CN100372996C - Improved paper pulp bleaching process - Google Patents
Improved paper pulp bleaching process Download PDFInfo
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- CN100372996C CN100372996C CNB2005101358626A CN200510135862A CN100372996C CN 100372996 C CN100372996 C CN 100372996C CN B2005101358626 A CNB2005101358626 A CN B2005101358626A CN 200510135862 A CN200510135862 A CN 200510135862A CN 100372996 C CN100372996 C CN 100372996C
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Abstract
The present invention discloses an improved paper pulp bleaching process using reed pulp for making paper, which comprises that hypochlorite is added to carry out bleaching, and the bleaching process of the reed pulp adopts oxygen delignification bleaching in the first segment, adopts biologic enzyme bleaching in the second segment, and adopts hypochlorite bleaching in the third segment. The first segment adopting the oxygen delignification bleaching is carried out according to the following technological requirements: 8 to 20% of the pulp concentration, 85 to 130 DEG C of temperature, 1 to 4.5 kg/T of the pulp of an oxygen gas dosage, 1 to 4 kg/T of the pulp of an NaOH dosage and 0.1 to 1.0% of magnesium sulfate dosage; the second segment adopting the biologic enzyme bleaching is carried out according to the following technological requirements: 20 to 80 g/T of pulp of biologic enzyme addition, 30 to 80 DEG C of pulp temperature and 5 to 16% of pulp concentration, the pH value of the pulp is from 5 to 12, pulp hardness is from 2 to 8 (KMnO4), and time is from 0.5 to 4 hours. The bleaching process of the present invention can decrease bleachability, improve bleaching yields, decrease washing cleanliness and yellowing values, improve pulp strength, and solve the pollution problem of an ecological environment.
Description
Technical field
The invention belongs to paper pulp bleaching process, especially for the improved paper pulp bleaching process of reed pulp papermaking.
Background technology
In China many paper mills being arranged all is to use non-wood pulp papermaking, as: with Straw Pulp, rice straw pulp or reed pulp papermaking.The papermaking wastewater of non-wood pulp slurrying--black liquor, substantially obtain administering by the processing of firing method alkali recovery process, but association with pulp bleaching workshop section is because use chlorine and chloride are bleached slurry for mainly floating agent, these chlorine and chlorine-containing bleaching have been damaged paper pulp fiber, the yield and the pulp strength of slurry have been reduced, waste water can't second use, can only adopt the middle section water cleaning equipment to handle, and has increased production cost.The CEH bleaching process is adopted in the reed pulp bleaching, promptly first section is adopted chlorine (C) bleaching technology, second section employing alkali (E) extracting lignin bleaching technology, the 3rd section employing hypochlorite (H) bleaching technology, in bleaching section (stage casing) waste water, contain carcinogens such as dioxin, not only endangered environmental quality greatly, health has been constituted threat, and these chlorine and chlorine-containing bleaching damaged paper pulp fiber, causes slurry pulp washing degree and YI yellow index height, reduced the yield and the pulp strength of slurry.
Summary of the invention
The object of the present invention is to provide a kind of improved paper pulp bleaching process, adopt biology enzyme (X) bleaching technology and oxygen (O) delignification bleaching technology and hypochlorite (H) bleaching technology to form the OXH bleaching process, substitute original CEH bleaching process, can reduce bleachability, improve bleached stlck chest yield, reduce wash degree and YI yellow index, improve pulp strength, reduce pollution problem ecological environment.
The object of the present invention is achieved like this: a kind of improved paper pulp bleaching process, comprise the adding hypochlorite bleaching, and reed slurry bleaching process adopts oxygen delignification bleaching for first section, and second section is adopted the biology enzyme bleaching, and the 3rd section is adopted hypochlorite bleaching.
First section is adopted the technological requirement of oxygen delignification bleaching to be: slurry concentration 8-20%, temperature 85-130 ℃, purity are flow of oxygen 1-4.5kg/T slurry, NaOH consumption 1-4kg/T slurry, the magnesium sulfate consumption 0.1-1.0% of 100% content; Second section technological requirement that adopts the biology enzyme bleaching is that biology enzyme addition: 20-80g/T slurry, slurry temperature 30-80 ℃, slurry concentration 5-16%, slurry pH value 5-12, slurry hardness permanganate number are 2-8, time 0.5-4 hour; The 3rd section is adopted hypochlorite bleaching.
First section selection process that adopts oxygen delignification bleaching requires: slurry concentration 10-15%, temperature 90-120 ℃, purity are flow of oxygen 2-4kg/T slurry, NaOH consumption 2-3.5kg/T slurry, the magnesium sulfate consumption 0.3-0.9% of 100% content; Second section selection process of taking biology enzyme bleaching requires: biology enzyme addition 50-60g/T slurry, slurry temperature 50-70 ℃, slurry concentration 8-12%, slurry pH value 6-10, slurry hardness permanganate number are 4-6, time 1-2.5 hour.
