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Improved biological control by using chlorine-stabilizing agent mixture

A stabilizer, mixture technology, applied in the field of biologically active compositions, can solve problems such as increasing the complexity of biocides

Inactive Publication Date: 2013-04-24
NALCO CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, many biocides are inherently incompatible with other biocides, and application of multiple biocides each with their own preparation and incorporation problems requires excessive investment in complex application equipment
Also, multiple biocide dispensers are installed at various points along the papermaking line, thereby greatly increasing the cost and complexity of adding biocide

Method used

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  • Improved biological control by using chlorine-stabilizing agent mixture
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  • Improved biological control by using chlorine-stabilizing agent mixture

Examples

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Embodiment

[0087] The foregoing may be better understood by reference to the following examples, which are intended for purposes of illustration and are not intended to limit the scope of the invention.

[0088] A large number of biocide formulations were prepared and applied to process water samples from a paper mill. Their composition and efficiency are listed in Figure 4 and Table 1. Table 1 illustrates that a composition containing 12% sulfamic acid and 3% ammonium sulfate was able to achieve high product yields without the addition of NaOH. It also shows that the addition of NaOH to the bleach improves the feasibility of mixing stabilizers at different ratios.

[0089] Optimization of mixing conditions for mixing stabilizer and sodium hypochlorite

[0090]

[0091] * SA sulfamic acid

[0092] ** AS: Ammonium sulfate

[0093] *** TRO: Total Residual Oxidants

[0094] **** FRO: free residual oxidant

[0095] Table 1

[0096] Figure 4 It was shown that 12% sulfamic ac...

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PUM

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Abstract

The invention relates to improved biological control by using a chlorine-stabilizing agent mixture. The invention discloses a composition and an application method thereof. The composition comprises a halogen source, urea, an extra halogen stabilizing agent excluding urea and optional alkalis with concentrations enough to provide a pH value more than 10 for the composition, and does not comprise stable bromine compounds optionally. Besides, the invention discloses a method for reducing bioactivity in a process stream. Through the optimized mixing ratio of the halogen and the stabilizing agent and mixing ratio of ammonium salt and sulfamic acid or sulfamate, synergy appears, which not only improves the effect of the composition as a biocide but also avoids adverse effects on other chemicals (such as paper pulp and paper additives in the papermaking water flow) in the water flow.

Description

[0001] Cross References to Related Applications [0002] none. [0003] Statement Regarding Federally Sponsored Research or Development [0004] Not applicable. Background technique [0005] At least one invention relates to compositions and methods for reducing biological activity in process streams, such as aqueous process streams. Biological activity in process streams can be problematic for a variety of reasons including, but not limited to, sanitation issues, process equipment efficiency issues, and product quality issues. For example, in the papermaking process, high levels of bioactivity have detrimental effects on equipment operation. The problems associated with the manufacture of certain types of paper such as tissue / recycled paper products are more pronounced because high fungal levels present the dilemma of providing sufficient biocide stability so that it is not easily consumed (good persistence). The conflict between biocidal regimens and providing sufficient...

Claims

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Application Information

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IPC IPC(8): A01N59/00A01N25/22A01P1/00A01P3/00C02F1/50
CPCD21H17/03D21H17/11D21H21/00D21H21/36
Inventor 劳拉·E·里斯安德鲁·J·库珀伊丽莎·M·卢特温力图
Owner NALCO CO
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