CN101161928B - Bleaching process for broussonetia papyrifera white bast bio-pulp - Google Patents
Bleaching process for broussonetia papyrifera white bast bio-pulp Download PDFInfo
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- CN101161928B CN101161928B CN2007101783687A CN200710178368A CN101161928B CN 101161928 B CN101161928 B CN 101161928B CN 2007101783687 A CN2007101783687 A CN 2007101783687A CN 200710178368 A CN200710178368 A CN 200710178368A CN 101161928 B CN101161928 B CN 101161928B
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Abstract
The invention discloses a bleaching method of broussonetia papyrifera white bast bio-pulp, which is passed through a slot screen of 20-60 mesh, and then processed with centrifugal separation, finally processed with supplementary bleaching with alkaline peroxide. The method can remove most colored material in bio-pulp by physical methods of slot screen and centrifugal separation, thereby effectively reducing dirt count in the bio-pulp, the whiteness of the bio-pulp is increased to 80-85 percent ISO from 38-44 percent ISO, the value of KMnO4 is decreased below 5.81 from 14-16, the yield is 90-95 percent, fiber average length is decreased to 6.92 mm from 6.34 mm, requirements of producing white paper or high grade paper classes can be completely fulfilled. Moreover, the method does not use chlorine-containing bleaching agent, has simple technology, low production cost and no environmental pollution. The invention has a wide application prospect in the pulp and paper field.
Description
Technical field
The present invention relates to the method for bleaching of the method for bleaching of pulping and paper-making field bast fibers, particularly a kind of broussonetia papyrifera white bast bio-pulp.
Background technology
Existing soft paper pulp, according to the difference of pulping process, its whiteness is all between 20%～40%ISO.In order to satisfy the needs of producing blank sheet of paper or high-grade paper kind, must bleach processing to above-mentioned paper pulp.Traditional method for bleaching adopts chlorination, alkali treatment, hypochlorite to carry out tri-stage bleaching; Modern means such as method for bleaching employing chlorine dioxide are carried out multistage bleaching.Owing to all use chlorine-containing bleaching in the above-mentioned method for bleaching, as chlorine, hypochlorite etc., inevitably can produce a large amount of generation toxicant AOX (adsorbable organohalogen compounds), very easily cause serious water pollution.Adopt chlorine dioxide to bleach, though ambient pollution burden alleviates to some extent, chlorine dioxide floats agent to be difficult to preserve, must use as early as possible after the preparation, and the preparation flow more complicated of chlorine dioxide, equipment investment is bigger.The core of TCF (completely without the chlorine) method for bleaching that the modern times are novel is oxygen-alkali treatment, though oxygen-alkali treatment can not produce AOX, needs working pressure container and oxygen generator, the bleaching process complexity, and energy consumption is higher.Said method all can not well satisfy the requirement of modern environment-friendly type bleaching process, thereby the assistant officer waits to develop and a kind ofly can improve the novel dioxde pulp bleaching process that bleaching efficiency can not produce carrying capacity of environment again.
Summary of the invention
The method for bleaching that the purpose of this invention is to provide a kind of broussonetia papyrifera white bast bio-pulp.
The method for bleaching of broussonetia papyrifera white bast bio-pulp provided by the invention may further comprise the steps:
1) broussonetia papyrifera white bast bio-pulp is screened with the 20-60 sighting slit, obtain screening broussonetia papyrifera white bast bio-pulp;
2) broussonetia papyrifera white bast bio-pulp after the above-mentioned screening is carried out centrifugation, obtain screening the broussonetia papyrifera white bast bio-pulp of purification;
3) above-mentioned broussonetia papyrifera white bast bio-pulp through the screening purified treatment is bleached with hydrogen peroxide under alkali condition, wherein, the pH value of the broussonetia papyrifera white bast bio-pulp that this screening purifies is 10-13, and bleaching temperature is 60-80 ℃.
In the above-mentioned method for bleaching, before step 1) screening, also the broussonetia papyrifera white bast bio-pulp water is sized mixing to mass percentage concentration be 0.5-1.0%.By screening, the tiny casting skin in the broussonetia papyrifera white bast bio-pulp and the shagreen of no solid shape can filter screen cloth, and stay the broussonetia papyrifera white bast bio-pulp that is on the screen cloth.
