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Preparation method for bamboo wood dissolving pulp

A technology for dissolving pulp and bamboo, which is used in cellulose raw material pulping, textile and papermaking, papermaking and other directions, and can solve the problems of low washing efficiency, large cellulose damage and poor effect.

Inactive Publication Date: 2013-07-24
CHONGQING LEE & MAN PAPER MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Disadvantages in cooking: Traditional intermittent or horizontal tube continuous cooking methods are used, the circulation of the liquid medicine and the contact uniformity with the flakes during the cooking process are not good enough, the alkali concentration of the cooking liquid changes from high to low during the cooking reaction, and the dissolved lignin content varies from high to low. Low to high, in the later stage of cooking, lignin is difficult to dissolve, in the process of deep delignification, the effect is not good, and the damage to cellulose is greater
It has a great impact on product quality, and the utilization rate of heat energy is relatively low. Insufficient in washing and screening: the traditional pulp washing process is adopted, and the process of pulp washing equipment is long. Before bleaching, 4 or more pulp washing equipment are usually required. The washing efficiency is relatively low
In the screening, the treatment of heavy impurities such as sand in the flakes is not enough, which has a certain impact on product quality
The sealing of washing and screening is poor, the odor in the production plant is obvious, and the production environment is relatively harsh
[0006] Disadvantages in bleaching: C-E-H traditional three-stage bleaching is mainly used, and the waste water pollution load generated by the bleaching process is large, and there is internationally recognized carcinogen dioxin.
The improved ECF bleaching, oxygen delignification adopts a one-stage method, which is not enough for deep delignification and protection of cellulose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] A preparation method of bamboo dissolving pulp, which comprises the following preparation steps: (a) material preparation, (b) cooking, (c) screening, (d) washing, (e) bleaching, and (f) papermaking.

[0076] The step (a) prepares materials specifically as follows:

[0077] Use a drum slicer to cut bamboo chips with a length of 13mm~25mm and a thickness of 3mm~5mm. The chips are classified by a double-layer classification sieve to screen out bamboo chips and unqualified chips. The qualified rate of the chips is ≥85. %. After the unqualified pieces are cut by the shredder, they are screened again. The qualified flakes are screened and passed through a flake washing machine, washed and dehydrated, and then sent to the flake stockyard for storage for later use. The main bamboo materials are Ci bamboo, yellow bamboo and hemp bamboo.

[0078] The step (b) cooking includes the following steps:

[0079] (b1) Steam heating; (b2) steam heating pre-hydrolysis; (b3) white liquor neutra...

Embodiment 2

[0111] The preparation method of bamboo dissolving pulp of this embodiment includes the following preparation steps: (a) material preparation, (b) cooking, (c) screening, (d) washing, (e) bleaching, and (f) papermaking.

[0112] The difference between this embodiment and Embodiment 1 is:

[0113] In the step (a), a drum slicer is used to cut the bamboo material with a length of 25mm-40mm and a thickness of 4mm-6mm.

[0114] Wherein, in the step (b2) steam heating and pre-hydrolysis, first use low-pressure steam to heat, and then use medium-pressure steam to heat, so that the temperature in the cooking pot reaches 173°C; the pressure range of the low-pressure steam is 0.5Mpa, and the pressure of the medium-pressure steam The pressure range is 1.0Mpa; the hydrolysis reaction is controlled by the P factor, and the range of the P factor is 550; the total time of steam heating and pre-hydrolysis is in the range of 120 minutes.

[0115] Wherein, the step (b3) white liquor is neutralized, an...

Embodiment 3

[0129] The preparation method of bamboo dissolving pulp of this embodiment includes the following preparation steps: (a) material preparation, (b) cooking, (c) screening, (d) washing, (e) bleaching, and (f) papermaking.

[0130] The difference between this embodiment and Embodiment 1 is:

[0131] In the step (a), a drum slicer is used to cut the bamboo material with a length of 40mm-50mm and a thickness of 6mm-7mm.

[0132] Wherein, in the step (b2) steam heating pre-hydrolysis, first use low-pressure steam to heat, and then use medium-pressure steam to heat, so that the temperature in the cooking pot reaches 175°C; the pressure range of low-pressure steam is 0.6Mpa, and the pressure of medium-pressure steam The pressure range is 1.3Mpa; the hydrolysis reaction is controlled by the P factor, and the range of the P factor is 600; the total time of the steam heating pre-hydrolysis is in the range of 130 minutes.

[0133] Wherein, the step (b3) white liquor is neutralized, and Na 2 In te...

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Abstract

The invention belongs to the technical field of bamboo wood dissolving pulp, and particularly relates to a preparation method for the bamboo wood dissolving pulp, which comprises the following preparation steps: (a) preparing a material; (b) cooking; (c) screening; (d) washing; (e) bleaching; and (f) manufacturing paper with the pulp. By adopting the preparation method for the bamboo wood dissolving pulp, the production efficiency and the product quality can be improved, simultaneously, the energy consumption, the chemical consumption and the pollution load are reduced, and the prepared bamboo wood dissolving pulp has high quality and high quality.

Description

technical field [0001] The invention belongs to the technical field of preparing bamboo dissolving pulp, and in particular relates to a preparation method of bamboo dissolving pulp. Background technique [0002] Dissolving pulp is a high-purity refined pulp, mainly used for the production of fiber derivatives such as textile viscose fiber, nitrocellulose, acetate fiber, cellophane, carboxymethyl cellulose, etc. Dissolving pulp has a wide range of uses, and the market demand larger. [0003] my country is rich in bamboo, which has many varieties and wide distribution, and has relatively rich bamboo forest resources, especially in the south, where bamboo is planted on a large scale in most areas, among which the bamboo forest resources in Sichuan, Hunan, Guangxi, Yunnan and Chongqing are the most Rich and concentrated, it has great economic development value. Bamboo dissolving pulp not only has similar or the same chemical and physical properties as cotton and wood dissolving...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/00
Inventor 李文俊
Owner CHONGQING LEE & MAN PAPER MFG
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