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paul9979金虫 (小有名气)
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| Both the geopolymer circular plate membrane and the self-supporting NaA zeolite membrane were tested for pervaporation (PV) during the dehydration of alcohol and desalination of seawater. The preliminary measurements of the pervaporation during the dehydration of alcohol were reported in our previous work [16]. This study primarily investigated the pervaporation during the desalination of NaCl solutions (all feed with NaCl concentration of 3.5 wt%). In particular, the pervaporation characteristics with different PV temperatures and membrane thicknesses were evaluated using pervaporative NaCl solutions and pure water with a lab-designed and lab-assembled pervaporation test apparatus [1, 15]. The self-supporting NaA zeolite membranes (thickness = 9.4 mm) were tested for PV at 25, 40, 70, and 90ºC using pure water and NaCl solutions. One batch of pure water or NaCl solutions was applied to the PV tests. The flux of the NaCl solutions (0.42 kg m-2 h-1 at 25ºC) gradually increased to 3.86 kg m-2 h-1 as the PV temperature increased to 90ºC. The data shown in Fig. 5 clearly indicate that the flux of the NaCl solutions was larger than that of pure water at PV temperatures lower than 90ºC. The theory is based on the fact that the apparent activation energy of the water permeation in the NaCl solutions decreased with increasing PV temperature and was always less than that of the pure water [1]. |
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baoshanqiu
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爱与雨下: 金币+1 2015-06-17 07:23:53
paul9979: 金币+28, 翻译EPI+1, ★★★★★最佳答案 2015-06-17 22:01:23
爱与雨下: 金币+1 2015-06-17 07:23:53
paul9979: 金币+28, 翻译EPI+1, ★★★★★最佳答案 2015-06-17 22:01:23
| 地质聚合物圆盘膜和自身支持的NaA沸石膜均被试用于酒精脱水和海水脱盐的全蒸发（PV)过程。我们前面的工作[16]报告了测量酒精脱水的全蒸发的初步结果。这里主要研究NaCl溶液（所有都加NaCl浓度为3.5 wt%)脱盐的全蒸发。具体说，是用实验室设计、安装的全蒸发测试装置[1,15]评价不同PV温度和膜厚度下全蒸性的NaCl溶液和纯水的全蒸发特性。采用NaCl溶液和纯水测试了25、40、70和90摄氏度下用自身支持NaA沸石膜（厚度=9.4mm)作PV。用同一批纯水或NaCl溶液作PV测试。当PV温度由25摄氏度增加到90摄氏度时，NaCl溶液的流量由0.42kg/平方米/小时逐渐增加到3.86kg/平方米/小时.图5的数据清楚地表明在PV温度低于90摄氏度时NaCl溶液的流量大于纯水的流量。其理论基础是随PV温度增加NaCl溶液中水透过的表观活化能降低且总低于纯水的表观活化能。 |
2楼2015-06-17 04:35:59
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