摘要
研究了以多孔聚丙烯膜为支撑体,N,N′-二(1-甲基庚基)乙酰胺(N-503)为膜流动载体的苯酚支撑液膜传输行为;用液-液萃取法测定了N-503/煤油体系中苯酚萃合物组成为1∶1,及在相应的条件下萃取常数Ke′x为53.7;考察了料液相的pH值、载体浓度、实验温度、起始浓度以及解析相NaOH的浓度对苯酚传输的影响,并对该体系分离、传输苯酚的最佳条件进行了讨论;从界面化学和扩散传质角度提出了苯酚的传输动力学方程,采用直线斜率法对苯酚在N-503/煤油支撑液膜体系中的扩散层厚度和膜内扩散系数进行了测定,取得满意结果。
Transport and separation of phenol from HAc-NaAc（pH=3.6） feed solution into a stripping solution （0. 4 mol/L NaOH） through a supported liquid membrane （SLM） consisting of N, N＇-di （1- methyl-pentyl）acetamide （N-503） in kerosene, supported on the microporous polypropylene film, have been studied in this paper. The stoichiometry of the extracted species of phenol with N-503 in kerosene has been determined by liquid-liquid extraction,and the following results were obtained： Ph^- -q- RH^＋ = Ph^-. RH^＋, K＇ex= 53. 7. The effects of pH value in feed solution, concentration of N-503 in the membrane,experimental temperature and phenol initial concentration in the feed on the transport rate of phenol, have also been investigated. The transport kinetic equation has been derived in terms of the law of mass diffusion and the interface chemistry. Various parameters, such as permeability coefficient（P）, thickness of aqueous diffusion layer （δn）,and diffusion coefficient（d0 ） of phenol through SLM, have been evaluated by the linear slope method, and the obtained results are δn = 3.49 × 10^-6 m, d0 = 2.74 × 10^-10 m^2/s, respectively. The transport kinetic equation has been demonstrated to be identical with the experimental results.
出处
《分析科学学报》
CAS
CSCD
2006年第2期129-132,共4页
Journal of Analytical Science
基金
陕西省自然科学基金(No.2000H15)
陕西省教育厅基金项目(No.02JK141)
关键词
支撑液膜
液膜分离
苯酚
N-503
Supported liquid membrane
Liquid membrane separation
Phenol
N-503
