CN105200836A - Method for performing ECF bleaching on bamboo pulp with assistance of bio-enzyme pretreatment - Google Patents
Method for performing ECF bleaching on bamboo pulp with assistance of bio-enzyme pretreatment Download PDFInfo
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- CN105200836A CN105200836A CN201510615793.2A CN201510615793A CN105200836A CN 105200836 A CN105200836 A CN 105200836A CN 201510615793 A CN201510615793 A CN 201510615793A CN 105200836 A CN105200836 A CN 105200836A
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- laccase
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Abstract
The invention discloses a method for performing ECF bleaching on bamboo pulp with assistance of bio-enzyme pretreatment. The method includes the first step of xylanase pretreatment, the second step of laccase pretreatment and the third step of ECF bleaching, wherein the third step of ECF bleaching includes the procedures of D0-stage bleaching, EP-stage alkali extraction and D1-stage bleaching. By means of the method, the whiteness of bleached bamboo pulp is increased by 9.1%-15.3%, the AOX formation quantity of bleaching wastewater is lowered by 26.9%-38.6%, and pollution to the environment is reduced. Compared with the prior art, the method has the advantages of increasing the whiteness of sulphate bamboo pulp bleached in an ECF mode, lowering the AOX formation quantity of bleaching wastewater, reducing pollution to the environment and enabling wastewater discharge of pulping and papermaking enterprises to meet wastewater discharge requirements of new national standards of China.
Description
Technical field
The invention belongs to enterprises in pulp and paper industry association with pulp bleaching technology field, be specifically related to a kind of method that biology enzyme preliminary treatment assists bamboo pulp ECF to bleach.
Background technology
Along with the increasingly stringent of environmental protection; traditional chemical method for bleaching is eliminated comparatively greatly to environmental hazard gradually because of it; traditional chloride three sections of CEH or H single stage bleachings produce many poisonous and harmful substances; serious environment pollution and the mankind; tradition bleaching mainly in its chloro-bleaching effluents the pollution problem of Adsorbable organic halogens (being called for short AOX) the most serious; research both at home and abroad about AOX Decrement Technique is a lot, by adding chemicals and can directly suppress or the generation of control AOX.In recent years; the increasingly stringent of environmental protection makes the bleaching of paper pulp bleach future development to element-free chlorine (ECF) with completely without chlorine (TCF) gradually; and ECF method for bleaching not only can control the generation of harmful substance in bleaching effluent (as AOX etc.); more can save the consumption of bleaching chemicals, extremely friendly to environment.
Bamboo is as one of important non-wood material, it is the important pulping and paper-making raw material of the countries such as China, India, Philippine, bamboo has fast, the easy breeding of growth, output high, its fibre morphology and chemical constituent all show good pulpability, but bamboo belongs to hard bleach pulp kind, and add biology enzyme and can optimize association with pulp bleaching, save chemistry drift agent, therefore study biology enzyme and be used for bleaching technology, for these countries, there is importance.Along with the demand of China's paper product constantly increases, the timber papermaking raw material of China can not meet Production requirement, so, it is very urgent that development and application non-wood material is used for pulping and paper-making, development bamboo pulp is not only the effective way solving China's paper industry imbalance between supply and demand, adjust the powerful measure of China's pulping and paper-making industry raw material mix especially, greatly developing bamboo is that the production of raw-material pulping and paper-making can promote the quick of China's paper industry and develop in a healthy way.
Summary of the invention
The object of this invention is to provide a kind of method that biology enzyme preliminary treatment assists bamboo pulp ECF to bleach, be intended to the whiteness improving bamboo pulp, reduce the formation volume of bleaching process AOX, reach the object that paper pulp papermaking enterprise reduces environmental pollution.
The technical scheme that the present invention solves the problems of the technologies described above is as follows:
A kind of method that biology enzyme preliminary treatment assists bamboo pulp ECF to bleach comprises the following steps, i.e. xylanase pretr eatment, laccase preliminary treatment and ECF bleaching.