Biology enzyme is zytase or laccase.
Zytase is: 1, inscribe-beta-xylanase; 2, circumscribed-beta-xylanase; 3, the poly-glycosides enzyme of β-wood.Porous reacts to paper pulp fiber inside and xylan, wood oligose, produces wood sugar.
Laccase is a kind of polyphenol oxidase, also is a kind of typical cupric glycoprotein, contains four copper ions in each laccase protein molecular, belongs to three classes, and wherein the I type is one, one on II type, two on III type.Copper ion in the laccase molecule is the activated centre of laccase catalytic reaction, plays a decisive role in catalytic oxidation process.
Bleaching process of the present invention is the OXH bleaching process, and wherein: the O section is that oxygen delignification bleaching, X section are that biology enzyme bleaching, H section are hypochlorite bleaching.Original C EH bleaching process is transformed into the OXH bleaching process.By reducing the consumption of hypochlorite, make total bleachability drop to 1.0-4.5% from 7.5%.Bleachability descends, and has reduced the addition of Ca ion, and can reduce fiber degradation, improves pulp strength.After adopting OXH biology enzyme bleaching technology, the COD of the waste water of OXH is than the COD decline 1000-2000mg/L of the waste water of former CEH bleaching process.The minimizing of the waste water COD content of bleaching illustrates that the slurry loss is few, the bleached stlck chest yield height.Owing to adopt the OXH bleaching process to replace former CEH bleaching process, reduced the organic generation of chlorination source widely, in waste water, reduced the carcinogen that contains dioxin etc. significantly, reduced pollution problem to ecological environment.
The specific embodiment
The present invention is with the raw material of reed as production paper grade (stock) bleached fiber, after the cut-out of reed process, the dedusting, adds steaming preparation, under the condition of High Temperature High Pressure, reed is resolved into fiber, pass through cleaning procedure again, extract the fiber of bleaching usefulness, enter bleachery.First section of former CEH bleaching process is adopted chlorine (C) bleaching technology, second section employing alkali (E) extracting lignin bleaching technology, the 3rd section employing hypochlorite (H) bleaching technology.Bleaching process of the present invention adopts OXH biology enzyme bleaching process, and first section is adopted oxygen (O) delignification bleaching technology, second section employing biology enzyme (X) bleaching technology, the 3rd section employing hypochlorite (H) to bleach.
Embodiment 1: with bleaching process bleaching reed pulp of the present invention, its step is as follows:
1, first section: adopt oxygen delignification bleaching, slurry concentration 8%, 130 ℃ of temperature, purity are the flow of oxygen 4.5kg/t slurry of 100% content, NaOH consumption 4kg/t slurry, magnesium sulfate 1.0%, water flush away residue;
2, second section: the addition that the reed pulp concentration after the washing is 16%, add biology enzyme is that 80g/T slurry, slurry temperature are that 80 ℃, slurry pH value are 12, oar material hardness permanganate number is 8, the time is 4 hours, wash with water then, wash the dereaction residue with water.
3, the 3rd section: adopt the bleaching of hypochlorous acid calcium salt, slurry concentration 15%, bleachability 4.5%, 45 ℃ of temperature, 4.5 hours time, float back pH value 7.5, wash the dereaction residue with water.
After tested: wash degree is that 15.72mgN/L, PC value (YI yellow index) are 2%, breaking length (m) is 4387, folding (inferior) is 15.
The data that adopt CEH bleaching process bleaching reed pulp to test are: wash degree is that 18.55mgN/L, PC value (YI yellow index) are 2.3%, breaking length (m) is 3787, folding (inferior) is 5.
From the data of two kinds of technology comparison production test of embodiment 1 as can be seen, the former CEH bleaching process of bleaching process of the present invention has reduced wash degree and PC value (YI yellow index), and the fracture length of reed fiber and folding number increase have improved pulp strength.
Embodiment 2
With bleaching process bleaching reed pulp of the present invention, its step is as follows:
1, first section: adopt oxygen delignification bleaching, slurry concentration 14%, 125 ℃ of temperature, purity are the flow of oxygen 1.8kg/t slurry of 100% content, NaOH consumption 1.5kg/t slurry, behind the magnesium sulfate 0.3%, water flush away residue;
2, second section: the addition that the reed pulp concentration after the washing is 5%, add biology enzyme is that 40g/T slurry, slurry temperature are that 50 ℃, slurry pH value are 10, oar material hardness permanganate number is 4, the time is 0.5 hour, wash with water then, wash the dereaction residue with water.
3, the 3rd section: adopt the bleaching of hypochlorous acid calcium salt, slurry concentration 8%, bleachability 1.8%, 35 ℃ of temperature, 1.5 hours time, float back pH value 8, wash the dereaction residue with water.
After tested: wash degree is that 14.84mgN/L, PC value (YI yellow index) are 2.48%, breaking length (m) is 4260, folding (inferior) is 10.
