Method for producing haloamines and haloamine solutions

Patent metadata

Field	Value
Publication number	US-12434970-B2
Application number	US-202318473949-A
Country	US
Kind code	B2
Filing date	Sep 25, 2023
Priority date	Nov 30, 2018
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Buckman Laboratories Int Inc

Inventors

• Launay Bruno
• Kuznetsov Dimitri
• Mcneel Thomas

Classifications

• C25B1/26

  Chlorine; Compounds thereof (by simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine C25B1/34) · CPC title

• C01B11/06

  Hypochlorites · CPC title

• A01N59/00

  Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds · CPC title

• C02F1/76

  with halogens or compounds of halogens {(C02F1/4674 takes precedence)} · CPC title

• C02F1/4674

  with halogen or compound of halogens, e.g. chlorine, bromine · CPC title