CN102226320A - Method for producing bleached dissolving pulp for viscose fibers through denaturation of uncolored unbleached dissolving pulp - Google Patents
Method for producing bleached dissolving pulp for viscose fibers through denaturation of uncolored unbleached dissolving pulp Download PDFInfo
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- CN102226320A CN102226320A CN2011101491740A CN201110149174A CN102226320A CN 102226320 A CN102226320 A CN 102226320A CN 2011101491740 A CN2011101491740 A CN 2011101491740A CN 201110149174 A CN201110149174 A CN 201110149174A CN 102226320 A CN102226320 A CN 102226320A
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- dissolving pulp
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Abstract
The invention relates to a method for producing dissolving pulp for viscose fibers, and specifically provides a method for producing bleached dissolving pulp for viscose through denaturation of uncolored unbleached dissolving pulp, belonging to the field of paper making. The method comprises the following steps: disintegrating uncolored unbleached dissolving pulp, washing the pulp, carrying out primary and secondary oxygen delignification, and washing with water again; carrying out primary ClO2 bleaching, alkali refining, oxygen bleaching and hydrogen peroxide bleaching, and carrying out secondary ClO2 bleaching and acid treatment to obtain a finished bleached dissolving pulp product; and directly using the finished bleached dissolving pulp product on a viscose production line, impregnating, and pressing, wherein the concentration is 3-6%, and the temperature is 30-60 DEG C. By adopting element-chlorine-free bleaching to use ClO2 instead of chlorine gas, the invention protects the environment, reduces the pollution and improves the whiteness and strength of the pulp. Besides, the sewage is easy to treat, and the energy is saved. The production of the bleached dissolving pulp can greatly ease the tight supply of the pulp.
Description
Technical field
The present invention relates to be used to produce the method for the dissolving pulp of viscose, specifically a kind of field of papermaking true qualities are not floated the dissolving pulp sex change and are produced the method for viscose glue with bleached dissolving pulp.
Background technology
The main raw material(s) pulp that viscose production needs mainly contains the cotton pulp dregs of rice, wood pulps, bamboo pulp.With regard to the output of present viscose, the cotton pulp dregs of rice can only satisfy 30% demand, and bamboo pulp is subjected to the fibre structure characteristics, and factor affecting such as the maturity of production technology can't be widely applied.The production of these pulps all needs digesting technoloy, production process complexity, production cost height.Especially bleaching process, traditional association with pulp bleaching generally be with chlorine as bleaching agent, in the bleaching process, have multiple chloridized organic compounds and produce, contaminated environment not only, and harmful.
Summary of the invention
The present invention provides a kind of and does not float the method for dissolving pulp sex change production viscose glue with bleached dissolving pulp with true qualities for addressing the deficiencies of the prior art.Adopt element chlorine free bleaching to produce the viscose glue bleached dissolving pulp, protect environment, technology simple, production cost is low.
Realize above-mentioned purpose, the present invention by the following technical solutions:
A kind of true qualities are not floated the dissolving pulp sex change and are produced the method for viscose with the bleached dissolving pulp dregs of rice, and the described bleached dissolving pulp dregs of rice are that the employing the key technical indexes is the first fibre
The true qualities of weight percentage＞87%, kappa value 8-12ml, viscosity 25-40mps, whiteness＞30%, degree of polymerization 850-1200dp are not floated dissolving pulp production, and its production method comprises the steps:
⑴, true qualities are not floated dissolving pulp size degradation, pulp washing;
⑵, the oxygen section of taking off: do not float dissolving pulp through the true qualities of size degradation, washing and carry out the I and II oxygen delignification, wash with water once more;
⑶, bleaching: one-level Cl0
2Bleaching is floated, behind the hydrogen peroxide bleaching, is carried out secondary Cl0 through alkali refining, oxygen
2Obtain the finished product bleached dissolving pulp dregs of rice after bleaching, the acid treatment;
⑷, finished product bleached dissolving pulp congee is directly used in the viscose glue production line, floods, squeezing process, its concentration is 3-6%, temperature 30-60 ℃.
