CN1308160A - Technological process of producing viscose fiber size with bamboo and timber material - Google Patents
Technological process of producing viscose fiber size with bamboo and timber material Download PDFInfo
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Abstract
The present invention relates to a technology for producing viscose fibre pulp by using bamboo material, and its technological process includes the following steps: preparing material, cutting material, screening, washing material, pre-hydrolyzing, washing material, steam cooking, tranferring, washing material, screening, defibering, removing sand, concentrating, chlorization and washing material, alkali refining and washing material, bleaching and washing material, acid treatment, washing material, removing sand, concentrating and dipping out. Said invention possesses the advantages of rich raw material source and low production cost.
Description
The present invention relates to a kind of technology of utilizing bamboo wood to produce cellulose viscose pulp.
Chemical fibre is as the raw material of textile industry, and its development grows with each passing day, data introduction according to statistics, and to middle nineteen nineties, the World chemical fiber production has accounted for 47% of textile fabric total amount, and wherein viscose accounts for chemical fibre about 1/5th again.The manufacturing of viscose, traditional in the world method are that to adopt needlebush be raw material, but along with the shortage with worldwide raw material of improving constantly of pulping technique, abroad, leaf wood also is used to produce viscose.In China, because cotton resource is than horn of plenty, and the content of cellulose of cotton linter is easy to make highly purified pulp up to more than 95%, and it is the raw material production cellulose viscose pulp that therefore most of producers adopt cotton linter.The method that adopts cotton linter to produce cellulose viscose pulp is to adopt alkaline cooking, free beating, selected purification basically, and three sections of CEH or NaClO single stage bleaching are refining to form.Its concrete technology is: get the raw materials ready → opener → alkali pre-preg → boiling → batch turning → washing → making beating → desanding → dehydration concentrates → (pre-acid → chlorination → alkalization) → bleaching → acid treatment → washing → desanding → concentrate → manufacture paper with pulp.Adopting needlebush, broadleaf is raw material, needs a large amount of timber of felling, and will influence environmental protection, destroys the ecological balance; The employing cotton linter is a raw material, and it is very serious that there is lack of raw materials, and therefore, it is imperative that new raw material is explored in exploitation.
The purpose of this invention is to provide the resourceful bamboo of a kind of employing is raw material, and wood substituted by bamboo utilizes bamboo wood to produce the technology of cellulose viscose pulp.
The objective of the invention is to be achieved through the following technical solutions:
Utilize the technology of bamboo wood production viscose glue pulp as follows:
(1) gets the raw materials ready: screening behind the bamboo wood blank, cleaning; Blank specification: long 20-30mm;
(2) prehydrolysis, wash material: prehydrolysis is carried out in boiling vessel, and the prehydrolysis technical conditions are: liquor ratio: 1: 2.5-3.5, temperature 160-180 ℃, time 100-180min; Band pressure liquid after prehydrolysis finishes, water flushing then;
(3) boiling, batch turning, wash material: boiling is carried out in boiling vessel, and the boiling technology condition is: total alkali 16-26% (NaOH meter) (to the oven dry stock amount), liquor ratio: 1: 2.5-3.5; Intensification total time: 150-240min, little steam bleeding number of times: 〉=2 times, holding temperature is 130-150 ℃ for the first time, temperature retention time: 60-120min, holding temperature: 155-175 ℃ for the second time, temperature retention time: 120-240min; Batch turning after the boiling, wash material; Cooking quality is: KmnO4 value: 4-10, and alpha cellulose: 〉=95.5%, DP: 〉=600DP;
