Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 563, Issue -, Pages 460-469Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.06.006
Keywords
Zeolite membrane; Hollow fiber; Membrane module; Pervaporation; Dehydration
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Funding
- National Natural Science Foundation of China [21490585, 21776128]
- National High-tech R&D Program of China [2015AA03A602]
- Six Top Talents of Jiangsu Province, State Key Laboratory of Materials-Oriented Chemical Engineering [ZK201602]
- 333 Talent Project of Jiangsu Province, State Key Laboratory of Materials-Oriented Chemical Engineering [ZK201602]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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T-type zeolite membranes were prepared on four-channel alpha-Al2O3 hollow fibers by secondary growth method with an ensemble synthesis strategy. Prior to the membrane synthesis, a bundle of alpha-Al2O3 hollow fibers were assembled on the ceramic bases by enamel sealing. The membrane modules with membrane areas of 0.03 m(2) and 0.54 m(2) were then seeded with ball-milled T-type zeolite crystals by dip-coating. A uniform and continuous T-type zeolite seed layer was obtained for a seed concentration of 1.5 wt% and a coating time of 15 s. The seeded modules were then immersed in synthesis solution for ensemble hydrothermal crystallization. After optimizing the synthesis parameters, high-quality hollow fiber zeolite membrane modules could be prepared with good reproducibility. The membrane module with 0.03 m(2) exhibited a water permeation flux of 2.25 kg m(-2) h(-1) and a separation factor of 1348 for PV dehydration of 90 wt% ethanol/water mixture at 348 K. The membrane modules had long-term stability in acidic solution (pH similar to 3) for 450 h as well. A pilot-scale apparatus composed of two 0.54 m(2) membrane modules connected in series was further constructed for PV dehydration of 90 wt% isopropanol/water. The ensemble synthesis strategy paves a way for the industrialization of hollow fiber T-type zeolite membranes.
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