1. xylanase pretr eatment
Be 9% by sulfate bamboo pulp quality of regulation concentration of not floating clean for washing and screening, and deliver to biology enzyme pretreater and carry out biology enzyme preliminary treatment, obtain the pretreated sulfate bamboo pulp of biology enzyme, the process conditions of xylanase pretr eatment are: treatment temperature is 60 ~ 70 DEG C, enzyme dosage 10 ~ 20IU/g, reaction time 90min.
2. laccase preliminary treatment
By the sulfate bamboo pulp washes clean after the process of step 1 xylan, sulfate bamboo pulp mass concentration is regulated to be 9%, then send into laccase pretreater to react, add laccase amboceptor HBT (I-hydroxybenzotriazole) and Tween 80, the pretreated process conditions of laccase are: treatment temperature 50 ~ 60 DEG C, enzyme dosage 15 ~ 25IU/g, HBT consumption is 1.5% of oven dry stock quality, Tween 80 consumption is 0.15% of oven dry stock quality, and oxygen pressure is 0.3MP, reaction time 120min.
3.ECF bleaching comprises D
0section bleaching, E
psection alkali density and D
1section bleaching:
1) D
0section bleaching: sulfate bamboo pulp out regulates bamboo pulp mass concentration to be 9% after washing after the preliminary treatment of step 2 laccase, then chlorine dioxide is added, ClO 2 bleaching tower is entered after abundant mixing, its technique is: Chlorine is 3.5% of bamboo pulp absolute dry mass, bleaching temperature is 60 ~ 70 DEG C, every 10 ~ 15min to slurry rubbing once, the reaction time is 90min.
2) E
psection alkali density: D
0after section bleaching action terminates, totally bamboo pulp mass concentration is regulated to be 9% afterwards slurry washing, carry out alkali density, its technique is: sodium hydroxide concentration, hydrogen peroxide use, magnesium sulfate consumption, EDTA consumption are respectively 2%, 1%, 0.5%, 0.3% of bamboo pulp absolute dry mass, extraction temperature is 65 ~ 75 DEG C, every 10 ~ 15min to slurry rubbing once, the reaction time is 100min.
3) D
1section bleaching: E
pafter the reaction of section alkali density terminates, totally bamboo pulp mass concentration is regulated to be 9% afterwards slurry washing, add chlorine dioxide, ClO 2 bleaching tower is entered after abundant mixing, its process conditions are: Chlorine is 1.5% of bamboo pulp absolute dry mass, bleaching temperature is 80 ~ 90 DEG C, and every 10 ~ 15min to slurry rubbing once, the reaction time is 120min.
Through step 1) xylanase pretr eatment, step 2) laccase preliminary treatment and step 3) after the drift that obtains after ECF bleaching bamboo pulp compared with traditional E CF bleaching process, when the consumption of chlorine dioxide is identical, after the inventive method can make drift, the whiteness of bamboo pulp improves 9.1% ~ 15.3%, and the AOX formation volume of bleaching effluent reduces 26.9% ~ 38.6%, decreases the pollution to environment.
Above-mentioned zytase model is NKX3, and laccase extracts from whiterot fungi, and xylanase activity is 500U/ml, and laccase activity is 3510U/ml.
Above-mentioned laccase amboceptor HBT (I-hydroxybenzotriazole) and Tween 80 are purchased from Shanghai Aladdin Reagent Company.
Compared with prior art, the present invention has the following advantages:
The inventive method improves the whiteness of ECF bleached sulphate bamboo pulp, reduces the formation volume of bleaching effluent AOX, decreases the pollution to environment, makes enterprises in pulp and paper industry discharge of wastewater meet China's new national standard and waste water is sent a manuscript to the compositor to the requirement of putting.