(4) screening: adopt and jump the sieve screening;
(5) discongest: light cutter is discongested in fluffer, requires no little slurry group in the slurry, or is directly spurted by boiling vessel;
(6) desanding, concentrated: carry out desanding in desander, technical conditions are: it is dense to remove mortar: 0.7 ± 0.1%, and desanding pressure＞0.28MPa; Desanding is starched and densely is: 3.0-3.5% after thickener concentrates;
(7) chlorination, wash material: carry out in the chlorination tower, technical conditions are: the chlorination chlorine dosage: 60% (to totally applied chlorine), and the chlorination slurry is dense: 3.0-3.5%, time of chlorinating: 40-60min, chlorination temperature: normal temperature, the residual chlorine of chlorination: 〉=0.20g/l, pH value after the chlorination＜2 are washed till slurries and are neutral;
(8) alkali refining, wash material: carry out in alkalization tower or bleaching machine, technical conditions are: the alkali refining slurry is dense: 〉=5.0%, alkali charge 2.0-5.0% (oven dry stock amount relatively), alkali refining temperature: 50-90 ℃, alkali refining time: 60-90min is washed till residual alkali≤50g/m
3
(9) bleach, wash material: carry out in bleaching machine, technical conditions are: the bleaching chlorine dosage: 40% (to totally applied chlorine), temperature 38-45 ℃, bleaching alkalinity :≤250g/m
3, bleaching time 120-240min; Bleaching Quality requires: whiteness 〉=75%, and DP: 〉=450DP, viscosity: 〉=7.5mPas, alpha cellulose: 〉=93%, be washed till residual alkali
≤50g/m
3；
(10) acid treatment, wash material: acid treatment is carried out in bleaching machine, and technical conditions are: with acid amount (HCl): 2.0-5.0% (to the oven dry stock amount), time: 40-60min, temperature: normal temperature; Wash material after the acid treatment, wash residual acid :≤0.20g/l;
(11) desanding, concentrate, manufacture paper with pulp: carry out desanding in desander, desanding is after thickener makes concentration of slurry is 3.0-3.5%; Manufacture paper with pulp in pulp machine then, technical conditions are: quantitatively 〉=and 400g/m
2, moisture content: 8.5-13.0%.
The technical conditions of boiling also are provided with sulphidity: 0.1-28%, anthraquinone: 0.1-1.0%.
Bamboo wood is: cizu, bambusa textile, Xifeng Bamboo, fishscale bamboo, shank bamboo, press from both sides bamboo, green bamboo, Fang Zhu etc. in vain.
Bamboo is that a kind of distribution is very extensive, and plantation survives the annual living bamboo shoot well-thought-out plan in back, the fast growing and high yield fibrous raw material that 3-5 can grow into forest and cut down.To use the cizu the widest, that fiber is of fine quality to be example, every per mu yield can reach 600-800kg.There are bamboo class more than 40 genus, kind more than 400 in China, and the bamboo grove area reaches 4,200,000 hectares, is world bamboo resource first big country, and " wood substituted by bamboo " prospect is very wide.Bamboo grove mainly is made up of cellulose, lignin, pectin and starch etc., and wherein holocellulose content is at 40-50%, content of lignin 20-30%, ash 1-3%, pentosan 16-21% compares with needlebush, its ash and pentosan content height, content of lignin is low slightly.Average fiber length is slightly shorter than needlebush, and is longer than leaf wood.The bamboo fibrid is elongated hard straight, and thick walled fiber is more, and lumen is narrow, the fibr tissue densification.
The culm bar is the major part of using in the slurrying, and it is made up of cane and parenchymal tissue, and except that the epidermal area that ratio is seldom arranged, remainder is the pulse tube fiber bundle of vertically arranging and surrounds cellulosic parenchymal tissue in the cane.Lignin, parenchymal tissue, ring and siliceous epidermis are to need the main matter of removing in the pulping process in the fibre bundle.
