CN103882760A - Method for reducing polymerization degree in process of producing pulp through linters - Google Patents
Method for reducing polymerization degree in process of producing pulp through linters Download PDFInfo
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- CN103882760A CN103882760A CN201410050100.5A CN201410050100A CN103882760A CN 103882760 A CN103882760 A CN 103882760A CN 201410050100 A CN201410050100 A CN 201410050100A CN 103882760 A CN103882760 A CN 103882760A
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- acid
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Abstract
The invention provides a method for reducing polymerization degree in process of producing pulp through linters. The method comprises the following steps: treating the linters, bleaching and washing after bleaching, wherein an acid treatment step is arranged before or after the bleaching process, an acid treatment agent used in the acid treatment step is at least one acid, the amount of the acid treatment agent is 0.5-10 weight percent, the treatment temperature is 20-180 DEG C, the treatment time is 0.5-10 hours, the concentration of paper pulp is 3-30 weight percent; the amount of the acid treatment agent is inversely proportional to the treatment temperature; the amount of the acid treatment agent is inversely proportional to the treatment time; the treatment temperature is inversely proportional to the treatment time. The invention relates to the technical field of pulp for adhesive fibers, and the problems that the energy consumption in the process of reducing the fiber polymerization degree is high, the productivity is low, the treatment difficulty of black liquor is high and the water treatment cost is high in the prior art are solved.
Description
Technical field
The present invention relates to viscose fiber pulp technical field, refer to especially a kind of method that reduces the degree of polymerization in cotton linter production pulp process.
Background technology
At present, viscose fiber is generally cotton linter → boiling → wash → bleach → wash after floating by the production method of pulp.Wherein, the main purpose one of boiling is degreasing, the 2nd, and the low-fiber degree of polymerization is fallen to the level requiring, and boiling medicine is generally caustic soda.The object of washing is the leachable of removing after boiling.The object of bleaching is to improve into pulp brightness to the level requiring.The object of washing after floating is the leachable washing away in bleaching process.
In process of production, if when the ash in raw material is too high, one-level multistage or secondary multistage heavy scummer generally also to be set before and after bleaching to reduce pulping ash.If when the iron-holder in raw material or in industrial water is high, generally after bleaching, also to set up one section of acid cleaning process, to remove the iron ion in slurry.If when cotton linter fiber is longer, generally before bleaching, also to beating equipment be set to fiber is suitably cut off.If when impurity content is higher in raw material, generally also to screening system be set certain workshop section after boiling, to remove impurity in slurry.For reducing bleaching chemical consumption or improving whiteness, bleachery can be arranged to multistage bleaching.
, there is certain defect in such production method, specific as follows: the method reduction fiber degree of polymerization one that adopts boiling is that the consumption of expensive boiling chemicals is large; The 2nd, the steam consumption of boiling is high; The 3rd, the yield of boiling is low; The 4th, the intractability of the black liquor that boiling produces is large, and cost of water treatment is high; The 5th, the chemical cellulose content of pulping is low.So research and develop the low pollution of a kind of low cost, the poly-method of falling of high chemical cellulose content is necessary and has an actual production meaning.
Summary of the invention
The present invention proposes a kind of cotton linter and produces the method that reduces the degree of polymerization in pulp process, has solved in prior art, to reduce that fiber degree of polymerization energy consumption is high, productive rate is low, the intractability of black liquor is large, the problem that cost of water treatment is high.
Technical scheme of the present invention is achieved in that
Cotton linter is produced the method that reduces the degree of polymerization in pulp process, comprises cotton linter processing, washes step after bleaching, floating, and is provided with acid treatment step before bleaching process or after bleaching process; In described acid treatment step, acidizer used is at least one acid; The consumption of acidizer is 0.5-10wt%; Treatment temperature is 20-180 ℃; Processing time is 0.5-10 hour; Pulp density is 3-30wt%; The consumption size of described acidizer is inversely proportional to treatment temperature height, and consumption size and the length in processing time of described acidizer are inversely proportional to; The height of described treatment temperature is inversely proportional to the length in processing time.
As the improvement to technique scheme, described acidizer is one or more in sulfuric acid, hydrochloric acid, nitric acid.
As the further improvement to technique scheme, when the consumption 0.5-2.5wt% of described acidizer, treatment temperature is 75-150 ℃.
As the improvement to technique scheme, described acidizer is hypochlorous acid, and treatment temperature is 55-100 ℃.
As the improvement to technique scheme, described acidizer is sulfurous acid, and treatment temperature is 75-180 ℃.
As the improvement to technique scheme, described bleaching process is multistage bleaching, is provided with acid treatment step in the middle of described multistage bleaching.
As the improvement to technique scheme, described acidizer is chlorine, and treatment temperature is 40-100 ℃, and the processing time is 3-10 hour.
As the further improvement to technique scheme, described finishing agent is chlorine, and treatment temperature is 50-100 ℃, and the processing time is 2-10 hour.
As the further improvement to technique scheme, described multistage bleaching is the bleaching of 2-5 section.
