CN110747682A - Chlorine-free bleaching method for rice paper straw pulp - Google Patents
Chlorine-free bleaching method for rice paper straw pulp Download PDFInfo
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- CN110747682A CN110747682A CN201910949448.0A CN201910949448A CN110747682A CN 110747682 A CN110747682 A CN 110747682A CN 201910949448 A CN201910949448 A CN 201910949448A CN 110747682 A CN110747682 A CN 110747682A
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- bleaching
- straw pulp
- rice paper
- pulp
- chlorine
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
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- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
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Abstract
The invention belongs to the field of rice paper manufacturing, and particularly relates to a chlorine-free bleaching method for rice paper straw pulp, which directly bleaches the straw pulp before concentration; the bleaching is carried out by putting rice paper straw pulp and bleaching agent into a reaction kettle for bleaching, wherein the technological parameters in the reaction kettle are as follows: 4-6% of sodium hydroxide, 4-6% of magnesium sulfate, 1.5-2.5% of hydrogen peroxide, 1.3-1.8% of water glass, 3-5% of pulp concentration, 95-105 ℃ of temperature and 2-3 h of residence time. By adopting the scheme of the invention, on the basis of ensuring high bleaching efficiency, the toughness of the illegible fibers can be kept, so that the quality of the Chinese art paper product is ensured; high oxygen pressure and high bleaching temperature are not needed in the bleaching process, and the requirement on process equipment is lower.
Description
Technical Field
The invention belongs to the field of rice paper manufacturing, and particularly relates to a chlorine-free bleaching method for rice paper straw pulp.
Background
The Xuan paper is the traditional Chinese paper for painting and calligraphy, has white, fine, light and thin texture, good ink moistening property, water absorption and flexibility, is strong in pen ink, distinct in level and long in storage time, and is deeply favored by ink customers of ancient and modern civilians. The production process of the rice paper mainly comprises the steps of material preparation, pulping, paper fishing, plate pressing, drying, paper cutting and the like, wherein the pulping comprises sandalwood bark pulp and straw pulp, and the sandalwood bark pulp is prepared by bleaching the wingceltis tree bark after a series of pretreatment including alkali steaming, washing, selecting and the like. Wherein, the bleaching of straw pulp is one of the important processes in the production process of rice paper.
In the prior art, the bleaching process of the rice paper pulp is mostly carried out by adding chlorine-containing bleaching agent for rinsing, for example, the production process and quality inspection of the rice paper pulp, Chenbiao and the like, the university of Guangxi nationality (Nature science edition) No. 11 months 2010, volume 16, No. 4, pages 17-20, which is Ca (ClO) with effective chlorine content of above 52g/L2The solution is bleaching liquid, and when the whiteness of the pulp meets the requirement, the pulp is washed clean and does not contain residual chlorine, so that the bleached pulp is obtained. The straw pulp bleaching process requires a large amount of water to wash the pulp, so a large amount of chlorine-containing wastewater is generated, the difficulty is increased for wastewater treatment, and the treatment cost is also increased.
In order to reduce the production of waste water, an oxygen-alkali pulping process is developed, for example, the research on new processes of rice paper and straw pulp, the research institute of forestry and technology, university of Anhui agriculture university, Pan Zhan, 2 months 2006, and the pulp bleaching process in the literature is as follows: oxygen pressure (0.3MPa) → temperature (110-120 ℃) → time (1.5-2 hours), and after rinsing, the whiteness degree is not enough, and the slurry needs to be replenished and washed by a calcium hypochlorite solution, and although the amount of the chlorine-containing rinsing liquid used is much smaller than that of the former scheme, the generated chlorine-containing waste water needs to be treated at a certain cost. More importantly, as the raw material for preparing the Chinese art paper, the poor toughness and the strength are far inferior to those of the sandalwood skin, and the poor toughness of the sloppy fiber is difficult to be reserved under the process of high oxygen pressure and high bleaching temperature.
When the rice paper production enterprises bleach the straw pulp, the straw pulp to be bleached is concentrated, the concentration of the straw pulp is concentrated from 3-5% to 10-12% or even higher, and then the chlorine-containing bleaching agent is added for bleaching, so that the amount of chlorine-containing wastewater can be reduced.
Therefore, as rice paper manufacturing enterprises, research on new straw pulp bleaching methods is still needed to meet the requirements of rice paper products on the performance of raw materials.
Disclosure of Invention
The invention aims to provide a chlorine-free bleaching method of rice paper straw pulp, which can greatly reduce the amount of wastewater produced, does not need oxygen pressure or concentration, thereby reserving the toughness of poor rice paper raw material straw pulp and being suitable for the bleaching treatment of the rice paper making raw material straw pulp.
In order to achieve the purpose, the invention adopts the technical scheme that: a chlorine-free bleaching method for rice paper straw pulp directly bleaches the straw pulp before concentration; the bleaching is carried out by putting rice paper straw pulp and bleaching agent into a reaction kettle for bleaching, wherein the technological parameters in the reaction kettle are as follows: 4-6% of sodium hydroxide, 4-6% of magnesium sulfate, 1.5-2.5% of hydrogen peroxide, 1.3-1.8% of water glass, 3-5% of pulp concentration, 95-105 ℃ of temperature and 2-3 h of residence time.
