CN105908552A - A method of reducing a chlorine using amount in a chlorine dioxide D<0>E<p>D<1> three-stage bleaching process - Google Patents

A method of reducing a chlorine using amount in a chlorine dioxide D<0>E<p>D<1> three-stage bleaching process Download PDF

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Publication number
CN105908552A
CN105908552A CN201610243267.2A CN201610243267A CN105908552A CN 105908552 A CN105908552 A CN 105908552A CN 201610243267 A CN201610243267 A CN 201610243267A CN 105908552 A CN105908552 A CN 105908552A
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China
Prior art keywords
bleaching
chlorine
bagasse pulp
mass
chlorine dioxide
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Pending
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CN201610243267.2A
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Chinese (zh)
Inventor
骆莲新
闫兆晴
金叶
李明富
宋雪萍
王志伟
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Guangxi University
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Guangxi University
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Priority to CN201610243267.2A priority Critical patent/CN105908552A/en
Publication of CN105908552A publication Critical patent/CN105908552A/en
Pending legal-status Critical Current

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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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
    • 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
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
    • 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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process
    • 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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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

A method of reducing a chlorine using amount in a chlorine dioxide D<0>E<p>D<1> three-stage bleaching process is disclosed. The method adopts bagasse pulp as a raw material, adopts chlorine dioxide as the main bleaching agent, and adopts the D<0>E<p>D<1> three-stage bleaching process. In the D<0> stage, formaldehyde that is an auxiliary agent is added, the mass of the formaldehyde used is 0.6-1.5% of the mass of the absolute dry bagasse pulp, the mass of the chlorine dioxide used is 2.0% of the mass of the absolute dry bagasse pulp, the bleaching temperature is 65 DEG C, and the bleaching reaction time is 60 min. In the E<p> stage, the mass of sodium hydroxide used is 2.5% of the mass of the absolute dry bagasse pulp, the mass of hydrogen peroxide used is 1% of the mass of the absolute dry bagasse pulp, the bleaching temperature is 65 DEG C, and the bleaching reaction time is 90 min. In the D<1> stage, the mass of the chlorine dioxide used is 0.6% of the mass of the absolute dry bagasse pulp, the bleaching temperature is 75 DEG C, and the bleaching reaction time is 90 min. Compared with the prior art, the ISO whiteness of the bleached pulp is increased by 2.51-4.00%, and the using amount of effective chlorine in the chlorine dioxide is saved by about 10-25% for same pulp bleaching effects.

