Experimental and theoretical research on N-methyl-2-pyrrolidone concentration by vacuum membrane distillation using polypropylene hollow fiber membrane
详细信息 查看全文
- 作者：Feifei Shao ; Changqing Hao ; Lei Ni ; Yufeng Zhang ; Runhong Du ; Jianqiang Meng ; Zhen Liu ; Changfa Xiao
- 关键词：Vacuum membrane distillation ; Hydrophobic membrane ; Permeation flux ; Knudsen-viscous flow ; Wilson equation
- 刊名：Journal of Membrane Science
- 出版年：15 February, 2014
- 年：2014
- 卷：452
- 期：Complete
- 页码：157-164
- 全文大小：1187 K
文摘
In this work, N-methyl-2-pyrrolidone (NMP) aqueous solution was concentrated by means of vacuum membrane distillation (VMD) using polypropylene (PP) hollow fiber hydrophobic membrane. The effects of operating variables including feed concentration, feed temperature and vacuum degree on VMD performance were studied experimentally and theoretically. The results indicated that higher feed temperature and/or higher vacuum pressure could lead to an enhancement in H2O removal and no change in NMP rejection. The permeation flux of 9.5 L/m2 h and the rejection 98% can be achieved at the feed temperature of 80 掳C and vacuum degree of 0.09 MPa. Higher feed concentration leads to a decrease in H2O flux and an increase in NMP flux and NMP molar fraction in permeate side. It proved that the Knudsen-viscous flow diffusion dominated the mass transform of H2O/NMP vapor in our experiment condition. Furthermore, 鈥淒usty-Gas鈥?model was used to predict membrane properties and Wilson equation method was used for predicting 纬 of the NMP aqueous solution. The theoretical data fitted well with the experimental data in our experiment conditions.