Viscosity of Prehydrolysis Liquor of a Hardwood Kraft-Based Dissolving Pulp Production Process

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• 作者：Haitang Liu ; Huiren Hu ; Ashwini Nairy ; M. Sarwar Jahan ; Guihua Yang ; Yonghao Ni
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：March 20, 2013
• 年：2013
• 卷：52
• 期：11
• 页码：3974-3979
• 全文大小：300K
• 年卷期：v.52,no.11(March 20, 2013)
• ISSN：1520-5045

文摘

In this study, experimental viscosity results of hardwood prehydrolysis liquor (PHL) from the kraft-based dissolving pulp production process were obtained and used to develop empirical models describing the effect of temperature, solid content, the interaction between solute and solvent, and the concentration of lignin and hemicelluloses. The concentration, molar mass, and molecular weight of lignin and polysaccharide of PHL, all are the factors that affect the rheological behavior of the PHL. The results showed that, on the one side, Zaman and Fricke鈥檚 model gave better fitting when the viscosity is lower, on the other hand, a much better fitting of the Moosavifar鈥檚 model could be obtained by taking interaction between solute and solvent, solids content, concentration of lignin and hemicelluloses into account when the viscosity is higher, because of the interaction between solute lignin/hemicelluloses and solvent water, and the aggregation of lignin with itself, hemicelluloses with itself, and lignin with hemicelluloses. Consequently, using two different correlations in covering different viscosity value regions (畏 > 2 mPa s or 畏 < 2 mPa s) of PHL led to better fitting of the data than those using just one single correlation.