CN102888775A - Bleaching process of paper pulp - Google Patents

Bleaching process of paper pulp Download PDF

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Publication number
CN102888775A
CN102888775A CN2012104397707A CN201210439770A CN102888775A CN 102888775 A CN102888775 A CN 102888775A CN 2012104397707 A CN2012104397707 A CN 2012104397707A CN 201210439770 A CN201210439770 A CN 201210439770A CN 102888775 A CN102888775 A CN 102888775A
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paper pulp
bleaching
slurry
consumption
bleaching process
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CN2012104397707A
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CN102888775B (en
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王欣宜
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Henan Institute of Science and Technology
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王欣宜
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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

A kind of bleaching process of paper pulp
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 has the bleaching whiteness and yield is low, the 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 of promulgating in November, 2007 of National Development and Reform Committee expressly provide " encourage growth use High Yield Pulping Technology, biotechnology, low pollute 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 (being liquid chlorine) bleaching process (existing enterprise should progressively eliminate) ".
Chinese patent application 200910272621.4 discloses a kind of bleaching process of paper pulp, removes paper pulp residual lignin after the boiling by oxygen delignification bleaching, and the recycling hydrogen peroxide is further removed lignin, carries out post-bleach with calcium hypochlorite at last.The paper pulp bleaching process whiteness about 80% of this invention, still bleaching process is single on the whole, not enough the whiteness of Effective Raise product.
Summary of the invention
The objective of the invention is provides a kind of bleaching process of paper pulp for overcoming above-mentioned the deficiencies in the prior art, meets the new technology of the chlorine-free bleaching of national industrial policies, the whiteness of Effective Raise paper pulp and retention of whiteness.
For achieving the above object, the present invention adopts following technical proposals:
A kind of paper pulp bleaching process may further comprise the steps:
(1) in paper pulp to be bleached, adds hypochlorite and carry out pre-bleaching;
(2) pass through oxygen delignification bleaching after the washing;
(3) utilize hydrogen peroxide bleaching;
(4) add chlorine dioxide and carry out post-bleach;
(5) then washing enters machine hand's order.
The consumption of hypochlorite calculates with effective chlorine described in the step (1), is 2 ~ 5% of paper pulp weight; The pH value is 8 ~ 12; Temperature is 30 ~ 60 ℃; Time is 20 ~ 90min; Pulp density is 5 ~ 15%.
Temperature is 90 ~ 120 ℃ in the step (2), flow of oxygen 15 ~ 20kg/t slurry, NaOH consumption 2 ~ 4kg/t slurry, magnesium sulfate consumption 0.1 ~ 0.5wt%.
Pulp density 5 ~ 15% in the step (3), 40 ~ 60 ℃ of slurry temperatures, H 2O 2Consumption 12 ~ 18kg/t slurry, slurry pH value 10 ~ 11, time 40 ~ 90min.
Chlorine is 0.2 ~ 1.0% of paper pulp weight in the step (4), and the pH value is 3 ~ 5, and temperature is 30 ~ 60 ℃.
The invention has the beneficial effects as follows, pulp brightness reaches more than 85%, and retention of whiteness is good.
The specific embodiment
The present invention will be further elaborated below in conjunction with embodiment, should be noted that following explanation only is in order to explain the present invention, its content not to be limited.
Embodiment 1:
Paper pulp bleaching process of the present invention may further comprise the steps:
(1) in paper pulp to be bleached, adds calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite calculates with effective chlorine, is 2% of paper pulp weight; The pH value is 8 ~ 12; Temperature is 30 ℃; Time is 20min; Pulp density is 5%.
(2) pass through oxygen delignification bleaching after the washing; 90 ℃ of temperature, flow of oxygen 15kg/t slurry, NaOH consumption 2kg/t slurry, magnesium sulfate consumption 0.1wt%.
(3) utilize hydrogen peroxide bleaching; Pulp density 5%, 40 ℃ of slurry temperatures, H 2O 2Consumption 12kg/t slurry, slurry pH value 10 ~ 11, time 40min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 0.2% of paper pulp weight, and the pH value is 3 ~ 5, and temperature is 30 ℃.
(5) then washing enters machine hand's order.
Pulp brightness is 85%, and retention of whiteness is good.
Embodiment 2:
Paper pulp bleaching process of the present invention may further comprise the steps:
(1) in paper pulp to be bleached, adds calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite calculates with effective chlorine, is 5% of paper pulp weight; The pH value is 8 ~ 12; Temperature is 60 ℃; Time is 90min; Pulp density is 15%.
(2) pass through oxygen delignification bleaching after the washing; 120 ℃ of temperature, flow of oxygen 20kg/t slurry, NaOH consumption 4kg/t slurry, magnesium sulfate consumption 0.5wt%.
(3) utilize hydrogen peroxide bleaching; Pulp density 15%, 60 ℃ of slurry temperatures, H 2O 2Consumption 18kg/t slurry, slurry pH value 11, time 90min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 1.0% of paper pulp weight, and the pH value is 5, and temperature is 60 ℃.
(5) then washing enters machine hand's order.
Pulp brightness is 88%, and retention of whiteness is good.
Embodiment 3:
Paper pulp bleaching process of the present invention may further comprise the steps:
