Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Biochemical-method ECF (Extracellular Fluid) bleaching process for KP (Kraft Pulp) of fast growing poplars

A biochemical, fast-growing poplar technology, applied in the field of bleaching technology, can solve the problems of low pulping strength, poor brightness stability, and high energy consumption for refining

Active Publication Date: 2013-10-09
QILU UNIV OF TECH
View PDF2 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 whiteness stability, and easy yellowing, which makes it difficult to make some paper products from high-yield pulp. High strength, not easy to yellow, good thermal stability paper

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Biochemical-method ECF (Extracellular Fluid) bleaching process for KP (Kraft Pulp) of fast growing poplars
  • Biochemical-method ECF (Extracellular Fluid) bleaching process for KP (Kraft Pulp) of fast growing poplars
  • Biochemical-method ECF (Extracellular Fluid) bleaching process for KP (Kraft Pulp) of fast growing poplars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Process optimization of xylanase treatment of fast-growing poplar kraft pulp

[0037]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 xyla...

Embodiment 2

[0106] The optimization of embodiment 2 bleaching process conditions

[0107] 2.1.1 Raw materials

[0108] 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%.

[0109] 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.

[0110] 2.1.2 Cooking experiment

[0111] 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Widthaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a biochemical-method ECF (Extracellular Fluid) bleaching process for KP (Kraft Pulp) of fast growing poplars. The process is characterized by comprising the following steps of: (1) cooking: putting fast growing poplar wood chips into a cooking pot for cooking so as to obtain primary pulp, then, washing and screening so as to obtain paper pulp; (2) carrying out pretreatment by using xylanase; and (3) bleaching ECF: the bleaching of the paper pulp subjected to enzyme treatment comprises the steps of: firstly, carrying out oxygen delignification or intensified oxygen delignification on the paper pulp subjected to enzyme treatment; washing the paper pulp after the oxygen delignification is ended, and then, carrying out D-section chlorine dioxide bleaching; washing the paper pulp after the D-section chlorine dioxide bleaching is ended, and then, carrying out E-section treatment; and washing the paper pulp after the E-section treatment is ended, and then, carrying out second D-section treatment. According to the process, an ODED bleaching sequence is adopted to carry out bleaching, the paper pulp with higher whiteness and viscosity is obtained, and the whiteness of the bleached pulp reaches 88.1% ISO to the maximum and reaches 87.6% ISO to the minimum in the case that the total consumption of ClO2 is 1%; and the whiteness of the ODED-bleached pulp is 85.1% ISO.

Description

technical field [0001] The invention relates to a KP 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-gr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): D21C9/00D21C9/10D21C9/14D21C9/147
Inventor 陈嘉川吉兴香杨桂花田中建
Owner QILU UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com