CN103184700A - Preparation method for dissolving pulp used for viscose fiber through modification of chemical pulp - Google Patents
Preparation method for dissolving pulp used for viscose fiber through modification of chemical pulp Download PDFInfo
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- CN103184700A CN103184700A CN2011104476085A CN201110447608A CN103184700A CN 103184700 A CN103184700 A CN 103184700A CN 2011104476085 A CN2011104476085 A CN 2011104476085A CN 201110447608 A CN201110447608 A CN 201110447608A CN 103184700 A CN103184700 A CN 103184700A
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Abstract
The invention relates to the field of chemical fibers, in particular to a preparation method for dissolving pulp used for a viscose fiber through modification of chemical pulp. The method comprises the following steps: fully dispersing a chemical pulp board and regulating the pH value of obtained slurry after dispersing to allow the pH value of the slurry to be neutral; and then adding an enzyme preparation, carrying out a reaction at a temperature of 45 to 55 DEG C for 1 to 4 h and subjecting the reacted slurry to alkali cooking or to extrusion in the presence of an alkali so as to obtain the dissolving pulp for the viscose fiber, wherein the enzyme preparation is one or more selected from the group consisting of endoglucanase, xylanase and laccase. The method provided by the invention has a simple process and needs low investment; and the prepared dissolving pulp has high alpha cellulose content and good fiber reaction performance.
Description
Technical field
The present invention relates to belong to the chemical fibre field, a kind of chemical pulp modification specifically prepares the method that viscose is used dissolving pulp.
Background technology
China is maximum in the world fabric clothing producing country, and is strong to city's field dependence of chemical fibre raw material, and deficient day by day along with petroleum resources, can replace the market demand of natural biomass fiber of synthetic fiber increasing.And be that the living beings protofibre of representative reduces because of the cotton feed amount with the cotton fiber, the market price is soaring year by year, so with the living beings regenerated fiber that plant fiber materials such as timber, bamboo, fiber crops are produced, just usually said refined stock or dissolving pulp have more and more caused people's attention.
Dissolving pulp major part on the China market is that raw material passes through sulfite method, prehydrolytic sulfate process or soda process production (CN1247250A, CN101368295A, CN101565906A etc.) with bamboo, wood chip now.Though these method pulp qualities are good, process is loaded down with trivial details, and equipment investment is big.And the general alpha-cellulose content about 80% of the chemical pulpboard on the China market, whiteness is more than 85%ISO, and resin content is less than 0.15%, and homemade pulpboard can be higher slightly, but the performance indications of basic and dissolving pulp approach.These conventional chemical pulps are lignin and hemicellulose level higher (generally between 2%～8%) as the subject matter of dissolving pulp, fiber viscosity (600～1000mL/g bigger than normal, according to the different and difference slightly of raw material), thus the reactivity of fiber influenced.If by chemistry or biological method these pulps are carried out subsequent treatment, improve content of cellulose and reactivity, will increase its added value widely, reduce dissolving pulp to the dependence of cotton fiber.
Now domesticly utilize the modification of papermaking level wood pulp to prepare dissolving pulp, its main method is to use the NaOH of higher concentration or adds certain auxiliary agent and makes hemicellulose stripping in the bleached wood pulp, handles through squeezing again, squeezes out unnecessary alkali lye.And then the slurry after will purifying carries out manufacturing paper with pulp into pulp after suitable viscosity reduction, washing, the removal of impurities, and this method is referred to as alkali refining method (CN101736632A).Beijing Forestry University (CN101235547A) has proposed a kind ofly non-prehydrolysis sulfate bamboo pulp is carried out pickling handle to reduce the method that xylan content is produced dissolving pulp with bacterial xylanase again.But these methods are not mentioned the influence to the very important performance indications fiber-reactive performance of dissolving pulp.
Summary of the invention
The object of the invention is, provides a kind of chemical pulp modification to prepare the method that viscose is used dissolving pulp.For achieving the above object, the technical solution used in the present invention is:
A kind of chemical pulp modification prepares the method that viscose is used dissolving pulp, chemical pulpboard is fully disperseed, disperse the back to regulate the pH value of slurry, make the slurry pH value be, then add enzyme preparation, at 45-55 ℃ of following reaction 1-4h, after the reaction slurries are carried out alkaline boiling or in the presence of alkali extrusion process, can obtain the viscose dissolving pulp; The slurries that obtain are carried out drying, are shaped and handle, namely obtain meeting the dissolving pulp of viscose requirement.The pH value that adopts inorganic acid and/or organic acid to regulate slurry is 5-8.Described inorganic acid is sulfuric acid, hydrochloric acid or phosphoric acid; Organic acid is formic acid or acetic acid.
Described enzyme preparation is one or more in endoglucanase, zytase, the laccase; Wherein endoglucanase, zytase or laccase addition are respectively in the substrate oven dry stock, and the consumption of endoglucanase is the 20-300U/g substrate, and the consumption of zytase is the 20-200U/g substrate, and the consumption of laccase is the 50-500U/g substrate.
