基于RCOO^(-+)N(CH_3)_3R'型两性树脂法的MDEA溶液离子净化研究  

Study on ion purification of MDEA solution based on RCOO^(-+)N(CH_3)_3R' amphoteric resin method

作　　者：郑金欣 沈紫薇 郭宏垚 苗正朋 李稳宏[1] 李冬[1] ZHENG Jin-xin;SHEN Zi-wei;GUO Hong-yao;MIAO Zheng-peng;LI Wen-hong;LI Dong(School of Chemical Engineering,Northwest University,Xi’an 710069,China)

机构地区：[1]西北大学化工学院,陕西西安710069

出　　处：《应用化工》2019年第2期380-385,393,共7页Applied Chemical Industry

基　　金：陕西省青年科技新星项目(2016KJXX-32)

摘　　要：以RCOO^(-+)N(CH_3)_3R'为功能基团制备了一种两性交换树脂,对其孔结构、交换容量以及红外进行表征测试,通过阴阳离子的静态吸附实验,研究其对MDEA溶液中Fe^(3+)和C_2O_4^(2-)的等温吸附性能、吸附热力学以及动力学特性。结果表明,该树脂中两性基团含量基本相等,以介孔结构为主;等温吸附行为符合Langmuir模型,以内盐键为主要吸附位点等当量的吸附阴阳离子,对高价离子和有机酸根离子具有更高的吸附选择性;Fe^(3+)和C_2O_4^(2-)在两性树脂上的吸附符合以外扩散为控制步骤的Lagergren拟二级吸附模型,是混乱度减小的自发放热过程。An amphoteric exchange resin was prepared by using RCOO^-+N(CH 3)3R'as a functional group.The pore structure,exchange capacity and infrared were characterized.The static adsorption experiments of anions and cations were used to study Fe3+in MDEA solution.Isothermal adsorption performance,adsorption thermodynamics and kinetics of C 2O2-4.The results show that the content of amphiphilic groups in the resin is basically equal,mainly mesoporous structure;the isotherm adsorption behavior is consistent with the Langmuir model,and the internal salt bond is the equivalent adsorption site for the adsorption sites,and the high-valent ions and organic acid ions have higher adsorption selectivity;the adsorption of Fe3+and C 2O2-4 on the amphoteric resin conforms to the Lagergren pseudo-secondary adsorption model with the outer diffusion as the control step,which is the self-heating process with reduced chaos.

关 键 词：两性树脂 MDEA溶液 离子净化 吸附动力学 吸附热力学 

分 类 号：TQ028[化学工程]