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Method for removing fluorescent substance in waste paper pulp

A waste paper pulp, fluorescent technology, applied in the field of bleaching treatment, can solve the problems of chemical waste, process energy consumption, no whitening effect, etc., to achieve the effect of saving investment, easy realization, energy and chemical saving

Inactive Publication Date: 2011-11-02
黑龙江省造纸研究所有限公司
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  • Abstract
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Problems solved by technology

[0013] The existing problem is that simply eliminating fluorescence, because there is no fluorescent whitening effect, the visual whiteness of the pulp after the elimination of fluorescence is significantly reduced, so that the whiteness increased by the previous bleaching effect is almost completely offset; this not only causes chemical The waste of products, but also because of the increased process consumes a lot of energy and increases the burden on the environment

Method used

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  • Method for removing fluorescent substance in waste paper pulp
  • Method for removing fluorescent substance in waste paper pulp
  • Method for removing fluorescent substance in waste paper pulp

Examples

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preparation example Construction

[0023] Chlorine dioxide preparation, commonly used preparation methods are:

[0024] ①, 5NaClO 2 +4HCl=4ClO 2 +5NaCl+2H 2 o

[0025] ②, NaClO 3 +2HCl=ClO 2 +1 / 2Cl 2 +NaCl+H 2 o

[0026] Methods ① and ② use NaClO 3 +HCl and NaClO 2 +HCl two reaction processes, the conversion rate of the raw material and the purity of the product are not high, and the reaction by-product Cl 2 It is not allowed by the environment.

[0027] The invention adopts novel chlorine dioxide preparation technology.

[0028] 2NaClO3+H 2 o 2 +H 2 SO 4 =2ClO 2 +O 2 +NaSO 4 +2H 2 o

[0029] The conversion rate of raw materials and the purity of products are high, and the reaction by-products are harmless to production and the environment. See figure 1 .

[0030] The present invention carries out bleaching and fluorescence removal simultaneously, and mainly comprises the following steps:

[0031] 1. Start the chlorine dioxide generator, continuously prepare chlorine dioxide online, and f...

Embodiment 1

[0037] 1. Waste paper pulp: mixed office waste paper, after deinking and bleaching

[0038] 2. Pulp concentration: 3.9%

[0039] 3. Reaction temperature: 35°C

[0040] 4. Reaction time: 30min

[0041] 5. The amount of chlorine dioxide and the reaction results are shown in the following table:

[0042]

[0043] It can be seen from the above table that when chlorine dioxide is used as a fluorescence remover to treat bleached waste paper pulp, a small amount of chlorine dioxide (0.88-1.93%) can reduce the fluorescence content of waste paper pulp from 23.27-24.33% to 2.12-4.54% . , but at the same time, due to the absence of fluorescence, the R457 whiteness of pulp also drops from 74.84 to 75.12% to 62.79 to 64.52%, which will affect the application of pulp (for example, it cannot be used on paper types that require higher whiteness) ).

[0044] Can only adopt technology of the present invention for this reason, is about to integrate the fluorescence removal of chlorine di...

Embodiment 2

[0046] 1. Waste paper pulp: mixed office waste paper, deinked and unbleached

[0047] 2. Pulp concentration: 7%

[0048] 3. Bleaching process

[0049] Original process: unbleached waste pulp→hydrogen peroxide bleaching→washing→testing brightness→FAS bleaching→washing→testing brightness

[0050] Invention process: unbleached waste paper pulp→chlorine dioxide bleaching→washing→testing brightness→hydrogen peroxide bleaching→washing→testing brightness

[0051] 4. The bleaching test results are shown in the table below:

[0052]

[0053] It can be seen from the above table that compared with the original process, the fluorescence content in the final pulp of the process of the present invention is reduced from the original 16.75% to 4.23%; and the brightness value is also 74.24%, which is not lower than the brightness of the original process of 73.65%.

[0054] It can be seen that the process of the present invention can well realize the dual effects of bleaching and fluoresce...

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Abstract

The invention provides a method for removing fluorescent substances in waste paper pulp, which relates to improvement of the waste paper pulping bleaching technology and more specifically to bleaching treatment on waste paper pulp using a chemical approach. The method can remove fluorescent substances in waste paper pulp. According to the invention, the processes of bleaching and fluorescence removal are carried out simultaneously; chlorine dioxide is used as a fluorescence remover to destroy luminophores and molecular structures of fluorescence, which not only radically eradicates fluorescence, but also eliminates influence of fluorescent substances on human health; chlorine dioxide also has an effect of bleaching, which compensates for and gets rid of the defect of decreased whiteness of paper pulp after removal of fluorescence; the method is in combined use with the waste paper bleaching technology to partially substitute conventional bleaching technology, which not only is easy to realize, but also saves investment and considerable energy and chemicals, producing the two effects of bleaching and fluorescence removal through a single technology.

Description

technical field [0001] The invention relates to the improvement of the bleaching process of waste paper pulping, in particular to a chemical method for bleaching waste paper pulp, which can eliminate fluorescent substances in the waste paper pulp. Background technique [0002] my country is a big country of paper production and consumption. According to the survey data of China Paper Association, in 2009, the national paper and cardboard production volume was 86.4 million tons, and the consumption volume was 85.69 million tons, surpassing the United States and ranking first in the world. With the rapid development of my country's paper industry, the total paper output has also increased rapidly. From 2000 to 2009, the average annual growth rate of paper and paperboard production was 12.27%. The demand for papermaking raw materials is also growing rapidly. In 2009, the total national pulp consumption was 79.8 million tons, of which wood pulp was 18.66 million tons, accounting...

Claims

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Application Information

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IPC IPC(8): D21C9/14D21C9/16D21C9/00
Inventor 刘慧枫彭庆华王连科
Owner 黑龙江省造纸研究所有限公司
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