FLUX DECAY AND REJECTION DURING MICRO-FILTRATION AND ULTRA-FILTRATION OF HYDROPHOBICALLY-MODIFIED WATER-SOLUBLE POLYMERS

被引:17
作者
WAKEMAN, RJ
AKAY, G
机构
[1] Separation Processes Centre, University of Exeter, Exeter
关键词
MICROFILTRATION; ULTRAFILTRATION; POLYMER; FOULING; REJECTION;
D O I
10.1016/0376-7388(94)00017-4
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Crossflow filtration of anionic and cationic hydrophobically modified water-soluble polymers was studied using polyether sulphone membranes with varying pore sizes. New data on the permeate flux rates and rejections of these polymer solutions are presented. It was found that the pseudo-gel polarisation concentration increases with increasing polymer solubility. The steady state permeate flux decays linearly with log (MWCO). A minimum molecular weight cut off (MMWCO) can be identified by extrapolating the steady state permeate flux to zero. The MMWCO is well below the molecular weight cut off (MWCO) based on the random coil size of the macromolecule. It is shown that the MMWCO should be based on the size of the small axis of the rod-like extended molecule, which can orientate in the flow field during passage through the pores. This model also explains why the polymer rejection increases with increasing permeate flux.
引用
收藏
页码:145 / 152
页数:8
相关论文
共 20 条
[1]   LIMITING FLUX IN MEMBRANE SEPARATIONS - A MODEL BASED ON THE VISCOSITY DEPENDENCY OF THE MASS-TRANSFER COEFFICIENT [J].
AIMAR, P ;
FIELD, R .
CHEMICAL ENGINEERING SCIENCE, 1992, 47 (03) :579-586
[2]  
AKAY G, 1993, CHEM ENG RES DES, V71, P411
[3]   CROSS-FLOW MICROFILTRATION BEHAVIOR OF A DOUBLE-CHAIN CATIONIC SURFACTANT DISPERSION IN WATER .1. THE EFFECT OF PROCESS AND MEMBRANE-CHARACTERISTICS ON PERMEATE FLUX AND SURFACTANT REJECTION [J].
AKAY, G ;
WAKEMAN, RJ .
CHEMICAL ENGINEERING SCIENCE, 1994, 49 (02) :271-283
[4]   MECHANISMS OF PERMEATE FLUX DECAY, SOLUTE REJECTION AND CONCENTRATION POLARIZATION IN CROSS-FLOW FILTRATION OF A DOUBLE-CHAIN IONIC SURFACTANT DISPERSION [J].
AKAY, G ;
WAKEMAN, RJ .
JOURNAL OF MEMBRANE SCIENCE, 1994, 88 (2-3) :177-195
[5]  
AKAY G, 1993, Patent No. 3085219
[6]  
AKAY G, 1982, POLYM ENG SCI, V22, P789
[7]  
AKAY G, UNPUB CHEM ENG SCI
[8]   COIL-STRETCH TRANSITION OF DILUTE FLEXIBLE POLYMERS UNDER ULTRAHIGH VELOCITY-GRADIENTS [J].
DEGENNES, PG .
JOURNAL OF CHEMICAL PHYSICS, 1974, 60 (12) :5030-5042
[9]  
HEINLE SA, 1986, ACS SYM SER, V213, P183
[10]  
Keller A., 1987, PROG COLLOID POLYM S, V75, P179