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US 5,788,946 AGranted
Purification of hydroxylamine
AssigneeAshland Inc.
InventorsFloyd Riddle, Frank Michelotti
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.
Claims10
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 acid groups to the hydrogen form, and then
- B. passing the solution from Step A through at least one strong base anion exchange resin bed that is in the hydroxyl 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 sodium hydroxide or potassium hydroxide;
- e) passing an aqueous solution containing about 5 to 20% by weight of hydroxylamine through said strong acid ion exchange beds from step c);
- and then
- f) passing an aqueous solution containing about 50% by weight of hydroxylamine through said strong acid ion exchange beds from step e) and then through said strong base ion exchange beds from step d).
4 more elements
Dependencies are inferred from the claim text.