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Novel pathway to produce high molecular weight kraft lignin-acrylic acid polymers in acidic suspension systems

机译：在酸性悬浮体系中生产高分子量牛皮纸木质素 - 丙烯酸聚合物的新途径

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摘要

Kraft lignin (KL) produced in kraft pulping process has a low molecular weight and solubility, which limits its application in industry. For the first time, KL was polymerized with acrylic acid (AA) in an acidic aqueous suspension system to produce a water soluble lignin-AA polymer with a high molecular weight in this work. The polymerization reaction was carried out using K2S2O8 as an initiator, and the influence of reaction conditions on the carboxylate group content and molecular weight of resultant lignin polymers was systematically investigated. The mechanism of polymerization of KL and AA was discussed fundamentally. The resulting lignin-AA polymer was characterized by Fourier Transform Infrared spectrophotometry (FTIR), proton nuclear magnetic resonance (1H-NMR) and elemental analyses. The results showed that the phenolic hydroxyl group (Ph-OH) content of KL promoted the polymerization under an acidic environment. Under the conditions of 1.5 wt% of initiator, 3.5 of pH, 10.0 of AA/lignin molar ratio, 0.15 mol L-1 of lignin concentration, 3 h and 80 degrees C, the carboxylate group content and the molecular weight of the polymer were 7.37 mmol g(-1) and 7.4 x 105 g mol(-1), respectively. The lignin-AA polymer was water soluble at a 10 g L-1 concentration and a pH higher than 4.5. Furthermore, the flocculation performance of lignin-AA polymer in an aluminium oxide suspension was evaluated. Compared with polyAA, the lignin-AA polymer was a more efficient flocculant for aluminium oxide suspension, which shows its potential to be used as a green flocculant in industry.
机译：在牛皮纸制浆过程中产生的Kraft木质素（KL）具有低分子量和溶解度，这限制了其在工业中的应用。首先，将K1用酸性水性悬浮液系统中的丙烯酸（AA）聚合，以在该工作中产生具有高分子量的水溶性木质素-AA聚合物。使用K2S2O8作为引发剂进行聚合反应，系统地研究了反应条件对所得木质素聚合物的羧酸盐基团含量和分子量的影响。从根本上讨论了K1和AA的聚合机制。通过傅里叶变换红外分光光度法（FTIR），质子核磁共振（1H-NMR）和元素分析，所得到的木质素-AA聚合物的特征在于。结果表明，K1的酚羟基（pH-OH）含量在酸性环境下促进聚合。在1.5wt％的引发剂的条件下，3.5 pH，10.0的AA /木质素摩尔比，木质素浓度为0.15mol L-1，3小时和80℃，羧酸酯基含量和聚合物的分子量7.37mmol g（-1）和7.4×105g mol（-1）。木质素-AA聚合物以10g L-1浓度和pH高于4.5的水溶性水溶性。此外，评价氧化铝悬浮液中木质素-AA聚合物的絮凝性能。与Polyaa相比，木质素-AA聚合物是一种更有效的氧化铝悬浮液的絮凝剂，其潜力显示为工业中的绿色絮凝剂。

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  • 来源
    《RSC Advances》 |2018年第22期|共15页
  • 作者

    Kong Fangong; Wang Shoujuan; Gao Weijue; Fatehi Pedram;

  • 作者单位

    Qilu Univ Technol Minist Educ Key Lab Pulp &

    Paper Sci &

    Technol Jinan 250353 Shandong Peoples R China;

    Qilu Univ Technol Minist Educ Key Lab Pulp &

    Paper Sci &

    Technol Jinan 250353 Shandong Peoples R China;

    Lakehead Univ Chem Engn Dept Thunder Bay ON P7B 5E1 Canada;

    Lakehead Univ Chem Engn Dept Thunder Bay ON P7B 5E1 Canada;

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  • 正文语种 eng
  • 中图分类 化学;
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