BIOCIDAL COMPOSITIONS AND METHODS OF USE
Provided is a biocidal composition comprising glutaraldehyde and an oxazolidine biocidal compound. The composition is useful for controlling microorganisms in aqueous or water containing systems such as found in oil and natural gas production.
1 . A composition comprising:
glutaraldehyde; and
an oxazolidine biocidal compound.
2 . A composition according to claim 1 wherein the weight ratio of glutaraldehyde to oxazolidine biocidal compound is between about 50:1 and 1:50.
3 . A composition according to claim 1 wherein the weight ratio of glutaraldehyde to oxazolidine biocidal compound is between about 20:1 and 1:20.
4 . A composition according to claim 1 wherein the oxazolidine biocidal compound is a monocyclic oxazolidine.
5 . A composition according to claim 4 wherein the monocyclic oxazolidine is 4,4-dimethyoxazolidine, N-methyl-1,3-oxazolidine, N-ethylol-1,3-oxazolidine, 5-methyl-1,3-oxazolidine, 4-ethyl-4-hydroxymethyloxazolidine, 4-ethyloxazolidine, 4-methyl-4-ethyloxazolidine, or mixtures of two or more thereof.
6 . A composition according to claim 1 wherein the oxazolidine biocidal compound is a bicyclic oxazolidine.
7 . A composition according to claim 6 wherein the bicyclic oxazolidine is 1-aza-3,7-bicyclo[3.3.0]octane optionally substituted with C 1 -C 6 alkyl, C 1 -C 6 alkoxy, or hydroxy(C 1 -C 6 alkyl).
8 . A composition according to claim 7 wherein the bicyclic oxazolidine is 7-ethylbicyclooxazolidine, 5-hydroxymethoxymethyl-1-aza-3,7-dioxabicyclo[3.3.0]octane, 5-hydroxymethyl-1-aza-3,7-dioxabicyclo[3.3.0]octane, 5-hydroxypoly(methyleneoxymethyl-1-aza-dioxabicyclo(3.3.0)octane, 1-aza-3,7-dioxa-5-methylol-(3.3.0)-bicyclooctane, or mixtures of two or more thereof.
9 . A composition according to claim 8 wherein the oxazolidine biocidal compound is a mixture of 5-hydroxymethoxymethyl-1-aza-3,7-dioxabicyclo[3.3.0]octane, 5-hydroxymethyl-1-aza-3,7-dioxabicyclo[3.3.0]octane, and 5-hydroxypoly(methyleneoxymethyl-1-aza-dioxabicyclo(3.3.0)octane.
10 . A composition according to claim 1 wherein the oxazolidine biocidal compound is a bisoxazolidine.
11 . A composition according to claim 10 wherein the bisoxazolidine is N,N-methylenebis(5-methyl-oxazolidine), bis-(4,4′-tetramethyl-1,3-oxazolidin-3-yl)-methane, or mixtures of two or more thereof.
12 . A composition according to claim 1 wherein the oxazolidine biocidal compound is a polyoxazolidine.
13 . A composition according to claim 1 further comprising one or more surfactants, ionic/nonionic polymers and scale, corrosion inhibitors, oxygen scavengers or additional biocides.
14 . A composition according to claim 13 wherein the additional biocides are selected from quaternary ammonium compounds, tetrakis(hydroxymethyl)phosphonium salts and tris hydroxymethyl phosphine, 2,2-Dibromo-3-nitrilopropionamide (DBNPA), 2-Bromo-2-nitropropane-1,3-diol (Bronopol), 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one (CMIT/MIT), 2-methyl-4-isothiazolin-3-one, Tris(hydroxmethyl)nitromethane, 1-(3-chloroallyl)-3,5,7,-triaza-1-azonia-adamantane chloride, 1,2-benzisothiazolin-3-one, o-phthalaldehyde, formaldehyde, triazine, 2,6-dimethyl-m-dioxan-4-ol acetate, oxidants such as chlorine, chlorine dioxide, peroxides, peracetic acid, ammonium bromide, sodium bromide, sodium hypochlorite, sodium hypobromite, 1-bromo-3-chloro-5,5-dimethylhydantoin (BCDMH), chloramine, and mixtures of two or more thereof.
15 . A method for controlling microorganisms in an aqueous or water containing system, the method comprising treating the system with a composition according to claim 1 .
16 . A method according to claim 15 wherein the aqueous or water containing system is used or is present in oil and or gas production.
17 . A method according to claim 16 wherein oil and gas production comprises oil and gas field injection and produced water and functional fluids, oil and gas wells, oil and gas operation, separation, storage, and transportation systems, oil and gas pipelines, oil and gas vessels, or fuel.
18 . A method according to claim 15 wherein the aqueous or water containing system is cooling water, boiler water, pulp and paper mill water, other industrial process water, ballast water, wastewater, metalworking fluids, latex, paint, coatings, adhesives, inks, tape joint compounds, personal care and household products, or a system used therewith.
19 . A method according to claim 15 wherein the microorganisms are anaerobic bacteria.
20 . A method according to claim 15 wherein the aqueous or water containing system is at 37° C. or above.