• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Removal of 1,1,1-trichloroethane from water using a polyvinylidene fluoride hollow fiber membrane module: Vacuum membrane distillation operation
【24h】

Removal of 1,1,1-trichloroethane from water using a polyvinylidene fluoride hollow fiber membrane module: Vacuum membrane distillation operation

机译：使用聚偏二氟乙烯中空纤维膜组件从水中去除1,1,1-三氯乙烷：真空膜蒸馏操作

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Polyvinylidene fluoride (PVDF) hollow fiber membranes with an asymmetric structure have been prepared by the phase inversion method using dimethylacetamide (DMAc) as solvent and LiCl-H_2O as additives and applied for volatile organic compounds (VOCs) removal from water.The membrane was characterized using scanning electron microscopy (SEM) for observing its microstructures and a gas permeation method for measuring its porosity,pore size and pore size distribution.The results have provided the conditions for tailor-made hollow fiber membranes with the desired morphology suitable for vacuum membrane distillation (VMD).Moreover,the structural parameters such as mean pore size and effective porosity determined are being used as parameters in the mathematical modeling of the VMD process.A hollow fiber membrane module was then fabricated using a selected PVDF hollow fiber membranes and applied for removal of 1,1,1-trichloroethane (TCA) from water.The effects of various operating parameters including downstream vacuum level,feed temperature,feed flow rate and TCA feed concentration on the performance of the module were investigated both theoretically and experimentally.A high feed temperature and/or a low downstream pressure favored the enhancement of TCA removal,but also yielded dramatically a high water permeation flux,resulting in an excessive dilution of the permeated VOC.Under optimal operating conditions,particularly the downstream vacuum level,feed temperature and feed flow rate,TCA removal efficiency up to 97% was achievable.A mathematical model,which takes into consideration of mass transfer resistances in both liquid and membrane phases,predicts well the TCA removal data in comparison with the experimentally observed results under the favorable operation ranges employed in vacuum membrane distillation.
机译：以二甲基乙酰胺（DMAc）为溶剂，LiCl-H_2O为助剂，通过相转化法制备了不对称结构的聚偏氟乙烯（PVDF）中空纤维膜，并用于去除水中的挥发性有机化合物（VOC）。使用扫描电子显微镜（SEM）观察其微观结构和气体渗透法测量其孔隙率，孔径和孔径分布，结果为定制的中空纤维膜提供了条件，使其具有适合真空膜蒸馏的所需形态（VMD）。此外，确定的平均孔径和有效孔隙率等结构参数被用作VMD过程数学建模的参数。然后，使用选定的PVDF中空纤维膜制造中空纤维膜组件，并将其应用于从水中去除1,1,1-三氯乙烷（TCA）。各种操作参数的影响从理论上和实验上研究了下游真空度，进料温度，进料流速和三氯乙酸进料浓度对组件性能的影响。高进料温度和/或低下游压力有利于三氯乙酸的去除，但收率也很高。在最佳操作条件下，特别是在下游真空度，进料温度和进料流速下，可实现高达97％的TCA去除效率。考虑到液相和膜相中的传质阻力，与在真空膜蒸馏中使用的有利操作范围内的实验观察到的结果相比，可以很好地预测TCA去除数据。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号