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US 2007/0178173 A1Published application
Suppressing microbial growth in pulp and paper
AssigneeNalco Company
InventorsLaura Rice, Andrew Cooper, Robert Wetegrove, Michael Enzien
Life of this patent
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Abstract
A composition for anti-microbial effect in a water system such as a pulp and paper processing line with an aqueous slurry. The composition comprises a free chlorine-generating biocide comprising a chlorine source, urea, and an alkali in a concentration sufficient to provide a pH greater than 10, and typically at least pH 11.
Claims30
A composition for antimicrobial effect in a water system, which composition comprises:
- a free chlorine-generating biocide comprising a chlorine source;
- urea;
- and an alkali in a concentration sufficient to provide a pH of greater than 10.
A method for stabilizing chlorine for use as a water treatment biocide in a process system, comprising the steps of:
- adding, with mixing, a free chlorine source to a point in a stream of the process system;
- adding, with mixing, urea to a point in the stream of the process system;
- and
- adding, with mixing, an alkali to a point in the stream of the process system, to cause mixing of the alkali with the chlorine source and the urea;
- wherein the amount of alkali added is sufficient to achieve a pH greater than 10 at an area of mixing with the urea or derivative thereof.
2 more elements
Dependencies are inferred from the claim text.