Flemion® membrane

Nakao, M., Shimohira, T. Takechi, Y. (1998) High performance operation with Flemion membranes and the AZEC-B1 electrolyser. In Modem Chlor-Alkali Technology, Vol. 7 (ed. S. Sealey), pp. 95-104. Society of Chemical Industry, London and Royal Society of Chemistry, Cambridge. 

Sajima, Y., Nakao, M., Shimohira, T. Miyake, H. (1992) Advances in flemion membranes for chlor-alkali production. In Modern Chlor-alkali Technology (ed. T.C. Wellington), Vol. 5, pp. 159-175. Hays Chemical Distribution Ltd., Sandbach, UK. 

Advanced Cell Technology with Flemion Membranes and the AZEC Bipolar Electrolyser... 

Later, Hinatsu et al. studied the uptake of water, from the liquid and vapor states at various temperatures, in acid form Nafion 117 and 125, and Aciplex and Flemion membranes, although the latter two similar products will not be discussed here. These studies were motivated by a concern over the deleterious effects, involving either overly dry or overly wet membranes, on electrical conductivity within the context of polymer electrolyte fuel cells and polymer electrolyte water electrolyzers. 

Other perfluorinated cation exchange membrane materials have also been produced for chlor-alkali cell and other applications. These are the Flemion membrane products (Asahi Glass Co. 

Asahi Glass Co., has announced the improvement of its Flemion membrane, Flemion 723, which reduces electrolysis power from 2500 to 2300 KWH/M Ton NaOH, operating at 35% NaOH and 2.0 KA/M current density. Cell voltage is 3.23 volts at 2 KA/M with 94% current efficiency (75). 

Asahi Glass, "The Flemion Membrane Chlor-Alkali Process,"... 

Electrolysis Technology with Flemion Membrane" Kyoto Symposium of Japanese Soda Industrial Association, 1980. 

The Flemion membrane was applied for the use in the electrolysis of sodium chloride solution. In Fig. 20, electrolytic performance of the membranes having different ion exchange capacity (AR, meq/g) of 1.44 and 1.23 are shown against the concentration of caustic soda produced in the cathod chamber. 

Figure 21 depicts trends in the variation of cell voltage with interelectrode distance (obtained with Flemion membranes). 

Perfluorinated membranes (Dow membrane) were developed by Dow Chemical Co. (USA). Their equivalent masses are equal to 800-850 g, while dry state thickness is of 5 tm. Flemion membranes with equivalent masses of 1000 were developed by Asahi Glass Co. (Japan) [5]. Aciplex-S membranes were developed by Asahi Chemical Industry (Japan) and possess equivalent masses of 1000-1200 g. 

H. Miyake, The Design and Development of Flemion Membranes. In T.C. Wellington (ed.) Modem Chlor-Alkali Technology, Vol. 5, Elsevier Af lied Science, London (1992), p. 59. 

N. Nakao, T. Shimohira, and Y. Takechi, High Performance Operation with Flemion Membranes and the AZEC Electrolyzer. In S. Sealey (ed.). Modem Chlor-Alkali Technology, Vol. 7, Royal Society Chemistry, Cambridge (1998). 

Yoshida, N., Ishisaki, T., Watakabe, A., and Yoshitake, M. 1998. Characterization of Flemion membranes for PEFC. Electrochimica Acta 43 3749-3754. 

H. Miyake, Asahi Gla.ss Co. Ltd The design and development of Flemion membranes. Modem Chlor-Alkali Technology, vol. 5, Elsevier Appl. Science, Barking, 1992, pp. 59-68. 

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