中空纤维更新液膜传质性能的研究

Mass Transfer Characteristics of Hollow Fiber Renewal Liquid Membrane

研究了中空纤维更新液膜(HFRLM)技术的传质性能。以CuCl2水溶液-10%P204+煤油-盐酸为实验体系,研究结果表明,中空纤维更新液膜技术可以实现同级萃取-反萃,且总传质系数随料液相流速的增大而增大,在实验条件下,总传质系数受反萃相流速的影响较小。实验研究探讨了混合方式(料液与萃取剂混合和反萃剂与萃取剂混合)和体系分配系数对传质性能的影响。实验结果表明,由于相间分配系数的不同,总传质系数受混合方式的影响较大,以分配系数较大的一相与萃取相混合流经管程的方式对传质过程有利。

The mass transfer performance of hollow fiber renewal liquid membrane （HFRLM） technique was studied. The CuCl2 aqueous solution-10%P204 ＋ kerosene-HCl were selected as the experimental system. It is shown that the extraction and stripping process could be carried out in the same stage by the HFRLM technique. The overall mass transfer coefficient increases with increasing the feed flow rate, however, under the experimental conditions, the strip phase flow rate has only small effect on the mass transfer. The influences of the mixing mode and the distribution coefficient of the system on the mass transfer of HFRLM were investigated. Results show that, since the distribution coefficient between the phases are different, it causes the mixing mode has a bigger influence on the overall mass transfer, and it will advantage the mass transfer process of the HFRLM if let the phase with larger distribution coefficient mix with the extraction phase and flow with it together through the tube side.