In step 2) before the step with centrifugal separation, also the broussonetia papyrifera white bast bio-pulp water is sized mixing to mass percentage concentration be 0.2-1.0%, preferred 0.5%.Used centrifugal separation method preferentially selects for use conical refiner to carry out purified treatment, thereby reaches the purpose of removing remaining casting skin in the broussonetia papyrifera white bast bio-pulp.
To through the broussonetia papyrifera white bast bio-pulp after the above-mentioned Screening Treatment, also to carry out post-bleach according to the method for step 3), wherein, bleaching temperature is preferably 70 ℃, and bleaching time is 2-4h, is preferably 2.5h; The mass percentage concentration of this bio-pulp is 10-12%, preferred 12%; The quality of hydrogen peroxide is the 2-6% of the broussonetia papyrifera white bast bio-pulp gross mass of screening purification, preferred 4%.In order to reach better bleaching effect, also need to add bleaching assistant, diethylene triamine pentacetic acid (DTPA) (DTPA), MgSO
4, Na
2SiO
3Diethylene triamine pentacetic acid (DTPA), MgSO
4, Na
2SiO
3Addition be respectively 0.10-0.50%, 0.02-0.10%, the 2-5% of the broussonetia papyrifera white bast bio-pulp gross mass that screening purifies, preferred, be respectively 0.25%, 0.05%, 3%.
The method for bleaching of broussonetia papyrifera white bast bio-pulp provided by the invention, utilize these two kinds of physical methods of slotted screen and centrifugation can remove most of band color substance in the bio-pulp, effectively reduce dirt count wherein, the whiteness of bio-pulp rises to 65%-70%ISO by 38%-44%ISO, KMnO
4Value drops to 6-8 by 14-16, uses a small amount of hydrogen peroxide to carry out post-bleach afterwards and handles, and the whiteness of bio-pulp is further improved, and brings up to 80%-85%ISO by 65%-70%ISO, KMnO
4Value reaches below 5.81, and the fiber yield is 90%-95%, and the average length of fiber is reduced to 6.29mm by 6.34mm, satisfies the needs of producing blank sheet of paper or high-grade paper kind fully.In addition, this method is not used chlorine-containing bleaching, need not use special pressure container and oxygen generator, and technology is easy, and production cost is lower, and non-environmental-pollution has broad application prospects in the pulping and paper-making field.
The specific embodiment
The present invention will be further described below in conjunction with specific embodiment, but the present invention is not limited to following examples.
Used hybridization paper mulberry is available from planting environmental organism scientific ﹠ technical corporation among the embodiment in the Dalian, and other materials is kind commonly used.
The bleaching of embodiment 1, broussonetia white bast biological slurry
The method that the broussonetia white bast biological slurry is bleached provided by the invention comprises the steps:
1) broussonetia white bast biological is starched water size mixing to mass percentage concentration be after 0.8%, adopt 40 sighting slits sieve that the broussonetia white bast biological slurry is screened, forming the tiny casting skin of dust point and the shagreen of no solid shape in the bio-pulp and can filter screen cloth, on the screen cloth is that broussonetia white bast biological is starched and stay.
2) the bio-pulp water after will screening size mixing to mass percentage concentration be 0.5%, utilize conical refiner further to remove remaining casting skin in the slurry.
After measured as can be known, through the slurry of the broussonetia white bast biological after the above-mentioned screening purified treatment, whiteness rises to 67.9% by 43.2%ISO, KMnO
4Value drops to 6.23 by 14.56.
3) utilize alkaline hydrogen peroxide to carry out post-bleach in above-mentioned broussonetia white bast biological slurry, this bleaching conditions is: the concentration of broussonetia white bast biological slurry is 12%, regulate the pH value of this screening purified treatment artifact slurry to 10-13 with NaOH, the addition of this NaOH is 4% of an above-mentioned bio-pulp quality, the addition of hydrogen peroxide is 4% of this bio-pulp quality, bleaching time is 2.5h, and bleaching temperature is 70 ℃; Auxiliary agent diethylene triamine pentacetic acid (DTPA) (DTPA), MgSO
4, Na
2SiO
3Addition be respectively 0.25%, 0.05%, 3% of this bio-pulp quality.
Through behind the above-mentioned hydrogen peroxide post-bleach, the whiteness of broussonetia white bast biological slurry is further brought up to 82.4%ISO, KMnO by 67.9%ISO
4Value drops to 5.31 by 6.23, and the average length of fiber is reduced to 6.29mm by 6.34mm, and yield is 95%.
