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Toward sustainable and complete wood valorization by fractionating lignin with low condensation using an acid hydrotrope at low temperatures (≤80 °C)Author(s): Jinlan Cheng; Kolby Hirth; Qianli Ma; Junjun Zhu; Zhaojiang Wang; J. Y. Zhu
Source: Industrial & Engineering Chemistry Research. 58(17): 7063-7073.
Publication Series: Scientific Journal (JRNL)
Station: Forest Products Laboratory
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DescriptionPoplar wood was fractionated under a range of conditions using an inexpensive and recyclable commercial aromatic acid, p-toluenesulfonic acid (p-TsOH), as an acid hydrotrope (AH). The fractionated cellulose-rich solid fraction demonstrated excellent physical and optical properties as papermaking fibers. The dissolved xylose can be dehydrated into furfural using the p- TsOH in the spent liquor without additional catalysts. The acid hydrotrope dissolved lignin (AHL) has high β-aryl ether linkage content (∼60%) and high molecular weight (∼4000 Da), similar to that of mill wood lignin (MWL). Increasing acid hydrotrope fractionation (AHF) severity increased AHL yield, but reduced β-aryl ether bonds, decreased molecular weight and increased AHL glass transition temperature. An AHL yield of 50% can be obtained while retaining approximately half of the β-O-4 linkages, beneficial for lignin valorization as a polymer in composites as well as for production of monomers or aromatics through subsequent depolymerization.
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CitationCheng, Jinlan; Hirth, Kolby; Ma, Qianli; Zhu, Junjun; Wang, Zhaojiang; Zhu, J. Y. 2019. Toward sustainable and complete wood valorization by fractionating lignin with low condensation using an acid hydrotrope at low temperatures (≤80 °C). Industrial & Engineering Chemistry Research. 58(17): 7063-7073.
KeywordsLignocellulose fractionation, lignin depolymerization and condensation, acid hydrotrope, nuclear magnetic resonance (NMR), catalysis
- Fractionation of herbaceous biomass using a recyclable hydrotropic p–toluenesulfonic acid (p–TsOH)/choline chloride (ChCl) solvent system at low temperatures
- Preserving both lignin and cellulose chemical structures: flow-through acid hydrotropic fractionation at atmospheric pressure for complete wood valorization
- Rapid and near-complete dissolution of wood lignin at ≤80°C by a recyclable acid hydrotrope
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