To add oven dry stock in the slurries after the described reaction, the alkali of mass percent 5-12% is used alkaline boiling 0.5-2h down at 95-120 ℃;
Or the aqueous slkali of relative oven dry stock mass percent 4-12% or the hydrogen peroxide of relative oven dry stock mass percent 3-8% will be added after the reaction in the slurries, adopt the double-screw extrusion machine extrusion process down at 95-105 ℃, obtain the slurries that the exit concentration mass percent is 30-40%.
The alkali that after the described reaction slurries is carried out the alkaline boiling employing is NaOH or potassium hydroxide, and consumption is to oven dry stock mass percent 5-12%, and temperature is 95-120 ℃, and the time is 0.5-2h.
The concentration that adopts during described the extruding is that the alkali of 6-50% (mass percent) is NaOH or potassium hydroxide; Concentration of hydrogen peroxide (mass percent) is 6-30%, and pulp density (mass percent) 30-40% of control double-screw extrusion machine outlet, and treatment temperature is 95-105 ℃.
Described chemical pulpboard is commercially available bleached chemical pulpboard, and namely bleached sulphate softwood pulp, BRATSK, alkaline process bamboo pulp maybe need to improve one or more mixing of the dissolving pulp of fiber-reactive performance.If pending slurry viscosity meets viscose with the requirement (being generally less than 500ml/g) of dissolving pulp, only for can directly adding enzyme preparation, the reactivity worth (as through chemically treated common dissolving pulp) of improving fiber can realize obtaining satisfactory viscose dissolving pulp.
Relative prior art, the present invention has following advantage and beneficial effect: the present invention is raw material with commercially available chemical pulp, the method that adopts biology enzyme to combine with chemical method is handled, invest little, convenient, flexible, can produce the dissolving pulp that meets the viscose requirement fast, chemical cellulose content height in the slurries, the fiber-reactive performance is good, and can improve the performance indications of pulp.
The specific embodiment
Embodiment 1
Be raw material [chemical cellulose content 83.4%, content of lignin 1.2%, cellulose reactive 33.4%, viscosity 911.3ml/g with bleaching needlebush chemistry pulpboard.Wherein the fiber-reactive performance detects (Enzyme and Microbial Technology 47 (2010) 355 362) by the Fock method, other performance indications all detect by Chinese Industrial Standards (CIS)], join in the hydrabrusher, control slurry concentration 10% (mass percent), fully loosen collagen fibre.Be that 0.5% sulfuric acid is regulated pH value to 5 with mass percent concentration, add endoglucanase 100U/g oven dry stock, under 50 ℃ of conditions, react 2h.Reacted slurry is at 10% mass percent concentration, and sodium hydroxide concentration is 9%, 105 ℃ to oven dry stock, and 1h is handled in boiling., alpha fibers content 92.1% in the gained pulp, content of lignin 0.2%, fibrin reaction performance 69.3%, viscosity 467ml/g.
Embodiment 2
Be raw material (chemical cellulose content 80.2%, content of lignin 1.3%, cellulose reactive 35.2%, viscosity 814.5ml/g) with bleaching leaf wood chemistry pulpboard, join in the hydrabrusher control slurry concentration 3%, fully loosen collagen fibre.Be that 1% sulfuric acid is regulated pH value 5 with mass percent concentration, add endoglucanase 100U/g oven dry stock, zytase 100U/g oven dry stock reacts 2h under 50 ℃ of conditions.Adding mass percent concentration in the reacted slurry is that 10% sodium hydroxide solution mixing places double-screw extrusion machine, adopts the double-screw extrusion machine extrusion process down at 97 ℃, obtains the slurries that exit concentration is 35% (mass percent).Be placed on after the processing and react 2h in the attemperator.Record the alpha fibers content 91.5% of pulp, content of lignin 0.3%, fibrin reaction performance 70.3%, viscosity 456ml/g.
Embodiment 3
Starching with the bleaching bamboo dissolving is raw material (chemical cellulose content 88.2%, content of lignin 0.3%, cellulose reactive 68.8%, viscosity 499.7ml/g), joins in the hydrabrusher control concentration 8%, fully loosen collagen fibre.Regulate pH value 5 with sulfuric acid, add endoglucanase 200U/g oven dry stock, and control 50 ℃ of temperature, reaction 2h.The alpha fibers content 90.2% of pulp, content of lignin 0.3%, fibrin reaction performance 78.2%, viscosity 487.2ml/g.
Claims (7)
1. a chemical pulp modification prepares the method that viscose is used dissolving pulp, it is characterized in that: chemical pulpboard is fully disperseed, disperse the back to regulate the pH value of slurry, make the slurry pH value for neutral, then add enzyme preparation, at 45-55 ℃ of following reaction 1-4h, after the reaction slurries are carried out alkaline boiling or in the presence of alkali extrusion process, can obtain the viscose dissolving pulp; Described enzyme preparation is one or more in endoglucanase, zytase, the laccase.
2. prepare the method that viscose is used dissolving pulp by the described chemical pulp modification of claim 1, it is characterized in that: the pH value that adopts inorganic acid and/or organic acid to regulate slurry is 5-8.
