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Method for preparing oxygen alkali pulping effect through cellulase pretreatment

A cellulase and pretreatment technology, applied in the field of pulping and papermaking, can solve the problems of low oxidative degradation viscosity and low pulp yield, etc., and achieve the effects of improving pulp strength properties, increasing pulp yield, and increasing yield.

Active Publication Date: 2017-12-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The peeling reaction of carbohydrates in the pulp obtained by the oxygen-alkali pulping method can be controlled, but the problems of low pulp yield, serious oxidative degradation and low viscosity need to be further solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the method that this cellulase pretreatment improves the pulping effect of oxygen-alkali method, specifically comprises the following steps:

[0021] (1) Mix the dry bagasse raw material with water evenly at a liquid ratio of 1:4, adjust the value to 6.5 with a dilute sulfuric acid solution with a concentration of 0.01mol / L, and then add cellulase 3U per gram of dry raw material Cellulase (commercially available endo-β-1,4-glucanase), reacted at 60°C for 150 minutes, and finally filtered through a 200-mesh filter to obtain pretreated raw materials, and recovered the enzyme solution for reuse;

[0022] (2) Dehydrating the pretreated bagasse raw material;

[0023] (3) Send the dehydrated raw materials in step (2) to the cooking equipment for oxygen-alkali pulping, and feed oxygen into the cooking equipment at room temperature, wherein the oxygen pressure is 0.5 MPa, raise the temperature to 90°C, and heat up The time is 50min, the holding time is 240min, an...

Embodiment 2

[0026] Embodiment 2: the method that this cellulase pretreatment improves the pulping effect of oxygen-alkali method, specifically comprises the following steps:

[0027] (1) Mix the dry bagasse material with water evenly according to the liquid ratio of 1:8, and use dilute Mg(OH) with a concentration of 0.15mol / L 2 The adjusted value of the solution is 7.5, and then add cellulase (commercially available endo-β-1,4 glucanase) at a rate of 2U of cellulase per gram of absolute dry raw material, react at 50°C for 360min, and finally use 300-mesh filter screen to obtain pre-treated raw materials;

[0028] (2) reusing the filtrate of step (1);

[0029] (3) Send the pretreated raw materials in step (2) after dehydration to the cooking equipment for oxygen-alkali pulping, and feed oxygen into the cooking equipment at room temperature, where the oxygen pressure is 0.8 MPa, and raise the temperature to 95°C. The heating time is 40min, the holding time is 200min, and the pulping condi...

Embodiment 3

[0032] Embodiment 3: the method that this cellulase pretreatment improves the pulping effect of oxygen-alkali method, specifically comprises the following steps:

[0033] (1) Mix the dry bagasse raw material with water evenly at a liquid ratio of 1:10, adjust the value to 8.5 with a dilute NaOH solution with a concentration of 0.5mol / L, and then add 0.2U of cellulase per gram of dry raw material Add cellulase (commercially available endo-β-1,4 glucanase), react at 20°C for 300 minutes, and finally filter through a 400-mesh filter to obtain pretreated raw materials, and recover the enzyme solution for reuse;

[0034] (2) Dehydrating the pretreated raw material obtained in step (1);

[0035] (3) Send the pretreated raw materials dehydrated in step (2) to the cooking equipment for oxygen-alkali pulping, and feed oxygen into the cooking equipment at room temperature, where the oxygen pressure is 0.9MPa, and raise the temperature to 100°C. The heating time is 70min, the holding ti...

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Abstract

The invention discloses a method for preparing an oxygen alkali pulping effect through cellulase pretreatment, and belongs to the technical field of pulping and paper making. The method comprises the following steps: pretreating raw materials with cellulase; and dehydrating the pretreated raw materials, and preparing paper pulp in a boiler by using an oxygen alkali boiling method. Under same oxygen alkali pulping conditions, compared with those of a control sample without enzyme treatment, the actual pulping yield of the method is increased by 1-5.5%, the kappa number of the paper pulp is reduced by 1-8 units, and the whiteness and the viscosity of the paper pulp are slightly increased; and under the condition of a similar pulping kappa number, the yield, the whiteness and the viscosity of oxygen alkali pulp treated with the cellulase are increased to certain extents.

Description

technical field [0001] The invention relates to a method for improving the effect of oxygen-alkali pulping by cellulase pretreatment, which belongs to the technical field of pulping and papermaking. Background technique [0002] Papermaking is one of the traditional light industry pillar industries in my country. With the development of the economy, the demand for high-quality paper products is increasing, and the traditional forest wood pulp plays an important role. However, promoting the harmonious development of man and nature and the coordinated development of economy, population, resources and environment are irresistible. To produce high-quality paper products while protecting forest resources, we should optimize the production process, reduce production costs, and at the same time adhere to green, environmental protection, and sustainable development. Therefore, the research on non-wood resources and the corresponding environmentally friendly pulp and paper technolog...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21C5/00D21C11/04
CPCD21C3/026D21C5/00D21C5/005D21C11/04
Inventor 孙兵梁星刘玉新张宝
Owner KUNMING UNIV OF SCI & TECH
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