The selection of process of the present invention:
Because purified pulp is mainly used in the derivative of production of cellulose, it requires the chemical purity of pulp very high, it is alpha cellulose content height, ash, iron part, hemicellulose, lignin, the resin equal size is low, and suitable average degree of polymerization and good respond arranged, need the lignin removed and bamboo is inner in large quantities because of containing, has only the application alkaline process, good being removed of ability simultaneously, also contains alkali-resisting pentosan about about 20% in it, can not in alkaline cooking, slough, so need take the method for prehydrolysis before boiling, make the hemicellulose hydrolysis stripping before boiling in the bamboo chip, even remain in the hemicellulose in the raw material, variation has also taken place in its The Nomenclature Composition and Structure of Complexes, be convenient to stripping when boiling, prehydrolysis simultaneously also destroys the primary wall of fiber, makes to be convenient to break away from pulping process, improve the respond of pulp, chemical bond between hemicellulose and the lignin is also at the fracture of the effect lower part of prehydrolysis, leachable a certain amount of lignin.Like this, through the bamboo class pulp after prehydrolysis one alkaline cooking, the content of its alpha cellulose, ash, pentosan and resin just can reach the requirement of cellulose viscose pulp.
In the cellulose of bamboo cane inside, the conducting tissue of keeping cells survival---conduit is arranged, it promptly becomes the infiltration lane of soup in digestion process, but because cane wall outer conductor is thin, inner conductor is thick, and bar wall density skin is bigger, internal layer is less, add the bamboo conduit and form irregular sealing state in the air-dry back of bamboo chip, cause bamboo in digestion process herb liquid infiltration difficulty, difficult steaming is separated evenly, so in the digesting technoloy control procedure, need the long temperature rise period, repeatedly little steam bleeding, and one section low pressure temperature retention time.
Simultaneously, because pit is very little on the bamboo fibrid wall, and it is very rare, and also contain condensation lignin about 25% in the thick walled fiber, make in bleaching process, bleaching liquor is difficult to enter the fiber inwall, under the situation of not damaging fiber, method for bleaching with routine is difficult to it is floated to the whiteness more than 78%, and the easy brightness reversion of pulping, at this situation, we have adopted new technology measures such as strong chlorination, alkali refining extracting, hypochlorite post-bleach, acid treatment, and strengthened intersegmental washing, make into pulp brightness height and stable.
Advantage of the present invention is that raw material sources are abundant, and production cost is low, and a splendid approach is provided for making rational use of resources.
Embodiments of the invention are as follows:
By described processing step of technique scheme and technical conditions operation, can produce qualified cellulose viscose pulp product.Through producing in batches, top-quality product rate reaches more than 90%.One of its end product quality standard (company standard: viscose staple fibre) as following table:
| Index name | Grade A | Goods of inferior quality | Third grade product |
| Dynamic viscosity mPas | ??9.0(1±8％) | ??9.0(1±10％) | ?9.0(1±14％) |
| Alpha cellulose: 〉=% | ?????93.0 | ?????92.5 | ???92.0 |
| 575 ℃ 725 ℃ of ash :≤% | ?????0.11 ?????0.10 | ?????0.13 ?????0.12 | ???0.16 ???0.15 |
| Iron part :≤PPM | ?????20 | ?????25 | ???30 |
| Whiteness: 〉=% | ?????80 | ?????78 | ???76 |
| Little dust: mm 2/ kg (over dry) 0.05-3.0mm 2??≤ | ?????140 | ?????180 | ???240 |
| Big dust: individual/kg (over dry)＞3.0mm 2????≤ | ?????1.0 | ?????1.8 | ???2.5 |
| Suction base number: % 〉= | ?????500 | ?????480 | ???450 |
| Resin: %≤ | ?????0.70 | ?????0.75 | ???0.75 |
| Pentosan :≤% | ?????3.0 | ??????????????4.0 | |
| Lignin: | Trace | ||
| Quantitative (g/m 2) fourdrinier wire: cylinder: | ????700±100 ????500±100 | Do not meet Grade A | |
| Delivery moisture content: % | ????10.0±1.5 | ???????????≤13.0 | |
Claims (3)
1, utilize bamboo wood to produce the technology of cellulose viscose pulp, it is characterized in that:
