CN102888775B - Bleaching process of paper pulp - Google Patents
Bleaching process of paper pulp Download PDFInfo
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- CN102888775B CN102888775B CN201210439770.7A CN201210439770A CN102888775B CN 102888775 B CN102888775 B CN 102888775B CN 201210439770 A CN201210439770 A CN 201210439770A CN 102888775 B CN102888775 B CN 102888775B
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- bleaching
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Abstract
The invention discloses a bleaching process of paper pulp, which is a new chloride-free bleaching process conforming to national industrial policies and effectively improves whiteness and whiteness stability of the paper pulp. The bleaching process comprises the steps of: (1) adding pypocholoride into the paper pulp to be bleached for carrying out pre-bleaching; (2) after washing, bleaching with oxygen delignification; (3) bleaching by utilizing hydrogen peroxide; (4) adding chlorine dioxide to carry out supplementary bleaching; and (5) washing and then carrying out a papermaking process. With the adoption of the bleaching process disclosed by the invention, the whiteness of the paper pulp reaches up to be more than 85%, and the whiteness stability is good.
Description
Technical field
The present invention relates to a kind of bleaching process, be specifically related to a kind of bleaching process of paper pulp.
Background technology
Traditional non-wood-fiber paper pulp and broad-leaved wood fiber paper pulp, mainly take CEH tri-stage bleaching technique to produce, but CEH tri-stage bleaching technique there is bleaching whiteness and yield is low, pulp viscosity loss is large, waste water load is heavy and the shortcoming of wastewater with A/O X severe overweight.For this reason, " papermaking Industry Development Policy " chapter 4 that National Development and Reform Committee promulgated in November, 2007 is expressly provided " encourage growth application High Yield Pulping Technology, biotechnology, low stain pulping technique, in dense technology, element-free chlorine or total chlorine free bleaching technology "; Article 23 regulation " forbids that project begun newly adopts elemental chlorine (i.e. liquid chlorine) bleaching process (existing enterprise should progressively eliminate) ".
Chinese patent application 200910272621.4 discloses a kind of bleaching process of paper pulp, and by paper pulp residual lignin after oxygen delignification bleaching removing boiling, recycling hydrogen peroxide removes lignin further, finally carries out post-bleach with calcium hypochlorite.The paper pulp bleaching process whiteness about 80% of this invention, but bleaching process is single on the whole, not enough effectively improves the whiteness of product.
Summary of the invention
The object of the invention is, for overcoming above-mentioned the deficiencies in the prior art, a kind of bleaching process of paper pulp to be provided, to meet the new technology of the chlorine-free bleaching of national industrial policies, effectively improve whiteness and the retention of whiteness of paper pulp.
For achieving the above object, the present invention adopts following technical proposals:
A kind of paper pulp bleaching process, comprises the following steps:
(1) in paper pulp to be bleached, add hypochlorite and carry out pre-bleaching;
(2) oxygen delignification bleaching is passed through after washing;
(3) hydrogen peroxide bleaching is utilized;
(4) add chlorine dioxide and carry out post-bleach;
(5) wash, then enter copy paper operation.
Described in step (1), the consumption of hypochlorite, calculates with effective chlorine, is 2 ~ 5% of pulp weight; PH value is 8 ~ 12; Temperature is 30 ~ 60 DEG C; Time is 20 ~ 90min; Pulp density is 5 ~ 15%.
Temperature 90 ~ 120 DEG C in step (2), flow of oxygen 15 ~ 20kg/t starches, and NaOH consumption 2 ~ 4kg/t starches, magnesium sulfate consumption 0.1 ~ 0.5wt%.
Pulp density 5 ~ 15% in step (3), slurry temperature 40 ~ 60 DEG C, H
2o
2consumption 12 ~ 18kg/t starches, slurry pH value 10 ~ 11, time 40 ~ 90min.
In step (4), Chlorine is 0.2 ~ 1.0% of pulp weight, and pH value is 3 ~ 5, and temperature is 30 ~ 60 DEG C.
The invention has the beneficial effects as follows, pulp brightness reaches more than 85%, and retention of whiteness is good.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further elaborated, should be noted that following explanation is only to explain the present invention, not limiting its content.
