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

A biochemical, fast-growing poplar technology, used in pulp bleaching, post-processing of cellulose pulp, textiles and papermaking, etc., can solve problems such as large-scale applications that have not yet been realized

Active Publication Date: 2013-09-25
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

[0033] Xylanase has been widely studied in assisted bleaching of hardwood KP pulp, and good results have also been achieved. According to related literature, the main factors affecting the pulp treatment with xylanase are enzyme dosage, temperature, pH and time, etc. These factors have varying degrees of influence on the effect of oxygen delignification and subsequent bleaching. At present, as the research of xylanase in the bleaching of fast-growing poplar NaOH-AQ pulp is rarely reported, the most suitable process conditions for pretreatment of fast-growing poplar NaOH-AQ pulp with different xylanase preparations were explored, and a variety of modern instruments were used. Analytical methods to explore the bleaching mechanism of fast-growing poplar NaOH-AQ pulp by new xylanase have important innovation and practical significance.

[0034] The following discusses the effect of differ...

Example Embodiment

[0107] Example 2 Optimization of bleaching process conditions

[0108] 2.1.1 Raw materials

[0109] The fast-growing poplar chips used in the experiment are mixed fast-growing poplar chips, taken 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 above 90%. After the wood chips are retrieved from the stockyard, they are naturally air-dried to balance the moisture and reserved.

[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. They are all white powder solids, and none of them contain cellulase activity.

[0111] 2.1.2 Cooking experiment

[0112] It is cooked in a 15L electric heating rotary cooking pot to prepare the pure poplar sodium hydroxide anthraquinone slurry. The cooking conditions are: 22% of alkali (as NaOH for absolutely dry raw materials), 0.05% of AQ, ...

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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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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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