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    Two biorefinery lignosulfonates (LSs), Ca-LS-DF and Na-LS-LP were, respectively, isolated from pilot-scale sulfite-pretreated spent liquor of lodgepole pine and fermentation residue of Douglas-fir harvest forest residue. The molecular weights of Na-LS-LP and Ca-LS-DF were approximately 9 000 and 11 000 Da, respectively. The two LSs were applied as dispersant for graphite in aqueous suspensions. The dispersion stability was evaluated by a scanning electron microscope and Turbiscan Lab Expert. LS performance in modifying graphite was better than that of a commercial dispersant Reax-85A as indicated by the Turbiscan TSI values, zeta potential of suspension particles, and SEM imaging. The practical importance of this study lies in the fact that the pilot-scale sulfite pretreatments that produced the two LSs also produced excellent bioethanol yields at high titer without detoxification and washing, suggesting the LSs are a true value-added coproduct for high yield biofuel production.

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    Qin, Yanlin; Yu, Lixuan; Wu, Ruchun; Yang, Dongjie; Qiu, Xueqing; Zhu, J.Y. 2016. Biorefinery lignosulfonates from sulfite-pretreated softwoods as dispersant for graphite. ACS Sustainable Chemistry and Engineering. 4(4): 2200-2205.


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    Lignosulfonate, Graphite, Dispersion stability, Lignin-coproducts, Biorefinery

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