AMBERLITETM IRA74
硼***树脂的技术参数
PRACTICAL GUIDE
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Boron Removal
Using Amberlite IRA743
INTRODUCTION
With Amberlite IRA743, borate can be removed very effectively from water. IRA743 is so selective for boric acid that practically any salt background is tolerable. There are different fields of application:
n Removal of boron for drinking water
n Removal of boron in ultrapure water
n Treatment of magnesium brines containing boron
n Removal of boron from water for irrigation
We will focus here on the drinking water application, although most of the following information is valid for all fields.
BORON
Boron in water is always present as some form of boric acid, which is a very weak acid, similar to silicic acid ("silica") with a pK value of 9.1. At a pH lower than 7, boric acid is undissociated as H3BO3 or B(OH)3. Boric acid is a Lewis acid, i.e. an OH— acceptor rather than a H+ donor. At a pH higher than 11.5, boron occurs as dissociated borate [B(OH)4]—.
B(OH)3 + NaOH Ö [B(OH)4]— + Na+
ION EXCHANGE REACTION
Amberlite IRA743 is a macroporous styrenic resin with methyl glucamine functionality. The active group is essentially a weak base (tertiary amine) with a "sugar tail". A developed formula is shown here:
CH3 | OH H | H | OH | |||||||||||||||
CH2 | N | CH2 | C | C | C | C | CH2OH | |||||||||||
H OH OH H
The uptake of boron as borate [B(OH)4]— is a curious mechanism, as it involves protonation of
the amine, de-protonation of the polyol sugar tail, shedding of water and formation of an ester. The next picture is believed to be the final result:
+ | CH3 | OH H | H | OH | ||||||||||||||||
CH2OH | ||||||||||||||||||||
CH2 | N | CH2 | C | C | C | C | ||||||||||||||
H | H | O | O | H | ||||||||||||||||
B
OH OH
The uptake of borate by Amberlite IRA743 can in principle be done with the resin in acidic form (e.g. HCl) as a true substitution combined with complex formation. However it has been demonstrated experimentally that the capacity was higher with the resin in free base form.
RESINS USED
There is only one resin: Amberlite IRA743. As this is a weakly basic resin, it is usually regenerated in co-flow.
OPERATING CAPACITY
The most important parameter is flow rate as shown in the graph. Boron concentration and salt background have little effect on operating capacity.
Amberlite IRA743
4.5 | |||||||||
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