• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >CO2 absorption by using PVDF hollow fiber membrane contactors with various membrane structures
【24h】

CO2 absorption by using PVDF hollow fiber membrane contactors with various membrane structures

机译：使用具有各种膜结构的PVDF中空纤维膜接触器吸收CO2

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

Seven kinds of asymmetric poly(vinylidene fluoride) (PVDF) hollow fiber membranes with considerable different structures at the outer surfaces were prepared via thermally induced phase separation (TIPS) method and applied for CO2 absorption as gas-liquid membrane contactors. A commercial micro-porous poly(tetrafluoroethylene) (PTFE) hollow fiber membrane was also used as a highly hydrophobic membrane. Experiments on the absorption of pure CO2 into monoethanolamine (MEA) solutions were performed and the effects of membrane structure and inner diameter on the membrane performance were investigated. The module efficiencies were compared for the two patterns of operation, i.e. case 1 operation where liquid flows in the tube side while gas in the shell side and case 2 operation where liquid flows in the shell side while gas in the tube side. CO2 absorption fluxes observed in case 1 operation were inversely proportional to the inner diameter of the hollow fiber membrane, and CO2 absorption rate per fiber was almost the same for all membranes. CO2 absorption rates observed in case 2 operation were much smaller than those in case 1 operations. The performances of the PVDF membranes were comparable with that of the commercial PTFE membrane.A mathematical model for pure CO2 absorption in a membrane contactor, which assumes that the membrane resistance is negligibly small and the total membrane area is effective for gas absorption, was proposed to simulate CO2 absorption rates. Experimental results in case 1 operation were satisfactorily simulated by the model for all membranes with different structures. Experimental results obtained in case 2 operation were also simulated by the model except for a membrane with a very low surface porosity on its outer surface. CO2 absorption flux increased with increasing the MEA concentration up to the concentration of 2 mol/dm~3, however, the CO2 absorption flux hardly increased with further increase in MEA concentration. This behavior is discussed based on the decrease in the effective gas-liquid contacting area with increasing MEA concentration. A method to estimate CO2 solubility and diffusivity in MEA solutions, which are essential for calculating CO2 absorption flux by the model, is also described.
机译：通过热诱导相分离（TIPS）方法制备了七种在外表面具有明显不同结构的不对称聚偏二氟乙烯（PVDF）中空纤维膜，并将其作为气液膜接触器吸收CO2。市售的微孔聚四氟乙烯（PTFE）中空纤维膜也被用作高疏水性膜。进行了将纯CO2吸收到单乙醇胺（MEA）溶液中的实验，并研究了膜结构和内径对膜性能的影响。比较了两种操作模式的模块效率，即情况1的操作是液体在管侧流动而气体在壳体侧，而案例2的操作是液体在壳体在管侧流动而气体在管侧。在情况1的操作中观察到的CO2吸收通量与中空纤维膜的内径成反比，并且所有膜的每根纤维的CO2吸收率几乎相同。在情况2的操作中观察到的CO2吸收率比情况1的操作小得多。 PVDF膜的性能可与商用PTFE膜相媲美。提出了膜接触器中纯CO2吸收的数学模型，该模型假定膜电阻很小，总膜面积对气体吸收有效。模拟二氧化碳吸收率。该模型对所有具有不同结构的膜均令人满意地模拟了第一种情况下的实验结果。该模型还模拟了在案例2的操作中获得的实验结果，但其外表面的孔隙率非常低的膜除外。随着MEA浓度的增加，CO2的吸收通量增加，直至浓度达到2 mol / dm〜3，但是随着MEA浓度的增加，CO2的吸收通量几乎没有增加。基于MEA浓度增加时有效气液接触面积的减少来讨论此行为。还描述了一种估算MEA溶液中CO2溶解度和扩散率的方法，这对于通过模型计算CO2吸收通量至关重要。

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