Ion exchange
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Transcript of Ion exchange
ION EXCHANGEAnup Ghimire
Rock Face Limited
The ProcessO It is a process of exchange of ions
between the insoluble resin and the
solution.
The Process
O R-H + A+ < -- > R-A +H+
O R is the insoluble matrix of the ion
exchange resin.
O R-H is cation exchanger.
O H+ replaces every A+ ions in the
exchange process and electron
neutrality is maintained.
Ion Exchange
O Ion exchange is a natural process
occurring in tissues of plants and
animals, soils and minerals.
O Assists to remove the cations and
anions present in the water solution.
Applications
OThe treatment of radioactive
and non-radioactive chemical
species.
…applications
OSoftening, de alkalization,
demineralization, nitrate
removal, condensate polishing.
and pollution control.
Effect of Ions
O Heating systems, steam generation and
manufacturing process are affected by
the presence of ion concentration in
water particularly cations such as
calcium, magnesium, sodium and
potassium and anions such as sulphate,
chloride, nitrate and silica.
Ion Exchangers
OStrongly acidic
OStrongly basic
OWeakly acidic
OWeakly basic
…Ion exchangers
Naturally occurring and synthetic
O Inorganic ion exchangers have greater
selectivity and better disposal options
than organic resin
O organic ion exchangers are reliable
and efficient in water coolant systems
…ion exchangers
O Mineral compounds such as
bentonite, Kaolinite and Illite and
Zeolites such as analcite,
chabazite, sodalite and
clinoptilolite are naturally occurring
inorganic ion exchangers.
…ion exchangers
O Polysaccharides such as cellulose,
algic acid, straw and peat, proteins
such as casein, keratin and collagen
and carbonaceous materials such as
charcoals, liquites and coals are
naturally occurring organic ion
exchangers.
…ion exchangersO Zeolites, Titanates and silico-
titanates, transition metal
hexacyanoferrates are inorganic
synthetic ion exchangers.