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Method for producing paper pulp used in rice paper production by broussonetia papyrifera bark through steam-exploding degumming

A stem bark and steam explosion technology, applied in the field of high-quality pulp, can solve the problems of polluting the environment and energy consumption, and achieve the effects of avoiding environmental pollution, improving yield and quality, and broad economic prospects

Inactive Publication Date: 2009-07-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] [Purpose of the present invention] The purpose of the present invention is to provide a clean pulping process for the degumming of the bark of the bark by steam explosion, aiming at the disadvantages of the chemical pulping process of the bark of the bark that pollutes the environment and high energy consumption

Method used

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  • Method for producing paper pulp used in rice paper production by broussonetia papyrifera bark through steam-exploding degumming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) steam explosion: carry out steam explosion treatment to the bark of the collected mulberry stems under a pressure of 0.8MPa for 5 minutes;

[0019] (2) steam-exploded stem bark rinsing: the steam-exploded raw material is rinsed with 10 times of water to remove degraded pectin, hemicellulose, lignin and black components of the outer cortex of the tree;

[0020] (3) Stem bark bleaching by steam explosion: two-stage bleaching technology is adopted, and the composition of the first-stage bleaching solution is: 1% Na 2 SiO 3 , 2% H 2 o 2 , 2% NaOH, the composition of the second bleaching solution is: 1% Na 2 SiO 3 , 1% H 2 o 2 , 1% NaOH, all at 70°C, bleach for 2 hours each, solid-liquid ratio: 1 / 15;

[0021] The pulp yield is 43.2% of the dry weight of the stem bark of the tree, and the pulp can be used to make high-grade paper such as rice paper and banknote printing paper.

Embodiment 2

[0023] (1) Steam explosion: carry out steam explosion treatment to the bark of the collected mulberry stems under a pressure of 1.0MPa for 3 minutes;

[0024] (2) steam-exploded stem bark rinsing: the steam-exploded raw material is rinsed with 8 times of water to remove degraded pectin, hemicellulose, lignin and black components of the outer cortex of the tree;

[0025] (3) Stem bark bleaching by steam explosion: two-stage bleaching technology is adopted, and the composition of the first-stage bleaching solution is: 1% Na 2 SiO 3 , 2% H 2 o 2 , 2% NaOH, the composition of the second bleaching solution is: 1% Na 2 SiO 3 , 1% H 2 o 2 , 1% NaOH, all bleached at 60°C for 3 hours, solid-liquid ratio: 1 / 15;

[0026] The pulp yield is 44.1% of the dry weight of the stem bark of the tree, and the pulp can be used to make high-grade paper such as rice paper and banknote printing paper.

Embodiment 3

[0028] (1) steam explosion: the collected bark of the mulberry tree was subjected to steam explosion treatment under a pressure of 1.2MPa for 2min;

[0029] (2) steam-exploded stem bark rinsing: the steam-exploded raw material is rinsed with 9 times of water to remove degraded pectin, hemicellulose, lignin and black components of the outer cortex of the tree;

[0030] (3) Stem bark bleaching by steam explosion: two-stage bleaching technology is adopted, and the composition of the first-stage bleaching solution is: 1% Na 2 SiO 3 , 2% H 2 o 2 , 2% NaOH, the composition of the second bleaching solution is: 1% Na 2 SiO 3 , 1% H 2 o 2 , 1% NaOH, all at 55°C, bleach for 2 hours each, solid-liquid ratio: 1 / 3;

[0031] The pulp yield is 42.2% of the dry weight of the stem bark of the tree, and the pulp can be used to make high-grade paper such as rice paper and banknote printing paper.

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Abstract

The invention belongs to the field of phloem fiber resource utilization, in particular relates to a method for preparing high-quality paper pulp such as rice paper and the like by steam-explosion, degumming and cleaning of broussonetia papyrifera bark. The method comprises the steps as follows: firstly, the steam-explosion treatment of the broussonetia papyrifera bark is carried out; subsequently, rinsing and bleaching are carried out, thus obtaining the high-quality paper pulp. The no-pollution steam-explosion treatment degrades 80% of the pectin and hemicellulose and part of the lignin in the broussonetia papyrifera bark fiber, completely separates the external epidermis (black skin) of the broussonetia papyrifera from the internal layer phloem thereof simultaneously, and removes the black tissue of the external epidermis by the bleaching; furthermore, during the steam-explosion process, the bark fiber is torn to a loose structure, which leads the chemical drug to sufficiently permeate during the bleaching process and improves the whiteness of the paper pulp. The method reduces the industrial cost of the papermaking by broussonetia papyrifera bark, avoids the environmental pollution caused by chemical pulp preparation process and can improve the yield and quality of the paper pulp; and the paper pulp can be used for preparing high-quality paper such as rice paper, bank paper and the like. The invention provides a new method for clean high-value utilization of the broussonetia papyrifera bark resource and generates greater economic and social benefits.

Description

technical field [0001] The invention belongs to the field of bast fiber utilization, in particular to a method for preparing high-quality paper pulp such as rice paper through steam explosion degumming and cleaning of stem bark of mulberry tree. technical background [0002] Paper tree, also known as mulberry tree, mulberry tree, sandpaper tree, grain wood, and grain pulp tree, is a perennial deciduous tree of the family Moraceae, with a height of up to 16 meters. The bast fiber of mulberry tree is much thinner than hemp, and has high strength and good toughness. As a special long fiber raw material in my country, it is mainly used to produce various high-grade special papers. Since Cai Lun, mulberry has become an excellent raw material for making high-quality paper, so the ancients called paper "Mr. Chu" or "Chu". With the development of the times, mulberry is gradually widely used in the manufacture of various paper types such as newsprint, gift wrapping paper, and rice p...

Claims

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Application Information

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IPC IPC(8): D21C3/00D21B1/36D21C9/02D21C9/08D21C9/16
Inventor 陈洪章彭小伟张作仿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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