Adopt technique scheme, compared with prior art, do not produce the viscose glue bleached dissolving pulp with floating dissolving pulp, the fine content height of its first, low, the many army sugar of content of lignin content is low.Slurry fine integrated without boiling, copy slurry and oven dry, the simple cost of production process is low.The present invention adopts advanced element chlorine free bleaching, uses Cl0
2Replace chlorine, not only protect environment, reduce and pollute, improve whiteness, the intensity of slurry.And sewage is handled the saving energy easily.Bleached dissolving pulp produces, and will greatly alleviate pulp situation in short supply.
The specific embodiment
The present invention is that a kind of true qualities are not floated the dissolving pulp sex change and produced the method for viscose glue with bleached dissolving pulp, and this bleached dissolving pulp is that to adopt the key technical indexes be that the true qualities of the fine weight percentage of first＞87%, card handkerchief (kappa) value 8-12ml, viscosity 25-40mps, whiteness＞30%, degree of polymerization 850-1200dp are not floated dissolving pulp production.Production method comprises following key step: true qualities do not float that size degradation, pulp washing, the secondary oxygen delignification of dissolving pulp, 1 grade of ClO 2 bleaching, alkali refining, oxygen float, hydrogen peroxide floats, 2 grades of Clo
2Bleaching, acid treatment.Finished product bleached dissolving pulp congee is directly used in the viscose glue production line, floods, squeezing process, and its concentration is 3-6%, temperature 30-60 ℃.
Main technologic parameters:
The oxygen section of taking off: concentration 10-12%, 105 ℃ of temperature, time 60-80 minute, pH value 12.5.
One-level Cl0
2Bleaching: concentration 10-12%, temperature-70 ℃, time 80-120 minute, pH value 1.5-2.0.
Alkali refining, oxygen float, H
2O
2Section: concentration 10%-12%, temperature 40-70 ℃, time 25-95 minute, pH value 10-12.
Secondary Cl0
2Bleaching section: concentration 10-12%, temperature 75-80 ℃, time 25-95 minute, pH value 3.5-4.0.
Acid treatment section: concentration 3-6%, temperature normal temperature, time 30-60 minute.
The viscose glue that the present invention the produces the key technical indexes of bleached dissolving pulp: dynamic viscosity mpa s 10-25, degree of polymerization 450-850, first fibre 〉=90%, ash≤0.15, irony 20≤ppm, whiteness 〉=85, little dust≤60mm
2/ kg, reactivity worth 〉=40ml, ambient influnence are less than the production of the cotton pulp dregs of rice.
Specific embodiment
Embodiment 1:
1, select for use true qualities not float dissolving pulp 10000kg.
Its index is: the fine 94.3%(weight percent content of first), and ash content 0.69%, irony 84ppm, viscosity 23.92mpa.s, whiteness 31%, degree of polymerization 864dp, reactivity worth 10ml, little dust 209mm
2/ kg, lignin 1.6%(weight percent content), pentosan 9.8%(weight percent content).
2, with percentage by weight be 10% concentration hydrolysis.
3, through hydrabrusher size degradation, pulp washing.
4, with in dense pump will not float dissolving pulp through the true qualities of size degradation and get in the I level oxygen delignification tower and carry out oxygen delignification, concentration 12%, 105 ℃ of temperature, 70 minutes time, pH value 12.5, get to again in the II level oxygen delignification tower and carry out oxygen delignification, concentration 10%, 105 ℃ of temperature, 80 minutes time, pH value 12.5.
The slurry congee that 5, will obtain is got to bleachery with stock pump and is carried out one-level Clo
2Bleaching:
Concentration 12%, 70 ℃ of temperature, 120 minutes time, pH value 2.0;
6, alkali refining, oxygen float, H
2O
2Section: concentration 12%, 65 ℃ of temperature, 80 minutes time, pH value 11;
7, secondary Clo
2Bleaching: concentration 11%, 80 ℃ of temperature, 95 minutes time, pH value 4.0;
8, acid treatment section: concentration 4.5%, temperature normal temperature, 45 minutes time.
