Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
622741 | Desalination | 2016 | 12 Pages |
Abstract
Isotactic polypropylene (iPP)/ethylene vinyl acetate (EVA) co-blending hydrophobic microporous membranes for vacuum membrane distillation (VMD) were prepared via thermally induced phase separation (TIPS), and the membranes were supported by a nonwoven polyester fabric with special cellular structures. These special cellular structures consist of two parts: a thin dense cellular layer and a thick loose cellular layer. These structures markedly decreased the resistance of mass transfer and improved flux performance during VMD. The co-blending membranes used for VMD led to superior long-term stability and excellent durability relative to neat PP membranes. This result can be attributed to the addition of EVA that significantly reduced membrane crystallinity. The thickness of the dense cellular layer and voids of the loose cellular layer showed a minimum and a maximum at a PP/EVA co-blending ratio of 6:1, respectively. Aqueous NaCl solutions (0.5 mol/L) were used in the VMD experiment at a feed temperature of 70 °C and a permeate side absolute pressure of 3 kPa. The flux of the iPP/EVA co-blending membranes was 27.6 kg/(m2 h) within 36 h of continuous operation, whereas that of the iPP membranes was only approximately 16 kg/(m2 h) within 6 h of continuous operation under the same condition.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Na Tang, Chunlei Feng, Huaiyuan Han, Xinxin Hua, Lei Zhang, Jun Xiang, Penggao Cheng, Wei Du, Xuekui Wang,