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Title: Rapid and near-complete dissolution of wood lignin at ≤80°C by a recyclable acid hydrotrope

Source: Science Advances, 2017. 3: 1-11.

Author(s)Chen, Liheng; Dou, Jinze; Ma, Qianli; Li, Ning; Wu, Ruchun; Bian, Huiyang; Yelle, Daniel J.; Vuorinen, Tapani; Fu, Shiyu; Pan, Xuejun; Zhu, Junyong (J.Y.)

Publication Year: 2017  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-2B  FPL-4709-1B

Abstract: 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 cellulose-rich 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.

Keywords: Fractionation/pretreatment biomass; delignification; dissolving pulp fibers; cellulose nanomaterials/fibrils; lignin nanoparticles; hydrotrope; enzymatic hydrolysis

Publication Review Process: Formally Refereed

File size: 4,096 kb(s)

Date posted: 09/27/2017

This publication is also viewable on Treesearch:  view
RITS Product ID: 87034
Current FPL Scientists associated with this product (listed alphabetically)
Yelle, Daniel
Research Forest Products Technologist
Zhu, JunYong
Research General Engineer
 

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