A New Technique for the Determination of Overall Mass‐transfer Coefficients in Continuous Dialyzers

Abstract

A mass transfer model has been developed to describe the dialysis of solutes in continuous dialyzers. The model is based on recycle system. and yields a new technique for the calculation of overall mass-transfer coefficients. The permeability of a Cuprophane PT-150 membrane to NaCl solutions was determined. Shenvood numbers describing mass-transfer resistance in the fluid adjacent to the membrane were determined, and presented as a function of the corresponding Reynolds and Schmidt numbers.

Separation of HCl+NiCl2Mixture by Diffusion Dialysis

“…8. As the transport characteristics of the solution/membrane system are usually referred to the initial acid concentration in compartment I, we modified the procedure given above in such a way that the objective function (16) was considered a function of the coefficients a 0 , a 1 and a 2 of the polynomial (17) used for the approximation of the dependence P A ¼ f(c A0 I ). For that purpose, the experimental data at n I ¼ n II ¼ 9.17 and 13.67 s 21 were used.…”

“…Diffusion dialysis provided acid removal of 56-67% with high retention of ferric ions-up to 98-99%. Besides the investigation of the separation of multicomponent mixtures (ternary and quarternary) by diffusion dialysis as mentioned above, much attention has been paid to the study and the modelling of the dialysis of solutions with one component (12)(13)(14)(15)(16)(17)(18)(19)(20).…”