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Method for preparing dissolving pulp for viscose fiber by chemical pulp modification

A technology of viscose fiber and dissolving pulp, which is applied in the fields of cellulose raw material pulping, fiber raw material treatment, pulping with inorganic alkali, etc., can solve problems such as the influence of fiber reaction performance without mentioning, and achieve improved performance indicators, fiber Good reactivity and high α-cellulose content

Active Publication Date: 2016-01-13
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods do not address the influence of fiber reactivity, which is an important performance index for dissolving pulp.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Using bleached coniferous wood chemical pulp board as raw material [α cellulose content 83.4%, lignin content 1.2%, cellulose reactivity 33.4%, viscosity 911.3mL / g. Wherein the fiber reaction performance is detected by the Fock method (Enzyme and Microbial Technology 47 (2010) 355362), and other performance indicators are detected according to Chinese standards], added in the hydraulic pulper, and the pulp concentration is controlled to 10% (mass percentage), and the fibers are fully dispersed. Adjust the pH value to 5 with sulfuric acid with a mass percent concentration of 0.5%, add endoglucanase 100U / g dry pulp, and react at 50°C for 2h. After the reaction, the pulp has a concentration of 10% by mass, and the amount of sodium hydroxide is 9% of the absolute dry pulp, and is cooked at 105° C. for 1 hour. , the alpha fiber content in the obtained pulp is 92.1%, the lignin content is 0.2%, the cellulose reactivity is 69.3%, and the viscosity is 467mL / g.

Embodiment 2

[0018] Take bleached hardwood chemical pulp board as raw material (α cellulose content 80.2%, lignin content 1.3%, cellulose reactivity 35.2%, viscosity 814.5mL / g), add it to the hydraulic pulper, control the pulp concentration 3% , Fully disperse the fibers. Adjust the pH value to 5 with sulfuric acid with a concentration of 1% by mass, add endoglucanase 100U / g dry pulp, xylanase 100U / g dry pulp, and react at 50°C for 2h. Adding mass percentage concentration in the slurry after reaction is that 10% sodium hydroxide solution is mixed and is placed in twin-screw extruder, adopts twin-screw extruder extrusion process at 97 ℃, obtains outlet concentration and is 35% (mass percentage ) of the slurry. After treatment, put it in the heat preservation device to react for 2h. The α fiber content of the pulp was measured to be 91.5%, the lignin content to be 0.3%, the cellulose reactivity to be 70.3%, and the viscosity to be 456mL / g.

Embodiment 3

[0020] Take bleached bamboo dissolving pulp as raw material (88.2% α-cellulose content, 0.3% lignin content, 68.8% cellulose reactivity, viscosity 499.7mL / g), add it to the hydropulper, control the concentration 8%, fully Disperse fibers. Adjust the pH value to 5 with sulfuric acid, add endoglucanase 200U / g dry pulp, and control the temperature at 50°C, and react for 2h. The α fiber content of the pulp is 90.2%, the lignin content is 0.3%, the cellulose reactivity is 78.2%, and the viscosity is 487.2mL / g.

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Abstract

The invention relates to the field of chemical fibers, in particular to a preparation method for dissolving pulp used for a viscose fiber through modification of chemical pulp. The method comprises the following steps: fully dispersing a chemical pulp board and regulating the pH value of obtained slurry after dispersing to allow the pH value of the slurry to be neutral; and then adding an enzyme preparation, carrying out a reaction at a temperature of 45 to 55 DEG C for 1 to 4 h and subjecting the reacted slurry to alkali cooking or to extrusion in the presence of an alkali so as to obtain the dissolving pulp for the viscose fiber, wherein the enzyme preparation is one or more selected from the group consisting of endoglucanase, xylanase and laccase. The method provided by the invention has a simple process and needs low investment; and the prepared dissolving pulp has high alpha cellulose content and good fiber reaction performance.

Description

technical field [0001] The invention relates to the field of chemical fibers, in particular to a method for preparing dissolving pulp for viscose fiber by modifying chemical pulp. Background technique [0002] my country is the world's largest producer of textiles and clothing, and has a strong market dependence on chemical fiber raw materials. With the increasing scarcity of oil resources, the market demand for natural biomass fibers that can replace synthetic fibers is increasing. However, the market price of raw biomass fiber represented by cotton fiber has been increasing year by year due to the decrease in the supply of cotton. Dissolving pulp has attracted more and more attention. [0003] The dissolving pulp major part in my country's market is to be that raw material is produced (CN1247250A, CN101368295A, CN101565906A etc.) Although these methods have good pulp quality, the process is loaded down with trivial details and the investment in equipment is large. On th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C3/22D21C5/00
Inventor 王海松牟新东吴可佳刘超于光刘振王晓燕
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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