The bleaching of embodiment 2, the white skin bio-pulp of wild paper mulberry
1) the white skin bio-pulp of wild paper mulberry water is sized mixing to mass percentage concentration be after 1.0%, adopt 60 sighting slits sieve that the white skin bio-pulp of wild paper mulberry is screened, forming the tiny casting skin of dust point and the shagreen of no solid shape in the bio-pulp and can filter screen cloth, on the screen cloth is the white skin bio-pulp of wild paper mulberry and stay.
2) the bio-pulp water after will screening size mixing to mass percentage concentration be 0.5%, utilize conical refiner further to remove remaining casting skin in the slurry.
After measured as can be known, through the white skin bio-pulp of wild paper mulberry after the above-mentioned screening purified treatment, whiteness rises to 66.7% by 43.2%ISO, KMnO
4Value drops to 6.72 by 14.56.
3) utilize alkaline hydrogen peroxide to carry out post-bleach the white skin bio-pulp of above-mentioned wild paper mulberry, this bleaching conditions is: the concentration of the white skin bio-pulp of wild paper mulberry is 12%, regulate this screening with NaOH and purify the pH value of artifact slurry to 10-13, the addition of NaOH is 4.5% of an above-mentioned bio-pulp quality, the addition of hydrogen peroxide is 4.5% of this bio-pulp quality, bleaching time is 2.5h, and bleaching temperature is 80 ℃; Auxiliary agent diethylene triamine pentacetic acid (DTPA) (DTPA), MgSO
4, Na
2SiO
3Addition be respectively 0.25%, 0.05%, 3% of this bio-pulp quality.
Through behind the above-mentioned hydrogen peroxide post-bleach, the whiteness of the white skin bio-pulp of wild paper mulberry is further brought up to 81.2%ISO, KMnO by 66.7%ISO
4Value drops to 5.81 by 6.72, and the average length of fiber is reduced to 6.29mm by 6.34mm, and yield is 93.5%.
The bleaching of embodiment 3, hybridization broussonetia papyrifera white bast bio-pulp
1) will hybridize the broussonetia papyrifera white bast bio-pulp water size mixing to mass percentage concentration be after 0.6%, adopt 30 sighting slits sieve that the hybridization broussonetia papyrifera white bast bio-pulp is screened, forming the tiny casting skin of dust point and the shagreen of no solid shape in the bio-pulp and can filter screen cloth, on the screen cloth is to hybridize broussonetia papyrifera white bast bio-pulp and stay.
2) the bio-pulp water after will screening size mixing to mass percentage concentration be 0.6%, utilize conical refiner further to remove remaining casting skin in the slurry.
After measured as can be known, through the hybridization broussonetia papyrifera white bast bio-pulp after the above-mentioned screening purified treatment, whiteness rises to 68.9% by 43.2%ISO, KMnO
4Value drops to 6.07 by 14.56.
3) utilize alkaline hydrogen peroxide to carry out post-bleach above-mentioned hybridization broussonetia papyrifera white bast bio-pulp, this bleaching conditions is: the concentration of hybridization broussonetia papyrifera white bast bio-pulp is 12%, regulate the pH value of this screening purified treatment artifact slurry to 10-13 with NaOH, the addition of this NaOH is 5% of an above-mentioned bio-pulp quality, the addition of hydrogen peroxide is 5% of this bio-pulp quality, bleaching time is 3.0h, and bleaching temperature is 70 ℃, auxiliary agent diethylene triamine pentacetic acid (DTPA) (DTPA), MgSO
4, Na
2SiO
3Addition be respectively 0.25%, 0.05%, 3% of this bio-pulp quality.
Through behind the above-mentioned hydrogen peroxide post-bleach, the whiteness of hybridization broussonetia papyrifera white bast bio-pulp is further brought up to 84.3%ISO, KMnO by 68.9%ISO
4Value drops to 5.28 by 6.07, and the average length of fiber is reduced to 6.29mm by 6.34mm, and yield is 94%.