Detailed description of the invention
Present invention employs the collaborative preliminary treatment of tour that zytase and laccase are bleached at ECF bamboo pulp, zytase can decompose the hemicellulose fraction in LCC complex molecules, contribute to the stripping of residual lignin, reduce bleaching chemicals consumption, in addition, laccase has higher selective to lignin, can direct xylogen degradation.Zytase and laccase carry out ECF bleaching after combining and carrying out collaborative preliminary treatment again, can greatly improve delignification efficiency, improve paper pulp bleachability and improve pulp property; improve the whiteness of the rear bamboo pulp of drift; reduce the AOX formation volume of bleaching effluent, decreasing pollution, is conducive to the protection of environment.
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
The method that biology enzyme preliminary treatment assists bamboo pulp ECF to bleach, operating procedure is as follows:
1. xylanase pretr eatment
Be 9% by sulfate bamboo pulp quality of regulation concentration of not floating clean for washing and screening, and deliver to pretreater and carry out biology enzyme preliminary treatment, obtain the pretreated sulfate bamboo pulp of biology enzyme, the process conditions of xylanase pretr eatment are: treatment temperature is 60 DEG C, enzyme dosage 10IU/g, reaction time 90min.
2. laccase preliminary treatment
By the sulfate bamboo pulp washes clean after the process of step 1 xylan, sulfate bamboo pulp mass concentration is regulated to be 9%, then send into laccase pretreater to react, add laccase amboceptor HBT (I-hydroxybenzotriazole) and Tween 80, the pretreated process conditions of laccase are: treatment temperature 50 DEG C, enzyme dosage 15IU/g, HBT consumption is 1.5% of oven dry stock quality, Tween 80 consumption is 0.15% of oven dry stock quality, and oxygen pressure is 0.3MP, reaction time 120min.
3.ECF bleaches
ECF bleaching is divided into D
0section bleaching, E
psection alkali density and D
1section bleaching:
1) D
0section bleaching: bamboo pulp out regulates bamboo pulp mass concentration to be 9% after washing after the preliminary treatment of step 2 laccase, then chlorine dioxide is added, ClO 2 bleaching tower is entered after abundant mixing, its technique is: Chlorine is 3.5% of bamboo pulp absolute dry mass, bleaching temperature is 60 DEG C, every 10 ~ 15min to slurry rubbing once, the reaction time is 90min.
2) E
psection alkali density: D
0after section bleaching action terminates, totally bamboo pulp mass concentration is regulated to be 9% afterwards slurry washing, carry out alkali density, its technique is: sodium hydroxide concentration, hydrogen peroxide use, magnesium sulfate consumption, EDTA consumption are respectively 2%, 1%, 0.5%, 0.3% of bamboo pulp absolute dry mass, extraction temperature is 65 DEG C, every 10 ~ 15min to slurry rubbing once, the reaction time is 100min.
3) D
1section bleaching: E
pafter the reaction of section alkali density terminates, totally bamboo pulp mass concentration is regulated to be 9% afterwards slurry washing, add chlorine dioxide, ClO 2 bleaching tower is entered after abundant mixing, its process conditions are: Chlorine is 1.5% of bamboo pulp absolute dry mass, bleaching temperature is 80 DEG C, and every 10 ~ 15min to slurry rubbing once, the reaction time is 120min.
Compared with traditional E CF bleaching process, when the consumption of chlorine dioxide is identical, after the inventive method can make drift, the whiteness of bamboo pulp improves 9.1%, and the AOX formation volume of bleaching effluent reduces 26.9%, decreases the pollution to environment.
Embodiment 2
The method that biology enzyme preliminary treatment assists bamboo pulp ECF to bleach, operating procedure is as follows:
1. xylanase pretr eatment
Be 9% by sulfate bamboo pulp quality of regulation concentration of not floating clean for washing and screening, and deliver to pretreater and carry out biology enzyme preliminary treatment, obtain the pretreated sulfate bamboo pulp of biology enzyme, the process conditions of xylanase pretr eatment are: treatment temperature is 65 DEG C, enzyme dosage 15IU/g, reaction time 90min.
