CN101016702B - Chemical mechanical pulping method for cotton haulm raw material - Google Patents
Chemical mechanical pulping method for cotton haulm raw material Download PDFInfo
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- CN101016702B CN101016702B CN2007100264885A CN200710026488A CN101016702B CN 101016702 B CN101016702 B CN 101016702B CN 2007100264885 A CN2007100264885 A CN 2007100264885A CN 200710026488 A CN200710026488 A CN 200710026488A CN 101016702 B CN101016702 B CN 101016702B
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Abstract
The invention discloses a chemical mechanical pulping method which uses cotton stalk as material, wherein the invention processes the first grinding after the first screw protrusion pre-immersion to replace present APMP technique which comprises two screw protrusion immersion followed with at least two sections of grinding, then holds the pulp after first grinding process for some time to processchemical reaction, at the same time, the invention uses novel additive to replace traditional metal ion chelating agent, Na2SiO3 and MgSO4. Compared with present APMP technique, the invention has lowcost and high strength to be used to produce high-level paper.
Description
Technical field
The present invention relates to pulp and paper making method, be specifically related to the chemical mechanical pulp-making method of cotton haulm raw material.
Background technology
Cotton is as the very important agricultural economy crop of China, and it is boundless to distribute.Through long-term continuous evolution and development, just progressively concentrate to the Huanghe valley, the Yangtze river basin and three big cotton growing areas, Xinjiang in China cotton field, becomes the cotton big country of second largest in the world product.Data shows that Cotton in China output in 2004 is 6,320,000 t, and cotton stalk is as the main residue of cotton, and its output is considerable, produces cotton stalk per year and can reach 2,528 ten thousand t (by 1: 4 weight).But for a long time, most of cotton stalk be used as fuel or even directly stack and rot, cause the serious wasting of resources and environmental pollution, therefore how rationally to utilize cotton stalk resource to become to plant the territory, cotton region and need one of problem of solution badly.
Cotton stalk has phloem fiber to be grown and the short characteristics of xylem fiber, and cotton stalk bark fibre is longer, can improve the tensile strength of paper, bursting strength and folding strength; Though the fiber of cotton stalk core is short, its fibre length is higher than the Eucalyptus fiber, near aspen fibers by using silicon, has certain advantage.The research of having carried out at present comprises the chemical method boiling and reaches change machine legal system slurry etc. that wherein the chemical pulping yield is low, can not adapt to present fibrous raw material shortage, makes full use of the requirement of resource; But existing chemical-mechanical pulping exists whiteness low, problems such as dirt count height.At present, comprehensively the bar slurry is mainly used in and produces high-strength corrugated paper, sack kraft paper and warm nursery paper etc., owing to there are problems such as the difficult raising of whiteness, dirt count height, is difficult to industrialization as the research of high-grade paper.
Summary of the invention
The objective of the invention is to problem, a kind of chemical mechanical pulp-making method of cotton haulm raw material is provided, prepare the high whiteness paper pulp of high yield at the prior art existence.
The present invention improves traditional pulping process according to the characteristics of cotton stalk, two sections screw extrusion pre-preg two sections or multistage defibrination again in traditional APMP technology, the present invention just carries out one section defibrination behind first section defibrination dipping, and then carry out second section screw extrusion dipping, carry out defibrination again, disappear then latent, the washing and the screening, enter pulp storage tank at last.This technology can play and discongest fiber with first section defibrination in advance, promotes the effect of second section chemical impregnation; In addition, by adding chemical assistant such as quickly penetrating agent, organic metal ion chelating agent and bleaching stibilizer, replace traditional sodium metasilicate, magnesium sulfate and EDTA or DTPA, make the reaction of medicine and cotton stalk composition fast, effect is obvious, compare with traditional APMP, under the situation that does not influence yield, bleaching effect is obvious.
