Optical Polarizing Studies of Cellulose Acetate Membranes Prepared by Phase-Inversion

1995 ◽  
Vol 258 (1) ◽  
pp. 163-171 ◽  
Author(s):  
M. J. Rosa ◽  
M. N. De Pinho ◽  
M. H. Godinho ◽  
A. F. Martins
Keyword(s):  
Cellulose Acetate ◽  
Phase Inversion ◽  
Cellulose Acetate Membranes

scholarly journals ASYMMETRIC CELLULOSE ACETATE MEMBRANES USED IN SEPARATION APPLICATIONS

2021 ◽  
Vol 185 (1) ◽  
pp. 70-76
Author(s):  
Gabriela CIOBANU ◽  
Lidia FAVIER ◽  
Maria HARJA
Keyword(s):  
Cellulose Acetate ◽  
Phase Inversion ◽  
Preparation Method ◽  
Nacl Solution ◽  
Inversion Process ◽  
Asymmetric Membranes ◽  
Membrane Performance ◽  
Cellulose Acetate Membranes ◽  
Phase Inversion Process ◽  
Good Retention

This work focused on the use of cellulose acetate polymer for the preparation of porous asymmetric membranes using a phase inversion process. These membranes were characterised by scanning electron microscopy, a bubble-point method and sorption measurements. The preparation method used induced membrane anisotropy. The capacity of the membranes in the removal of electrolyte (NaCl) from aqueous solution was investigated. A good retention of 58.6% and a high flux rate of 8.9 × 10–4 m/s using NaCl solution of 200 mg/L concentration were obtained by cellulose acetate membranes prepared with water as non-solvent. The results showed that the membrane performance was affected by the membrane structure, which was determined by the conditions of membrane preparation.

Dialysis experiments with asymmetric cellulose acetate membranes

1988 ◽  
Vol 53 (6) ◽  
pp. 1247-1259
Author(s):  
Hans-Hartmut Schwarz ◽  
Jaromír Lukáš ◽  
Jiří Vacík
Keyword(s):  
Cellulose Acetate ◽  
Cross Section ◽  
Membrane Structure ◽  
Phase Inversion ◽  
Solution Concentration ◽  
Diffusion Permeability ◽  
Asymmetric Structure ◽  
Cellulose Acetate Membranes ◽  
The Asymmetry ◽  
Dialysis Time

Cellulose acetate membranes for ultrafiltration produced by phase inversion have an asymmetric structure in the cross-section. In spite of this assymetry it is possible to characterize such membranes by dialysis. The asymmetry has no influence on the permeability for solute poly(oxyethylene). The membrane structure was varied systematically by annealing. The influence of solution concentration, dialysis time and temperature was also investigated. Statements are made on the annealing influence. A relationship between diffusion permeability and the true rejection is discussed.

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