(1) in paper pulp to be bleached, adds calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite calculates with effective chlorine, is 3% of paper pulp weight; The pH value is 8 ~ 12; Temperature is 50 ℃; Time is 50min; Pulp density is 10%.
(2) pass through oxygen delignification bleaching after the washing; 100 ℃ of temperature, flow of oxygen 18kg/t slurry, NaOH consumption 3kg/t slurry, magnesium sulfate consumption 0.3wt%.
(3) utilize hydrogen peroxide bleaching; Pulp density 10%, 50 ℃ of slurry temperatures, H 2O 2Consumption 14kg/t slurry, slurry pH value 10 ~ 11, time 60min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 0.8% of paper pulp weight, and the pH value is 3 ~ 5, and temperature is 40 ℃.
(5) then washing enters machine hand's order.
Pulp brightness is 86%, and retention of whiteness is good.
Embodiment 4:
Paper pulp bleaching process of the present invention may further comprise the steps:
(1) in paper pulp to be bleached, adds calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite calculates with effective chlorine, is 4% of paper pulp weight; The pH value is 8 ~ 12; Temperature is 45 ℃; Time is 45min; Pulp density is 12%.
(2) pass through oxygen delignification bleaching after the washing; 100 ℃ of temperature, flow of oxygen 17kg/t slurry, NaOH consumption 2.6kg/t slurry, magnesium sulfate consumption 0.45wt%.
(3) utilize hydrogen peroxide bleaching; Pulp density 12%, 45 ℃ of slurry temperatures, H 2O 2Consumption 15kg/t slurry, slurry pH value 10 ~ 11, time 45min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 0.6% of paper pulp weight, and the pH value is 3 ~ 5, and temperature is 45 ℃.
(5) then washing enters machine hand's order.
Pulp brightness is 87%, and retention of whiteness is good.
Embodiment 5:
Paper pulp bleaching process of the present invention may further comprise the steps:
(1) in paper pulp to be bleached, adds calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite calculates with effective chlorine, is 2% of paper pulp weight; The pH value is 8 ~ 12; Temperature is 60 ℃; Time is 20min; Pulp density is 5%.
(2) pass through oxygen delignification bleaching after the washing; 120 ℃ of temperature, flow of oxygen 20kg/t slurry, NaOH consumption 2 ~ 4kg/t slurry, magnesium sulfate consumption 0.1wt%.
(3) utilize hydrogen peroxide bleaching; Pulp density 5%, 40 ℃ of slurry temperatures, H 2O 2Consumption 12kg/t slurry, slurry pH value 10 ~ 11, time 40min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 1.0% of paper pulp weight, and the pH value is 3 ~ 5, and temperature is 60 ℃.
(5) then washing enters machine hand's order.
Pulp brightness is 85%, and retention of whiteness is good.
Embodiment 6:
Paper pulp bleaching process of the present invention may further comprise the steps:
(1) in paper pulp to be bleached, adds calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite calculates with effective chlorine, is 5% of paper pulp weight; The pH value is 8 ~ 12; Temperature is 60 ℃; Time is 90min; Pulp density is 15%.
(2) pass through oxygen delignification bleaching after the washing; 90 ℃ of temperature, flow of oxygen 15kg/t slurry, NaOH consumption 2 ~ 4kg/t slurry, magnesium sulfate consumption 0.1wt%.
(3) utilize hydrogen peroxide bleaching; Pulp density 15%, 60 ℃ of slurry temperatures, H 2O 2Consumption 12kg/t slurry, slurry pH value 10 ~ 11, time 40min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 1.0% of paper pulp weight, and the pH value is 3 ~ 5, and temperature is 60 ℃.
(5) then washing enters machine hand's order.
Pulp brightness is 85%, and retention of whiteness is good.
Embodiment 7:
Paper pulp bleaching process of the present invention may further comprise the steps:
(1) in paper pulp to be bleached, adds calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite calculates with effective chlorine, is 5% of paper pulp weight; The pH value is 8 ~ 12; Temperature is 55 ℃; Time is 20min; Pulp density is 13%.
(2) pass through oxygen delignification bleaching after the washing; 90 ℃ of temperature, flow of oxygen 15kg/t slurry, NaOH consumption 4kg/t slurry, magnesium sulfate consumption 0.1wt%.
(3) utilize hydrogen peroxide bleaching; Pulp density 13%, 40 ~ 60 ℃ of slurry temperatures, H 2O 2Consumption 18kg/t slurry, slurry pH value 10 ~ 11, time 40min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 1.0% of paper pulp weight, and the pH value is 3 ~ 5, and temperature is 60 ℃.
(5) then washing enters machine hand's order.
Pulp brightness is 86%, and retention of whiteness is good.
Embodiment 8:
Paper pulp bleaching process of the present invention may further comprise the steps:
(1) in paper pulp to be bleached, adds calcium hypochlorite and carry out pre-bleaching; The consumption of calcium hypochlorite calculates with effective chlorine, is 5% of paper pulp weight; The pH value is 8 ~ 12; Temperature is 30 ℃; Time is 20 ~ 90min; Pulp density is 15%.
(2) pass through oxygen delignification bleaching after the washing; 120 ℃ of temperature, flow of oxygen 17kg/t slurry, NaOH consumption 4kg/t slurry, magnesium sulfate consumption 0.5wt%.
(3) utilize hydrogen peroxide bleaching; Pulp density 15%, 60 ℃ of slurry temperatures, H 2O 2Consumption 18kg/t slurry, slurry pH value 10 ~ 11, time 90min.
(4) add chlorine dioxide and carry out post-bleach; Chlorine is 1.0% of paper pulp weight, and the pH value is 3 ~ 5, and temperature is 60 ℃.
(5) then washing enters machine hand's order.
Pulp brightness is 86%, and retention of whiteness is good.
Although above-mentioned the specific embodiment of the present invention is described; but be 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 modifications that creative work can make or distortion still in protection scope of the present invention.

