Green Processes Research Centre and Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, ON, P7B5E1, Canada.
Key Laboratory of Paper Science and Technology of Ministry of Education, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China.
Sci Rep. 2019 Feb 25;9(1):2672. doi: 10.1038/s41598-019-39135-z.
Currently, lignin of black liquor is incinerated to generate energy in pulp mills; but it has potential to be valorized through different modification methods. In this work, kraft lignin (KL) was polymerized with 2-[(methacryloyloxy) ethyl] trimethylammonium chloride (DMC) to produce cationic water soluble polymers. After producing five polymers with different molecular weights and charge densities, their flocculation efficiency in kaolin suspensions was investigated. The adsorption, zeta potential and flocculation results confirmed that the polymer with the highest charge density and molecular weight (KLD5) was a more effective flocculant than other polymers. The structure and size of flocs formed from the interaction of kaolin with KLD were determined by a focused beam reflectance measurement (FBRM). The sedimentation studies, conducted under gravitational (by vertical scan analyzer) and centrifugal force (by Lumisizer analytical centrifuge), revealed that KLD5 was very effective in flocculating kaolin particles.
目前，纸浆厂通过焚烧黑液中的木质素来产生能源；但通过不同的改性方法，木质素具有被进一步利用的潜力。在这项工作中，用 2-[(甲基丙烯酰氧基)乙基]三甲基氯化铵（DMC）聚合 kraft 木质素（KL），以生产阳离子型水溶性聚合物。在合成了五种具有不同分子量和电荷密度的聚合物后，研究了它们在高岭土悬浮液中的絮凝效率。吸附、ζ 电位和絮凝结果证实，电荷密度和分子量最高的聚合物（KLD5）比其他聚合物更有效。通过聚焦光束反射测量（FBRM）确定了高岭土与 KLD 相互作用形成的絮体的结构和大小。在重力（通过垂直扫描分析仪）和离心力（通过 Lumisizer 分析离心机）下进行的沉降研究表明，KLD5 对高岭土颗粒的絮凝非常有效。