The viscose glue that obtains with the bleached dissolving pulp index is: dynamic viscosity: 19.6mpa.s, degree of polymerization 586dp, first fibre 93.5%, ash content 0.11%, irony 15ppm, whiteness 89%, little dust 21mm
2/ kg, the full mistake of reactivity worth, moisture≤9.88%.
The finished product bleached dissolving pulp is directly used in the viscose glue production line, floods, squeezing process, its concentration is 5%, 60 ℃ of temperature.
Embodiment 2:
1, select for use true qualities not float dissolving pulp 100000kg.
Index is: first fibre 87.9%, and ash content 0.79%, irony 40ppm, viscosity 28.12 mpa.s, whiteness 52%, degree of polymerization 1053dp, reactivity worth does not have, little dust 215 mm
2/ kg, lignin 5.8%, pentosan 6.67%
2, with percentage by weight be 12% concentration hydrolysis.
3, through the hydrabrusher size degradation.
4, the oxygen section of taking off: with in dense pump get in 1 grade of oxygen delignification tower and carry out oxygen delignification, 105 ℃ of temperature, 80 minutes time, pH value 12.5 are got in the II level oxygen delignification tower again and are carried out oxygen delignification, 100 ℃ of temperature, 75 minutes time, pH value 12.5.
The slurry congee that 5, will obtain is got to bleachery with stock pump and is bleached, and is followed successively by: 1 grade of Clo
2Bleaching: concentration 10-12%
65 ℃ of temperature, 120 minutes time, pH value 2.0; Alkali refining, oxygen float, H
2O
2Section: concentration 10%-12%, 70 ℃ of temperature, 90 minutes time, pH value 11; 2 grades of Clo
2Bleaching section: concentration 10-12%, 80 ℃ of temperature, 90 minutes time, pH value 4.0; Acid treatment section: concentration 4.5%, temperature normal temperature, 40 minutes time.
6, through above-mentioned technological operation, the viscose glue that obtains with the bleached dissolving pulp index is: dynamic viscosity: 15mpa.s, degree of polymerization 663dp, first fibre 91.9%, ash content 0.12, irony 12, whiteness 88%, little dust 32mm
2/ kg, reactivity worth 40ml, moisture≤10.4%.
The finished product bleached dissolving pulp is directly used in the viscose glue production line, floods, squeezing process, its concentration is 3-6%, temperature 30-60 ℃.
More than disclosed only be specific embodiments of the invention; though the present invention discloses as above with preferred embodiment; but the present invention is not limited thereto; any those skilled in the art can think variation; in not breaking away from design philosophy of the present invention and scope; the present invention is carried out various changes and retouching, all should drop within protection scope of the present invention.
Claims (7)
1. true qualities are not floated the method for dissolving pulp sex change production viscose with the bleached dissolving pulp dregs of rice, the described bleached dissolving pulp dregs of rice are that to adopt the key technical indexes be that the true qualities of the fine weight percentage of first＞87%, kappa value 8-12ml, viscosity 25-40mps, whiteness＞30%, degree of polymerization 850-1200dp are not floated dissolving pulp and produced, and it is characterized in that: its production method comprises the steps:
⑴, true qualities are not floated dissolving pulp size degradation, pulp washing;
⑵, the oxygen section of taking off: do not float dissolving pulp through the true qualities of size degradation, washing and carry out the I and II oxygen delignification, wash with water once more;
⑶, bleaching: one-level Cl02 bleaching is floated, behind the hydrogen peroxide bleaching, is carried out obtaining the finished product bleached dissolving pulp dregs of rice after secondary Cl02 bleaching, the acid treatment through alkali refining, oxygen;
⑷, finished product bleached dissolving pulp congee is directly used in the viscose glue production line, floods, squeezing process, its concentration is 3-6%, temperature 30-60 ℃.
2. true qualities according to claim 1 are not floated the dissolving pulp sex change and are produced the method for viscose with bleached dissolving pulp, it is characterized in that the oxygen section of taking off I and II oxygen delignification
Technological parameter be respectively: concentration 10-12%, 105 ℃ of temperature, time 60-80 minute; PH value 12.5.