Adopt after technique scheme, the invention has the beneficial effects as follows:
Due to without boiling without caustic soda, can effectively prevent falling poly-impact not quite, but can effectively be lowered into the carrying out of the cellulosic peeling reaction of pulp yield, the one, improve into pulp yield, the 2nd, greatly improve the content of chemical cellulose, the 3rd, reduce water treatment difficulty and cost of water treatment.
The cellulose macromolecule that for example degree of polymerization is 1000, if occur peeling reaction the degree of polymerization become 999, and yield has also reduced by 1/1000, the terminal groups falling down is dissolved in black digestion liquid, the one, be lowered into pulp yield, the 2nd, improve black liquid consistency.Cellulosic alkaline bleach liquor degradation is under the high-alkali condition of high temperature, and certain glycosidic linkage on cellulose long-chain ruptures, thereby causes the degree of polymerization to decline.If if 1000 cellulosic degree of polymerization ruptures at 1/2 place, can produce the cellulose macromolecule of the degree of polymerization of two each 500, but the yield of pulping does not reduce.The principle of acid degradation and alkaline bleach liquor degradation is identical, but the peeling reaction in alkaline bleach liquor degradation process can not occur acid degradation process.
So adopt the strongest acid inorganic acid to fall to be polymerized to minimum, effect is best, so we select sulfuric acid, hydrochloric acid and nitric acid.It is exactly to remove the iron ion in slurry that another poly-advantage falls in inorganic acid simultaneously, can exempt the pickling process of later process.
The specific embodiment
To the technical scheme in the embodiment of the present invention be clearly and completely described below, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
The degree of polymerization of cotton linter after cellulase treatment is 2000, adds the H of 5wt% after two sections of hydrogen peroxide bleachings again
2sO
4, the degree of polymerization in the dense lower processing of slurry of 50 ℃ of 10wt% after 2 hours reduces to 500.
Embodiment 2:
The degree of polymerization of cotton linter after cellulase treatment is 2000, first passes through the H of 5wt%
2sO
4in the dense lower processing of slurry of 50 ℃ of 10wt% after 2 hours, then through two sections of H
2o
2the degree of polymerization after bleaching reduces to 500.Embodiment 2 has improved four degree than embodiment 1 whiteness under identical conditions of bleaching, and reason is that in first starching after enzyme is processed, iron ion is removed, has improved H
2o
2bleaching efficiency.
Embodiment 3:
The degree of polymerization of cotton linter after cellulase treatment is 2000, adds the H of 10wt%
2sO
4the degree of polymerization of processing after 4 hours at the dense lower normal temperature of slurry (20 ℃) of 10wt% reduces to 500.
Embodiment 4:
The degree of polymerization of cotton linter after cellulase treatment is 2000, adds the H of 0.5wt%
2sO
4, dense at the slurry of 10wt%, the degree of polymerization of processing 2 hours at 120 ℃ of temperature reduces to 500.
Embodiment 5:
The degree of polymerization of cotton linter after cellulase treatment is 2000, adds the H of 2wt%
2sO
4, dense at the slurry of 10wt%, temperature 50 C, the degree of polymerization in 10 hours processing times reduces to 500.
Embodiment 6:
The degree of polymerization of cotton linter after cellulase treatment is 2000, adds the H of 5wt%
2sO
4, dense at the slurry of 3wt%, when temperature 50 C, the degree of polymerization of processing after 6 hours reduces to 500.
Embodiment 7:
While replacing sulfuric acid with hydrochloric acid or nitric acid, can obtain the essentially identical poly-effect of falling.
Embodiment 8:
Cotton linter is at 90 ℃ of temperature, and the degree of polymerization adding after 5wt%NaOH degreasing is 1800, adds 5wt%H
2sO
4, at temperature 50 C, starch the degree of polymerization of processing after 1.5 hours under dense 10wt% and reduce to 500.
Embodiment 9:
The degree of polymerization of cotton linter after cellulase treatment is 2000, adds the Cl of 5wt%
2, at the dense 5wt% of slurry, under temperature 50 C, process the degree of polymerization after 3 hours and reduce to 500.
Embodiment 10:
The degree of polymerization of cotton linter after cellulase treatment is 2000, adds sulfuric acid, the hydrochloric acid of 1wt% and the nitric acid of 1wt% of 1wt%, and at the dense 20wt% of slurry, the degree of polymerization of processing under temperature 50 C after 2 hours reduces to 500.
Embodiment 11:
The degree of polymerization of cotton linter after cellulase treatment is 2000, adds the Cl of 6wt%
2the dense 3wt% of rear slurry, processes the degree of polymerization after 6 hours at 40 ℃ of temperature and reduces to 500.
Embodiment 12:
The degree of polymerization of cotton linter after cellulase treatment is 2000, and the sulfurous acid that adds 5wt% is at the dense 30wt% of slurry, at 80 ℃ of temperature, processes 2 hours, and the degree of polymerization reduces to 500.
Embodiment 13:
The degree of polymerization of cotton linter after cellulase treatment is 2000, and the oxalic acid that adds 2wt% is at the dense 10wt% of slurry, at 150 ℃ of temperature, processes 2 hours, and the degree of polymerization reduces to 500.
