Nalco Company

Yu-Mei Lu

Laura E Rice

Wen Li Tu

Amit Gupta

Jian Shen

Andrew J Cooper

Elisa M Luth

Randall Elliott

Jian Kun Shen

Eliza M Luth

A method of producing stable disinfectant for use as a biocidal composition. The method comprises: providing reagents, asynchronously feeding the reagents into a wide space, and allowing all the reagents to come into contact and mix with each other. The reagents comprise: a) an amine source in concentrated form, b) an oxidizing halogen compound in concentrated form, and c) a diluent. The use of asynchronous feeding and a wide space results in a dynamic biocide regimen. This regimen results in a changing environment that infestations have difficulty adapting to. This method also imparts superior results due to the avoidance of channeling effects which would otherwise weaken the effects of the biocide.

Methods for the on-site production of chloramine and uses thereof

The invention is directed to compositions and methods of their use as effective biocidal agents for water streams. The composition comprises a halogen source, halogen stabilizers containing a sulfur bearing species and ammonium salts/urea, and an alkali. The sulfur bearing species includes sulfamic acid or its salt equivalent. By having optimized mixing ratio of halogen to stabilizer and that of ammonium salts to sulfamic acid or sulfamate, a synergistic effect occurs which both increases the efficacy of the composition as a biocide and it avoids adverse impacts on other chemicals that are present in the water stream. Best of all the composition is easy to form and easy to introduce into a water stream of concern. Its introduction can be as simple as mixing two containers of reagent prior to introduction to the water process stream.

Use of sulfamic acid or its salts as stabilizers especially in combination with ammonium salt and/or ammine for bleach or other halogen containing biocides in the paper area

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Taipei, Taiwan

Yu-Mei Lu