Embodiment 1:
Paper pulp bleaching process of the present invention, comprises the following steps:
(1) in paper pulp to be bleached, add calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite, calculates with effective chlorine, is 2% of pulp weight; PH value is 8 ~ 12; Temperature is 30 DEG C; Time is 20min; Pulp density is 5%.
(2) oxygen delignification bleaching is passed through after washing; Temperature 90 DEG C, flow of oxygen 15kg/t starches, and NaOH consumption 2kg/t starches, magnesium sulfate consumption 0.1wt%.
(3) hydrogen peroxide bleaching is utilized; Pulp density 5%, slurry temperature 40 DEG C, H
2o
2consumption 12kg/t starches, slurry pH value 10 ~ 11, time 40min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 0.2% of pulp weight, and pH value is 3 ~ 5, and temperature is 30 DEG C.
(5) wash, then enter copy paper operation.
Pulp brightness is 85%, and retention of whiteness is good.
Embodiment 2:
Paper pulp bleaching process of the present invention, comprises the following steps:
(1) in paper pulp to be bleached, add calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite, calculates with effective chlorine, is 5% of pulp weight; PH value is 8 ~ 12; Temperature is 60 DEG C; Time is 90min; Pulp density is 15%.
(2) oxygen delignification bleaching is passed through after washing; Temperature 120 DEG C, flow of oxygen 20kg/t starches, and NaOH consumption 4kg/t starches, magnesium sulfate consumption 0.5wt%.
(3) hydrogen peroxide bleaching is utilized; Pulp density 15%, slurry temperature 60 DEG C, H
2o
2consumption 18kg/t starches, slurry pH value 11, time 90min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 1.0% of pulp weight, and pH value is 5, and temperature is 60 DEG C.
(5) wash, then enter copy paper operation.
Pulp brightness is 88%, and retention of whiteness is good.
Embodiment 3:
Paper pulp bleaching process of the present invention, comprises the following steps:
(1) in paper pulp to be bleached, add calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite, calculates with effective chlorine, is 3% of pulp weight; PH value is 8 ~ 12; Temperature is 50 DEG C; Time is 50min; Pulp density is 10%.
(2) oxygen delignification bleaching is passed through after washing; Temperature 100 DEG C, flow of oxygen 18kg/t starches, and NaOH consumption 3kg/t starches, magnesium sulfate consumption 0.3wt%.
(3) hydrogen peroxide bleaching is utilized; Pulp density 10%, slurry temperature 50 DEG C, H
2o
2consumption 14kg/t starches, slurry pH value 10 ~ 11, time 60min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 0.8% of pulp weight, and pH value is 3 ~ 5, and temperature is 40 DEG C.
(5) wash, then enter copy paper operation.
Pulp brightness is 86%, and retention of whiteness is good.
Embodiment 4:
Paper pulp bleaching process of the present invention, comprises the following steps:
(1) in paper pulp to be bleached, add calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite, calculates with effective chlorine, is 4% of pulp weight; PH value is 8 ~ 12; Temperature is 45 DEG C; Time is 45min; Pulp density is 12%.
(2) oxygen delignification bleaching is passed through after washing; Temperature 100 DEG C, flow of oxygen 17kg/t starches, and NaOH consumption 2.6kg/t starches, magnesium sulfate consumption 0.45wt%.
(3) hydrogen peroxide bleaching is utilized; Pulp density 12%, slurry temperature 45 DEG C, H
2o
2consumption 15kg/t starches, slurry pH value 10 ~ 11, time 45min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 0.6% of pulp weight, and pH value is 3 ~ 5, and temperature is 45 DEG C.
(5) wash, then enter copy paper operation.
Pulp brightness is 87%, and retention of whiteness is good.
Embodiment 5:
Paper pulp bleaching process of the present invention, comprises the following steps:
(1) in paper pulp to be bleached, add calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite, calculates with effective chlorine, is 2% of pulp weight; PH value is 8 ~ 12; Temperature is 60 DEG C; Time is 20min; Pulp density is 5%.