Claims (12)
1. the method for bleaching of a broussonetia papyrifera white bast bio-pulp comprises the steps:
1) broussonetia papyrifera white bast bio-pulp is screened with the 20-60 sighting slit, obtain screening broussonetia papyrifera white bast bio-pulp;
2) described screening broussonetia papyrifera white bast bio-pulp is carried out centrifugation, obtain screening the broussonetia papyrifera white bast bio-pulp of purification;
3) be that the broussonetia papyrifera white bast bio-pulp that the described screening of 10-12% purifies is bleached with hydrogen peroxide under alkali condition with mass percentage concentration, wherein, the pH value of the broussonetia papyrifera white bast bio-pulp that described screening purifies is 10-13, the quality of hydrogen peroxide is the 2-6% of the broussonetia papyrifera white bast bio-pulp gross mass of described screening purification, bleaching temperature is 60-80 ℃, and bleaching time is 2-4h.
2. method according to claim 1, it is characterized in that: in the described step 3) hydrogen peroxide bleaching, the mass percentage concentration of the broussonetia papyrifera white bast bio-pulp that described screening purifies is 12%, and the quality of described hydrogen peroxide is 4% of the broussonetia papyrifera white bast bio-pulp gross mass that purifies of described screening.
3. method according to claim 1 is characterized in that: in the described step 3) hydrogen peroxide bleaching, described bleaching time is 2.5h.
4. method according to claim 1 is characterized in that: in the described step 3) hydrogen peroxide bleaching, described bleaching temperature is 70 ℃.
5. according to the arbitrary described method of claim 1-4, it is characterized in that: in the described step 3) hydrogen peroxide bleaching, also add diethylene triamine pentacetic acid (DTPA), MgSO
4, Na
2SiO
3, wherein, described diethylene triamine pentacetic acid (DTPA), MgSO
4, Na
2SiO
3Quality be respectively 0.10-0.50%, 0.02-0.10%, the 2-5% of the broussonetia papyrifera white bast bio-pulp gross mass that described screening purifies.
6. method according to claim 5 is characterized in that: described diethylene triamine pentacetic acid (DTPA), MgSO
4, Na
2SiO
3Quality be respectively 0.25%, 0.05%, 3% of broussonetia papyrifera white bast bio-pulp gross mass that described screening purifies.
7. according to the arbitrary described method of claim 1-4, it is characterized in that: in the described step 3) hydrogen peroxide bleaching, regulate the pH value of the broussonetia papyrifera white bast bio-pulp that described screening purifies and regulate with NaOH to 10-13, the addition of described NaOH is 2%～6% of the broussonetia papyrifera white bast bio-pulp gross mass that purifies of described screening.
8. method according to claim 7 is characterized in that: the addition of described NaOH is 4% of the broussonetia papyrifera white bast bio-pulp gross mass that purifies of described screening.
9. according to the arbitrary described method of claim 1-4, it is characterized in that: before the screening of described step 1), also described broussonetia papyrifera white bast bio-pulp is sized mixing to mass percentage concentration be 0.5-1.0%.
10. according to the arbitrary described method of claim 1-4, it is characterized in that: described step 2) before the centrifugation, also described screening broussonetia papyrifera white bast bio-pulp is sized mixing to mass percentage concentration be 0.2-1.0%.
11. method according to claim 10 is characterized in that: described step 2) before the centrifugation, also described screening broussonetia papyrifera white bast bio-pulp is sized mixing to mass percentage concentration be 0.5%.
12. method according to claim 10 is characterized in that: described step 2) centrifugation adopts conical refiner to carry out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101783687A CN101161928B (en) | 2007-11-29 | 2007-11-29 | Bleaching process for broussonetia papyrifera white bast bio-pulp |
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| CN2007101783687A CN101161928B (en) | 2007-11-29 | 2007-11-29 | Bleaching process for broussonetia papyrifera white bast bio-pulp |
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| CN101161928B true CN101161928B (en) | 2010-08-11 |
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| KR101526267B1 (en) * | 2008-11-28 | 2015-06-11 | (주)아모레퍼시픽 | Mask pack composed of the cosmetic cotton-like material produced from a paper mulberry |
| CN104264526B (en) * | 2014-09-29 | 2016-09-21 | 长沙理工大学 | Preparation method of firecracker red oil paper |
| CN108130777B (en) * | 2017-12-22 | 2021-02-02 | 齐鲁工业大学 | Normal-pressure low-temperature clean pulping process |
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Non-Patent Citations (2)
| Title |
|---|
| 白延坤 等.光叶楮白皮生物法制浆可漂性的研究.中国造纸学报22 1.2007,22(1),19-22. |
| 白延坤等.光叶楮白皮生物法制浆可漂性的研究.中国造纸学报22 1.2007,22(1),19-22. * |
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