Ultrapure hydroxylamine compound solutions and process of making same
AssigneeSachem, Inc.
InventorsHossein Sharifian, John W. Drew
Life of this patent
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Abstract
In one embodiment, the present invention relates to a method of treating a solution containing hydroxylamine, involving subjecting the solution containing hydroxylamine to fractional distillation using a packed column thereby providing a first distillate; and subjecting the first distillate to flashover distillation thereby providing a second distillate containing a hydroxylamine solution. In another embodiment, the present invention relates to an ultrapure solution simply containing hydroxylamine, at least one stabilizer, and water.
Claims35
A method of treating a solution containing hydroxylamine, comprising:
- subjecting the solution comprising hydroxylamine to fractional distillation using a packed column at a temperature below about 70° C. and at a pressure below about 50 torr, thereby providing a first distillate;
- and
- subjecting the first distillate to flashover distillation at a temperature below about 80° C., thereby providing a second distillate comprising a treated hydroxylamine solution.
A method of treating a solution containing hydroxylamine, comprising:
- subjecting the solution comprising hydroxylamine to fractional distillation using a packed column at a temperature below about 75° C., thereby providing a first distillate;
- and
- subjecting the first distillate to flashover distillation at a temperature below about 75° C. and at a pressure below about 60 torr, thereby providing a second distillate comprising a treated hydroxylamine solution.
A method of purifying a solution containing hydroxylamine, comprising:
- subjecting the solution comprising hydroxylamine to fractional distillation using a packed column below about 75° C. and below about 100 torr thereby providing a first distillate;
- and
- subjecting the first distillate to flashover distillation below about 80° C. and below about 100 torr thereby providing a second distillate comprising a purified hydroxylamine solution.
A method of removing at least a portion of at least one of ammonia, ionic compounds and metal contaminants from a solution containing hydroxylamine and at least one of ammonia, ionic compounds and metal contaminants, comprising:
- subjecting the solution comprising hydroxylamine and at least one of ammonia, ionic compounds and metal contaminants to fractional distillation using a column packed with a non-metallic material at a temperature above 65° C. and below about 75° C. and at a pressure above 50 torr and below about 100 torr, thereby providing a first distillate;
- and
- subjecting the first distillate to flashover distillation at a temperature below about 75° C., thereby providing a second distillate comprising a hydroxylamine solution comprising less of at least one of ammonia, ionic compounds and metal contaminants than the solution containing hydroxylamine and at least one of ammonia, ionic compounds and metal contaminants.
A method of removing at least a portion of at least one of ammonia, ionic compounds and metal contaminants from a solution containing hydroxylamine and at least one of ammonia, ionic compounds and metal contaminants, comprising:
- subjecting the solution comprising hydroxylamine and at least one of ammonia, ionic compounds and metal contaminants to fractional distillation using a column packed with a non-metallic material at a temperature below about 70° C. thereby providing a first distillate;
- and
- subjecting the first distillate to flashover distillation at a temperature below about 80° C. and at a pressure above 50 torr and below about 100 torr, thereby providing a second distillate comprising a hydroxylamine solution comprising less of at least one of ammonia, ionic compounds and metal contaminants than the solution containing hydroxylamine and at least one of ammonia, ionic compounds and metal contaminants.
Dependencies are inferred from the claim text.