CN105239436A - Chlorine-free bleaching technology of paper pulp - Google Patents
Chlorine-free bleaching technology of paper pulp Download PDFInfo
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- CN105239436A CN105239436A CN201510645503.9A CN201510645503A CN105239436A CN 105239436 A CN105239436 A CN 105239436A CN 201510645503 A CN201510645503 A CN 201510645503A CN 105239436 A CN105239436 A CN 105239436A
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Abstract
The invention discloses a chlorine-free bleaching technology of paper pulp. The paper pulp is bleached and washed through beta-mannanase, oxygen delignification, hydrogen peroxide and mixed peroxy acid under specific reaction conditions step by step. The beta-mannanase is used to carry out preliminary bleaching, so parts of precipitated xylan can be removed, and the gap of the paper pulp matrix is increased, thereby bleaching agents used in the later stage can effectively infiltrate into the paper pulp to act; and oxygen delignification, hydrogen peroxide and mixed peroxy acid bleaching are carried out under strict controlled reaction conditions, so the stability of the whiteness of the paper pulp is increased, the respective content of lignin and hexenuronic acid in the paper pulp is reduced, the rebleaching operation and the rebleaching cost are omitted, the slurry obtained after the reaction contains no chlorine-containing compounds and has no pollution to environment, and relevant reagents can be repeatedly used.
Description
Technical field
The invention belongs to rice paper manufacturing technology field, be specifically related to a kind of chlorine-free bleaching technique of paper pulp.
Background technology
Association with pulp bleaching is by the process of true qualities paper pulp bleaching agent, to deviate from paper pulp coloring matter and other foreign material to improve whiteness and purity.Paper pulp bleaching agent conventional is at present chlorine, hypochlorite and chlorine dioxide, it has abundance, advantage simple to operate, but Bleaching Quality is poor, but the CHCl3 produced in chlorination process has carcinogenesis, in addition, also having a lot of organic chloride to produce, is all the chloride that lignin degradation produces, and is wherein maximum with various chlorinated phenol, be noxious material, and not easily carry out biological decomposition and abiotic decomposition.
Along with the whole world is to the pay attention to day by day of preserving the ecological environment, the harm caused in conventional bleaching waste water be familiar with by people, and the chlorine-free bleaching contaminated wastewater of paper pulp and carry out bleach clean-up produce key point.
Summary of the invention
The object of the invention is for existing problem, provide a kind of chlorine-free bleaching technique of paper pulp.
The present invention is achieved by the following technical solutions: a kind of chlorine-free bleaching technique of paper pulp, comprises the following steps:
(1) in body paper slurry, add 'beta '-mannase and carry out just one-Step bleach;
(2), after rinsed with clear water, oxygen delignification bleaching is added;
(3) paper pulp through preliminary treatment is put into pressure reactor, in nitrogen environment, add hydrogen peroxide bleaching;
(4) mixing peroxy acid is utilized to bleach;
(5), after washing, copy paper operation is entered.
As further improvement of these options, described in step (1), the consumption of 'beta '-mannase is 2% of pulp weight, and pH value is 3.5-4.5, and temperature remains on 55-65 DEG C, and the time is 2-4 hour.
As further improvement of these options, in step (2), temperature is 100-110 DEG C, and flow of oxygen is the consumption of 2%, NaOH of pulp weight is 4 ‰, MgSO of pulp weight
4consumption be 0.3-0.6wt%, the time is 20-40 minute.
As further improvement of these options, in step (3), the concentration of hydrogen peroxide is 37.5%, and use amount is 2% of pulp weight, and air pressure is 280KPa, and reaction temperature is 130-150 DEG C, and pH value is 8-10, and the time is 1-2 hour.
As further improvement of these options, mixing peroxy acid described in step (4) is peroxosulphuric and Peracetic Acid, add that quality is respectively pulp weight 8 ‰ and 4 ‰, and pH value is 4-5, and temperature is 50-70 DEG C, and the time is 80-150 minute.
The present invention has the following advantages compared to existing technology: utilize 'beta '-mannase to carry out just one-Step bleach, partly precipitated xylan can be removed, increase paper pulp matrix space, bleaching agent that later stage uses effectively is penetrated in paper pulp have an effect, respectively through oxygen delignification under strict reaction condition controls, hydrogen peroxide and mixing peroxy acid are bleached, increase the stability of pulp brightness, the lignin of paper pulp and hexenuronic acid content are reduced, save the operation and expense of returning drift, compound after the reaction not containing band rate in gained slurries, environmentally safe, related reagent is reusable.
Detailed description of the invention
Embodiment
A chlorine-free bleaching technique for paper pulp, comprises the following steps:
(1) in body paper slurry, add 'beta '-mannase and carry out just one-Step bleach;
(2), after rinsed with clear water, oxygen delignification bleaching is added;
(3) paper pulp through preliminary treatment is put into pressure reactor, in nitrogen environment, add hydrogen peroxide bleaching;
(4) mixing peroxy acid is utilized to bleach;
(5), after washing, copy paper operation is entered.
As further improvement of these options, described in step (1), the consumption of 'beta '-mannase is 2% of pulp weight, and pH value is 3.5-4.5, and temperature remains on 55-65 DEG C, and the time is 2-4 hour.