(2) oxygen delignification bleaching is passed through after washing; Temperature 120 DEG C, flow of oxygen 20kg/t starches, and NaOH consumption 2 ~ 4kg/t starches, magnesium sulfate consumption 0.1wt%.
(3) hydrogen peroxide bleaching is utilized; Pulp density 5%, slurry temperature 40 DEG C, H
2o
2consumption 12kg/t starches, slurry pH value 10 ~ 11, time 40min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 1.0% of pulp weight, and pH value is 3 ~ 5, and temperature is 60 DEG C.
(5) wash, then enter copy paper operation.
Pulp brightness is 85%, and retention of whiteness is good.
Embodiment 6:
Paper pulp bleaching process of the present invention, comprises the following steps:
(1) in paper pulp to be bleached, add calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite, calculates with effective chlorine, is 5% of pulp weight; PH value is 8 ~ 12; Temperature is 60 DEG C; Time is 90min; Pulp density is 15%.
(2) oxygen delignification bleaching is passed through after washing; Temperature 90 DEG C, flow of oxygen 15kg/t starches, and NaOH consumption 2 ~ 4kg/t starches, magnesium sulfate consumption 0.1wt%.
(3) hydrogen peroxide bleaching is utilized; Pulp density 15%, slurry temperature 60 DEG C, H
2o
2consumption 12kg/t starches, slurry pH value 10 ~ 11, time 40min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 1.0% of pulp weight, and pH value is 3 ~ 5, and temperature is 60 DEG C.
(5) wash, then enter copy paper operation.
Pulp brightness is 85%, and retention of whiteness is good.
Embodiment 7:
Paper pulp bleaching process of the present invention, comprises the following steps:
(1) in paper pulp to be bleached, add calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite, calculates with effective chlorine, is 5% of pulp weight; PH value is 8 ~ 12; Temperature is 55 DEG C; Time is 20min; Pulp density is 13%.
(2) oxygen delignification bleaching is passed through after washing; Temperature 90 DEG C, flow of oxygen 15kg/t starches, and NaOH consumption 4kg/t starches, magnesium sulfate consumption 0.1wt%.
(3) hydrogen peroxide bleaching is utilized; Pulp density 13%, slurry temperature 40 ~ 60 DEG C, H
2o
2consumption 18kg/t starches, slurry pH value 10 ~ 11, time 40min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 1.0% of pulp weight, and pH value is 3 ~ 5, and temperature is 60 DEG C.
(5) wash, then enter copy paper operation.
Pulp brightness is 86%, and retention of whiteness is good.
Embodiment 8:
Paper pulp bleaching process of the present invention, comprises the following steps:
(1) in paper pulp to be bleached, add calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite, calculates with effective chlorine, is 5% of pulp weight; PH value is 8 ~ 12; Temperature is 30 DEG C; Time is 20 ~ 90min; Pulp density is 15%.
(2) oxygen delignification bleaching is passed through after washing; Temperature 120 DEG C, flow of oxygen 17kg/t starches, and NaOH consumption 4kg/t starches, magnesium sulfate consumption 0.5wt%.
(3) hydrogen peroxide bleaching is utilized; Pulp density 15%, slurry temperature 60 DEG C, H
2o
2consumption 18kg/t starches, slurry pH value 10 ~ 11, time 90min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 1.0% of pulp weight, and pH value is 3 ~ 5, and temperature is 60 DEG C.
(5) wash, then enter copy paper operation.
Pulp brightness is 86%, and retention of whiteness is good.
