Currently, kraft lignin is burned in the recovery cycle of the kraft pulping process; despite its high potential to be extracted and converted into value-added products. In this work, kraft lignin (KL) was copolymerized with acrylamide (AM) and 2-[(methacryloyloxy) ethyl] trimethylammonium chloride (DMC) to produce cationic copolymers. Copolymers with two different molecular weights of 168,200 g/mol (KAD-1) and 103,000 g/mol (KAD-2), but with a similar charge density of 1.15 meq/g, were selected and the flocculation efficiency of the copolymers in two different clay suspensions was investigated. Suspension pH affected the adsorption of the copolymers on clay particles and the removal of the particles from the suspension. At a 8 mg/g dosage, KAD-1 adsorbed more than KAD-2 as it was larger and thus developed more bridging with clay particles. The size of particles raised from 4.7 for kaolin to 16.3 μm for kaolin/KAD-1 flocs and 15.1 μm for kaolin/KAD-2 flocs, and it increased from 6.1 for bentonite to 18.97 μm for bentonite/KAD-1 flocs and 15.35 μm for bentonite/KAD-2 flocs in the presence of 8 mg/g of copolymers, respectively. The adsorption, zeta potential and flocculation analyses confirmed that KAD-1 was a more effective flocculant than KAD-2. The evidence for the agglomeration of clay particles via bridging and electrostatic patch mechanisms was also discussed in this work.

目前，牛皮纸制木质素在牛皮纸制浆过程的回收周期中燃烧。尽管有很大的潜力被提取并转化为增值产品。在这项工作中，将牛皮纸木质素（KL）与丙烯酰胺（AM）和2-[（（甲基丙烯酰氧基）乙基]三甲基氯化铵（DMC））共聚以生产阳离子共聚物。选择了两种分子量分别为168,200 g / mol（KAD-1）和103,000 g / mol（KAD-2），但电荷密度相似的1.15 meq / g的共聚物，并且两种共聚物的絮凝效率研究了不同的粘土悬浮液。悬浮液的pH值影响共聚物在粘土颗粒上的吸附以及颗粒从悬浮液中的去除。在8 mg / g的剂量下，KAD-1的吸附量大于KAD-2，因为它更大，因此更容易与粘土颗粒形成桥连。颗粒尺寸从高岭土的4.7增大到高岭土/ KAD-1的絮凝物的16.3μm和高岭土/ KAD-2的絮凝物的15.1μm，从膨润土的6.1增大到膨润土/ KAD-1的絮凝物的18.97μm和15.35μm分别在8 mg / g共聚物的存在下用于膨润土/ KAD-2絮凝剂。吸附，ζ电势和絮凝分析证实，KAD-1是比KAD-2更有效的絮凝剂。在这项工作中，还讨论了通过桥接和静电补丁机制使粘土颗粒附聚的证据。Zeta电位和絮凝分析证实，KAD-1比KAD-2更有效。在这项工作中，还讨论了通过桥接和静电补丁机制使粘土颗粒附聚的证据。Zeta电位和絮凝分析证实，KAD-1比KAD-2更有效。在这项工作中，还讨论了通过桥接和静电补丁机制使粘土颗粒附聚的证据。