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Method for bleaching dendrocalamus giganteus chemical pulp

A technology of chemical pulp and big dragon bamboo, applied in pulp bleaching and other directions, can solve the problems of large strength loss and viscosity decrease, and achieve the effects of light waste water pollution, improved whiteness, and protection of strength performance.

Inactive Publication Date: 2012-07-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to achieve the same whiteness as elemental chlorine-free bleaching, the currently commonly used chlorine-free bleaching often results in a large decrease in viscosity and a large loss in strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the bleaching method of this Dalong bamboo chemical pulp, specific content is as follows:

[0024] In the embodiment, the Dalong bamboo chemical pulp is made of Dalong bamboo as a raw material, which is split into bamboo chips with a length of 15mm, a thickness of 3mm, and a width of 20mm; It is: liquid ratio 1:4.5, alkali amount 22% (calculated as NaOH), degree of sulfidation 22%, after idling the cooking pot for 10 minutes, it takes 45 minutes to raise the temperature from the initial temperature to 100°C, and then it takes 120 minutes to rise to 165°C, and at 165°C ℃ for 120min. After cooking, the bamboo chips are decomposed into fibers and placed in a 300-mesh nylon mesh pulp bag, washed with clean water until the washing water becomes clear and free of foam, and then the bamboo pulp fibers are screened with a sieve machine to extract the fiber raw materials for bleaching. The Dalong bamboo pulp with a Kappa value of 14.2 and a viscosity of 1220 enter...

Embodiment 2

[0033] Embodiment 2: the bleaching method of this Dalong bamboo chemical pulp, specific content is as follows:

[0034] In the embodiment, the Dalong bamboo chemical pulp is made of Dalong bamboo as a raw material, split into bamboo chips with a length of 15 mm, a thickness of 3 mm, and a width of 20 mm; the bamboo chips are screened and cooked in a ZQL electric cooking pot by the caustic soda method-anthraquinone method , the cooking conditions are: liquid ratio 1:4, alkali amount 20% (calculated as NaOH), and then add anthraquinone of 0.10% dry weight of the pulp. After the cooking pot is idling for 10 minutes, it takes 30 minutes to raise the temperature from the initial temperature to 85 ℃, and then Rise to 165°C over 70 minutes and keep at 165°C for 150 minutes. After cooking, the bamboo chips are decomposed into fibers and placed in a 300-mesh nylon mesh pulp bag, washed with clean water until the washing water becomes clear and free of foam, and then the bamboo pulp fiber...

Embodiment 3

[0043] Embodiment 3: the bleaching method of this Dalong bamboo chemical pulp, specific content is as follows:

[0044] In the embodiment, Dalong bamboo chemical pulp is made of Dalong bamboo as raw material, split into bamboo chips with a length of 15 mm, a thickness of 3 mm, and a width of 20 mm; The conditions are: liquid ratio 1:4, adding 18% ammonium sulfite, 5% urea and 0.15% anthraquinone in absolute dry mass of pulp, idling the cooking pot for 10 minutes, then raising the temperature from the initial temperature to 150°C for 140 minutes, and heating at 150 ℃ for 60 minutes, and then raised to 165 ℃ in 20 minutes, and kept at 165 ℃ for 120 minutes. After cooking, the bamboo chips are decomposed into fibers and placed in a 300-mesh nylon mesh pulp bag, washed with clean water until the washing water becomes clear and free of foam, and then the bamboo pulp fibers are screened with a sieve machine to extract the fiber raw materials for bleaching. The Dalong bamboo pulp wi...

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PUM

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Abstract

The invention discloses a method for bleaching dendrocalamus giganteus chemical pulp. By the method, the dendrocalamus giganteus chemical pulp serving as special wood assortment in Yunnan is subjected to clean chlorine-free bleaching in four steps. The method comprises the following steps of: 1, performing acidification chelating treatment; 2, bleaching by using deoxidized lignin intensified by hydrogen peroxide; 3, bleaching by using peracetic acid; and 4, bleaching by using the hydrogen peroxide. Paper pulp prepared by the method has the characteristics of high whiteness and high intensity and is low in wastewater pollution.

Description

technical field [0001] The invention belongs to the technical field of bamboo chemical pulp bleaching, in particular to a low-pollution bleaching method of Dalong bamboo chemical pulp. Background technique [0002] Dalong bamboo has an average fiber length of 2.72mm, an average width of 26.37μm, and an aspect ratio of 103.2. It is one of the bamboo species with the largest cultivation area, the widest range of uses, and the highest economic value in Yunnan Province. It has broad development and utilization prospects . Pulp bleaching plays an important role in the production process of pulp and paper, and is closely related to the quality of pulp and paper, the consumption of materials and energy, and the impact on the environment. With the increasingly stringent environmental protection requirements, the harm of chlorinated organic compounds contained in chlorine-containing bleaching wastewater to the environment has aroused widespread concern, and pulp bleaching is develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/10D21C9/16
Inventor 何洁陈杨陈克利
Owner KUNMING UNIV OF SCI & TECH
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