Modeling study on the mass transfer of hollow fiber renewal liquid membrane: Effect of the hollow fiber module scale
Modeling study on the mass transfer of hollow fiber renewal liquid membrane: Effect of the hollow fiber module scale
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DOI：
10.1016/j.memsci.2013.03.030
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发表时间：
2013-07
影响因子：
9.5
通讯作者：
Zhongqi Ren;Yanqiang Yang;Weidong Zhang;Junteng Liu;Houli Wang
中科院分区：
文献类型：
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作者：
Zhongqi Ren;Yanqiang Yang;Weidong Zhang;Junteng Liu;Houli Wang
从实验和理论上研究了中空纤维组件尺度对中空纤维更新液膜技术传质性能的影响。采用5种相同堆积密度和有效长度的聚丙烯中空纤维膜组件进行了实验研究。以CuSO4水溶液为进料相，LIX984N在煤油中的有机溶液为液膜相，以硫酸为反萃相。用停留时间分布曲线描述了中空纤维组件壳侧的非理想流动状态，并用Peclet数对其进行了定量表征。在中空纤维模组中，Peclet数随L/d的增加而增加，在L/d为20时达到最大值，然后下降。在中空纤维更新液膜工艺中，在单程、循环和串级操作模式下，总传质系数与壳侧的Peclet数成正比。提出了一个新的传质关联式，用Peclet数来定量描述中空纤维组件壳侧的非理想流动。建立了相应的中空纤维更新液膜过程的数学模型，计算结果与实验数据吻合较好。
The effect of hollow fiber module scale on the mass transfer performance of hollow fiber renewal liquid membrane technique is studied experimentally and theoretically. Five scales of polypropylene hollow fiber membrane modules with same packing density and effective length are used for experiments. CuSO4aqueous solution is used as feed phase, the organic solution of LIX984N in kerosene is used as liquid membrane phase, and H2SO4is used as the stripping phase. The non-ideal flow status on the shell-side of the hollow fiber module is described by residence time distribution curves and quantitatively characterized by the Peclet number. Peclet number increases with the increase of L/d in hollow fiber module, and reaches its maximum value when L/d is 20, then decreases. The overall mass transfer coefficient is directly proportional to the Peclet number on the shell side in single-pass, recycling and cascade operation modes in the hollow fiber renewal liquid membrane process. A new mass transfer correlation is proposed to quantitatively describe the non-ideal flow on the shell-side of the hollow fiber module with Peclet number. Then, the corresponding mathematical model for hollow fiber renewal liquid membrane process is developed and the calculated results show good agreement with the experimental data.