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Method of slime control in paper pulp manufacturing process

A control method and process technology, which is applied in the addition of pulp control agent, chemical instruments and methods, papermaking, etc., can solve problems such as reduced effect, and achieve the effect of inhibiting decomposition and high addition amount

Inactive Publication Date: 2014-12-10
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similarly to organic fungicides, these inorganic fungicides are less effective due to decomposition due to the reaction with reducing substances and dissolved organic substances in the pulp manufacturing process, posing a bigger problem than organic fungicides.

Method used

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  • Method of slime control in paper pulp manufacturing process
  • Method of slime control in paper pulp manufacturing process
  • Method of slime control in paper pulp manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0047] Hereinafter, experimental examples corresponding to examples of the present invention or comparative examples are listed, and the present invention will be more specifically described.

[0048] It should be noted that the reagent used in the following experimental examples is sodium chlorite (NaClO 2 ), sodium hypochlorite (NaClO) and inorganic fungicides (mixed product of NaClO and ammonium bromide, NaClO:NH 4 Br=1:1 (molar ratio of Cl to N)).

[0049] In addition, in the measurement of the residual chlorine concentration, three of the DPD method (total chlorine), the DPD method (free chlorine), and the iodine titration method (JIS K0101) are implemented.

[0050] In the DPD method (total chlorine), the determination of NaClO and (NaClO+NH 4 Br) Both, NaClO not determined 2 .

[0051] In the DPD method (free chlorine), only NaClO is measured, and inorganic fungicides (NaClO+NH 4 Br) and NaClO 2 .

[0052] In the iodine titration method (JISK0101), determination ...

experiment example 1

[0061] [Experimental Example 1 (Example of the present invention)]

[0062] NaClO 2 With inorganic fungicides (NaClO+NH 4 Br) were diluted to Cl 2 Calculate about 50mg / L and mix in equal amounts. After mixing, the residual chlorine concentration was measured 15 minutes later, and the results are shown in Table 1.

experiment example 2

[0063] [Experimental example 2 (comparative example)]

[0064] Use NaClO instead of NaClO 2 , except that it was mixed in the same manner as in Experimental Example 1, and the residual chlorine concentration was measured. The results are shown in Table 2.

[0065] Table 1

[0066] Table 1. NaClO 2 with (NH 4 Chlorine concentration when Br+NaClO) mixed

[0067]

[0068] Table 2

[0069] Table 2.NaClO and (NH 4 Chlorine concentration when Br+NaClO) mixed

[0070]

[0071] As shown by the results of Experimental Example 1 and Experimental Example 2, NaClO and inorganic fungicides (NaClO+NH 4 In the experimental example 2 of Br), the two reagents were clearly decomposed, on the other hand, mixed with NaClO 2 With inorganic fungicides (NaClO+NH 4 In Experimental Example 1 of Br), the decomposition of the two reagents was not confirmed, and it can be seen that by adding chlorite (salt) instead of hypochlorite to the water system in the pulp manufacturing process, the...

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PUM

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Abstract

The present invention enables slime control by adding an optimal oxidant in a paper pulp manufacturing process for which the stock material is used paper, which includes a considerable amount of reducing substances and dissolved organic matter, thus preventing decomposition of inorganic chlorine bactericide and exerting high bactericidal efficacy with less of the inorganic bactericide added. An inorganic bactericide generated from hypochlorous acid (salt) and ammonium salt and chlorous acid (salt) are added to an aqueous system for a paper pulp manufacturing process for which the stock material is used paper. The inorganic bactericide generated from hypochlorous acid (salt) and ammonium salt is added after the chlorous acid (salt) has been added. Alternatively, the chlorous acid (salt) is added further upstream in the manufacturing process than the addition of the inorganic bactericide generated from hypochlorous acid (salt) and ammonium salt.

Description

technical field [0001] The present invention relates to a method for controlling sloughing in a pulp manufacturing process, and more particularly to a method for controlling slagging by combining an appropriate oxidizing agent when using an inorganic bactericide in a pulp manufacturing process using waste paper as a raw material to efficiently sterilize bacteria . Background technique [0002] Organic fungicides have been used for many years as sludge control agents in pulp manufacturing. However, since various organic substances and reducing substances are contained in a large amount in the pulp manufacturing process, organic fungicides cannot obtain effective bactericidal effects due to decomposition due to redox reactions with them, and sufficient sludge control may not be possible . This situation becomes a big problem especially in the pulp manufacturing process which uses as a raw material the waste paper which contains many organic substances and may contain reducin...

Claims

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Application Information

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IPC IPC(8): D21H21/04C02F1/50C02F1/76D21C5/02
CPCD21H17/11D21H17/07D21H17/66C02F1/76D21H21/36C02F2103/28C02F2303/04
Inventor 日高胜彦
Owner KURITA WATER INDUSTRIES LTD
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