By adopting the scheme, the low-concentration straw pulp is directly bleached without concentrating the straw pulp, so that the uneven bleaching caused by uneven stirring is avoided, and the investment of equipment required by concentration is reduced; moreover, the stirring difficulty is reduced, and the concentration of hydrogen peroxide can be properly increased so as to improve the bleaching efficiency; the magnesium sulfate and the sodium silicate are mutually matched, so that the sloppy fiber is protected, the decomposition rate of hydrogen peroxide can be slowed down, and the uniformity of the bleaching effect of the straw pulp fiber can be still ensured under the condition of high-concentration hydrogen peroxide; the generated wastewater does not contain chlorine and does not generate the hazard of chloride ion deposition, so the wastewater can be directly added into a reflux system for recycling, the water resource is saved, and the bleaching sequence is shortened. By adopting the scheme of the invention, on the basis of ensuring high bleaching efficiency, the toughness of the illegible fibers can be kept, so that the quality of the Chinese art paper product is ensured; high oxygen pressure and high bleaching temperature are not needed in the bleaching process, and the requirement on process equipment is lower.
Detailed Description
The technical solution of the present invention is further described below with reference to examples.
A chlorine-free bleaching method for rice paper straw pulp is characterized in that straw pulp and a bleaching agent are directly placed in a reaction kettle for bleaching before the straw pulp is concentrated, and the process parameters in the reaction kettle are as follows: 5% of sodium hydroxide, 5% of magnesium sulfate, 2% of hydrogen peroxide, 1.5% of water glass, 4% of pulp concentration, 100 ℃ of temperature and 2 hours of residence time.
Wherein the magnesium sulfate is heptahydrate magnesium sulfate, and the water glass is 35% water solution. After rinsing, the performance of the sloppy fibers in the slobber is detected: hardness (HBW)3.5, whiteness 77.5%, and degree of polymerization 1075.
Claims (2)
1. A chlorine-free bleaching method of rice paper straw pulp is characterized in that: directly bleaching the concentrated straw pulp; the bleaching is carried out by putting rice paper straw pulp and bleaching agent into a reaction kettle for bleaching, wherein the technological parameters in the reaction kettle are as follows: 4-6% of sodium hydroxide, 4-6% of magnesium sulfate, 1.5-2.5% of hydrogen peroxide, 1.3-1.8% of water glass, 3-5% of pulp concentration, 95-105 ℃ of temperature and 2-3 h of residence time.
2. The chlorine-free bleaching method of rice paper straw pulp as claimed in claim 1, characterized in that: the technological parameters in the reaction kettle are as follows: 5% of sodium hydroxide, 5% of magnesium sulfate, 2% of hydrogen peroxide, 1.5% of water glass, 4% of pulp concentration, 100 ℃ of temperature and 4 hours of residence time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910949448.0A CN110747682A (en) | 2019-10-08 | 2019-10-08 | Chlorine-free bleaching method for rice paper straw pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910949448.0A CN110747682A (en) | 2019-10-08 | 2019-10-08 | Chlorine-free bleaching method for rice paper straw pulp |
Publications (1)
| Publication Number | Publication Date |
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| CN110747682A true CN110747682A (en) | 2020-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910949448.0A Pending CN110747682A (en) | 2019-10-08 | 2019-10-08 | Chlorine-free bleaching method for rice paper straw pulp |
Country Status (1)
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4938842A (en) * | 1986-08-20 | 1990-07-03 | Abitibi-Price Inc. | High consistency peroxide bleaching |
| CN1205375A (en) * | 1998-05-14 | 1999-01-20 | 华南理工大学 | Method for bleaching medium thick paper pulp by for hydrogen peroxide for medium-small paper mill |
| CN1341788A (en) * | 2001-09-25 | 2002-03-27 | 黄干强 | High-pressure hydrogen peroxide bleaching method of soda pulp |
| CN1786335A (en) * | 2005-12-09 | 2006-06-14 | 华南理工大学 | Process for bleaching wheat straw grass pulp by alkaline method |
| CN102002876A (en) * | 2010-09-17 | 2011-04-06 | 南开大学 | Chlorine-free and sulfur-free clean pulping method adopting grass raw materials |
-
2019
- 2019-10-08 CN CN201910949448.0A patent/CN110747682A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4938842A (en) * | 1986-08-20 | 1990-07-03 | Abitibi-Price Inc. | High consistency peroxide bleaching |
| CN1205375A (en) * | 1998-05-14 | 1999-01-20 | 华南理工大学 | Method for bleaching medium thick paper pulp by for hydrogen peroxide for medium-small paper mill |
| CN1341788A (en) * | 2001-09-25 | 2002-03-27 | 黄干强 | High-pressure hydrogen peroxide bleaching method of soda pulp |
| CN1786335A (en) * | 2005-12-09 | 2006-06-14 | 华南理工大学 | Process for bleaching wheat straw grass pulp by alkaline method |
| CN102002876A (en) * | 2010-09-17 | 2011-04-06 | 南开大学 | Chlorine-free and sulfur-free clean pulping method adopting grass raw materials |
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Application publication date: 20200204 |
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| RJ01 | Rejection of invention patent application after publication |