造纸黑液制备球形阳离子木质素吸附树脂

以造纸黑液中的碱木质素为原料,采用两步法制备球形阳离子木质素吸附树脂,并用扫描电镜和傅立叶变换红外光谱仪对其进行表征.第1步以造纸黑液中的碱木质素为原料,利用反相悬浮法制备球形木质素珠体,通过正交实验得出以占木质素质量1.5%的环氧氯丙烷为交联剂,吐温80为分散剂(含量为木质素质量的3%),煤油为分散相,O/W相比为3∶1,反应温度为90℃,搅拌速度为200r/min,反应时间1h为球形木质素珠体制备的最佳条件.第2步利用丙烯酰胺对球形木质素珠体接枝,得出以H₂O₂/Fe²⁺为引发剂,丙烯酰胺浓度为0.72mol/L,室温反应2h为接枝的适宜条件,在此条件下可得到离子交换容量为1.6405mmol/g的阳离子木质素吸附树脂.

Preparation of Spherical Lignin Cation Adsorption Resin with Black Pulping Liquor

Spherical lignin cation adsorption resin was obtained by two-step method with black liquor of paper mill and characterized by the Scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FTIR). Firstly, the spherical lignin beads were prepared with black liquor of paper mill by applying reverse-phase suspension polymerization technique, and the preparation conditions were also optimized. The suitable conditions include 200 r/min of stirring speed, 90 of reaction temperature, 1.0 h of reaction time and use epoxy chloropropane(1.5 % by weight of lignin) as cross-linking agent, the ideal volume ratio between oil phase and water phase was 31 by using kerosene oil as disperse phase, and the perfect dispersant agent was Tween 80(3% by weight of lignin). Secondly, the spherical lignin cation adsorption resin was developed by grafting the acrylamide onto the back-bone of the spherical lignin beads. The best concentration of acrylamide was 0.72 mol/L at ambient temperature for 2.0 h, and the ideal initiator system was the Fenton reagent of H₂O₂/Fe²⁺. Under the above conditions, the ion exchange capacity of the prepared resin could reach 1.640 5 mmol/g.