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Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

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Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab of Biomass Engineering and Material Jiangsu Province, National Engineering Lab. for Biomass Chemical Utilization, Key and Open Lab of Forest Chemical Engineering, SAF, Nanjing 210042, China
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College of Light Industry Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
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Authors to whom correspondence should be addressed.
Materials 2020, 13(2), 361; https://doi.org/10.3390/ma13020361
Received: 10 December 2019 / Revised: 7 January 2020 / Accepted: 8 January 2020 / Published: 12 January 2020
Pretreatment is an essential process for the extensive utilization of lignocellulose materials. The effect of four common organic acid pretreatments for Kraft dissolving pulp production was comparatively investigated. It was found that under acidic conditions, hemicellulose can be effectively removed and more reducing sugars can be recovered. During acetic acid pretreatment, lignin that was dissolved in acetic acid could form a lignin-related film which would alleviate cellulose hydrolysis, while other organic acids caused severe cellulose degradation. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometry (XRD) were used to characterize the pretreated chips in the process. Lignin droplets were attached to the surface of the treated wood chips according to the SEM results. The FTIR spectrum showed that the lignin peak signal becomes stronger, and the hemicellulose peak signal becomes weaker with acid pretreatment. The XRD spectrum demonstrated that the crystallinity index of the wood chips increased. The acetic acid pretreatment process-assisted Kraft process achieved higher yield (31.66%) and higher α-cellulose (98.28%) than any other organic acid pretreatment. Furthermore, extensive utilization of biomass was evaluated with the acetic acid pretreatment-assisted Kraft process. 43.8% polysaccharide (12.14% reducing sugar and 31.66% dissolving pulp) and 22.24% lignin (0.29% acetic acid lignin and 21.95% sulfate lignin) were recovered during the process. Biomass utilization could reach 66.04%. Acetic acid pretreatment is a promising process for extensive biomass utilization. View Full-Text
Keywords: eucalyptus pretreatment; organic acid; dissolving pulp eucalyptus pretreatment; organic acid; dissolving pulp
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Chen, Y.; Yan, Z.; Liang, L.; Ran, M.; Wu, T.; Wang, B.; Zou, X.; Zhao, M.; Fang, G.; Shen, K. Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production. Materials 2020, 13, 361.

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