Embodiment 14:
The degree of polymerization of cotton linter after cellulase treatment is 2000, adds the Cl of 5wt%
2, under temperature 45 C, process 2 hours, then add the Cl of 5wt%
2, add caustic soda simultaneously and regulate pH value to 6-7, at 55 ℃ of temperature, to process again 2 hours, the degree of polymerization reduces to 500.
Sulfuric acid, hydrochloric acid, nitric acid dosage are during lower than 2wt%, and treatment temperature is greater than 60 ℃, and the processing time while falling 40 ℃ of degree of processing when poly-with chlorine is greater than 2 hours.
Cl
2when 40 ℃ for the treatment of temperatures, the processing time is greater than 4 hours.
Cl
2when treatment temperature is normal temperature (20 ℃), the processing time is greater than 5 hours.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. cotton linter is produced the method that reduces the degree of polymerization in pulp process, comprises cotton linter processing, washes step after bleaching, floating, and it is characterized in that: before bleaching process or after bleaching process, be provided with acid treatment step; In described acid treatment step, acidizer used is at least one acid; The consumption of acidizer is 0.5-10wt%; Treatment temperature is 20-180 ℃; Processing time is 0.5-10 hour; Pulp density is 3-30wt%; The consumption size of described acidizer is inversely proportional to treatment temperature height, and consumption size and the length in processing time of described acidizer are inversely proportional to; The height of described treatment temperature is inversely proportional to the length in processing time.
2. cotton linter as claimed in claim 1 is produced the method that reduces the degree of polymerization in pulp process, it is characterized in that: described acidizer is one or more in sulfuric acid, hydrochloric acid, nitric acid.
3. cotton linter as claimed in claim 2 is produced the method that reduces the degree of polymerization in pulp process, it is characterized in that: when the consumption 0.5-2.5wt% of described acidizer, treatment temperature is 75-150 ℃.
4. cotton linter as claimed in claim 1 is produced the method that reduces the degree of polymerization in pulp process, it is characterized in that: described acidizer is hypochlorous acid, and treatment temperature is 55-100 ℃.
5. cotton linter as claimed in claim 1 is produced the method that reduces the degree of polymerization in pulp process, it is characterized in that: described acidizer is sulfurous acid, and treatment temperature is 75-180 ℃.
6. the cotton linter as described in claim 1-5 any one is produced the method that reduces the degree of polymerization in pulp process, it is characterized in that: described bleaching process is multistage bleaching, is provided with acid treatment step in the middle of described multistage bleaching.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410050100.5A CN103882760A (en) | 2014-02-13 | 2014-02-13 | Method for reducing polymerization degree in process of producing pulp through linters |
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|---|---|---|---|
| CN201410050100.5A CN103882760A (en) | 2014-02-13 | 2014-02-13 | Method for reducing polymerization degree in process of producing pulp through linters |
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| CN103882760A true CN103882760A (en) | 2014-06-25 |
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| CN201410050100.5A Pending CN103882760A (en) | 2014-02-13 | 2014-02-13 | Method for reducing polymerization degree in process of producing pulp through linters |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106758455A (en) * | 2016-12-27 | 2017-05-31 | 安徽雨禾精纤股份有限公司 | A kind of THE TECHNICS IN PULPMAKING OF COTTON LINTER |
| CN114711451A (en) * | 2022-05-13 | 2022-07-08 | 湖北中烟工业有限责任公司 | Cotton linter cellulose derivative for tobacco sheets and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101105012A (en) * | 2007-06-14 | 2008-01-16 | 山东海龙股份有限公司 | Method for producing high whiteness cotton pulp by using cotton linter |
| CN101701431A (en) * | 2008-07-16 | 2010-05-05 | 中国制浆造纸研究院 | Method for producing bleached pulp for viscose fibers from bamboo |
| CN101736427A (en) * | 2009-12-22 | 2010-06-16 | 唐山三友集团东光浆粕有限责任公司 | Bamboo alpha-pulp for viscose and production method thereof |
-
2014
- 2014-02-13 CN CN201410050100.5A patent/CN103882760A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101105012A (en) * | 2007-06-14 | 2008-01-16 | 山东海龙股份有限公司 | Method for producing high whiteness cotton pulp by using cotton linter |
| CN101701431A (en) * | 2008-07-16 | 2010-05-05 | 中国制浆造纸研究院 | Method for producing bleached pulp for viscose fibers from bamboo |
| CN101736427A (en) * | 2009-12-22 | 2010-06-16 | 唐山三友集团东光浆粕有限责任公司 | Bamboo alpha-pulp for viscose and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 袁诗敏: "漂白针叶木浆制备浆粕工艺的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》, no. 9, 15 September 2012 (2012-09-15), pages 024 - 155 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106758455A (en) * | 2016-12-27 | 2017-05-31 | 安徽雨禾精纤股份有限公司 | A kind of THE TECHNICS IN PULPMAKING OF COTTON LINTER |
| CN114711451A (en) * | 2022-05-13 | 2022-07-08 | 湖北中烟工业有限责任公司 | Cotton linter cellulose derivative for tobacco sheets and preparation method and application thereof |
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Application publication date: 20140625 |