3. prepare the method that viscose is used dissolving pulp by the described chemical pulp modification of claim 2, it is characterized in that: described inorganic acid is sulfuric acid, hydrochloric acid or phosphoric acid; Organic acid is formic acid or acetic acid.
4. prepare the method that viscose is used dissolving pulp by the described chemical pulp modification of claim 1, it is characterized in that: described enzyme preparation is one or more in endoglucanase, zytase, the laccase; Wherein endoglucanase, zytase or laccase addition are respectively in the substrate oven dry stock, and the consumption of endoglucanase is the 20-300U/g substrate, and the consumption of zytase is the 20-200U/g substrate, and the consumption of laccase is the 50-500U/g substrate.
5. prepare the method that viscose is used dissolving pulp by the described chemical pulp modification of claim 1, it is characterized in that: will add oven dry stock in the slurries after the described reaction, the alkali of mass percent 5-12% is used alkaline boiling 0.5-2h down at 95-120 ℃;
Or the aqueous slkali of relative oven dry stock mass percent 4-12% or the hydrogen peroxide of relative oven dry stock mass percent 3-8% will be added after the reaction in the slurries, adopt the double-screw extrusion machine extrusion process down at 95-105 ℃, obtain the slurries that the exit concentration mass percent is 30-40%.
6. prepare the method that viscose is used dissolving pulp by claim 1 or 5 described chemical pulp modifications, it is characterized in that: the alkali that after the described reaction slurries is carried out the alkaline boiling employing is NaOH or potassium hydroxide, consumption is to oven dry stock mass percent 5-12%, temperature is 95-120 ℃, and the time is 0.5-2h.
7. prepare the method that viscose is used dissolving pulp by claim 1 or 5 described chemical pulp modifications, it is characterized in that: the concentration that adopts during described the extruding is that the alkali of 6-50% is NaOH or potassium hydroxide; Concentration of hydrogen peroxide is 6-30%, and the pulp density 30-40% of control double-screw extrusion machine outlet, and treatment temperature is 95-105 ℃.
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| CN201110447608.5A CN103184700B (en) | 2011-12-28 | 2011-12-28 | A kind of method of chemical pulp modification Making viscose fiber dissolving pulp |
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| CN103184700B CN103184700B (en) | 2016-01-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526623A (en) * | 2013-10-31 | 2014-01-22 | 昆明理工大学 | Method for improving soda-oxygen pulping process effect through xylanase pretreatment |
| CN103556517A (en) * | 2013-10-31 | 2014-02-05 | 昆明理工大学 | Method for improving oxygen-alkali pulping effect through laccase pretreatment |
| CN104631178A (en) * | 2015-02-09 | 2015-05-20 | 绍兴文理学院 | Deep purification method of crude cellulose |
| CN112431055A (en) * | 2020-11-16 | 2021-03-02 | 陕西科技大学 | Novel process for preparing dissolving pulp from chemical pulp for papermaking |
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| JPS5299303A (en) * | 1976-02-17 | 1977-08-20 | Jujo Paper Co Ltd | Process for refining dissolved pulp |
| WO1999016960A1 (en) * | 1997-10-01 | 1999-04-08 | Weyerhaeuser Company | Cellulose treatment and the resulting product |
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| CN101235547A (en) * | 2008-03-06 | 2008-08-06 | 北京林业大学 | Method for producing bamboo dissolving pulp |
| CN101736637A (en) * | 2009-12-17 | 2010-06-16 | 宜宾长毅浆粕有限责任公司 | Production method for preparing bamboo dissolving pulp by utilizing natural-color unbleached bamboo pulp in a modifying way |
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Patent Citations (5)
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| JPS5299303A (en) * | 1976-02-17 | 1977-08-20 | Jujo Paper Co Ltd | Process for refining dissolved pulp |
| WO1999016960A1 (en) * | 1997-10-01 | 1999-04-08 | Weyerhaeuser Company | Cellulose treatment and the resulting product |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526623A (en) * | 2013-10-31 | 2014-01-22 | 昆明理工大学 | Method for improving soda-oxygen pulping process effect through xylanase pretreatment |
| CN103556517A (en) * | 2013-10-31 | 2014-02-05 | 昆明理工大学 | Method for improving oxygen-alkali pulping effect through laccase pretreatment |
| CN103526623B (en) * | 2013-10-31 | 2016-02-24 | 昆明理工大学 | A kind of xylanase pretr eatment improves the method for soda-oxygen pulping effect |
| CN103556517B (en) * | 2013-10-31 | 2016-11-23 | 昆明理工大学 | A kind of laccase pretreatment improves the method for oxygen alkali pulping effect |
| CN104631178A (en) * | 2015-02-09 | 2015-05-20 | 绍兴文理学院 | Deep purification method of crude cellulose |
| CN104631178B (en) * | 2015-02-09 | 2016-08-24 | 绍兴文理学院 | A kind of deep purification method of raw cellulose |
| CN112431055A (en) * | 2020-11-16 | 2021-03-02 | 陕西科技大学 | Novel process for preparing dissolving pulp from chemical pulp for papermaking |
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| CN103184700B (en) | 2016-01-13 |
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