High-white-degree bagasse paper pulp and environment-friendly pulp preparation process thereof

A high-brightness, bagasse-based technology, applied in pulp bleaching, cellulose pulp post-treatment, washing/replacing pulp treatment liquid, etc., can solve problems such as high viscosity of black liquor, difficulty in evaporation and alkali recovery, and impact on the environment

Inactive Publication Date: 2017-06-20
芜湖市哈贝纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, sugarcane pulping is mainly based on alkaline cooking. The traditional alkaline cooking has a low yield of pulp, and most of the silicon dissolves in the black liquor, resulting in high viscosity of the black liquor, difficulty in evaporation and alkali recovery, which seriously affects the environment, and the whiteness of the pulp is not good. High, unable to meet the production requirements of high whiteness paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of bagasse pulp with high brightness is produced by the following pulping process:

[0029] S1. Dedust and remove the pith from the air-dried bagasse, add distilled water 6 times the weight of the absolute dry bagasse, heat up to 120° C., keep warm for 30 minutes, filter, and take the filter bagasse to obtain pre-extracted bagasse;

[0030] S2, pre-extracting bagasse is packed into the digester, adding hydrogen peroxide, alkali and modified zeolite as cooking agent, the amount of hydrogen peroxide is 105% of the weight of pre-extracting bagasse, and the amount of alkali is the weight of pre-extracting bagasse The amount of zeolite is 1% of the pre-extracted bagasse weight, then add distilled water according to 4 times the pre-extracted bagasse weight, heat to 150 ° C, keep warm for 1.5h, and obtain the cooking material;

[0031] S3, cooling the cooking material, adding alkali, the amount of alkali is 1% of the weight of pre-extracted bagasse, and keeping the temp...

Embodiment 2

[0034] A kind of bagasse pulp with high brightness is produced by the following pulping process:

[0035] S1. Dedust and remove the pith from the air-dried bagasse, add distilled water 10 times the weight of the dry bagasse, heat up to 150° C., keep warm for 50 minutes, filter, and take the filter bagasse to obtain pre-extracted bagasse;

[0036] S2, pre-extracting bagasse is loaded into the digester, adding hydrogen peroxide, alkali and modified zeolite as cooking agent, the amount of hydrogen peroxide is 15% of the weight of pre-extracting bagasse, and the amount of alkali is the weight of pre-extracting bagasse The amount of zeolite is 5% of the pre-extracted bagasse weight, then add distilled water according to 8 times the pre-extracted bagasse weight, heat to 170 ° C, keep warm for 0.5h, and obtain the cooking material;

[0037] S3, cooling the cooking material, adding alkali, the amount of alkali is 1-5% of the weight of pre-extracted bagasse, and keeping the temperature...

Embodiment 3

[0040] A kind of bagasse pulp with high brightness is produced by the following pulping process:

[0041] S1. Dedust and remove the pith from the air-dried bagasse, add distilled water 8 times the weight of the absolute dry bagasse, heat up to 130° C., keep warm for 40 minutes, filter, and take the filter bagasse to obtain pre-extracted bagasse;

[0042] S2, pre-extracting bagasse is packed into a digester, adding hydrogen peroxide, sodium hydroxide and modified zeolite as a cooking agent, the amount of hydrogen peroxide is 13% of the weight of pre-extracting bagasse, and the amount of alkali is pre-extracting 15% of the weight of the bagasse, the amount of zeolite is 3% of the weight of the pre-extracted bagasse, and then add distilled water according to 6 times the weight of the pre-extracted bagasse, heat to 160 ° C, keep warm for 1 hour, and obtain the cooking material;

[0043] S3. Cool the cooking material, add sodium hydroxide, the amount of sodium hydroxide is 3% of th...

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Abstract

The invention discloses an environment-friendly pulping process for high-whiteness bagasse pulp, which comprises the following steps: S1, dedusting and removing pith from the air-dried bagasse, adding distilled water 6 to 10 times the weight of the dry bagasse, and raising the temperature to 120 to 100. 150°C, keep warm for 30-50 minutes, filter, take the filter residue to obtain pre-extracted bagasse; S2, put the pre-extracted bagasse into a digester, add hydrogen peroxide, alkali and modified zeolite as cooking agents, and heat to 150-170 Keep warm at ℃ to obtain the cooking material; S3, cool the cooking material, add alkali, keep warm at a temperature of 60-80°C to obtain a coarse slurry; S4, dilute the coarse slurry, wash and purify repeatedly, and then increase the concentration of the slurry to more than 20% to obtain high brightness bagasse pulp; the invention also discloses a high brightness bagasse pulp. The invention uses bagasse as raw material, adopts hot water extraction process, adds zeolite to improve bleaching efficiency, reduces production cost, improves pulp whiteness, and has reasonable preparation process and high efficiency.

Description

technical field [0001] The invention relates to the technical field of bagasse pulp, in particular to a high-whiteness bagasse pulp and an environmentally friendly pulping process thereof. Background technique [0002] Bagasse is a by-product of sugarcane sugar production. It can be used to make chemical pulp by conventional alkaline or kraft method. It is easy to boil and bleach, and has good pulp performance. The amount of chemicals used for cooking and bleaching is much less than that of wood. Bagasse pulp has a very mature black liquor alkali recovery technology. Since the fiber length of bagasse is 1.01-2.34 mm, which is equivalent to the fiber length of hardwood, the bagasse bleached chemical pulp is blended with certain long fibers to produce base paper that meets the quality indicators. At present, sugarcane pulping is mainly based on alkaline cooking. The traditional alkaline cooking has a low yield of pulp, and most of the silicon dissolves in the black liquor, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C1/02D21C7/00D21C9/02D21C9/16
CPCD21C1/02D21C7/00D21C9/02D21C9/163
Inventor 李先明
Owner 芜湖市哈贝纸业有限公司
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