As further improvement of these options, in step (2), temperature is 100-110 DEG C, and flow of oxygen is the consumption of 2%, NaOH of pulp weight is 4 ‰, MgSO of pulp weight
4consumption be 0.3-0.6wt%, the time is 20-40 minute.
As further improvement of these options, in step (3), the concentration of hydrogen peroxide is 37.5%, and use amount is 2% of pulp weight, and air pressure is 280KPa, and reaction temperature is 130-150 DEG C, and pH value is 8-10, and the time is 1-2 hour.
As further improvement of these options, mixing peroxy acid described in step (4) is peroxosulphuric and Peracetic Acid, add that quality is respectively pulp weight 8 ‰ and 4 ‰, and pH value is 4-5, and temperature is 50-70 DEG C, and the time is 80-150 minute.
In bleaching process, the viscosity of paper pulp, whiteness are the direct performance of association with pulp bleaching result, the content of lignin in paper pulp and hexenuronic acid then can have influence on the last problem obtaining rice paper whether can be anti-yellow, therefore progressively detect these four kinds of indexs in the present embodiment with analysis result, detect data as shown in the table:
Table 1
Wherein the testing conditions of the content of hexenuronic acids is Kappa number when being 50, and effective alkali consumption is 18%, AQ consumption is 0.05%.
Can be drawn by data in table 1, after method bleaching in the present invention, viscosity is in normal range (NR), and can ensure the tensile strength of rice paper, whiteness is up to 85.2%, reach higher level, and the content of lignin in paper pulp and hexenuronic acids also drops to reduced levels after step (2), effectively can avoid the anti-yellow phenomenon of rice paper, not containing band chlorine compound in bleaching agent of the present invention, bleaching product environmentally safe, reuses after decomposable asymmetric choice net.
Claims (5)
1. a chlorine-free bleaching technique for paper pulp, is characterized in that, comprise the following steps:
(1) in body paper slurry, add 'beta '-mannase and carry out just one-Step bleach;
(2), after rinsed with clear water, oxygen delignification bleaching is added;
(3) paper pulp through preliminary treatment is put into pressure reactor, in nitrogen environment, add hydrogen peroxide bleaching;
(4) mixing peroxy acid is utilized to bleach;
(5), after washing, copy paper operation is entered.
2. the chlorine-free bleaching technique of a kind of paper pulp as claimed in claim 1, it is characterized in that, described in step (1), the consumption of 'beta '-mannase is 2% of pulp weight, and pH value is 3.5-4.5, and temperature remains on 55-65 DEG C, and the time is 2-4 hour.
3. the chlorine-free bleaching technique of a kind of paper pulp as claimed in claim 1, is characterized in that, in step (2), temperature is 100-110 DEG C, and flow of oxygen is the consumption of 2%, NaOH of pulp weight is 4 ‰, MgSO of pulp weight
4consumption be 0.3-0.6wt%, the time is 20-40 minute.
4. the chlorine-free bleaching technique of a kind of paper pulp as claimed in claim 1, is characterized in that, in step (3), the concentration of hydrogen peroxide is 37.5%, use amount is 2% of pulp weight, and air pressure is 280KPa, and reaction temperature is 130-150 DEG C, pH value is 8-10, and the time is 1-2 hour.
5. the chlorine-free bleaching technique of a kind of paper pulp as claimed in claim 1, it is characterized in that, mixing peroxy acid described in step (4) is peroxosulphuric and Peracetic Acid, add that quality is respectively pulp weight 8 ‰ and 4 ‰, pH value is 4-5, and temperature is 50-70 DEG C, and the time is 80-150 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510645503.9A CN105239436A (en) | 2015-10-09 | 2015-10-09 | Chlorine-free bleaching technology of paper pulp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510645503.9A CN105239436A (en) | 2015-10-09 | 2015-10-09 | Chlorine-free bleaching technology of paper pulp |
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|---|---|
| CN105239436A true CN105239436A (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510645503.9A Pending CN105239436A (en) | 2015-10-09 | 2015-10-09 | Chlorine-free bleaching technology of paper pulp |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999064619A2 (en) * | 1998-06-10 | 1999-12-16 | Novozymes A/S | Novel mannanases |
| 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 |
| CN102852019A (en) * | 2012-09-18 | 2013-01-02 | 四川理工学院 | Totally chlorine-free bleaching method of bamboo pulp for producing Daqian writing and painting paper |
| CN103998680A (en) * | 2011-10-27 | 2014-08-20 | 巴科曼实验室国际公司 | Method and composition for enzymatic treatment of fiber for papermaking, and paper products made therewith |
-
2015
- 2015-10-09 CN CN201510645503.9A patent/CN105239436A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999064619A2 (en) * | 1998-06-10 | 1999-12-16 | Novozymes A/S | Novel mannanases |
| 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 |
| CN103998680A (en) * | 2011-10-27 | 2014-08-20 | 巴科曼实验室国际公司 | Method and composition for enzymatic treatment of fiber for papermaking, and paper products made therewith |
| CN102852019A (en) * | 2012-09-18 | 2013-01-02 | 四川理工学院 | Totally chlorine-free bleaching method of bamboo pulp for producing Daqian writing and painting paper |
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Application publication date: 20160113 |