Adopt OH
1H
2The data that bleaching process bleaching reed pulp is tested are: wash degree is 18.62, PC value (YI yellow index) is 3.2, breaking length (M) is 3779, folding (inferior) is 8.
From the data of two kinds of technology comparison production test of embodiment 2 as can be seen, bleaching process of the present invention has reduced wash degree and PC value (YI yellow index) than former CEH bleaching process, and the fracture length of reed fiber and folding number increase have improved pulp strength.
Claims (3)
1. improved paper pulp bleaching process, comprise that reed slurry bleaching process adopts oxygen delignification bleaching for first section, second section is adopted the biology enzyme bleaching, the 3rd section is adopted hypochlorite bleaching, it is characterized in that: first section technological requirement that adopts oxygen delignification bleaching is that slurry concentration 8-20%, temperature 85-130 ℃, purity are flow of oxygen 1-4.5kg/T slurry, NaOH consumption 1-4kg/T slurry, the magnesium sulfate consumption 0.1-1.0% of 100% content; Second section is adopted the technological requirement of biology enzyme bleaching to be: biology enzyme addition 20-80g/T slurry, slurry temperature 30-80 ℃, slurry concentration 5-16%, slurry pH value 5-12, slurry hardness permanganate number are 2-8, time 0.5-4 hour.
2. improved paper pulp bleaching process according to claim 1 is characterized in that: first section technological requirement that adopts oxygen delignification bleaching is that slurry concentration 10-15%, temperature 90-120 ℃, purity are flow of oxygen 2-4kg/T slurry, NaOH consumption 2-3.5kg/T slurry, the magnesium sulfate consumption 0.3-0.9% of 100% content; Take the technological requirement of biology enzyme bleaching to be for second section: biology enzyme addition 50-60g/T slurry, slurry temperature 50-70 ℃, slurry concentration 8-12%, slurry pH value 6-10, slurry hardness permanganate number are 4-6, time 1-2.5 hour.
3. improved paper pulp bleaching process according to claim 1 and 2 is characterized in that: biology enzyme is zytase or laccase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101358626A CN100372996C (en) | 2005-12-20 | 2005-12-20 | Improved paper pulp bleaching process |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101358626A CN100372996C (en) | 2005-12-20 | 2005-12-20 | Improved paper pulp bleaching process |
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| CN1804210A CN1804210A (en) | 2006-07-19 |
| CN100372996C true CN100372996C (en) | 2008-03-05 |
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| CNB2005101358626A Expired - Fee Related CN100372996C (en) | 2005-12-20 | 2005-12-20 | Improved paper pulp bleaching process |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101200863B (en) * | 2006-12-11 | 2010-11-03 | 福建农林大学 | Method for promoting removal rate, whiteness and viscosity of oxygen delignification by STPP |
| CN101864687B (en) * | 2010-05-27 | 2013-03-27 | 岳阳纸业股份有限公司 | Reed pulp bleaching technology |
| CN102182094B (en) * | 2011-04-12 | 2012-03-14 | 山东轻工业学院 | Salix mongolica sulfate pulp bleaching process |
| CN103061185B (en) * | 2012-12-21 | 2016-03-02 | 新疆博湖苇业股份有限公司 | Paper pulp fully chlorine-free bleaching method |
| CN109811580B (en) * | 2019-03-13 | 2021-08-03 | 内蒙古科技大学 | Biological paper pulp taking peanut shells and reed as raw materials and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0386888A2 (en) * | 1989-02-10 | 1990-09-12 | ICI Canada Inc. | Oxygen delignification and enzyme treatment |
| WO1991005908A1 (en) * | 1989-10-18 | 1991-05-02 | International Paper Company | Method for bleaching with reduced organic chlorides |
| JPH10131090A (en) * | 1996-10-25 | 1998-05-19 | Oji Paper Co Ltd | Cast coated paper and its production |
-
2005
- 2005-12-20 CN CNB2005101358626A patent/CN100372996C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0386888A2 (en) * | 1989-02-10 | 1990-09-12 | ICI Canada Inc. | Oxygen delignification and enzyme treatment |
| WO1991005908A1 (en) * | 1989-10-18 | 1991-05-02 | International Paper Company | Method for bleaching with reduced organic chlorides |
| JPH10131090A (en) * | 1996-10-25 | 1998-05-19 | Oji Paper Co Ltd | Cast coated paper and its production |
Non-Patent Citations (3)
| Title |
|---|
| 木聚糖酶在稻草浆漂白中的应用. 高慧，丁佐龙，潘祖耀.安徽农业大学学报，第25卷第3期. 1998 * |
| 硫酸盐苇浆含酶预处理的全无氯漂白. 詹怀宇，岳保珍，胡伟健，黄伟锋.中国造纸学报，第12卷. 1997 * |
| 聚木糖酶用于硫酸盐浆漂前处理. 于伟东，陈中豪，余惠生.纸和造纸，第2期. 1999 * |
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