2. laccase preliminary treatment
By the sulfate bamboo pulp washes clean after the process of step 1 xylan, sulfate bamboo pulp mass concentration is regulated to be 9%, then send into laccase pretreater to react, add laccase amboceptor HBT (I-hydroxybenzotriazole) and Tween 80, the pretreated process conditions of laccase are: treatment temperature 55 DEG C, enzyme dosage 20IU/g, HBT consumption is 1.5% of oven dry stock quality, Tween 80 consumption is 0.15% of oven dry stock quality, and oxygen pressure is 0.3MP, reaction time 120min.
3.ECF bleaches
ECF bleaching is divided into D
0section bleaching, E
psection alkali density and D
1section bleaching:
1) D
0section bleaching: bamboo pulp out regulates bamboo pulp mass concentration to be 9% after washing after the preliminary treatment of step 2 laccase, then chlorine dioxide is added, ClO 2 bleaching tower is entered after abundant mixing, its technique is: Chlorine is 3.5% of bamboo pulp absolute dry mass, bleaching temperature is 65 DEG C, every 10 ~ 15min to slurry rubbing once, the reaction time is 90min.
2) E
psection alkali density: D
0after section bleaching action terminates, totally bamboo pulp mass concentration is regulated to be 9% afterwards slurry washing, carry out alkali density, its technique is: sodium hydroxide concentration, hydrogen peroxide use, magnesium sulfate consumption, EDTA consumption are respectively 2%, 1%, 0.5%, 0.3% of bamboo pulp absolute dry mass, extraction temperature is 70 DEG C, every 10 ~ 15min to slurry rubbing once, the reaction time is 100min.
3) D
1section bleaching: E
pafter the reaction of section alkali density terminates, totally bamboo pulp mass concentration is regulated to be 9% afterwards slurry washing, add chlorine dioxide, ClO 2 bleaching tower is entered after abundant mixing, its process conditions are: Chlorine is 1.5% of bamboo pulp absolute dry mass, bleaching temperature is 85 DEG C, and every 10 ~ 15min to slurry rubbing once, the reaction time is 120min.
Compared with traditional E CF bleaching process, when the consumption of chlorine dioxide is identical, after the inventive method can make drift, the whiteness of bamboo pulp improves 12.7%, and the AOX formation volume of bleaching effluent reduces 34.3%, decreases the pollution to environment.
Embodiment 3
The method that biology enzyme preliminary treatment assists bamboo pulp ECF to bleach, operating procedure is as follows:
1. xylanase pretr eatment
Be 9% by sulfate bamboo pulp quality of regulation concentration of not floating clean for washing and screening, and deliver to pretreater and carry out biology enzyme preliminary treatment, obtain the pretreated sulfate bamboo pulp of biology enzyme, the process conditions of xylanase pretr eatment are: treatment temperature is 70 DEG C, enzyme dosage 20IU/g, reaction time 90min.
2. laccase preliminary treatment
By the sulfate bamboo pulp washes clean after the process of step 1 xylan, sulfate bamboo pulp mass concentration is regulated to be 9%, then send into laccase pretreater to react, add laccase amboceptor HBT (I-hydroxybenzotriazole) and Tween 80, the pretreated process conditions of laccase are: treatment temperature 60 DEG C, enzyme dosage 25IU/g, HBT consumption is 1.5% of oven dry stock quality, Tween 80 consumption is 0.15% of oven dry stock quality, and oxygen pressure is 0.3MP, reaction time 120min.
3.ECF bleaches
ECF bleaching is divided into D
0section bleaching, E
psection alkali density and D
1section bleaching:
1) D
0section bleaching: bamboo pulp out regulates bamboo pulp mass concentration to be 9% after washing after the preliminary treatment of step 2 laccase, then chlorine dioxide is added, ClO 2 bleaching tower is entered after abundant mixing, its technique is: Chlorine is 3.5% of bamboo pulp absolute dry mass, bleaching temperature is 70 DEG C, every 10 ~ 15min to slurry rubbing once, the reaction time is 90min.