The chemical mechanical pulp-making method of cotton haulm raw material of the present invention comprises the steps:
(1) cotton haulm raw material is pulverized with pulverizer, flushing is soaked 20～50min and is made the dissolving of hot water melt in 85～98 ℃ of hot water, wash out;
(2) press compression ratio 4～5: 1, step (1) is washed out the raw material that obtains carry out the extruding of I section with screw extruder;
(3) add NaOH, H
2O
2And chemical assistant quickly penetrating agent, organic metal ion chelating agent and bleaching stibilizer, under 70～90 ℃ of slurry concentration 16～25% weight and temperature, carry out I section pre-preg 25～60min;
(4) be that the fiberizer of 0.4～0.7mm carries out I section defibrination with the gap, slurry concentration is 16～25% weight, keeps reaction 10～25min behind the defibrination in the dense holding vessel of height;
(5) by compression ratio 4～5: 1 carries out II section screw extrusion and discongests adding NaOH, H
2O
2And chemical assistant quickly penetrating agent, organic metal ion chelating agent and bleaching stibilizer, under 60～80 ℃ of slurry concentration 20～35% weight and temperature, carry out II section pre-preg 20～55min;
(6) be that the fiberizer of 0.05～0.25mm carries out II section defibrination with the gap, slurry concentration is 20～35% weight, latent, the washing of disappearing then, screening, and last pulping places pulp storage tank.
Above-mentioned method, in step (3), the step (5), it is as follows that each amounts of components of adding accounts for the percentage by weight of over dry cotton haulm raw material:
NaOH 4.8～6.0％
H
2O
2 4.3～5.5％
Quickly penetrating agent 0.07～0.08%
Organic metal ion chelating agent 0.03～0.5%
Bleaching stibilizer 0.06～0.5%.
Above-mentioned method, described quickly penetrating agent are a kind of surfactants.
Described quickly penetrating agent is F-1, and the organic metal ion chelating agent is TX-20C, ethylenediamine tetra-acetic acid (EDTA), and bleaching stibilizer is 1#, Na
2SiO
3, MgSO
4, wherein F-1, TX-20C, 1# reach an outstanding meticulous Chinese workers Co., Ltd production and selling by Tianjin.
Principle of the present invention is as follows: the difficult bleaching of cotton stalk slurrying, and the dirt count height, this is that cotton stalk bark is difficult.Present technique squeezing extrusion by easy stages from the preliminary treatment to the technical process adds chemicals reaction and defibrination, has both kept high yield pulp, allows the substance decomposition that produces dirt count in pigment and the skin again as much as possible.First section defibrination advanceed to before second section extruding, be to utilize cotton stalk after roughly grinding with chemicals reaction back, neither injure fiber, simultaneously fiber separation is more effective than screw extruder, fully reacts thereby the chemicals of second section dipping reaction is entered between fiber easily.On the other hand, selected quickly penetrating agent and organic metal ion chelating agent and bleaching stibilizer in the present technique for use, chemicals more can immerse fiber fast, does not injure fiber, bleaching stibilizer is the invalid decomposition that can avoid hydrogen peroxide, improves whiteness under the situation of assurance yield.
This is invented compared with prior art, and the present invention has following advantage:
1, adopts the new technology on traditional APMP technical foundation, innovate and select for use suitable drug additive in cotton stalk, to use to obtain high yield, the cotton stalk pulp of higher whiteness;
2, two sections of carrying out again after with two sections extrusion impregnatings in traditional APMP technology of this technology or multistage defibrination carry out after changing into I section defibrination being advanceed to I section extrusion impregnating, help the immersion reaction of II section medicine.
3, this technical matters flow process is simple, and cost is lower than traditional handicraft, bleaches on an equal basis to become the pulp brightness height under the drug dosage.Be a kind of excellent technique technology that is fit to cotton stalk slurrying.
The specific embodiment
The present invention is further detailed explanation below in conjunction with drawings and Examples, but embodiments of the present invention are not limited thereto.
