Method and apparatus for producing synergistic biocide

• US 20070049642A1
• Filed: 08/24/2006
• Published: 03/01/2007
• Est. Priority Date: 08/26/2005
• Status: Active Grant

• Current Assignee: Solenis Technologies LP (Innovative Water Care, LLC)
• Original Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Inventors: Singleton, Freddie, Mayer, Michael, Breen, Alexander
• Granted Patent: US 7,311,878 B2
• Time in Patent Office: Days
• US Class Current: 514/612
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 59/00 Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
• CPC Class Codes: C01B 21/091 Chloramine, i.e. NH2Cl or dichloramine, i.e. NHCl2
• CPC Class Codes: C02F 1/50 by addition or application of a germicide or by oligodynamic treatment C02F1/4606, C02F1/467, C02F1/76 take precedence
• CPC Class Codes: Y02W 10/10 Biological treatment of water, waste water, or sewage
• CPC Class Codes: Y02W 10/37 using solar energy

Abstract

An apparatus and methods to produce synergistic mixtures (or combinations) of haloamines to control growth of microorganisms in aqueous systems are disclosed. The apparatus and methods to produce synergistic mixtures entails producing a batch quantity of a haloamine and converting part of the haloamine to a second haloamine species to form the synergistic mixture.

Claims

1. A method for producing an aqueous solution containing a synergistic combination of monohaloamine and dihaloamine biocide to control growth of microorganisms in an aqueous system which comprises

a) contacting an ammonium or an amine source with a halogenated oxidant in amounts of each effective to produce monohaloamine, and

b). reducing the pH to convert a desired portion of the monohaloamine to dihaloamine.

2. The method of claim 1, wherein the ammonium or amine source is ammonia, ammonium hydroxide or an ammonium salt.

3. The method of claim 2 wherein the ammonium salt is selected from the group consisting of aluminum ammonium sulfate, ammonium acetate, ammonium bicarbonate, ammonium bifluoride, ammonium bromide, ammonium carbonate, ammonium chloride, ammonium citrate, ammonium fluoride, ammonium iodide, ammonium molybdate, ammonium nitrate, ammonium oxalate, ammonium persulfate, ammonium phosphate, ammonium sulfate, ammonium sulfide, ferric ammonium sulfate, ferrous ammonium sulfate, and combinations thereof.

4. The method of claim 2 wherein the amine source is selected from the group consisting of polyamines, primary amines, secondary amines, cyclic amines, bicyclic amines, oligocyclic amines, aliphatic amines, aromatic amines, primary and secondary nitrogen containing polymers and combinations thereof.

5. The method of claim 4 wherein the nitrogenous compound is selected from the group consisting of dimethylamine, ethanolamine, ethylenediamine, diethanolamine, triethanolamine, dodecylethanolamine, hexdecylethanolamine, oleic acid ethanolamine, triethylenetetramine, dibutylamine, tributylamine, glutamine, dilaurylamine, distearylamine, tallow-methylamine, coco-methylamine, n-acetylglucosamine, diphenylamine, ethanolmethylamine, diisopropanolamine, n-methylaniline, n-hexyl-n-methylamine, n-heptyl-n-methylamine, n-octyl-n-methylamine, n-nonyl-n-methylamine, n-decyl-n-methylamine, n-dodecyl-n-methylamine, n-tridecyl-n-methylamine, n-tetra-decyl-n-methylamine, n-benzyl-n-methylamine, n-phenylethyl-n-methylamine, n-phenylpropyl-n-methylamine, n-alkyl-n-ethylamines, n-alkyl-n-hydroxyethylamines, n-alkyl-n-propylamines, n-propylheptyl-n-methylamine, n-ethylhexyl-n-methylamine, n-ethylhexyl-n-butylamine, n-phenylethyl-n-methylamine, n-alkyl-n-hydroxypropylamines, n-alkyl-n-isopropylamines, n-alkyl-n-butylamines and n-alkyl-n-isobutylamines, n-alkyl-n-hydroxyalkylamines, hydrazine, urea, guanidines, biguanidines, and combinations thereof.

6. The method of claim 2 wherein the halogenated oxidant is selected from the claim consisting of chlorine, hypochlorite, hypochlorous acid, chlorinated isocyanurates, bromine, hypobromite, hypobromous acid, bromine chloride, halogenated hydantoins, and combinations thereof.

7. The method of claim 1 wherein the ammonium or amine source is ammonium sulfate and the halogenated oxidant is a hypochlorite salt.

8. The method of claim 1 wherein, the halogenated oxidant is a chlorinated oxidant and the pH in step b) is adjusted until the rate of monochloramine to dichloramine is 200:

1 to 1;

100.

9. The method of claim 8 wherein the amount of monochloramine, on an active level basis, ranges from about 0.01 to about 10,000 mg/l as Cl₂ based on the volume of the aqueous system being treated and the amount of dichloramine, on an active level basis, ranges from about 0.0.01 to about 10,000 mg/l as Cl₂ based on the volume of the aqueous system being treated.

10. Apparatus for processing the haloamines of claim 1 comprising

a) providing a water-containing reservoir (3),

b) providing two inlet into said reservoir (5, 8),

c) providing a pH probe (11) in said reservoirs,

d) providing pumps for pumping liquid into said inlets,

e) providing a pH control for operating and monitoring an acid solution means whereby the pH in the reservoir 3 is controlled, and

f) a pump is provided to pump liquid from reservoir 3 to an aqueous system.