2) E
psection alkali density: D
0after section bleaching action terminates, totally bamboo pulp mass concentration is regulated to be 9% afterwards slurry washing, carry out alkali density, its technique is: sodium hydroxide concentration, hydrogen peroxide use, magnesium sulfate consumption, EDTA consumption are respectively 2%, 1%, 0.5%, 0.3% of bamboo pulp absolute dry mass, extraction temperature is 75 DEG C, every 10 ~ 15min to slurry rubbing once, the reaction time is 100min.
3) D
1section bleaching: E
pafter the reaction of section alkali density terminates, totally bamboo pulp mass concentration is regulated to be 9% afterwards slurry washing, add chlorine dioxide, ClO 2 bleaching tower is entered after abundant mixing, its process conditions are: Chlorine is 1.5% of bamboo pulp absolute dry mass, bleaching temperature is 90 DEG C, and every 10 ~ 15min to slurry rubbing once, the reaction time is 120min.
Compared with traditional E CF bleaching process, when the consumption of chlorine dioxide is identical, after the inventive method can make drift, the whiteness of bamboo pulp improves 15.3%, and the AOX formation volume of bleaching effluent reduces 38.6%, decreases the pollution to environment.
Claims (1)
1. a biology enzyme preliminary treatment method of assisting bamboo pulp ECF to bleach, is characterized in that: comprise the following steps, i.e. xylanase pretr eatment, laccase preliminary treatment and ECF bleaching;
1) xylanase pretr eatment:
Be 9% by sulfate bamboo pulp quality of regulation concentration of not floating clean for washing and screening, and deliver to pretreater and carry out biology enzyme preliminary treatment, obtain the pretreated sulfate bamboo pulp of biology enzyme, the process conditions of xylanase pretr eatment are: treatment temperature is 60 ~ 70 DEG C, enzyme dosage 10 ~ 20IU/g, reaction time 90min;
2) laccase preliminary treatment
By the sulfate bamboo pulp washes clean after the process of step 1 xylan, sulfate bamboo pulp mass concentration is regulated to be 9%, then send into laccase pretreater to react, add laccase amboceptor HBT and Tween 80, the pretreated process conditions of laccase are: treatment temperature 50 ~ 60 DEG C, enzyme dosage 15 ~ 25IU/g, HBT consumption is 1.5% of oven dry stock quality, Tween 80 consumption is 0.15% of oven dry stock quality, and oxygen pressure is 0.3MP, reaction time 120min;
3) ECF bleaching
ECF bleaching comprises D
0section bleaching, E
psection alkali density and D
1section bleaching:
(1) D
0section bleaching: sulfate bamboo pulp out regulates bamboo pulp mass concentration to be 9% after washing after the preliminary treatment of step 2 laccase, then chlorine dioxide is added, ClO 2 bleaching tower is entered after abundant mixing, its technique is: Chlorine is 3.5% of bamboo pulp absolute dry mass, bleaching temperature is 60 ~ 70 DEG C, every 10 ~ 15min to slurry rubbing once, the reaction time is 90min;
(2) E
psection alkali density: D
0after section bleaching action terminates, totally bamboo pulp mass concentration is regulated to be 9% afterwards slurry washing, carry out alkali density, its technique is: sodium hydroxide concentration, hydrogen peroxide use, magnesium sulfate consumption, EDTA consumption are respectively 2%, 1%, 0.5%, 0.3% of bamboo pulp absolute dry mass, extraction temperature is 65 ~ 75 DEG C, every 10 ~ 15min to slurry rubbing once, the reaction time is 100min;
(3) D
1section bleaching: E
