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Elemental chlorine free bleaching method for plant fiber stuff

A plant fiber and elemental chlorine technology is applied in the field of pulp bleaching to achieve the effects of reducing pollution, improving pulp strength and reducing environmental pollution

Active Publication Date: 2012-08-08
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN1065578C only found the final bleaching section suitable for chemical wood pulp, and did not involve the bleaching of straw pulp

Method used

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  • Elemental chlorine free bleaching method for plant fiber stuff
  • Elemental chlorine free bleaching method for plant fiber stuff
  • Elemental chlorine free bleaching method for plant fiber stuff

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Wheat straw raw materials are subjected to DqP bleaching after cooking, black liquor extraction, oxygen delignification, screening and purification. Main process conditions of section D: chlorine dioxide dosage 1.0%, end point pH 3.5, slurry concentration 10%, reaction temperature 35°C, reaction time 2h; Q section process conditions: chelating agent dosage 0.15%, pH 3.5, slurry The concentration is 5%, and the reaction time is 10 minutes; the main process conditions of the P section: H 2 o 2 The dosage is 3.0%, the end point pH is 11.5, the slurry concentration is 10%, the reaction temperature is 95°C, and the reaction time is 2h. After the reaction is completed, the pulp is washed to obtain bleached wheat straw pulp. The obtained bleached wheat straw pulp is quantitatively 60g / m 2 , the beating degree is 32°SR, the wet weight is 2.0g, the whiteness is 78.5%ISO, the breaking length is 6.1km, the folding resistance is 49 times, the tearing degree is 296mN, and the AOX...

Embodiment 2

[0043] The rice straw raw material is subjected to DqP bleaching after cooking, black liquor extraction, screening and purification. Main process conditions of section D: chlorine dioxide dosage 1.5%, end point pH 4, slurry concentration 5%, reaction temperature 35°C, reaction time 1.5h; process conditions of section Q: chelating agent dosage 0.2%, pH 5, slurry concentration 5% , the reaction time is 5min; the main process conditions of P section: H 2 o 2 The dosage is 4%, the end point pH is 11, the slurry concentration is 10%, the reaction temperature is 95°C, and the reaction time is 2h. After the reaction is completed, the pulp is washed to obtain bleached straw pulp. Gained bleached rice straw pulp is quantitatively 60g / m 2 , beating degree is 31°SR, wet weight is 1.8g, whiteness is 76.5%ISO, breaking length is 5.6km, folding endurance is 51 times, tearing degree is 280mN, AOX content in wastewater is 0.6-2kg / ton pulp.

Embodiment 3

[0045] Cotton stalk raw materials are subjected to DqP bleaching after cooking, black liquor extraction, screening and purification. Main process conditions of section D: dosage of chlorine dioxide 1.25%, end point pH 4, slurry concentration 5%, reaction temperature 40°C, reaction time 1.0h; process conditions of section Q: chelating agent dosage 0.2%, pH 4, slurry concentration 5% , the reaction time is 8min; the main process conditions of P section: H 2 o 2 The dosage is 4.5%, the end point pH is 11, the slurry concentration is 10%, the reaction temperature is 95°C, and the reaction time is 2h. After the reaction is completed, the slurry is washed to obtain bleached cotton stalk pulp. Gained bleached cotton stalk pulp quantitatively is 60g / m 2 , beating degree is 30°SR, wet weight is 2.1g, whiteness is 79.1%ISO, breaking length is 6.0km, folding endurance is 53 times, tearing degree is 302mN, AOX content in wastewater is 0.6-2kg / ton pulp.

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Abstract

The invention relates to an elemental chlorine free bleaching method. In the method, dioxin and AOX are removed from the source by adopting D section bleaching and P section bleaching. The straw pulp is bleached by adopting the elemental chlorine free bleaching method, so that the problem that wastewater obtained by bleaching by the chlorine-containing bleaching method is most severely polluted is solved; and the bleaching process is simple and practicable. Each index of the bleached stuff can be compared with that of broadleaf wood pulp.

Description

technical field [0001] The invention relates to a method for bleaching pulp, in particular to a method for bleaching plant fiber pulp without elemental chlorine. Background technique [0002] The development of my country's pulp bleaching technology is slow, especially the straw pulp bleaching technology still uses chlorine and hypochlorite bleaching. It has been proved that this kind of bleaching wastewater contains a series of organic halides including dioxin and AOX, which will cause great harm to human health and the environment. The pollution caused by chlorine bleaching is quite serious, which is far from meeting the requirements Environmental Protection Requirements for Limiting the Discharge of Organic Halides in Bleaching Wastewater. At present, the use of chlorine bleaching methods has been expressly banned internationally. Therefore, it is imminent to find a chlorine-free bleaching method suitable for straw pulp as soon as possible. [0003] CN1940176A disclose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/10
Inventor 李洪法宋明信毕衍金赵淑晶阎俊钦金艳彬
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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