Prevention of starch degradation in pulp, paper or board making processes
A starch degradation and starch technology, applied in chemical instruments and methods, preservation of human or animal bodies, botanical equipment and methods, etc., can solve the problem of increasing starch dosage, economically unfeasible high biocide dosage, insufficient efficacy, etc. question
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0042] Prevention of starch degradation was investigated using oxidizing biocides (monochloramine, MCA) and zinc. Head box slurries from packaging board mills collected and stored at +4°C were amended with 0.8 g / l cooked starch and incubated overnight at 45°C with shaking at 150 rpm to induce Growth of starch-degrading bacteria. The slurry was divided into 30ml portions and the appropriate amount of zinc (Zn from zinc chloride 2+) and MCA were added together with freshly added starch (400mg / l). After 4h and 24h incubation (+45°C, 150rpm), remaining starch was quantified using iodine staining (Lugol-solution) at 590nm. An external standard curve was used to convert absorbance values to starch amounts.
[0043] Table 1 below and figure 1 It is shown that when no bacteria were present (sterile control), the measured starch concentration was about 250 mg / l after 4 h and 200 mg / l after 24 h. Remaining starch has likely been retained on the fibers. In the untreated control, ...
Embodiment 2
[0047] Use of oxidizing biocides (chlorine dioxide, ClO 2 ) and zinc to study the prevention of starch degradation. Head box slurries from packaging board mills collected and stored at +4 °C were modified with 0.8 g / l cooked starch and incubated overnight at 45 °C with shaking at 150 rpm to induce starch degrading bacteria growth. The slurry was divided into 30ml portions and the appropriate amount of zinc (Zn from zinc chloride 2+ ) and ClO 2 Added together with freshly added starch (400mg / l). After 4h and 24h incubation (+45°C, 150rpm), remaining starch was quantified using iodine staining (Lugol's solution) at 590nm. An external standard curve was used to convert absorbance values to starch amounts.
[0048] Table 2 below and figure 2 It is shown that when no bacteria were present (sterile control), the measured starch concentration was about 350 mg / l after 4 h and 300 mg / l after 24 h. Remaining starch has likely been retained on the fibers. In the untreated cont...
Embodiment 3
[0052] Prevention of starch degradation was investigated using oxidative biocides (performic acid, PFA) and zinc. Head box slurries from packaging board mills collected and stored at +4 °C were modified with 0.8 g / l cooked starch and incubated overnight at 45 °C with shaking at 150 rpm to induce starch degrading bacteria growth. The slurry was divided into 30ml portions and the appropriate amount of zinc (Zn2+ from zinc chloride) and PFA was added along with the fresh addition of starch (400mg / l). After 4h and 24h incubation (+45°C, 150rpm), remaining starch was quantified using iodine staining (Lugol's solution) at 590nm. An external standard curve was used to convert absorbance values to starch amounts.
[0053] Table 3 below and image 3 It is shown that when no bacteria were present (sterile control) the measured starch concentration was about 300 mg / l after 4 h. Remaining starch has likely been retained on the fibers. In the untreated control, most of the starch ha...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More