An Approach for the Recovery of Perfluorinated Membranes
Paper ID : 1400-MST2015-FULL
1Elham Karimi *, 2Maryam Eivazkhani
Ion exchange membranes were first developed for electrodialysis application. One of the most important applications of this type of membrane is industrials electrolysis process such as chlor-alkali. The chlor-alkali industry’s development of ion-exchange membrane-based electrolytic cells in the early 1970s was driven by environmental concerns.1 The chlor-alkali is an industrial process used for synthesis of chlorine and sodium hydroxide from electrolysis of brine. Although the perflourinated membranes are expensive but these membranes are the best for this process due to higher yields products and lower electrical energy2 using during the process. According to above, recovery of this type of membrane is desired so a process for making a liquid composition of a perfluorinated polymer having sulfonic groups in liquid medium by dimethyl sulfoxide and ethanol/propanol mixture, has been developed. The membrane solution and recasted membrane has been characterized by ATR, DLS and performance tests in laboratory electrolysis set-up. The obtained results from recovered and commercial membranes were compared an performance tests consists of cell voltage and chlorine/caustic efficiency showed that the affection of recovery process on mentioned membrane was negligible.

1. S. C. Savett, J. R. Atkins, C. R. Sides, J. L. Harris, B. H. Thomas, S. E. Creager, W. T. Pennington, D. D. DesMarteau, J. Electrochem. Soc. 2002, 149, A1527.
2. S. Kuwabata, K. Mitsui, H. Yonemaya, J. Electroanal. Chem. 1990, 281, 97; (b) M. A. Hofmann, C. M. Ambler, A. E. Maher, E. Chalkova, X. Y. Zhou, S. N. Lvov, H. R. Allcock, Macromolecules 2002, 35, 6490.
Chlor-Alkali, Perfluorinated Membranes, environmental concerns
Status : Paper Accepted (Oral Presentation)