How can hydroxylamine (HA) be efficiently separated from metal ions to produce high-purity HA?

Label:chem

Topic
Hydroxylamine (HA) is widely used in chemical, pharmaceutical, and electronic industries. Traditional methods of HA production, such as distillation or ion exchange, often result in impurities like metal ions and inorganic acid ions, which can accelerate the decomposition of HA and limit its applications. Therefore, developing an efficient separation method to obtain high-purity HA is crucial.
Answer
The study presents a method using a polymer inclusion membrane (PIM) coupled with electrodialysis (ED) to separate hydroxylamine (HA) from metal ions. The PIM, containing thenoyltrifluoroacetone (TTA) as a carrier, selectively transports HA driven by a proton gradient. The ED process continuously provides this proton gradient without introducing other ions. Under optimal conditions, the separation factors for NH2OH(I)/Na(I) and NH2OH(I)/K(I) were 30.81 and 35.11, respectively, and the purity of HA reached 99.4%. This PIM-ED process effectively produces high-purity HA by controlling metal ion concentrations and pH.
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