Claims (5)

1. a paper pulp bleaching process is characterized in that, may further comprise the steps:
(1) in paper pulp to be bleached, adds hypochlorite and carry out pre-bleaching;
(2) pass through oxygen delignification bleaching after the washing;
(3) utilize hydrogen peroxide bleaching;
(4) add chlorine dioxide and carry out post-bleach;
(5) then washing enters machine hand's order.
2. a kind of paper pulp bleaching process according to claim 1 is characterized in that, the consumption of hypochlorite calculates with effective chlorine described in the step (1), is 2 ~ 5% of paper pulp weight; The pH value is 8 ~ 12; Temperature is 30 ~ 60 ℃; Time is 20 ~ 90min; Pulp density is 5 ~ 15%.
3. a kind of paper pulp bleaching process according to claim 1 is characterized in that, temperature is 90 ~ 120 ℃ in the step (2), flow of oxygen 15 ~ 20kg/t slurry, NaOH consumption 2 ~ 4kg/t slurry, magnesium sulfate consumption 0.1 ~ 0.5wt%.
4. a kind of paper pulp bleaching process according to claim 1 is characterized in that, pulp density 5 ~ 15% in the step (3), 40 ~ 60 ℃ of slurry temperatures, H 2O 2Consumption 12 ~ 18kg/t slurry, slurry pH value 10 ~ 11, time 40 ~ 90min.
5. a kind of paper pulp bleaching process according to claim 1 is characterized in that, Chlorine is 0.2 ~ 1.0% of paper pulp weight in the step (4), and the pH value is 3 ~ 5, and temperature is 30 ~ 60 ℃.
CN201210439770.7A 2012-11-07 2012-11-07 Bleaching process of paper pulp Expired - Fee Related CN102888775B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105121735A (en) * 2013-03-14 2015-12-02 Gp纤维素股份有限公司 A method of making highly functional, low viscosity sulfate 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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105121735A (en) * 2013-03-14 2015-12-02 Gp纤维素股份有限公司 A method of making highly functional, low viscosity sulfate fiber using an acidic bleaching sequence and a fiber made by the process
CN105121735B (en) * 2013-03-14 2018-06-29 Gp 纤维素股份有限公司 With acid bleaching sequence manufacture high functionalization's low-viscosity sulfur silicate fiber method and thus technique manufacture fiber
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
TWI667390B (en) * 2013-03-14 2019-08-01 瑞士商Gp纖維股份有限公司 Method for making kraft pulp using multi-stage bleaching process and kraft pulp obtained therefrom
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

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