CN103952937A - Modified papermaking grade wood pulp production technology - Google Patents
Modified papermaking grade wood pulp production technology Download PDFInfo
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- CN103952937A CN103952937A CN201410123819.7A CN201410123819A CN103952937A CN 103952937 A CN103952937 A CN 103952937A CN 201410123819 A CN201410123819 A CN 201410123819A CN 103952937 A CN103952937 A CN 103952937A
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- chlorination
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- bleaching
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Abstract
The invention discloses a modified papermaking grade wood pulp production technology. The technology comprises the steps of material preparation, boiling, chlorination, bleaching and acid treatment. A waterpower pulper is utilized to fully untwine and disperse a slurry in order to make wood fibers uniformly dipped in an alkaline solution and greatly improve the boiling uniformity; the above boiling process reduces the content of non-cellulose impurities and reduces the cotton fiber polymerization degree; the above chlorination process can remove parts of colored impurities, and correspondingly improves the methylcellulose content; the above bleaching process can improve the cellulose whiteness, maintain continuous polymerization reduction and remove impurities; and the above acid treatment process can remove ash and iron, and improves the reaction performance. A modified papermaking grade wood pulp produced by adopting the technology can reach dissolved wood pulp index requirements, and accords with viscose fiber production requirements.
Description
Technical field
The present invention relates to modified papermaking grade wood pulp and production technology, specifically a kind of production technology of the modified papermaking grade wood pulp that is applicable to viscose.
Background technology
Along with the development of China's viscose industry, domestic enterprise is the raw materials for production as viscose mainly with Cotton Pulp, but are subject to the restriction of cultivated area and growth cycle, and this raw material is shortage day by day, has had a strong impact on the development of China's viscose industry.There is only a few enterprise to attempt the raw materials for production using bamboo pulp as viscose for this reason, and obtain initial success, if the patent No. is CN02112175.3, name is called the patent of invention of " bamboo pulp denatured productive technology ", a kind of production technology of bamboo pulp is disclosed, but bamboo fibre average length is lower than papermaking xylon, again because its ash is many, pentose content is high, and bamboo fibrid matter is hard, heavy wall, lumen is narrow, fibr tissue is fine and close, have the problems such as air in cell and cause producing difficulty, need raw material many, cost is high, thereby also fails to be widely applied.For reducing production costs, steady production operation, research and development meet viscose production requirement dissolving pulp substitute products oneself become the task of top priority.
Summary of the invention
The present invention's object, is to overcome the above-mentioned deficiency of prior art, and a kind of production technology of modified papermaking grade wood pulp is provided, and this technique is simple, easy to operate, and the modified papermaking grade wood pulp of production meets the production requirement of viscose, and running cost is low.
The technical scheme that the present invention solves described problem employing is: a kind of production technology of the modified papermaking grade wood pulp utmost point, comprises following rapid:
1. get the raw materials ready
Papermaking grade wood pulp plate is piled up to after on conveyer, on request by Belt Conveying feeding hydrabrusher, through the dispersion of discongesting of alkali spray and agitator, sent into squeezer and carry out, after extrusion dehydration, sending into rotary spherical digester.
This operation realizes the preparation of appraising and deciding inlet amount, alkali charge and the Different Weight raw material proportioning of every batch of material according to technological requirement.
2. boiling
The slurry having flooded enters rotary spherical digester and carries out boiling, adds caustic soda, ensures that amount of caustic soda accounts for over dry slurry 13-20%, bath raio 1: 2-4, heating-up time 60-100 minute, temperature retention time 80-150 minute, holding temperature 160-180 DEG C.
Wherein, over dry slurry refers to moisture free fibre stuff; Bath raio refers to the ratio of the over dry raw material weight that packs in boiling vessel and the total liquid measure of boiling.
3. chlorination
Boiling disposed slurry is carried out to chlorination, add hydrochloric acid, liquid chlorine, caustic soda, ensure that chlorination is front containing containing alkali 10-60g/m after chloride≤0.05-0.25g/L, chlorination after sour 0.12-0.18g/L, chlorination
3.
4. bleaching
Slurry after chlorination is sent into Bellmer and bleach, slurry is concentrated and ensures after slurry, to starch dense 4.5%; Add bleaching liquor, bleaching time 30-90 minute, temperature 35-50 DEG C.
5. acid treatment
Add hydrochloric acid, 40 minutes acid treatment time, enter and float pond through spray, containing acid>=0.5-1.5g/L, manufacture paper with pulp, be packaged as fixed heavy 400-900g/m through paper machine
2the wood pulps of (every square meter wood pulps weight is 400-900 gram).
