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US 2015/0307380 A1Published application
Formulations containing a non-oxidative biocide and a source of active halogen and use thereof in water treatment
AssigneeBromine Compounds Ltd.
InventorsDavid Feldman, Michael Adda, Raymond J. Roccon
Life of this patent
Estimating the term…
Abstract
Novel formulations containing a non-oxidative biocide, such as DBNPA, and a source of an in situ produced active biocide, such as a concentrated aqueous solution of an inorganic halide salt, are disclosed. These novel formulations are particularly effective in the treatment of water, and are characterized by high stability, desirable rheological properties and an excellent biocidal activity.
Claims21
-53. (canceled)
A method of treating an aqueous composition which comprises:
- a) introducing to an aqueous composition for which biocidal treatment is desired a liquid formulation comprising at least one non-oxidative biocide and a concentrated aqueous solution of an inorganic halide salt that produces an active halogen upon activation by an oxidizer;
- and,
- b) introducing to the aqueous composition an oxidizer that activates the inorganic halide salt component of the liquid formulation to produce an active halogen in situ, the oxidizer being introduced to the aqueous composition prior to, with and/or following introduction of liquid formulation to the aqueous composition, the amount of liquid formulation and oxidizer introduced to the aqueous composition being effective to kill, prevent or inhibit the growth of microorganisms therein.
A method of treating an aqueous composition which comprises:
- a) introducing to at least one aqueous composition selected from the group consisting of drinking water, sewage water, process water used in papermaking, process water used in industrial cooling, washing water, heavy oil sludge, cutting oil, lignin-containing liquor and textile oil for which biocidal treatment is desired a liquid formulation comprising at least one non-oxidative biocide selected from the group consisting of bronopol and 2,2-dibromo-3-nitrilopropionamide, and a concentrated aqueous solution of sodium bromide;
- and,
- b) introducing to the aqueous composition at least one oxidizer selected from the group consisting of hypochlorite salt and hypochlorous acid, the oxidizer activating the sodium bromide to produce an active bromide in situ, the oxidizer being introduced to the aqueous composition prior to, with and/or following introduction of liquid formulation to the aqueous composition, the amount of liquid formulation and oxidizer introduced to the aqueous composition being effective to kill, prevent or inhibit the growth of microorganisms therein.
Dependencies are inferred from the claim text.