Insights into delignification behavior using aqueous p -toluenesulfonic acid treatment: comparison with different biomas
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ORIGINAL RESEARCH
Insights into delignification behavior using aqueous ptoluenesulfonic acid treatment: comparison with different biomass species Pengfei Li . Hairui Ji . Liwei Shan . Yuanfeng Dong . Zhu Long . Zhiyong Zou . Zhiqiang Pang
Received: 22 May 2020 / Accepted: 21 September 2020 Ó Springer Nature B.V. 2020
Abstract Exploring an efficient delignification technique is imperative for further advance on biorefinery, together with elucidation on affecting factors and mechanism of delignification. Biomass fractionation using the aqueous p-toluenesulfonic acid (p-TsOH) changed tremendously with biomass species. Herein, effect of biomass species on delignification using the aqueous p-TsOH treatment was investigated. Compared to cellulose and hemicelluloses removal, delignification was greatly affected by biomass species, and delignification of softwood was the toughest. The dissolved lignin and residual lignin in the pretreated biomass, together with the original lignin without
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03481-3) contains supplementary material, which is available to authorized users.
pretreatment were determined, analyzed and compared using various techniques. Essentially, the active linkages and groups in the dissolved lignin decreased compared to the original lignin from TGA and GPC analysis. However, the primary structure of lignin was not drastically altered after treatment from FTIR results. The high content of phenolic hydroxyl and the hydrophilic carboxyl in the original lignin of hardwood and grass were detected, which mainly accounted for their super solubility during the aqueous p-TsOH treatment. Moreover, the active aryl ether linkages reduced and C–C linkages increased for softwood after treatment. Compared with the guaiacyl unit, dissolution of the syringyl and p-hydroxyphenyl units were readily achieved. Therefore, the ideal feedstocks for the aqueous p-TsOH treatment are hardwood and grass species.
P. Li H. Ji Z. Pang (&) State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, Shandong Province, China e-mail: [email protected] L. Shan Z. Zou Z. Pang Technique Centre, MCC Paper Yinhe Co., Ltd, Linqing 252600, Shandong Province, China Y. Dong Z. Long Laboratory of Papermaking, School of Textiles & Clothing, Jiangnan University, Wuxi 214122, Jiangsu Province, China
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Cellulose
Graphic abstract
Keywords Biomass species p-toluenesulfonic acid Fractionation Delignification
Introduction Incessant advances on bio-refinery were prompted by the growing world-wide concerns on energy, resources and environmental protection (Zhang et al. 2017). Biorefinery involved integrated biomass-conversion process to sustainably produce value-added bio-based products such as fuels (e.g., biobutanol and bioethanol), energy (heat and power), chemicals and materials using biomass as fee
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