ECF bleaching technology of fast growing poplar by sulfate pulp bio-chemical method

A kraft pulp and biochemical technology, applied in the field of papermaking, can solve the problems of high energy consumption for refining, poor whiteness stability, and easy yellowing, and achieve the effects of environmental protection, high pulp viscosity, and reduced consumption

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

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Problems solved by technology

[0003] In recent years, high-yield pulp has developed rapidly, but high-yield pulp has disadvantages such as high energy consumption for refining, low pulp strength, poor whit

Method used

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  • ECF bleaching technology of fast growing poplar by sulfate pulp bio-chemical method
  • ECF bleaching technology of fast growing poplar by sulfate pulp bio-chemical method
  • ECF bleaching technology of fast growing poplar by sulfate pulp bio-chemical method

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Experimental program
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Embodiment 1

[0034] Example 1 Process optimization of xylanase treatment of fast-growing poplar kraft pulp

[0035] Xylanase is a specific catalytic protein, which has strict requirements on the environment, that is to say, each enzyme has its specific and most suitable environmental conditions. Xylanase has achieved obvious effects in chemical pulping and bleaching pretreatment. According to relevant literature, the factors affecting xylanase pretreatment mainly include enzyme dosage, temperature, pH value and time, etc. These factors have varying degrees of influence on the effect of oxygen delignification and subsequent bleaching. Among these influencing factors, temperature and pH value are related to the characteristics of xylanase itself, but have relatively little influence on the properties of slurry. In this experiment, by changing the experimental conditions, the most suitable process conditions for pretreatment of fast-growing poplar kraft pulp were discussed with different xyl...

Embodiment 2

[0103] The optimization of embodiment 2 bleaching process conditions

[0104] 2.1.1 Raw materials

[0105] 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%.

[0106] 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.

[0107] 2.1.2 Cooking experiment

[0108] Cook in a 15L electric heating rotary cooking pot to obtain the raw material of fast-growing poplar sulfate. The conditions for cooking are: the amount of alkali used is 20% (for absolute dry raw materials, Na 2 O meter), the degree of sulfidation is 24%, the liquid ratio is 1:4, the highest cooking temperature ...

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Abstract

The invention discloses an ECF bleaching technology of fast growing poplar by a sulfate pulp bio-chemical method. The technology provided by the invention is characterized by comprising the following steps: (1) boiling: 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 one of three bleaching processes, namely ODQP, OPDQP or O1O2PDQP. According to the invention, xylanase is used to pretreat the paper pulp, and one of the three bleaching processes, namely ODQP, OPDQP or O1O2PDQP, is carried out for bleaching so as to obtain the paper pulp with higher whiteness and viscosity. In comparison with paper pulp which is directed bleached without xylanase pretreatment, the paper pulp produced by the ECF bleaching technology has the following advantages: beating whiteness loss is less, folding strength is averagely higher by 40 times, burst index is averagely higher by 0.45N.m.g<-1>, breaking length is averagely higher by 0.35KM, and tear index difference is very little.

Description

technical field [0001] The invention relates to a kraft pulp biochemical ECF bleaching process of fast-growing poplar, belonging to the technical field of papermaking. Background technique [0002] Fast-growing poplar is the main tree species used in forestry-paper integration construction in northern my country. It belongs to fast-growing broad-leaved wood. They have fast growth, strong adaptability, high natural whiteness, loose material, good absorption of liquid medicine, and relatively high lignin content. Low, high content of cellulose and hemicellulose, can be used to produce chemical pulp, semi-chemical pulp and mechanical pulp, etc., is one of the main high-quality papermaking raw materials in northern my country. Fast-growing poplar is widely planted in northern Europe, North America and northern my country. It includes many varieties, representative ones are black poplar, triploid poplar, and Zhonglin poplar. The growth characteristics and composition of these fast...

Claims

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Application Information

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IPC IPC(8): D21C9/14
Inventor 陈嘉川吉兴香杨桂花田中建刘玉王鲁燕
Owner QILU UNIV OF TECH
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