CN101660282B - Method for preparing all cotton stalk cellulose by adopting mechanical-active oxygen method - Google Patents
Method for preparing all cotton stalk cellulose by adopting mechanical-active oxygen method Download PDFInfo
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- CN101660282B CN101660282B CN200910018269.1A CN200910018269A CN101660282B CN 101660282 B CN101660282 B CN 101660282B CN 200910018269 A CN200910018269 A CN 200910018269A CN 101660282 B CN101660282 B CN 101660282B
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 67
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000001301 oxygen Substances 0.000 title claims abstract description 60
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 34
- 229920002678 cellulose Polymers 0.000 title claims abstract description 9
- 239000001913 cellulose Substances 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 34
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 26
- 230000003647 oxidation Effects 0.000 claims abstract description 22
- 238000004061 bleaching Methods 0.000 claims abstract description 18
- 238000000227 grinding Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 47
- 239000002002 slurry Substances 0.000 claims description 27
- 239000007844 bleaching agent Substances 0.000 claims description 17
- 238000002803 maceration Methods 0.000 claims description 16
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 14
- 102000016938 Catalase Human genes 0.000 claims description 9
- 108010053835 Catalase Proteins 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- -1 tert-butyl group alcohol peroxide Chemical group 0.000 claims description 7
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 238000010009 beating Methods 0.000 claims description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 claims description 5
- 239000004137 magnesium phosphate Substances 0.000 claims description 5
- 229960002261 magnesium phosphate Drugs 0.000 claims description 5
- 229910000157 magnesium phosphate Inorganic materials 0.000 claims description 5
- 235000010994 magnesium phosphates Nutrition 0.000 claims description 5
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 101710188971 Catalase-3 Proteins 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 3
- 101710171243 Peroxidase 10 Proteins 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 16
- 238000004898 kneading Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 2
- 238000004821 distillation Methods 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 238000005470 impregnation Methods 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 238000004537 pulping Methods 0.000 abstract 1
- 241000219146 Gossypium Species 0.000 description 49
- 230000003213 activating effect Effects 0.000 description 9
- 229920001131 Pulp (paper) Polymers 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000009835 boiling Methods 0.000 description 5
- 239000013043 chemical agent Substances 0.000 description 4
- 239000003623 enhancer Substances 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- MAYPHUUCLRDEAZ-UHFFFAOYSA-N chlorine peroxide Chemical compound ClOOCl MAYPHUUCLRDEAZ-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 241001504664 Crossocheilus latius Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 241000610628 Trichoptilium incisum Species 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- BUIMWOLDCCGZKZ-UHFFFAOYSA-N n-hydroxynitramide Chemical compound ON[N+]([O-])=O BUIMWOLDCCGZKZ-UHFFFAOYSA-N 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 229940089401 xylon Drugs 0.000 description 1
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Abstract
The invention relates to a method for preparing all cotton stalk cellulose for construction, paper making and other applications by taking cotton stalks as raw materials and adopting a mechanical-active oxygen method. The method comprises the following steps: tearing, crushing and kneading the cotton stalks the impurities of which are removed into a velvet shape, adding impregnation liquid for pre-oxidation and stirring the mixture; grinding and defibering, grinding and concentrating the materials subjected to the grinding and defibering, simultaneously adding active oxygen defibrination bleaching liquid for bleaching; carrying out pressurizing turbulence final bleaching on high-concentration pulp subjected to grinding concentration and bleaching and preparing all cotton stalk cellulose pulp for making paper; and concentrating, filtering, dewatering or drying the all cotton stalk cellulose pulp to obtain the all cotton stalk cellulose for construction and other industries. The method has high pulp yield, effectively eliminates barky and rotten patches of the all cotton stalk cellulose, ,is free from distillation, cannot generate pulping black liquid seriously polluting the ecological environment and has the characteristics of good whiteness, obvious energy-saving effect, simple process, convenient operation, little investment, low cost and the like.
Description
One, technical field
The present invention relates to a kind ofly take cotton stem as raw material application " machinery---active oxygen method ", the method for preparing all cotton rod fibers.Specifically take cotton stem as raw material, with the method for " machinery---active oxygen method " production building, papermaking and other purposes fiber.This method is equally applicable to utilize other grass straw, reed bar, bamboo wood, shrub etc. as raw material, with the fibrous matter of production such use.
Two, background technology
Forest is the important ecological resources of the earth, and it is except preventing erosion, regulate the climate etc. effect, the effect of also undertaking absorbing carbon dioxide, releasing oxygen.Yet the forest reserves in the world are just with annual 700 * 10 at present
8m
2decrease of speed, the forest reserves, for the production of wood pulp papermaking, are to cause the forest reserves to add one of major reason of quick depletion; Therefore, find the renewable fibrous raw material of alternative wood pulp papermaking very urgent.
Because cotton stalk integrates bast fiber and cane wood fibre, its chemical composition is in close proximity to leaf wood material (in Table 1).
Table 1: cotton haulm raw material chemical composition (%) and average fiber long (mm)
Data source: < < Plant Fiber Chemistry teaching material > > China Light Industry Press 2001
China Shi Gechanmian big country, produces high-quality cotton stalk per year more than tens million of tons, can to the year life resource utilization of this similar leaf wood, be less than 2O% at present, and people want to utilize this huge resource to replace timber to produce paper pulp fiber for many years.