The present invention takes technique scheme, has following beneficial effect: the present invention, by utilizing hydrabrusher fully to discongest dispersion to slurry, makes xylon and alkali lye dipping more even, increases substantially cooking homogeneities.By cooking process, can reduce non-cellulosic impurity content, give cotton fiber with good swelling expansive force, reduce the cotton fiber degree of polymerization.By chloride process, can remove part foreign pigment, establish bleaching basis, the fine content of corresponding raising first.By bleaching process, can improve cellulose whiteness, and maintenance fall poly-, the impurity such as removal waxy substance, nitrogen substance in various degree.By acid treatment, can reach except ash, irony, improve the object of reactivity worth.Its main quality index: dynamic viscosity 7-12mpa.s; Alpha cellulose >=90%; Ash≤0.10%; Irony≤15ppm; Whiteness >=85%; Moisture content≤12%; Reactivity worth≤250s; Degree of polymerization 400-600.Reach the index request of dissolving pulp, met the production requirement of viscose.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in detail.
Embodiment 1
1. get the raw materials ready
Papermaking grade wood pulp plate is piled up to the alkali that is 41g/L by Belt Conveying feeding hydrabrusher through concentration on request after on conveyer and sprayed, send into squeezer and carry out entering rotary spherical digester after extrusion dehydration.
2. boiling
Adopt rotary spherical digester alkaline cooking, the slurry having flooded is sent into rotary spherical digester and carry out boiling, keep amount of caustic soda to account for over dry slurry 13%, bath raio 1: 3.44,80 minutes heating-up times, temperature retention time 80 minutes, 160 DEG C of holding temperatures, large steam bleeding, 50 minutes time, pressure 0Mpa.
3. chlorination
Boiling disposed slurry is carried out to chlorination, ensure to contain sour 0.13g/L before chlorination, chloride 0.05g/L after chlorination, contains alkali 20g/m after chlorination
3.
4. bleaching
Slurry after chlorination is sent into Bellmer and bleaches, keep starching after slurry dense 4.5%, bleaching time 40 minutes, 35 DEG C of temperature; Bleach chloride 0.1g/L, contain alkali 40g/m
3.
5. acid treatment
Add hydrochloric acid, 40 minutes acid treatment time, containing sour 0.5g/L, quality after bleaching: whiteness 80%, ash 0.3%, irony 35ppm, alpha cellulose 92%, the degree of polymerization 532, manufactures paper with pulp, is packaged as quantitative 400-900g/m through paper machine
2wood pulps.
The main quality index of wood pulp finished product: viscosity 11.0mpa.s, alpha cellulose 91.0%, ash 0.17%, irony 30ppm, whiteness 85%, moisture content 12.3%, reactivity worth 88.1s, the degree of polymerization 488, little dust 100m m
2/ Kg.
Embodiment 2
1. get the raw materials ready
Pile up to the alkali that is 42g/L by Belt Conveying feeding hydrabrusher through concentration on request after on conveyer and spray sending paper level wood-pulp board, send into squeezer and carry out entering rotary spherical digester after extrusion dehydration.
2. boiling
Adopt rotary spherical digester alkaline cooking, the slurry having flooded is sent into rotary spherical digester and carry out boiling, keep amount of caustic soda to account for over dry slurry 15%, bath raio 1: 3.5,90 minutes heating-up times, temperature retention time 90 minutes, 171 DEG C of holding temperatures, large steam bleeding, 45 minutes time, pressure 0.01Mpa.
3. chlorination
Boiling disposed slurry is carried out to chlorination, ensure to contain sour 0.15g/L before chlorination, chloride 0.08g/L after chlorination, contains alkali 40g/m3 after chlorination.
4. bleaching
Slurry after chlorination is sent into Bellmer and bleaches, keep starching after slurry dense 4.3%, bleaching time 50 minutes, temperature 45 C; Bleach chloride 0.15g/L, contain alkali 58g/m
3.
5. acid treatment
Add hydrochloric acid, 40 minutes acid treatment time, containing sour 1.0g/L, quality after bleaching: whiteness 82%, ash 0.25%, irony 33ppm, alpha cellulose 91%, the degree of polymerization 504, manufactures paper with pulp, is packaged as quantitative 400-900g/m through paper machine
2wood pulps.