Embodiment 1
Cotton haulm raw material is pulverized with pulverizer, cold water flush is soaked 50min the dissolving of hot water melt is washed out in 85 ℃ of hot water, the raw material that obtains is that 4: 1 screw extruder carries out the extruding of I section by compression ratio, the exit adds NaOH4.5% (to the over dry raw material, as follows), H
2O
21.0% and chemical assistant F-10.03%, metal ion chelation agent EDTA 0.6% and bleaching stibilizer Na
2SiO
30.1%, MgSO
40.2%, carry out I section pre-preg 30min for 20% time in 85 ℃ of temperature, concentration, carry out I section defibrination with the gap for the 0.4m fiberizer, defibrination is keeping reaction 15min under 25% concentration and under 60 ℃ of conditions in the dense holding vessel of height, the screw extruder that carried out compression ratio and be 4: 1 carries out the extruding of II section, adds NaOH 1.5%, H
2O
24.5% and chemical assistant F-1 0.04%, metal ion chelation agent EDTA 0.4% and bleaching stibilizer Na
2SiO
30.1%, MgSO
40.2%, carry out II section chemical impregnation 35min under 75 ℃ of, the temperature dense 30% at slurry, carrying out grinding clearance again is 0.2mmII section defibrination, then is disappear latent, washing, screening, last pulping is put in the pulp storage tank.Yield 72%, whiteness 55ISO%, tensile index 39N.m/g, tear index, 5.21mN.m
2/ g, opacity 93%.
Embodiment 2
Cotton haulm raw material is pulverized with pulverizer, and cold water flush is soaked 25min the dissolving of hot water melt is washed out in 98 ℃ of hot water, and the raw material that obtains is that 4: 1 screw extruder carries out the extruding of I section by compression ratio, and the exit adds NaOH 4.0%, H
2O
21.0% and chemical assistant F-10.03%, organic metal ion chelating agent TX-20C 0.02% and bleaching stibilizer 1#0.03%, carry out I section pre-preg 45min for 25% time in 75 ℃ of temperature, concentration, carry out I section defibrination with the gap for the 0.6mm fiberizer, defibrination is keeping reaction 20min under 25% concentration and under 60 ℃ of conditions in the dense holding vessel of height, the screw extruder that carried out compression ratio and be 4: 1 carries out the extruding of II section, adds NaOH 0.8%, H
2O
25.0% and chemical assistant F-10.05%, organic metal ion chelating agent TX-20C 0.04% and bleaching stibilizer 1#0.03%, carry out II section chemical impregnation 30min under 68 ℃ of, the temperature dense 30% at slurry, carrying out grinding clearance again is 0.15mmII section defibrination, then be disappear latent, washing, screening, last pulping is put in the pulp storage tank.Yield 70%, whiteness 59ISO%, tensile index 37N.m/g, tear index, 5.32mN.m
2/ g, opacity 95%.
Embodiment 3
Cotton haulm raw material is pulverized with pulverizer, and cold water flush is soaked 50min the dissolving of hot water melt is washed out in 80 ℃ of hot water, and the raw material that obtains is that 5: 1 screw extruder carries out the extruding of I section by compression ratio, and the exit adds NaOH 4.5%, H
2O
20.8% and chemical assistant F-10.04%, organic metal ion chelating agent TX-20C 0.01% and bleaching stibilizer 1#0.03%, carry out I section pre-preg 40min for 18% time in 80 ℃ of temperature, concentration, carry out I section defibrination with the gap for the 0.55mm fiberizer, defibrination is keeping reaction 10min under 25% concentration and under 60 ℃ of conditions in the dense holding vessel of height, the screw extruder that carried out compression ratio and be 4: 1 carries out the extruding of II section, adds NaOH 4.0%, H
2O
23.5% and chemical assistant F-10.03%, organic metal ion chelating agent TX-20C 0.02% and bleaching stibilizer 1#0.03%, carry out II section chemical impregnation 50min under 65 ℃ of, the temperature dense 30% at slurry, carrying out grinding clearance again is 0.1mmII section defibrination, then be disappear latent, washing, screening, last pulping is put in the pulp storage tank.Yield 68%, whiteness 52ISO%, tensile index 41N.m/g, tear index, 5.12mN.m
2/ g, opacity 96%.
