Method for producing haloamines and haloamine solutions
A method for producing a haloamine solution with reduced amounts of halogen oxyanions including (a) the on-site generation of a halogen-containing oxidant, such as a solution and (b) reacting on-site the halogen-containing oxidant with a nitrogen source, to thereby produce the haloamine solution.
1. A method for producing a haloamine solution with reduced amounts of halogen polyoxyanions comprising
(a) on-site generation of a halogen-containing oxidant solution, wherein the halogen-containing oxidant solution contains hypohalite; and
(b) reacting on-site the on-site generated halogen-containing oxidant with a nitrogen source, to thereby produce the haloamine solution with reduced amounts of halogen polyoxyanions,
wherein the on-site generation comprises reacting at least one halogenated hydantoin compound with water,
wherein the haloamine solution comprises less than 5% by weight of halogen polyoxyanions.
2. The method of claim 1 , wherein the haloamine comprises monochloramine (MCA).
3. The method of claim 1 , wherein the nitrogen source is ammonia, an ammonia solution, or an ammonium salt.
4. The method of claim 1 , wherein the at least one halogenated hydantoin compound is selected from the group consisting of 1,3-dibromo-5,5-dimethylhydantoin, 1,3-dichloro-5,5-dimethylhydantoin, and 1-bromo-3-chloro-5,5-dimethylhydantoin.
5. The method of claim 1 , wherein the halogen-containing oxidant solution contains a hypohalite that is hypochlorite.
6. The method of claim 1 , wherein the halogen-containing oxidant solution is a dilute solution having a hypochlorite concentration of 1-25 g/L.
7. The method of claim 1 , wherein the on-site generation of haloamine is conducted in a single step in which electrolysis or passing an electric current through a solution is not used to produce chlorine gas or hypochlorite solution in an intermediate upstream stage.
8. The method of claim 1 , wherein the halogen-containing oxidant solution generated on-site is fed directly, without storage, into a haloamine generator and reacted with the nitrogen source.
9. The method of claim 1 , wherein the hypohalite solution generated on-site is accumulated into an intermediate tank for up to 24 hours and then fed to a chloramine generator and reacted with the nitrogen source.
10. The method of claim 1 , wherein the hypohalite solution generated on-site is used immediately to produce the haloamine, thereby eliminating formation of halogen oxyanions containing more than one oxygen atom.
11. The method of claim 1 , wherein the on-site generation does not use electrolysis.