螺旋状中空纤维膜萃取传质特性

在对中空纤维膜萃取以及螺旋管技术进行充分调研的基础上 ,选择水 -苯酚 - 30 %TBP煤油为实验体系 ,溶质由水相萃取到有机相 ,在不同结构的单束螺旋状中空纤维膜器中研究了螺旋管纤维膜管内外流速以及螺旋管结构等因素对传质系数的影响 .实验结果表明 ,螺旋管中空纤维膜可以有效地提高中空纤维膜的传质特性 .随着管内流速的增加 ,传质系数将有很大提高 ,而管外流速对于传质系数的影响则较小 .至于螺旋结构的影响为 :随着螺旋内径的减小或者是螺旋螺距的减小 ,总传质系数相应地有很大提高 .最后得到了在本实验条件下计算总传质系数K的关联式

MASS TRANSFER CHARACTERISTICS IN COILED HOLLOW-FIBRE MEMBRANE EXTRACTION

Based on membrane extraction and helical tube technique, the mass transfer performance of some membrane modules with a different helically wound hollow-fibre was studied with the system of 30%TBP (in kerosene)-water and phenol as the solute. The effects of two phase flow rates, geometry of the membranes on mass transfer coefficients were investigated. The experimental results show that the helically wound hollow-fibre membrane makes much better performance in mass transfer. With an increase in the velocity of the aqueous phase in the tube, the overall mass transfer coefficients increase very quickly. The overall mass transfer coefficients have some relationship with the configuration parameters. When the pitch and inner diameter of the coiled membrane is decreased, the mass transfer coefficients will be increased. The overall mass transfer coefficients can be predicted with an equation.