UNSTIRRED DEAD-END ULTRAFILTRATION - A METHOD TO DETERMINE DIFFUSION-COEFFICIENT OR OSMOTIC-PRESSURE FOR NONCHARGED MACROMOLECULAR SOLUTIONS

被引：8

作者：

NICOLAS, S

BOULANOUAR, I

BARIOU, B

机构：

[1] Laboratoire des Procédés de Séparation, Université de Rennes I, U.A. INRA, 35014 Rennes Cédex, rue du Clos Courtel

来源：

JOURNAL OF MEMBRANE SCIENCE | 1995年 / 103卷 / 1-2期

关键词：

MUTUAL DIFFUSION COEFFICIENTS; OSMOTIC PRESSURE; DEAD-END ULTRAFILTRATION; POLARIZATION CONCENTRATION; THEORY;

D O I：

10.1016/0376-7388(94)00301-E

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Concentration polarization phenomenon in ultrafiltration or reverse osmosis processes is governed by a non linear convective-diffusion equation. General unsteady state equations associated with the osmotic theory relationship are solved numerically. Unstirred ultrafiltration flux declines are accurately described when the concentration dependence of the osmotic pressure or diffusion coefficients are known. Inversely, when the experimental evolution of the permeate flux is introduced in the calculation, it is possible to determine osmotic pressure or diffusion coefficients as a function of solute concentration with a good precision. The results obtained for four different kinds of well-defined non charged polymers agreed well with available literature data.

引用

页码：19 / 30

页数：12

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