Accessory ingredient used for bleaching slurry oxygen delignification and application thereof

Oxygen delignification and pulping technology, applied in fiber raw material processing, cellulose pulp post-processing, papermaking, etc., can solve the problems of poor effect, affecting the improvement of whiteness of bleached pulp, high interfacial tension, etc., to achieve Improve the rate of penetration and uniform diffusion, improve lignin removal rate, and reduce production cost

Active Publication Date: 2012-12-12
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the single chemical composition of magnesium sulfate or sodium tripolyphosphate, the effect is not good, and they cannot play a good role in lignin removal.
At the same time, in the process of oxygen delignification, due to the poor water solubility of oxygen and the high interfacial tension of gas, liquid and solid, the reaction between oxygen and lignin is uneven, which will cause uneven lignin removal and affect subsequent bleaching. Improvement of pulp whiteness

Method used

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  • Accessory ingredient used for bleaching slurry oxygen delignification and application thereof
  • Accessory ingredient used for bleaching slurry oxygen delignification and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 5kg of sodium dodecylbenzenesulfonate, 10kg of sodium lignosulfonate, 15kg of anthraquinone derivatives, 65kg of sodium sulfite, and 5kg of sodium tripolyphosphate. Among them, the manufacturer of anthraquinone derivatives is Chongqing Leapfrog (Group) Hunan Xiangyu Chemical Co., Ltd., a subsidiary of the company. Mix the above components uniformly at room temperature for no less than 30 minutes to form the oxygen bleaching aid.

[0027] Get the unbleached bamboo pulp of slurry concentration 10%, pass into the oxygen of oxygen pressure 0.5MPa, the quality that adds NaOH accounts for 2.5% of slurry dry weight, adds and accounts for the auxiliary agent of 0.1% of slurry dry weight, in At a temperature of 105°C, react for 60 minutes. The bamboo pulp used in this example is self-made, the kappa number of the raw pulp is 21.7, the viscosity of the slurry is 1184ml / g, and the whiteness of the slurry is 27.4%ISO.

[0028] The relevant measurement results are as follows...

Embodiment 2

[0030] Weigh 15kg sodium dodecylbenzenesulfonate, 20kg sodium lignosulfonate, 20kg anthraquinone derivatives, 30kg sodium sulfite, and 15kg sodium tripolyphosphate. Mix the above components uniformly at room temperature for no less than 30 minutes to form the oxygen bleaching aid.

[0031] Take unbleached bamboo pulp with a pulp concentration of 12%, feed it with oxygen at an oxygen pressure of 0.5MPa, add NaOH so that the quality of NaOH accounts for 2.0% of the dry weight of the pulp, and add 0.7% of the auxiliary agent of the dry weight of the pulp , at a temperature of 95°C, react for 60min. The bamboo pulp used in this example is self-made, the kappa number of the raw pulp is 21.7, the viscosity of the slurry is 1184ml / g, and the whiteness of the slurry is 27.4%ISO.

[0032] The relevant measurement results are as follows: Kappa value 9.68, pulp viscosity 1063ml / g, pulp whiteness 45.2%ISO, viscosity reduction rate 10.2%, lignin removal rate 55.4%.

Embodiment 3

[0034] Weigh 10kg of sodium dodecylbenzenesulfonate, 15kg of sodium lignosulfonate, 10kg of anthraquinone derivatives, 55kg of sodium sulfite, and 10kg of sodium tripolyphosphate. Among them, the manufacturer of anthraquinone derivatives is Chongqing Leapfrog (Group) Hunan Xiangyu Chemical Co., Ltd., a subsidiary of the company. Mix the above components uniformly at room temperature for no less than 30 minutes to form the oxygen bleaching aid. When in use, weigh the oxygen bleaching aid according to the percentage of the dry weight of the slurry, dissolve the weighed oxygen bleaching aid in the oxygen bleaching alkaline solution, and pump it into the slurry together to complete the addition of the aid.

[0035] The auxiliary agent prepared by different consumption embodiment 3 is used for the oxygen delignification of bamboo pulp:

[0036] The unbleached bamboo pulp used in this experiment was taken from Sichuan Yongfeng Pulp and Paper Co., Ltd., the kappa number of the raw p...

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Abstract

The invention discloses an accessory ingredient used for bleaching slurry oxygen delignification, which aims to solve the problems that the traditional oxygen delignification technology adopts magnesium sulfate or sodium tripolyphosphate as fiber protection accessory ingredient to cause single chemical component and poor action effect, and can not perform good delignification action, and the improvement of the whiteness of the subsequent bleaching slurry is affected due to uneven reaction of oxygen and lignin. The accessory ingredient comprises the following components in percentage by weight: 5-15% of sodium dodecyl benzene sulfonate, 3-20% of sodium lignosulphonate, 5-25% of anthraquinone derivative, 25-65% of sodium sulfite and 1-15% of sodium tripolyphosphate. The accessory ingredient disclosed by the invention is compounded by various components, the delignification rate, the slurry yield and the slurry whiteness can be effectively improved, and the fiber is prevented from being degraded. Meanwhile, the use amount of bleaching agent in the subsequent bleaching process is effectively reduced, pollution on the environment by bleaching waste water is lowered, and the accessory ingredient has a higher economic value and a higher use value.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to an auxiliary agent for pulp oxygen delignification bleaching and its application. Background technique [0002] In recent years, with the development of social economy and the continuous improvement of environmental protection awareness, the paper industry has also paid more attention to environmental protection. Therefore, more and more papermaking enterprises adopt total chlorine-free (TCF) bleaching or elemental chlorine-free (ECF) bleaching when building or rebuilding pulping and bleaching production lines. TCF bleaching and ECF bleaching are more friendly to the environment and are an inevitable choice for the paper industry to take the road of sustainable development. Oxygen delignification is an indispensable and important part of TCF bleaching, and also an important part of most ECF bleaching, which is the development direction of pulp bleaching technology. While the country ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/147
Inventor 李文俊杨玲
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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