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Preparation and performance of bipolar membranes with liquid ion-exchange medium

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3 Author(s)
Su, Jing ; Department of Chemical Engineering, Tsinghua University, Beij ing 100084, China ; Yu, Lixin ; Hao, Jihua

The current density is rather low in solid bipolar membranes, because the water transfer r ate is relatively slow across solid bipolar membranes made of solid ion-exchange materials. This paper describes the use of pdymer solutions, such as phosphatic pdy(vinyl alcohd) sdution, poly(acrylic acid) solution and pdy(vinyl alcohol) solutions with dispersed cation/anion-exchange resin particles to prepare bipolar membranes. The 0.1 mol/L NaOH and the 0.05 mdlL H2S04 were used to test the performance of the bipolar membranes. For a fixed liquid layer thickness, both the current density and the selectivity ircrease with the concentration increase of a polyelectrolyte solution. The maximum current density measured in the experiment was 1497 A/m2 with a selectivity of 96.8%.

Published in:

Tsinghua Science and Technology  (Volume:8 ,  Issue: 6 )