Chlorine Dioxide Treatment Compositions and Processes

a technology of chlorine dioxide and compositions, applied in the direction of biological water/sewage treatment, cellulose treatment using microorganisms/enzymes, microorganism/enzyme addition, etc., can solve the problem of reducing the efficiency of chlorine dioxide treatment, and achieve the effect of improving delignification and/or brightening

Inactive Publication Date: 2008-08-14
NOVOZYMES AS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]The present invention relates to methods and compositions for chlorine dioxide delignification and / or bleaching processes by reacting pulp with chlorine dioxide and a peroxidase and / or a laccase. In accordance with the present invention, a peroxidase and / or a laccase is / are added to a chlorine dioxide delignification and / or bleaching step. Although not limited to any one theory of operation, the addition of a peroxidase and / or a laccase to a chlorine dioxide treating composition is believed to result in the regeneration of chlorine dioxide from chlorite, resulting in improved delignification and / or brightening during bleaching of pulp.

Problems solved by technology

During the chlorine dioxide treatment processes some of the chlorine dioxide is converted to chlorate and chlorite, which decreases the efficiency of the chlorine dioxide treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020]160 mg of NaCIO2 was dissolved in 100 mL of DI water. 10 mL aliquots of the NaClO2 solution were added to different test tubes. 20 uL of acetic acid were added to each tube and the pH was adjusted to about 3.5. Then 100 uL of enzyme was added to the solution. After 30 min of incubation at ambient temperature, the solution was diluted 3 times by DI water. ClO2 formation was detected by UV absorbency at 360 nm. It is evident that all of the enzymes can generate ClO2 to some extent under the conditions used in this experiment.

TABLE 1Enzymatic Chlorine Dioxide GenerationAbsorbencyNo.Sampleat 360 nm1Control0.1552Peroxidase from Coprinus cinereus0.764(Novozymes)3Haloperoxidase from Curvularia verruculosa0.168(Novozymes)4Laccase from Trametes villosa0.802(Novozymes)5Laccase from Coprinus cinereus0.190(Novozymes)6Laccase from Myceliophthora thermophila0.197(Novozymes)7Chloroperoxidase from Caldariomyces fumago0.393(Sigma, C-0278)

example 2

[0021]5 g (o.d. dry) of unbleached kraft pulp was added to each beaker and diluted to about 5% consistency. The pulp was adjusted to various pH by 2N H2SO4. 10 mL of 11.3 / L of NaClO2 was added to each beaker. 500 ul of peroxidase (Coprinus cinereus peroxidase, Novozymes) was added to the solution and the beaker was incubated at 60° C. for 1 hr. After bleaching, the pulp was rinsed with DI water and handsheets were made and tested for brightness. Brightness was tested according to Tappi standard (T452). It is clear the peroxidase improved pulp brightness in all the pH range.

pHSampleBrightness3Control50.43Peroxidase51.44Control46.84Peroxidase47.35Control43.35Peroxidase44.26Control42.86Peroxidase45.0

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Abstract

The present invention relates to methods and compositions for chlorine dioxide delignification and/or bleaching processes by reacting pulp with chlorine dioxide and a peroxidase and/or a laccase.

Description

FIELD OF THE INVENTION[0001]The present invention relates to methods and compositions for improving chlorine dioxide treatment processes, such as, pulp delignification and bleaching processes.BACKGROUND[0002]Chlorine dioxide is one of the most widely used delignification / bleaching agents in the pulp and paper industry, providing a high-quality, low-cost delignification and bleaching process. Chlorine dioxide treatment is superior to chlorine bleaching processes in that it virtually eliminates all dioxin discharges into the environment, and has accordingly, helped pulp and paper manufactures to employ environmentally friendly processes and to meet environmental requirements. Accordingly, the use of chlorine dioxide treatment is increasing and most pulp and paper mills now have at least one chlorine dioxide delignification or bleaching stage. Chlorine dioxide treatment has also been used to treat wastewater, sludge and other process streams.[0003]During the chlorine dioxide treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21C3/18D21C9/14
CPCC02F1/76C02F3/342D21C9/14D21C3/18D21C5/005C02F2103/28D21H11/04D21H17/005D21H17/675D21H17/74
Inventor XU, HUIBLOOMFIELD, KIMLUND, HENRIK
Owner NOVOZYMES AS
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