Rapid and near-complete dissolution of wood lignin at ≤80°C by a recyclable acid hydrotrope
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- Jinan Univ., (China). Key Lab. of Biomaterials of Guangdong Higher Education Inst., Dept. of Biomedical Engineering; US Dept. of Agriculture (USDA)., Madison, WI (United States), Forest Service, Forest Products Lab.
- Aalto Univ., Espoo (Finland). School of Chemical Engineering, Dept. of Bioproducts and Biosystems
- US Dept. of Agriculture (USDA)., Madison, WI (United States), Forest Service, Forest Products Lab.; South China Univ. of Technology (SCUT), Guangzhou (China). State Key Lab. of Pulp and Paper Engineering
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Biological Systems Engineering
- US Dept. of Agriculture (USDA)., Madison, WI (United States), Forest Service, Forest Products Lab.; Guangxi Univ. for Nationalities, Nanning (China). School of Chemistry and Chemical Engineering
- US Dept. of Agriculture (USDA)., Madison, WI (United States), Forest Service, Forest Products Lab.; Nanjing Forestry Univ. (China). Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources
- US Dept. of Agriculture (USDA)., Madison, WI (United States), Forest Service, Forest Products Lab.
- South China Univ. of Technology (SCUT), Guangzhou (China). State Key Lab. of Pulp and Paper Engineering
- US Dept. of Agriculture (USDA)., Madison, WI (United States), Forest Service, Forest Products Lab.; Univ. of Wisconsin, Madison, WI (United States). Dept. of Biological Systems Engineering
We report the discovery of the hydrotropic properties of a recyclable aromatic acid, p-toluenesulfonic acid (p-TsOH), for potentially low-cost and efficient fractionation of wood through rapid and near-complete dissolution of lignin. Approximately 90% of poplar wood (NE222) lignin can be dissolved at 80°C in 20 min. Equivalent delignification using known hydrotropes, such as aromatic salts, can be achieved only at 150°C or higher for more than 10 hours or at 150°C for 2 hours with alkaline pulping. p-TsOH fractionated wood into two fractions: (i) a primarily celluloserich water-insoluble solid fraction that can be used for the production of high-value building blocks, such as dissolving pulp fibers, lignocellulosic nanomaterials, and/or sugars through subsequent enzymatic hydrolysis; and (ii) a spent acid liquor stream containing mainly dissolved lignin that can be easily precipitated as lignin nanoparticles by diluting the spent acid liquor to below the minimal hydrotrope concentration. Our nuclear magnetic resonance analyses of the dissolved lignin revealed that p-TsOH can depolymerize lignin via ether bond cleavage and can separate carbohydrate-free lignin from the wood. p-TsOH has a relatively low water solubility, which can facilitate efficient recovery using commercially proven crystallization technology by cooling the concentrated spent acid solution to ambient temperatures to achieve environmental sustainability through recycling of p-TsOH.
- Research Organization:
- USDOE Bioenergy Research Centers (BRC) (United States). Great Lakes Bioenergy Research Center (GLBRC); Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; USDA; Chinese State Forestry Administration; Finnish Cultural Foundation; Chinese Scholarship Council (CSC)
- Grant/Contract Number:
- SC0018409; 2011-67009-20056
- OSTI ID:
- 1625976
- Journal Information:
- Science Advances, Vol. 3, Issue 9; ISSN 2375-2548
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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