
- Publication Details
- Journal of analytical and applied pyrolysis, Vol.142, p.103691
- Academic Unit
- Composite Materials and Engineering Center; Biological Systems Engineering, Department of; Office of Clean Technology
- Publisher
- Elsevier B.V
- Identifiers
- 99900546766801842
- Language
- English
- Resource Type
- Journal article