Description

Chlorine dioxide D0EpD1The method reducing chlorine dosage in tri-stage bleaching technique
Technical field
The present invention relates to clean pulping and paper-making field, especially a kind of chlorine dioxide D0EpD1 The method reducing chlorine dosage in tri-stage bleaching technique.
Background technology
Along with China's expanding economy, the requirement of Environmental protection is stricter, Efforts at environmental protection have become as the significant problem being related to pulp and paper industry survival and development.Cause This, it is necessary to develop pollution-free or oligosaprobic bleaching new technique, i.e. element-free chlorine (ECF) drift Bleach in vain or completely without chlorine (TCF).The main bleach that chlorine dioxide is bleached as ECF, tool There are the advantage of its uniqueness and wide application prospect.Owing to chlorine dioxide can optionally remove Lignin in slurry and seldom react with carbohydrate, can subtract while efficiently bleaching The generation of noxious substance in few waste water, is a kind of efficiently bleach meeting environmental requirement.Slurrying Papermaking enterprise use ECF bleaching technology based on chlorine dioxide can realize environment, economy and The unification of social benefit, is the correct selection of Paper Industry Development.Chlorine dioxide delignification and drift It is the core of ECF bleaching technology in vain, the typical case's short sequence drift bleached as element-free chlorine (ECF) Bai Liucheng chlorine dioxide D0EpD1Tri-stage bleaching, its process conditions are ripe, and improve and improve D0EpD1The focus of tri-stage bleaching chlorine dioxide delignification and bleaching efficiency always research, uses Add auxiliary agent and improve D0EpD1Tri-stage bleaching chlorine dioxide delignification and bleaching efficiency be can yet be regarded as Reduce the feasible method for bleaching of chlorine dioxide effective chlorine consumption.
Summary of the invention
The technical problem to be solved is to provide a kind of chlorine dioxide D0EpD1Three sections of drifts The method reducing chlorine dosage in white technique, to improve chlorine dioxide delignification and bleaching effect further Rate, saves chlorine dioxide effective chlorine consumption.
The present invention is with the following technical scheme above-mentioned technical problem of solution:
Chlorine dioxide D of the present invention0EpD1The method reducing chlorine dosage in tri-stage bleaching technique, it Operating procedure be:
First preparation bagasse pulp mass concentration is the bleaching environment of 10%, at chlorine dioxide D0EpD1 Tri-stage bleaching process conditions are as follows:
D0Duan Tianjia auxiliary agent formaldehyde, formaldehyde consumption is the 0.6～1.5% of over dry bagasse pulp quality, Chlorine is the 1.6～2.0% of over dry bagasse pulp quality, and bleaching temperature is 65 DEG C, drift The white response time is 60min；
Ep section sodium hydroxide concentration is the 2.5% of over dry bagasse pulp quality, and hydrogen peroxide consumption is exhausted The 1% of bagasse slurry quality, bleaching temperature is 65 DEG C, and the bleaching action time is 90min；
D1Section Chlorine is the 0.6% of over dry bagasse pulp quality, bleaching temperature is 75 DEG C, Bleaching action time 90min.
The inventive method compared with prior art, has the advantages that
The present invention is by ClO 2 bleaching D0Duan Tianjia auxiliary agent formaldehyde, starches after improve drift Whiteness, and then under same slurry bleaching effect, reduce chlorine dioxide effective chlorine consumption, carry High and improve ClO2Delignification and bleaching efficiency, cost-effective.
Detailed description of the invention
Below in conjunction with embodiment, the inventive method is described in further detail.
Embodiment 1, uses conventional process conditions to process:
1. ClO 2 bleaching:
Taking over dry bagasse pulp 10g, preparation bagasse pulp mass concentration is the bleaching environment of 10%, two Chlorine monoxid D0EpD1Tri-stage bleaching process conditions are as follows: D0Section is without auxiliary agent, chlorine dioxide Consumption is the 2.0%～2.2% of over dry bagasse pulp quality, and bleaching temperature is 65 DEG C, bleaching action Time is 60min；Ep section sodium hydroxide concentration is the 2.5% of over dry bagasse pulp quality, dioxygen Water consumption is the 1% of over dry bagasse pulp quality, and bleaching temperature is 65 DEG C, and the bleaching action time is 90min；D1Section Chlorine is the 0.6% of over dry bagasse pulp quality, and bleaching temperature is 75 DEG C, bleaching action time 90min.
2. pulp brightness detection after drift:
Taking the slurry that step 1 prepares, carry out ISO whiteness detection, testing result is as follows:
D0Section is without auxiliary agent, when Chlorine is the 2.0% of over dry bagasse pulp quality, and drift Disposed slurry ISO whiteness 80.09%；When Chlorine is the 2.2% of over dry bagasse pulp quality, Drift disposed slurry ISO whiteness 82.06%.
Embodiment 2, uses the inventive method to process:
1. ClO 2 bleaching:
Taking over dry bagasse pulp 10g, preparation bagasse pulp mass concentration is the bleaching environment of 10%, two Chlorine monoxid D0EpD1Tri-stage bleaching process conditions are as follows: D0Duan Tianjia auxiliary agent formaldehyde, formaldehyde is used Amount is the 0.6% of over dry bagasse pulp quality, and Chlorine is over dry bagasse pulp quality 2.0%, bleaching temperature is 65 DEG C, and the bleaching action time is 60min；Ep section sodium hydroxide is used Amount is the 2.5% of over dry bagasse pulp quality, and hydrogen peroxide consumption is the 1% of over dry bagasse pulp quality, Bleaching temperature is 65 DEG C, and the bleaching action time is 90min；D1Section Chlorine is exhausted The 0.6% of bagasse slurry quality, bleaching temperature is 75 DEG C, bleaching action time 90min.
2. identical with example 1 step 2.
Testing result: D0Duan Tianjia auxiliary agent formaldehyde, formaldehyde consumption is over dry bagasse pulp quality When 0.6%, drift disposed slurry ISO whiteness is 82.60%, with the drift disposed slurry ISO being not added with formaldehyde Whiteness 80.09% compares rising 3.13%；When reaching same bleaching effect, add auxiliary agent formaldehyde Slurry (D0Section Chlorine is the 2.0% of over dry bagasse pulp quality) ratio is not added with helping Slurry (the D of agent0Section Chlorine is the 2.2% of over dry bagasse pulp quality) D can be saved0 Section Chlorine 10%.
Embodiment 3, uses the inventive method to process:
1. ClO 2 bleaching:
Taking over dry bagasse pulp 10g, preparation bagasse pulp mass concentration is the bleaching environment of 10%, two Chlorine monoxid D0EpD1Tri-stage bleaching process conditions are as follows: D0Duan Tianjia auxiliary agent formaldehyde, formaldehyde is used Amount is the 1.5% of over dry bagasse pulp quality, and Chlorine is over dry bagasse pulp quality 1.6%～2.0%, bleaching temperature is 65 DEG C, and the bleaching action time is 60min；Ep section hydrogen-oxygen Changing sodium consumption is the 2.5% of over dry bagasse pulp quality, and hydrogen peroxide consumption is over dry bagasse pulp quality 1%, bleaching temperature is 65 DEG C, the bleaching action time is 90min；D1Section chlorine dioxide is used Amount is the 0.6% of over dry bagasse pulp quality, and bleaching temperature is 75 DEG C, the bleaching action time is 90min。
2. identical with example 1 step 2.
Testing result: D0Section is without auxiliary agent, and Chlorine is over dry bagasse pulp quality When 2.0%, float disposed slurry ISO whiteness 80.09%, D0Duan Tianjia auxiliary agent formaldehyde consumption is over dry Bagasse pulp quality 1.5% time, drift disposed slurry ISO whiteness is 84.09%, and is not added with formaldehyde Drift disposed slurry ISO whiteness 80.09% compare rising 4.99%；Chlorine is over dry sugarcane Slurry quality 1.6% time, D0The drift disposed slurry ISO whiteness 80.12% of Duan Tianjia auxiliary agent formaldehyde, When reaching same bleaching effect, add the slurry (D of auxiliary agent formaldehyde0Section Chlorine is The 1.6% of over dry bagasse pulp quality) than the slurry (D being not added with auxiliary agent0Section Chlorine It is the 2.0% of over dry bagasse pulp quality) D can be saved0Section Chlorine 25%.

