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Prevention of starch degradation in pulp, paper or board making processes

A pulp and starch technology, applied in the field of biocidal system to prevent or reduce starch degradation in pulp, paper or board manufacturing methods, can solve paper quality problems, insufficient efficacy, increase starch dosage and other problems

Inactive Publication Date: 2014-06-25
KEMIRA OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause paper quality issues, or optionally force an increase in starch dosage with unwanted additional costs
[0006] Current methods of controlling starch degradation are either insufficiently effective or require high biocide dosages that are not economically viable

Method used

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  • Prevention of starch degradation in pulp, paper or board making processes
  • Prevention of starch degradation in pulp, paper or board making processes
  • Prevention of starch degradation in pulp, paper or board making processes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Use oxidizing biocides (monochloramine, MCA) and zinc to study the prevention of starch degradation. The head box slurry from the packaging board factory, which was collected and stored at +4°C, was amended with 0.8g / l cooked starch and incubated overnight at 45°C with shaking at 150rpm for induction The growth of starch degrading bacteria. Divide the slurry into 30ml portions, and combine the appropriate amount of zinc (Zn 2+ ) And MCA are added together with newly added starch (400mg / l). After 4h and 24h incubation (+45°C, 150rpm), the remaining starch was quantified using iodine staining (Lugol-solution) at 590nm. The external standard curve is used to convert the absorbance value into the amount of starch.

[0042] Table 1 and figure 1 It is shown that when there is no bacteria (sterile control), the measured starch concentration is about 250 mg / l after 4 h and 200 mg / l after 24 h. The remaining starch has probably been retained on the fiber. In the untreated contr...

Embodiment 2

[0046] Use oxidizing biocides (chlorine dioxide, ClO 2 ) And zinc study the prevention of starch degradation. The head box slurry from the packaging board factory, which was collected and stored at +4°C, was modified with 0.8g / l cooked starch, and incubated overnight at 45°C under 150rpm shaking to induce starch degrading bacteria Growth. Divide the slurry into 30ml portions, and combine the appropriate amount of zinc (Zn 2+ ) And ClO 2 It is added together with newly added starch (400mg / l). After 4h and 24h incubation (+45°C, 150rpm), the remaining starch was quantified using iodine staining (Lugo's solution) at 590nm. The external standard curve is used to convert the absorbance value into the amount of starch.

[0047] Table 2 and figure 2 It is shown that when there is no bacteria (sterile control), the measured starch concentration is about 350 mg / l after 4 h and 300 mg / l after 24 h. The remaining starch has probably been retained on the fiber. In the untreated control,...

Embodiment 3

[0051] Using oxidizing biocides (performic acid, PFA) and zinc to study the prevention of starch degradation. The head box slurry from the packaging board factory, which was collected and stored at +4°C, was modified with 0.8g / l cooked starch, and incubated overnight at 45°C under 150rpm shaking to induce starch degrading bacteria Growth. The slurry was divided into 30 ml portions, and appropriate amounts of zinc (Zn2+ from zinc chloride) and PFA were added together with newly added starch (400 mg / l). After 4h and 24h incubation (+45°C, 150rpm), the remaining starch was quantified using iodine staining (Lugo's solution) at 590nm. The external standard curve is used to convert the absorbance value into the amount of starch.

[0052] Table 3 and image 3 It is shown that when there is no bacteria (sterile control), the measured starch concentration is about 300 mg / l after 4 h. The remaining starch has probably been retained on the fiber. In the untreated control, most of the st...

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Abstract

The invention relates to biocidal systems comprising zinc ions and an oxidizing or non-oxidizing biocide, their use, and methods for preventing or decreasing starch degradation in starch-containing process waters from pulp, paper or board production processes.

Description

Technical field [0001] This application relates to biocides, and more specifically to biocide systems including Zn ions and biocides, their uses, and methods for preventing or reducing starch degradation in pulp, paper or board manufacturing processes. Background technique [0002] It is well known that oxidizing or non-oxidizing biocides are used in the pulp, paper or board manufacturing industry to control the growth of microorganisms. Examples of commonly used non-oxidizing biocides are glutaraldehyde, 2,2-dibromo-3-nitrilopropionamide (DBNPA), 2-bromo-2-nitropropane-1,3-diol (bromo Nitropropanediol (Bronopol)), quaternary amine compounds, carbamates, 5-chloro-2-methyl-4-isothiazolin-3-one (CMIT) and 2-methyl-4-isothiazoline- 3-ketone (MIT). Typical examples of commonly used oxidizing biocides are chlorine, hypochlorites, hypochlorous acid, chlorinated isocyanurate, bromine, hypobromite, hypobromous acid, bromine chloride, chlorine dioxide, Ozone, hydrogen peroxide or perox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01N59/00A01N37/16A01N35/02C02F1/00D21H21/00
CPCA01N59/16C02F1/50C02F2103/28C02F1/505D21H21/36A01N2300/00A01N35/02A01N37/16A01N59/00C02F1/00D21H21/00A01N65/00A61Q17/005
Inventor M·科拉里J·艾克曼S·伊卡瓦尔克
Owner KEMIRA OY
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