Claims (4)
1. the chemical mechanical pulp-making method of a cotton haulm raw material is characterized in that comprising the steps:
(1) cotton haulm raw material is pulverized with pulverizer, flushing is soaked 20～50min and is made the dissolving of hot water melt in 85～98 ℃ of hot water, wash out;
(2) press compression ratio 4～5: 1, step (1) is washed out the raw material that obtains carry out the extruding of I section with screw extruder;
(3) add NaOH, H
2O
2And chemical assistant quickly penetrating agent, organic metal ion chelating agent and bleaching stibilizer, under 70～90 ℃ of slurry concentration 16～25% (weight) and temperature, carry out I section pre-preg 25～60min;
(4) be that the fiberizer of 0.4～0.7mm carries out I section defibrination with the gap, slurry concentration is 16～25% (weight), keeps reaction 10～25min behind the defibrination in the dense holding vessel of height;
(5) by compression ratio 4～5: 1 carries out II section screw extrusion and discongests adding NaOH, H
2O
2And chemical assistant quickly penetrating agent, organic metal ion chelating agent and bleaching stibilizer, under 60～80 ℃ of slurry concentration 20～35% (weight) and temperature, carry out II section pre-preg 20～55min;
(6) be that the fiberizer of 0.05～0.25mm carries out II section defibrination with the gap, slurry concentration is 20～35%, latent, the washing of disappearing then, screening, and last pulping places pulp storage tank.
2. method according to claim 1 is characterized in that in step (3), the step (5), and it is as follows that each amounts of components of adding accounts for the percentage by weight of over dry cotton haulm raw material:
NaOH 4.8～6.0％
H
2O
2 4.3～5.5％
Quickly penetrating agent 0.07～0.08%
Organic metal ion chelating agent 0.03～0.5%
Bleaching stibilizer 0.06～0.5%.
3. method according to claim 1 and 2 is characterized in that described quickly penetrating agent is a kind of surfactant.
4. method according to claim 3 is characterized in that described quickly penetrating agent is F-1, and the organic metal ion chelating agent is TX-20C or ethylenediamine tetra-acetic acid, and bleaching stibilizer is 1#, Na
2SiO
3Or MgSO
4, wherein F-1, TX-20C, 1# reach an outstanding Fine Chemical Co., Ltd production and selling by Tianjin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100264885A CN101016702B (en) | 2007-01-24 | 2007-01-24 | Chemical mechanical pulping method for cotton haulm raw material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100264885A CN101016702B (en) | 2007-01-24 | 2007-01-24 | Chemical mechanical pulping method for cotton haulm raw material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101016702A CN101016702A (en) | 2007-08-15 |
| CN101016702B true CN101016702B (en) | 2010-04-14 |
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ID=38725913
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|---|---|---|---|
| CN2007100264885A Expired - Fee Related CN101016702B (en) | 2007-01-24 | 2007-01-24 | Chemical mechanical pulping method for cotton haulm raw material |
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| CN101435165B (en) * | 2008-12-16 | 2010-12-08 | 山东凯隆环保科技有限公司 | Two-step isolation type full non-chlorine full cotton stalk bleaching pulp cleaning production process |
| CN101660282B (en) * | 2009-09-07 | 2014-11-05 | 泰安思特福科贸有限公司 | Method for preparing all cotton stalk cellulose by adopting mechanical-active oxygen method |
| CN107119479B (en) * | 2014-11-18 | 2020-07-10 | 沙良宝 | Low-salt-dissolving clean paper pulp and preparation method thereof |
| CN104674584A (en) * | 2015-02-06 | 2015-06-03 | 新疆国力源环保科技有限公司 | Cotton stalk natural colour semichemical mechanical pulp process |
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| CN111455705B (en) * | 2020-05-25 | 2022-07-12 | 贺先佑 | Method for manufacturing corrugated paper pulp by using tobacco waste |
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