Claims (1)

1. chlorine dioxide D0EpD1The method reducing chlorine dosage in tri-stage bleaching technique, its feature Being, its operating procedure is:
First preparation bagasse pulp mass concentration is the bleaching environment of 10%, at chlorine dioxide D0EpD1 Tri-stage bleaching process conditions are as follows:
D0Duan Tianjia auxiliary agent formaldehyde, formaldehyde consumption is the 0.6～1.5% of over dry bagasse pulp quality, Chlorine is the 1.6～2.0% of over dry bagasse pulp quality, and bleaching temperature is 65 DEG C, drift The white response time is 60min；
Ep section sodium hydroxide concentration is the 2.5% of over dry bagasse pulp quality, and hydrogen peroxide consumption is exhausted The 1% of bagasse slurry quality, bleaching temperature is 65 DEG C, and the bleaching action time is 90min；
D1Section Chlorine is the 0.6% of over dry bagasse pulp quality, bleaching temperature is 75 DEG C, Bleaching action time 90min.
CN201610243267.2A 2016-04-19 2016-04-19 A method of reducing a chlorine using amount in a chlorine dioxide D<0>E<p>D<1> three-stage bleaching process Pending CN105908552A (en)

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CN201610243267.2A CN105908552A (en) 2016-04-19 2016-04-19 A method of reducing a chlorine using amount in a chlorine dioxide D<0>E<p>D<1> three-stage bleaching process

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999047744A1 (en) * 1998-03-16 1999-09-23 Pulp And Paper Research Institute Of Canada Chlorine dioxide bleaching with additives
CN101545229A (en) * 2009-05-06 2009-09-30 广西大学 ClO2 bleaching method of bagasse pulp
CN104695267A (en) * 2015-03-26 2015-06-10 广西大学 AOX generation method for reducing bagasse pulp by adding bleaching auxiliary in chlorine dioxide bleaching process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999047744A1 (en) * 1998-03-16 1999-09-23 Pulp And Paper Research Institute Of Canada Chlorine dioxide bleaching with additives
CN101545229A (en) * 2009-05-06 2009-09-30 广西大学 ClO2 bleaching method of bagasse pulp
CN104695267A (en) * 2015-03-26 2015-06-10 广西大学 AOX generation method for reducing bagasse pulp by adding bleaching auxiliary in chlorine dioxide bleaching process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李文俊等: ""甲醛在竹浆ECF漂白中的应用探索"", 《中国造纸学报》 *

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