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US 5,872,295 AGranted
Purification of hydroxylamine
AssigneeConcept Sciences, Inc.
InventorsFrancis Michelotti, Irl E. Ward
Life of this patent
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Abstract
The invention provides a method for purification of hydroxylamine so as to have a substantial reduction of cations and anions. The method involves passing a solution of hydroxylamine through at least one strong acid ion exchange bed which has been pretreated with dilute hydrochloric acid and then through at least one strong base anion exchange resin bed which has been pretreated or regenerated with a non-metal amino or hydroxide base solution.
Claims14
A method for the purification of hydroxylamine which comprises the steps of:
- A. passing an aqueous solution of hydroxylamine through at least one macroporous or gel strong acid cation exchange resin bed which has been treated with a dilute solution of hydrochloric acid to convert all active resin sites to the acid form, and then
- B. passing the solution from Step A through at least one strong base anion exchange resin bed that has been treated or regenerated with a non-metal amino or hydroxide base solution to convert all active resin sites to the hydroxyl basic form.
A method for the purification of hydroxylamine which comprises the steps of:
- a) forming a multiplicity of strong acid ion exchange beds;
- b) forming a multiplicity of strong base ion exchange beds;
- c) treating the strong acid ion exchange beds with a dilute hydrochloric acid solution;
- d) treating the strong base ion exchange beds with a solution of ammonium hydroxide or tetramethylammonium hydroxide;
- e) passing an aqueous solution containing about 5 to 20% by weight of hydroxylamine through said strong acid and cation exchange beds;
- and then
- f) passing an aqueous solution containing about 50% by weight of hydroxylamine through said strong acid and strong base ion exchange beds.
4 more elements
Dependencies are inferred from the claim text.