ppt ion exchange

8/16/2019 ppt ion exchange

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ON EXCHANGEON EXCHANGE

AND D ALYS S

AND D ALYS S

THE REMOVAL OF IONS

FROM SOLUTION USING

RESINS


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RESIN PARTICLE AND BEADS

http://www.lplc.com/misc/ionexbg.htm


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Ion exchange of monovalent cations: (assume ψ = 1)

For most solutions γ A =γ B


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Ion exchange of mixed-valent cations: (assume ψ = 1)


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CROSSLINKING TO MAKE ION EXCHANGE RESINS


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Selectivity of Ion Exchange Resins

In Order of Decreasing Preference

Strong acid cation Strong base anion Barium IodideLead NitrateCalcium Bisulfite

Nickel ChlorideCadmium Cyanide

Copper BicarbonateZinc Hydroide

!agnesium "luoridePotassium #ulfate

$mmonia#odium

Hydrogen


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Chelating Cation %esin#electi&ities for !etal

!etal '!(Caa Hg)*+++++++++++++++++++++++++++ *,-..Cu)*+++++++++++++++++++++++++++ *,/..

Pb)*

+++++++++++++++++++++++++++ 0,*..Ni)* ++++++++++++++++++++++++++ 12Zn)*+++++++++++++++++++++++++++ 02Cd)*+++++++++++++++++++++++++++ 01

Co)*

+++++++ ++++++++++++++++++++ 3+2"e)*++++++++++++++++++++++++++++ 4+2!n)*++++++++++++++++++++++++++++ 0+*Ca)*++++++++++++++++++++++++++++ 0

#electi&ity coefficient for the metal o&ercalcium ions at a pH of 4


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Cost of Commercially Available

Resins

%esin Cost56(ft/7#trong acid cation++++++++++ 4180/.

9eak acid cation++++++++++++ 0*.803.#trong base anion+++++++++++ *0.8*2.9eak base anion+++++++++++++ *0.8*3.Chelating cation++++++++++++ /1.831.


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SMALL SCALE

ION EXCHANGE

COLUMNS


11/34SKID-LOADED SMALL SCALE ION EXCHANGE PLANT


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13/34LARGE-SCALE ION EXCHANGE COLUMNS


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POSITIONING OF

RESIN BEADS FOR

A MIXED BED JUST

AFTER BACKWASHING


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Improved N!r"!eRemov"# $rom

Dr%&%' W"!er

() Io% E*+,"%'e

Te.!%' "H)dr"/#+ Dev+e

$or Improved

Re'e%er"!o%


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IXC"#+TM

A po0er$/# +omp/!er pro'r"m

http://www.rohmhaas.com/


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High Performance Liquid

Chromatography (DEE and C!"#$


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America's really big sacred cow is fluoridation of drinking

water. Fact: Fluoride is so toxic that only one milligramconstitutes a prescription dose. In spite of this, the

Enironmental !rotection Agency "E!A# allows up to this

amount in a single glass of drinking water. Fact: $irtually

eery country in Europe has stopped fluoridation. %esearchshows that fluoride confers little if any real benefit. Fact:

!ersons who hae grown up with fluoridated water hae, on

the aerage, only &( of one filling less per lifetime than

people who did not drink fluoridated water "Chemical and

Engineering News, )ay *, &+*+#.


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Of the 50 largest cities in the UnitedStates, ! ha"e communit# $ater

fluoridation% Fluoridation reaches &'of the oulation on u*lic $atersulies+more than 1 million eole%

ater fluoridation costs, on a"erage,-' cents er erson er #ear in U%S%

communities (1... dollars)%

Fluoride also *enefits adults,decreasing the ris/ of ca"ities at theroot surface as $ell as the enamel

cro$n% Use of fluoridated $ater andfluoride dental roducts $ill hel eole maintain oral health and /eemore ermanent teeth%

http:www.cdc.gommwrpreiewmmwrhtmlrr-&a&.htm


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ELECTRODIAL1SIS


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ELECTRODIAL1SIS


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ppt ion exchange

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