pafter the reaction of section alkali density terminates, totally bamboo pulp mass concentration is regulated to be 9% afterwards slurry washing, add chlorine dioxide, ClO 2 bleaching tower is entered after abundant mixing, its process conditions are: Chlorine is 1.5% of bamboo pulp absolute dry mass, bleaching temperature is 80 ~ 90 DEG C, and every 10 ~ 15min to slurry rubbing once, the reaction time is 120min;
Through step 1) xylanase pretr eatment, step 2) laccase preliminary treatment and step 3) after bamboo pulp and traditional E CF bleaching process obtain after the drift that obtains after ECF bleaching drift compared with bamboo pulp, when the consumption of chlorine dioxide is the same, after the inventive method can make drift, the whiteness of bamboo pulp improves 9.1% ~ 15.3%, and the AOX formation volume of bleaching effluent reduces 26.9% ~ 38.6%, decreases the pollution to environment.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107974854A (en) * | 2017-11-23 | 2018-05-01 | 华南理工大学 | A kind of method using biology enzyme/amino acid system pretreatment auxiliary pulp from decoloured waste paper hydrogen peroxide bleaching |
| CN115074986A (en) * | 2022-06-14 | 2022-09-20 | 杭州可靠护理用品股份有限公司 | Bleaching method of bamboo pulp fibers suitable for paper diaper absorber |
| CN116423602A (en) * | 2023-03-30 | 2023-07-14 | 陕西科技大学 | Green and efficient ECF bleaching method |
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| US20040077071A1 (en) * | 2001-01-18 | 2004-04-22 | Tolan Jeffrey S. | Methods of xylanase treatment in bleaching |
| CN104195859A (en) * | 2014-09-23 | 2014-12-10 | 广西大学 | Method for bioenzyme-assisted chlorine dioxide bleaching of bagasse pulp |
| CN104389222A (en) * | 2014-09-23 | 2015-03-04 | 广西大学 | ECF bleaching method for reducing AOX formation amount |
| CN104404807A (en) * | 2014-09-23 | 2015-03-11 | 广西大学 | Method for reducing AOX forming amount in chlorine dioxide bleaching process of bagasse pulp |
| CN104695266A (en) * | 2015-03-26 | 2015-06-10 | 广西大学 | Method using biological enzymes to assist ECF bleaching of bamboo pulp |
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2015
- 2015-09-24 CN CN201510615793.2A patent/CN105200836A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040077071A1 (en) * | 2001-01-18 | 2004-04-22 | Tolan Jeffrey S. | Methods of xylanase treatment in bleaching |
| CN104195859A (en) * | 2014-09-23 | 2014-12-10 | 广西大学 | Method for bioenzyme-assisted chlorine dioxide bleaching of bagasse pulp |
| CN104389222A (en) * | 2014-09-23 | 2015-03-04 | 广西大学 | ECF bleaching method for reducing AOX formation amount |
| CN104404807A (en) * | 2014-09-23 | 2015-03-11 | 广西大学 | Method for reducing AOX forming amount in chlorine dioxide bleaching process of bagasse pulp |
| CN104695266A (en) * | 2015-03-26 | 2015-06-10 | 广西大学 | Method using biological enzymes to assist ECF bleaching of bamboo pulp |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107974854A (en) * | 2017-11-23 | 2018-05-01 | 华南理工大学 | A kind of method using biology enzyme/amino acid system pretreatment auxiliary pulp from decoloured waste paper hydrogen peroxide bleaching |
| CN107974854B (en) * | 2017-11-23 | 2020-09-22 | 华南理工大学 | Method for assisting hydrogen peroxide bleaching of waste paper deinking pulp through pretreatment of biological enzyme/amino acid system |
| CN115074986A (en) * | 2022-06-14 | 2022-09-20 | 杭州可靠护理用品股份有限公司 | Bleaching method of bamboo pulp fibers suitable for paper diaper absorber |
| CN115074986B (en) * | 2022-06-14 | 2023-11-14 | 杭州可靠护理用品股份有限公司 | Bleaching method of bamboo pulp fiber suitable for paper diaper absorber |
| CN116423602A (en) * | 2023-03-30 | 2023-07-14 | 陕西科技大学 | Green and efficient ECF bleaching method |
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