Stable composition for controlling biological growth and method for using same in oil field applications
AssigneeLonza Ltd.
InventorKevin E. Janak
Life of this patent
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Abstract
A stabilized composition is disclosed which contains at least two biocides, particularly at least two non-oxidizing biocides. In one embodiment, the composition contains a phosphonium sulfate compound combined with a dialkyl dimethyl quaternary amine compound. In order to stabilize the composition, an alkyl trimethyl ammonium compound is added to the composition. In one embodiment, the stabilizing agent produces a single phase composition. With the aid of the stabilizing agent, the single phase concentrated compositions can be produced that can later be diluted for use. In one embodiment, the composition may be used to treat aqueous systems in industrial applications.
Claims20
A composition for preventing biofilm growth comprising:
- a first non-oxidizing biocide blended with a second non-oxidizing biocide, the second biocide comprising a quaternary ammonium compound, the first biocide and the second biocide being blended with a stabilizing agent, the stabilizing agent comprising an alkyltrimethylammonium compound that is different than the second biocide,
- wherein the first biocide and the second biocide are present in the composition at concentrations such that the biocides are immiscible,
- wherein the composition has a total active concentration of greater than 15% by weight, and
- wherein the stabilizing agent is present in an amount sufficient to produce a single phase solution.
A method of controlling biofilm growth in an industrial system comprising adding to an aqueous medium in the industrial system a composition comprising a first non-oxidizing biocide blended with a second non-oxidizing biocide, the second biocide comprising a quaternary ammonium compound, the first biocide and the second biocide being blended with a stabilizing agent, the stabilizing agent comprising an alkyltrimethylammonium compound that is different than the second biocide,
- wherein the first biocide and the second biocide are present in the composition at concentrations such that the biocides are immiscible,
- wherein the composition has a total active concentration of greater than 15% by weight, and
- wherein the stabilizing agent is present in an amount sufficient to produce a single phase solution.
Dependencies are inferred from the claim text.