Dissolution of Wood Pulp in Aqueous NaOH/Urea Solution via Dilute Acid Pretreatment

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• 作者：Zhuqun Shi ; Quanling Yang ; Shigenori Kuga ; Yuji Matsumoto
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2015
• 出版时间：July 15, 2015
• 年：2015
• 卷：63
• 期：27
• 页码：6113-6119
• 全文大小：438K
• ISSN：1520-5118

文摘

Wood pulps with certain amounts of lignin were successfully dissolved in aqueous NaOH/urea solution by subjecting them to the dilute acid pretreatment. After the acid hydrolysis, viscosity-average degree of polymerization (DP_v) of the pulps decreased. The results revealed that both the DP_v and lignin contents influenced the dissolved proportions of wood pulps. When they were not so high, the wood pulps could almost completely dissolve with dissolved proportions >90%. In particular, the acid-pretreated unbleached kraft pulp with DP_v of about 500 and lignin content of 6.9% could dissolve in NaOH/urea solvent and achieve a maximum pulp concentration of 4 wt % in the obtained lignocellulose solution. Moreover, the acid-pretreated bleached thermomechanical pulp with a high lignin content of 14.2% also almost completely dissolved. The lignocellulose films prepared from these wood pulp/NaOH/urea solutions exhibited good transparency and bendability, thus maybe promising as new biobased materials.