Although above-mentioned, the specific embodiment of the present invention is described; but not limiting the scope of the invention; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (1)
1. a paper pulp bleaching process, is characterized in that, comprises the following steps:
(1) in paper pulp to be bleached, add hypochlorite and carry out pre-bleaching;
(2) oxygen delignification bleaching is passed through after washing;
(3) hydrogen peroxide bleaching is utilized;
(4) add chlorine dioxide and carry out post-bleach;
(5) wash, then enter copy paper operation;
Described in step (1), the consumption of hypochlorite, calculates with effective chlorine, is 2 ~ 5% of pulp weight; PH value is 8 ~ 12; Temperature is 30 ~ 60 DEG C; Time is 20 ~ 90min; Pulp density is 5 ~ 15%;
Temperature 90 ~ 120 DEG C in step (2), flow of oxygen 15 ~ 20kg/t starches, and NaOH consumption 2 ~ 4kg/t starches, magnesium sulfate consumption 0.1 ~ 0.5wt%;
Pulp density 5 ~ 15% in step (3), slurry temperature 40 ~ 60 DEG C, H
2o
2consumption 12 ~ 18kg/t starches, slurry pH value 10 ~ 11, time 40 ~ 90min;
In step (4), Chlorine is 0.2 ~ 1.0% of pulp weight, and pH value is 3 ~ 5, and temperature is 30 ~ 60 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210439770.7A CN102888775B (en) | 2012-11-07 | 2012-11-07 | Bleaching process of paper pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210439770.7A CN102888775B (en) | 2012-11-07 | 2012-11-07 | Bleaching process of paper pulp |
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| CN102888775A CN102888775A (en) | 2013-01-23 |
| CN102888775B true CN102888775B (en) | 2015-03-04 |
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| CN201210439770.7A Expired - Fee Related CN102888775B (en) | 2012-11-07 | 2012-11-07 | Bleaching process of paper pulp |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10138598B2 (en) | 2013-03-14 | 2018-11-27 | Gp Cellulose Gmbh | Method of making a highly functional, low viscosity kraft fiber using an acidic bleaching sequence and a fiber made by the process |
| CN109837792A (en) * | 2019-03-18 | 2019-06-04 | 中冶纸业银河有限公司 | A kind of method for bleaching of Wheat Straw Pulp |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401848A (en) * | 2002-08-01 | 2003-03-12 | 山东轻工业学院 | Paper pulp bleaching process |
| CN101446054A (en) * | 2008-12-23 | 2009-06-03 | 华南理工大学 | Total-chlorine-free bleaching method of paper pulp production line with annual output of more than 50,000 tons |
| CN101463573A (en) * | 2008-12-08 | 2009-06-24 | 沅江纸业有限责任公司 | Straw pulp bleaching technique |
| CN101760978A (en) * | 2009-11-03 | 2010-06-30 | 武汉晨鸣汉阳纸业股份有限公司 | Pulp-bleaching technique |
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- 2012-11-07 CN CN201210439770.7A patent/CN102888775B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401848A (en) * | 2002-08-01 | 2003-03-12 | 山东轻工业学院 | Paper pulp bleaching process |
| CN101463573A (en) * | 2008-12-08 | 2009-06-24 | 沅江纸业有限责任公司 | Straw pulp bleaching technique |
| CN101446054A (en) * | 2008-12-23 | 2009-06-03 | 华南理工大学 | Total-chlorine-free bleaching method of paper pulp production line with annual output of more than 50,000 tons |
| CN101760978A (en) * | 2009-11-03 | 2010-06-30 | 武汉晨鸣汉阳纸业股份有限公司 | Pulp-bleaching technique |
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Owner name: HENAN SCIENCE AND TECHNOLOGY COLLEGE Free format text: FORMER OWNER: WANG XINYI Effective date: 20150122 |
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Inventor after: Zhong Xueli Inventor after: Han Xiaoli Inventor after: Yang Jinhua Inventor after: Fu Qingyun Inventor after: Liu Qinhua Inventor after: Yang Zhixia Inventor before: Wang Xinyi |
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Free format text: CORRECT: INVENTOR; FROM: WANG XINYI TO: ZHONG XUELI HAN XIAOLI YANG JINHUA FU QINGYUN LIU QINHUA YANG ZHIXIA Free format text: CORRECT: ADDRESS; FROM: 250031 JINAN, SHANDONG PROVINCE TO: 453000 XINXIANG, HENAN PROVINCE |
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Effective date of registration: 20150122 Address after: 453000 Henan Institute of Science and Technology, Hongqi Road, Hongqi District, Henan, Xinxiang Applicant after: Henan Science and Technology College Address before: 250031 No. 23 normal road, Tianqiao District, Shandong, Ji'nan Applicant before: Wang Xinyi |
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