Technology
Toray opened up the
prospect for a reverse osmosis membrane used in seawater desalination that can
halve power consumption. The substantiative experiment starts this year. Toray’s
new product has the strong ability to eliminate ions from seawater with high
chemical resistance. Using new materials that interlock inorganic substances
and organic substances on the molecular level, the company uniformized the
holes on the membrane surface depending on the size of water molecule and
succeeded in avoiding clogging while preventing ions from permeating through
the membrane. The ion removal rate increased 10-20%, and it can effectively
permeate only water molecules. In addition, the new membrane is hard to damage because
inorganic substances in the new materials protect organic substances from the chlorine
chemical used to cleanse the membrane. Accordingly, it can reduce power consumption
by 50%. A small module has already been built, and the company is scheduled to
confirm the performance between 2012 and 2013.
Kubota also advanced
the water treatment membrane. Kubota’s new product doubles the amount of water
that it permeates. The company applied fluorinated resin in place of the
existing chlorinated polyethylene and successfully created a membrane that has
a shape to facilitate the permeation of water. Because the amount per membrane
doubles, the number of required membranes can be halved. Should it be applied
to a wastewater recycling plant, electricity used to recycle one ton of
wastewater will decrease 40% to 0.5 kW. The substantiative experiment starts
this year. Japanese companies including Toray, Kubota, Nitto Denko, and
Mitsubishi Rayon have a combined share of 60% in the world market. As the 21st
century is dubbed as a century of water, the competition in the world market of
water treatment membranes is intensifying.
Toray's membrane technology
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