Chemical Engineering November 2021 - 44

DC
eNaCl
Production
+
Hypochlorous
acid
water
HClO
Sterilization
Anion-exchange
membrane
PFSA membrane
FIGURE 5. A PFSA membrane can be used in a three-chamber electrolyzer for
hypochlorous acid and sodium hydroxide
and decreasing the thickness. Both the anode side and
cathode sides include a gas diffusion layer (GDL), as
shown in Figure 6.
While pursuing low electric resistance, other physical
properties, such as mechanical strength and dimensional
stability between the dry state and wet state, can
be in a trade-off relationship. Therefore, the membrane
design should involve optimizing the reinforcement and
balancing the thickness. This practice has been learned
through decades of previous and ongoing experience
in the chlor-alkali industry.
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44
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CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
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Kosuke Sumikura is the leader of the functional membrane development
group in the Research & Development Division of AGC Inc.'s
Chemicals company. He has been working on electrochemical and
inorganic process development at AGC for ten years. In addition, for
the past five years, he has been engaged in ion-exchange membrane
development. He earned his M.S. degree from Kobe University, majoring
in electrochemistry and inorganic chemistry.
Water
Catalyst layer (Pt powder)
GDL on cathode side
Membrane
FIGURE 6. PFSA membranes are increasingly finding application as a separator
in PEM water electrolysis units
Another emerging application area for ion-exchange
membranes is in redox flow batteries, which have been
attracting attention as large-scale power-storage devices
for renewable energy.
Perfluorinated ion-exchange membranes play an essential
role in transitioning the industry to more sustainable
operations, in this case, utilizing renewable
energy instead of fossil fuels, just as they have done
in the past by replacing asbestos and mercury in the
chlor-alkali industry.
■
Edited by Mary Page Bailey
References
1. Yamaki, Y., Sumikura, K., Nishio, T. and Umemura, K., Development of Next-generation
Fluorine-based Ion Exchange Membrane " Flemion " at AGC Asahi Glass, Membrane, Vol.
43 (1), pp. 27-30, February 2018.
2. Hayabe, S. , Kaneko, T. and Nishio, T., Latest Development Trends of Ion Exchange Membranes
in AGC, Abstracts of the 44th Electrolysis Technology Conference, 2020.
3. United Nations Industrial Development Organization (UNIDO),
Generator
lyzed Water
infectant and
Washing
technology_db/7524/.
Authors
Masahiro Ohkura currently is the business development manager
of Forblue S-Series membranes in the Forblue Business Division of
AGC Inc.'s Chemicals company (Email: masahiro.ohkura@agc.com;
Website: www.agc-chemicals.com). Prior to this role, he served in
research and development positions with AGC, where he has worked
since 2005. He received his master of engineering degree in polymer
chemistry and bachelor of engineering degree in industrial
chemistry from Kyoto University.
Shintaro Hayabe is a researcher in the Research & Development
Division of AGC Inc.'s Chemicals company, where he has worked
since 2017. He graduated from Keio University with a master's degree
in engineering. He has been working with ion-exchange membrane-related
materials for about four years. His responsibilities include
the development of new ion-exchange membrane technologies
and the evaluation of their actual performance.
Incorporated
with
Ion
Exchange
Water for Oils and Fats,
Membrane
for
ElectroDiswww.unido.or.jp/en/
Catalyst
layer (IrO2
)
-
Na+
ClDischarge
NaOH
water
NaOH
Degreasing
solution
Production
H2
Cathode
H+
Anode
O2
GDL on anode side
H2
O

http://www.unido.or.jp/en/technology_db/7524/ http://www.agc-chemicals.com http://WWW.CHEMENGONLINE.COM

Chemical Engineering November 2021

Table of Contents for the Digital Edition of Chemical Engineering November 2021