The main quality index of wood pulp finished product: viscosity 10mpa.s, alpha cellulose 90.5%, ash 0.13%, irony 20ppm, whiteness 86%, moisture content 12.5%. reactivity worth 85.0s, little dust 80mm
2/ Kg, the degree of polymerization 472.
Embodiment 3
1. get the raw materials ready
Papermaking grade wood pulp plate is piled up to the alkali that is 43g/L by Belt Conveying feeding hydrabrusher through concentration on request after on conveyer and sprayed, send into squeezer and carry out entering rotary spherical digester after extrusion dehydration.
2. boiling
Adopt rotary spherical digester alkaline cooking, the slurry having flooded is sent into rotary spherical digester and carry out boiling, keep amount of caustic soda to account for over dry slurry 16%, bath raio 1: 3.6,100 minutes heating-up times, temperature retention time 110 minutes, 175 DEG C of holding temperatures, large steam bleeding, 50 minutes time, pressure 0.01Mpa.
3. chlorination
Boiling disposed slurry is carried out to chlorination, ensure to contain sour 0.17g/L before chlorination, chloride 0.13g/L after chlorination, contains alkali 48g/m after chlorination
3.
4. bleaching
Slurry after chlorination is sent into Bellmer and bleaches, keep starching after slurry dense 4.4%, bleaching time 80 minutes, temperature 50 C; Bleach chloride 0.26g/L, contain alkali 78g/m
3.
5. acid treatment
Add hydrochloric acid, 40 minutes acid treatment time, containing sour 1.45g/L, quality after bleaching: whiteness 83%, ash 0.2%, irony 30ppm, alpha cellulose 90.5%, the degree of polymerization 470, manufactures paper with pulp, is packaged as quantitative 400-900g/m through paper machine
2wood pulps.
The main quality index of wood pulp finished product: viscosity 9mpa.s, alpha cellulose 91.1%, ash 0.10%, irony 15ppm, whiteness 87%, moisture content 13.0%, reactivity worth 37s, little dust 60mm
2/ Kg, the degree of polymerization 470.
Claims (1)
1. a production process for modified papermaking grade wood pulp, is characterized in that it comprises following rapid:
(1) get the raw materials ready, papermaking grade wood pulp plate is piled up to after on conveyer, on request by Belt Conveying feeding hydrabrusher, through the dispersion of discongesting of alkali spray and agitator, send into squeezer and carry out, after extrusion dehydration, sending into rotary spherical digester;
(2) boiling, the slurry having flooded enters rotary spherical digester and carries out boiling, adds caustic soda, ensures that amount of caustic soda accounts for over dry slurry 13-20%, bath raio 1: 2-4, heating-up time 60-100 minute, temperature retention time 80-150 minute, holding temperature 160-180 DEG C;
(3) chlorination, carries out chlorination by boiling disposed slurry, adds hydrochloric acid, liquid chlorine, caustic soda, ensures that chlorination is front containing containing alkali 10-60g/m after chloride≤0.05-0.25g/L, chlorination after sour 0.12-0.18g/L, chlorination
3;
(4) bleaching, sends the slurry after chlorination into Bellmer and bleaches, and slurry is concentrated and ensures after slurry, to starch dense 4.5%; Add bleaching liquor, bleaching time 30-90 minute, temperature 35-50 DEG C;
(5) acid treatment, adds hydrochloric acid, 40 minutes acid treatment time, and enter and float pond through spray, containing acid>=0.5-1.5g/L, manufacture paper with pulp, be packaged as fixed heavy 400-900g/m through paper machine
2wood pulps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410123819.7A CN103952937A (en) | 2014-03-24 | 2014-03-24 | Modified papermaking grade wood pulp production technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410123819.7A CN103952937A (en) | 2014-03-24 | 2014-03-24 | Modified papermaking grade wood pulp production technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103952937A true CN103952937A (en) | 2014-07-30 |
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ID=51330275
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410123819.7A Pending CN103952937A (en) | 2014-03-24 | 2014-03-24 | Modified papermaking grade wood pulp production technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108060597A (en) * | 2017-11-28 | 2018-05-22 | 安徽比伦生活用纸有限公司 | A kind of production method of the household paper pulp of environmental protection and energy saving |
-
2014
- 2014-03-24 CN CN201410123819.7A patent/CN103952937A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108060597A (en) * | 2017-11-28 | 2018-05-22 | 安徽比伦生活用纸有限公司 | A kind of production method of the household paper pulp of environmental protection and energy saving |
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Application publication date: 20140730 |