(1) gets the raw materials ready: screening behind the bamboo wood blank, cleaning; Blank specification: long 20-30mm;
(2) prehydrolysis, wash material: prehydrolysis is carried out in boiling vessel, and the prehydrolysis technical conditions are: liquor ratio: 1: 2.5-3.5, temperature 160-180 ℃, time 100-180min; Band pressure liquid after prehydrolysis finishes, water flushing then;
(3) boiling, batch turning, wash material: boiling is carried out in boiling vessel, and the boiling technology condition is: total alkali 16-26% (NaOH meter) (to the oven dry stock amount), liquor ratio: 1: 2.5-3.5; Intensification total time: 150-240min, little steam bleeding number of times: 〉=2 times, holding temperature is 130-150 ℃ for the first time, temperature retention time: 60-120min, holding temperature: 155-175 ℃ for the second time, temperature retention time: 120-240min; Batch turning after the boiling, wash material; Cooking quality is: KmnO4 value: 4-10, and alpha cellulose: 〉=95.5%, DP: 〉=600DP;
(4) screening: adopt and jump the sieve screening;
(5) discongest: light cutter is discongested in fluffer, requires no little slurry group in the slurry, or is directly spurted by boiling vessel;
(6) desanding, concentrated: carry out desanding in desander, technical conditions are: it is dense to remove mortar: 0.7 ± 0.1%, and desanding pressure＞0.28MPa; Desanding is starched and densely is: 3.0-3.5% after thickener concentrates;
(7) chlorination, wash material: carry out in the chlorination tower, technical conditions are: the chlorination chlorine dosage: 60% (to totally applied chlorine), and the chlorination slurry is dense: 3.0-3.5%, time of chlorinating: 40-60min, chlorination temperature: normal temperature, the residual chlorine of chlorination: 〉=0.20g/l, pH value after the chlorination＜2 are washed till slurries and are neutral;
(8) alkali refining, wash material: carry out in alkalization tower or bleaching machine, technical conditions are: the alkali refining slurry is dense: 〉=5.0%, alkali charge 2.0-5.0% (oven dry stock amount relatively), alkali refining temperature: 50-90 ℃, alkali refining time: 60-90min is washed till residual alkali≤50g/m
3
(9) bleach, wash material: carry out in bleaching machine, technical conditions are: the bleaching chlorine dosage: 40% (to totally applied chlorine), temperature 38-45 ℃, bleaching alkalinity :≤250g/m
3, bleaching time 120-240min; Bleaching Quality requires: whiteness 〉=75%, and DP: 〉=450DP, viscosity: 〉=7.5mPas, alpha cellulose: 〉=93%, be washed till residual alkali≤50g/m
3
(10) acid treatment, wash material: acid treatment is carried out in bleaching machine, and technical conditions are: with acid amount (HCl): 2.0-5.0% (to the oven dry stock amount), time: 40-60min, temperature: normal temperature; Wash material after the acid treatment, wash residual acid :≤0.20g/l;
(11) desanding, concentrate, manufacture paper with pulp: carry out desanding in desander, desanding is after thickener makes concentration of slurry is 3.0-3.5%; Manufacture paper with pulp in pulp machine then, technical conditions are: quantitatively 〉=and 400g/m
2, moisture content: 8.5-13.0%.
2, technology according to claim 1 is characterized in that the technical conditions of boiling also are provided with sulphidity: 0.1-28%, anthraquinone: 0.1-1.0%.
3, technology according to claim 2 is characterized in that bamboo wood is: cizu, bambusa textile, Xifeng Bamboo, fishscale bamboo, shank bamboo, press from both sides bamboo, green bamboo, Fang Zhu in vain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00135021A CN1088129C (en) | 2000-11-02 | 2000-12-08 | Technological process of producing viscose fiber size with bamboo and timber material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00130357 | 2000-11-02 | ||
| CN00130357.0 | 2000-11-02 | ||
| CN00135021A CN1088129C (en) | 2000-11-02 | 2000-12-08 | Technological process of producing viscose fiber size with bamboo and timber material |
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| Publication Number | Publication Date |
|---|---|
| CN1308160A true CN1308160A (en) | 2001-08-15 |
| CN1088129C CN1088129C (en) | 2002-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00135021A Expired - Fee Related CN1088129C (en) | 2000-11-02 | 2000-12-08 | Technological process of producing viscose fiber size with bamboo and timber material |
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