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ECF bleaching technology of fast growing poplar by NaOH-AQ pulp biochemical method

A biochemical, fast-growing poplar technology, applied in pulp bleaching, cellulose pulp post-treatment, textiles and papermaking, etc., can solve problems that have not yet achieved large-scale application

Active Publication Date: 2014-08-06
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many studies on the application of xylanase in the bleaching of hardwood kraft pulp, and some industrialization has been realized abroad, but large-scale application has not yet been realized in China.
At the same time, there are few reports on the technology and mechanism of xylanase used in sodium hydroxide anthraquinone pulp bleaching

Method used

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  • ECF bleaching technology of fast growing poplar by NaOH-AQ pulp biochemical method
  • ECF bleaching technology of fast growing poplar by NaOH-AQ pulp biochemical method
  • ECF bleaching technology of fast growing poplar by NaOH-AQ pulp biochemical method

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Effect test

Embodiment 1

[0032] Example 1 Process optimization of xylanase treatment of fast-growing poplar NaOH-AQ pulp

[0033] There are many studies on the assisted bleaching of hardwood KP pulp by xylanase, and good results have been achieved. According to relevant literature, the main factors affecting the treatment of pulp with xylanase are enzyme dosage, temperature, pH value and time, etc. These factors have varying degrees of influence on the effect of oxygen delignification and subsequent bleaching. At present, since the research on xylanase in the bleaching of fast-growing poplar NaOH-AQ pulp is rarely reported, it is necessary to explore the most suitable process conditions for pretreatment of fast-growing poplar NaOH-AQ pulp with different xylanase preparations, and use a variety of modern instruments It is of great innovative and practical significance to explore the bleaching-assisting mechanism of the new xylanase on NaOH-AQ pulp of fast-growing poplar by using analytical means.

[0...

Embodiment 2

[0107] Example 2 Optimization of bleaching process conditions

[0108] 2.1.1 Raw materials

[0109] The fast-growing poplar chips used in the experiment were mixed fast-growing poplar chips, which were obtained from Shandong Sun Paper Co., Ltd. The length of the wood chips is 15-25mm, the width is 10-20mm, and the thickness is 3-5mm. The qualified rate of the wood chips is over 90%.

[0110] Xylanase X 1 Provided by Novozymes, liquid, without cellulase activity; xylanase X 2 、X 3 All are provided by Shenzhen Lvweikang Biological Co., Ltd., all are white powdery solids, and none of them contain cellulase activity.

[0111] 2.1.2 Cooking experiment

[0112] Cook in a 15L electric heating rotary cooking pot to obtain fast-growing poplar sodium hydroxide anthraquinone puree. The cooking conditions are: the amount of alkali used is 22% (for absolute dry raw materials, based on NaOH), the amount of AQ is 0.05%, the liquid ratio is 1:4, the highest cooking temperature is 165°C,...

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Abstract

The invention discloses an ECF bleaching technology of fast growing poplar by a NaOH-AQ pulp biochemical method. The technology provided by the invention is characterized by comprising the following steps: (1) steaming: taking fast growing poplar chips, stewing the fast growing poplar chips in a digester to obtain virgin pulp, washing and screening to obtain paper pulp; (2) xylanase pretreatment; and (3) ECF bleaching: bleaching the above paper pulp which has undergone enzyme treatment, wherein the bleaching process is ODED and comprises steps of: oxygen delignification or reinforced oxygen delignification is firstly carried out on the paper pulp which has undergone enzyme treatment; after oxygen delignification, the paper pulp is washed and D-stage chlorine dioxide bleaching is then carried out; after D-stage chlorine dioxide bleaching, the paper pulp is washed and then E stage is performed; and after E stage, the paper pulp is washed and secondary D stage is carried out. According to the invention, xylanase is used to pretreat the paper pulp, and then bleaching is performed by the ODED bleaching process so as to obtain the paper pulp with higher whiteness and viscosity. Under the condition that the total dosage of ClO2 is 1%, the whiteness of bleached pulp reaches up to 88.6% ISO as the highest level and to 88.1% ISO as the lowest level.

Description

technical field [0001] The invention relates to a NaOH-AQ pulp biochemical ECF bleaching process of fast-growing poplar, belonging to the technical field of papermaking. Background technique [0002] Due to the production of odorous gases such as hydrogen sulfide, methyl mercaptan, methyl sulfide and dimethyl sulfide in the process of kraft pulping and alkali recovery, there are problems of pollution and air odor around the production unit. Therefore, in the open pulping production process of some medium-sized pulp mills, the pulping technology based on the sodium hydroxide anthraquinone method is adopted. Because the chemical used in sodium hydroxide anthraquinone pulping is mainly sodium hydroxide, which also contains a small amount of anthraquinone as a cooking protective agent, these two chemicals are non-toxic and odorless, and no odor is produced during the pulping and cooking process Therefore, this alkaline pulping technology is widely used in some batch cooking pul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/00D21C9/10D21C9/14
Inventor 吉兴香田中建陈嘉川杨桂花
Owner QILU UNIV OF TECH
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