3. true qualities according to claim 1 are not floated the dissolving pulp sex change and are produced the method for viscose with bleached dissolving pulp, it is characterized in that the technological parameter of described one-level Cl02 bleaching is: concentration 10-12%, temperature-70 ℃, time 80-120 minute, pH value 1.5-2.0.
4. true qualities according to claim 1 are not floated the dissolving pulp sex change and are produced the method for viscose with bleached dissolving pulp, it is characterized in that described alkali refining, oxygen float, the technological parameter of H2O2 section is respectively: concentration 10%-12%, temperature 40-70 ℃, time 25-95 minute, pH value 10-12.
5. true qualities according to claim 1 are not floated the dissolving pulp sex change and are produced the method for viscose with bleached dissolving pulp, it is characterized in that the technological parameter of described secondary ClO2 bleaching section is: concentration 10-12%, temperature 75-80 ℃, time 25-95 minute, pH value 3.5-4.0.
6. true qualities according to claim 1 are not floated the dissolving pulp sex change and are produced the method for viscose with bleached dissolving pulp, it is characterized in that the technological parameter of described acid treatment section is: concentration 3-6%, temperature normal temperature, time 30-60 minute.
7. do not float the dissolving pulp sex change according to claims 1 described a kind of true qualities and produce the method for viscose with bleached dissolving pulp, it is characterized in that: the technical indicator dynamic viscosity of described finished product bleached dissolving pulp: 10-25mpa.s, degree of polymerization 450-850dp, first fibre 〉=91%, ash content 0.11%-0.15%, irony 12-20ppm, whiteness 〉=85%, little dust 21mm2-32mm2/kg, reactivity worth 〉=40ml, moisture 9.88%-11%.
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|---|---|---|---|
| CN2011101491740A CN102226320A (en) | 2011-06-03 | 2011-06-03 | Method for producing bleached dissolving pulp for viscose fibers through denaturation of uncolored unbleached dissolving pulp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572631A (en) * | 2013-11-11 | 2014-02-12 | 新疆富丽达纤维有限公司 | Preparation method of pulp for regenerating papermaking pulp into viscose staple fiber |
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| CN101235607A (en) * | 2008-03-05 | 2008-08-06 | 四川省高县华盛纸业有限公司 | Method for producing natural antibacterial bamboo fiber |
| CN101446053A (en) * | 2008-12-24 | 2009-06-03 | 宜宾长毅浆粕有限责任公司 | Whiten method for preparing bamboo chemical dissolving pulp and application thereof |
| CN101457494A (en) * | 2008-12-24 | 2009-06-17 | 宜宾长毅浆粕有限责任公司 | Production method of bamboo chemical dissolving pulp |
| CN101580970A (en) * | 2009-06-09 | 2009-11-18 | 山东海龙股份有限公司 | Preparation method for hemp pulp and prepared hemp pulp |
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2011
- 2011-06-03 CN CN2011101491740A patent/CN102226320A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101235607A (en) * | 2008-03-05 | 2008-08-06 | 四川省高县华盛纸业有限公司 | Method for producing natural antibacterial bamboo fiber |
| CN101446053A (en) * | 2008-12-24 | 2009-06-03 | 宜宾长毅浆粕有限责任公司 | Whiten method for preparing bamboo chemical dissolving pulp and application thereof |
| CN101457494A (en) * | 2008-12-24 | 2009-06-17 | 宜宾长毅浆粕有限责任公司 | Production method of bamboo chemical dissolving pulp |
| CN101580970A (en) * | 2009-06-09 | 2009-11-18 | 山东海龙股份有限公司 | Preparation method for hemp pulp and prepared hemp pulp |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572631A (en) * | 2013-11-11 | 2014-02-12 | 新疆富丽达纤维有限公司 | Preparation method of pulp for regenerating papermaking pulp into viscose staple fiber |
| CN103572631B (en) * | 2013-11-11 | 2015-04-22 | 新疆富丽达纤维有限公司 | Preparation method of pulp for regenerating papermaking pulp into viscose staple fiber |
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Application publication date: 20111026 |