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작성일 : 11-10-28 12:10
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이온교환수지 개발 역사 (영문)
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최고관리자
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Development and History of Ion Exchange
Two Englishmen, Thompson and Way, first recognized the process of ion exchange in
1850. They reported that when a fertilizer solution was poured over a column of soil,
ammonia in the fertilizer solution was replaced by calcium from the soil. Ion
exchange was not used for any industrial application until 1905. At that time, a
German chemist, Gans, used a synthetic sodium aluminosilicate cation exchange
material called zeolite in water softeners. Gans’ water softeners exchanged sodium
ions in the zeolite for both the calcium and magnesium ions in the water, softening
water by removing these hardness ions.
A naturally occurring zeolite called greensand later replaced synthetic aluminosilicate
for use in softeners. Greensand has greater physical strength than aluminosilicate,
which made it more suitable for industrial applications.
In 1944, strong acid cation (SAC) exchange resin was produced by copolymerization
of styrene and divinylbenzene. The styrene-divinylbenzene (S-DVB) copolymer is
very stable and has more capacity for ion exchange than greensand. A styrenedivinylbenzene
strong base anion (SBA) exchange resin was developed in 1948. It
was capable of removing all anions, including silicic and carbonic acids (silica and
carbon dioxide in water, respectively). Many modifications have been made to the
copolymer structure of the original SAC and SBA styrene-divinylbenzene ion
exchange resins since 1948. These modifications have been made in an attempt to
meet specific industrial needs and to provide increased resin life.
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