Feature just because of cotton stalk is that bast and cane are combined into one, and stiff spot and rotten spot on its bast are not easily separated, can not produce for a long time in order to cotton rod fibers slurry papermaking, that substitute xylon paper pulp.In the last few years, though there is the cotton stalk of the enterprise of only a few, be that raw material is produced and can, in order to the cotton rod fibers paper pulp of papermaking, be there is following shortcoming: 1, its complex process, the equipment needing is many, and investment is large; 2, consume energy highly, still exist problem of environmental pollution; 3, can not produce white cotton stalk fiber paper pulp, that is to say can not be in order to the production of white paper.
Three, summary of the invention:
The object of the invention is in order to solve the deficiency of above-mentioned technology: the method that a kind of " machinery---active oxygen method " preparing all cotton rod fibers is provided.A kind of method that it is under mechanical enhancer effect, chemical agent synergy is produced white cotton rod fibers slurry, its non-evaporating boiling, obvious energy conservation not only, and do not produce the black liquor of pulp making of serious pollution of ecological environment.
Technical scheme of the present invention is: will go deimpurity cotton stalk to tear, pulverize and rub into velvet shape, and adding deployed maceration extract to carry out pre-oxidation, and stirring; Again the material after pre-oxidation is ground and discongested, the material after grinding is discongested grinds concentrated again, adds active oxygen defibrination bleaching liquid to bleach simultaneously; Pulp density after concentrated is 25～30%; Underflow after grinding concentrated bleaching is pressurizeed, and turbulent flow is whole to be floated, just can preparing all cotton rod fibers slurry.
Its specific embodiment is as follows:
1, raw material is prepared:
Arrange cotton stalk, remove foreign material, cotton stalk is torn and pulverized, then rub into velvet shape material.
2, produce fiber:
2.1 give oxidation processes: will in velvet material, add deployed maceration extract to carry out pre-oxidation, and stir; Material is discongested, carry out pre-reaction simultaneously; Pre-oxidation temperature is 70～80 ℃, and the time of pre-oxidation is controlled at 40～80 minutes.
Composition in maceration extract, be by weight: the content of active oxygen A is that content that the content of 3～1O%, active oxygen B is >=3 μ mol/L, active oxygen D for the content of >=2.5 μ mol/L, active oxygen C is 0.3～0.8%, active calcium oxide is 10～50%, sodium metasilicate is 1.5%, magnesium phosphate is 0.15%, the content of DTPA is 0.1%, all the other are water, pH value 10～11.
Wherein: active oxygen A is hydrogen peroxide, active oxygen B is tert-butyl group alcohol peroxide, and active oxygen C is catalase, and active oxygen D is manganese catalase.
2.2 grind and to discongest processing: by giving material after oxidation processes, grinds and discongest processing, the compression ratio that evenly rolls material is >=4:1, beating degree >=17% of material, form velvet shape fine fibre, cellulose in separation of material cell interbed, forms slightly slurry, and color and luster is from the brown yellow that becomes.
2.3 bleachings are concentrated: the thick slurry that above-mentioned grinding is discongested after processing adds active oxygen defibrination bleaching agent, bleach, and concentrate, and form slip.Bleach concentrated temperature be controlled at≤60 ℃; Pulp density after concentrated is controlled at 25～30%.
The addition of active oxygen defibrination bleaching agent by its weight ratio is:
Active oxygen defibrination bleaching agent: cotton stalk=(0.04～0.06): 1
The formula of active oxygen defibrination bleaching agent by dry cotton stalk weight ratio is: hydrogen peroxide 3～6%, catalase 2.5～5 μ mol/Kg, manganese catalase-3～6 μ mol/Kg, tert-butyl group alcohol hydrogen peroxidase 10 .3～0.6%.To now, cotton stalk is all discongested into monfil, and oxygen is grinding under the invigoration effect of heating power from beginning to end, the basic stripping such as lignin, and fibre whiteness reaches more than 70%.
3, float eventually processing:
It is l0～l2% that the concentrated slip of producing of bleaching (in slip now, activating oxide still has approximately 40～50% of former addition to exist) water is adjusted to concentration, temperature is adjusted to 70～80 ℃, again slip is forced into 2MPa, and stirs simultaneously, the time is 30～45 minutes.Just can preparing all cotton rod fibers slurry.This cotton rod fibers slurry can supply paper grade (stock).In the waste liquid producing, contain part residual activity oxide, can be for preparing maceration extract in pre-oxidation treatment after processing a little.
When needs are for building or other etc. during industry, the cotton rod fibers slurry for paper grade (stock) of producing is concentrated, filters, is dewatered or dry just can, the waste water of generation, owing to containing the residual activating oxide of part, after processing a little, also can be for allotment maceration extract.
A kind of method that the present invention is under mechanical enhancer effect, chemical agent synergy is produced white cotton rod fibers slurry, to utilize under the invigoration effect of mechanical agitation, pressure, activating oxide can be contacted more fully with cotton rod fibers, also can infiltrate stiff spot and the rotten spot on cotton stalk bast, make its cracking and remove its look, improve the whiteness of cotton rod fibers slurry, met the need of production of blank sheet of paper; Whole process of the present invention does not need boiling to save a large amount of energy; The waste water producing, contains the residual activating oxide of part, slightly after treatment can reuse, do not produce the black liquor of pulp making of serious pollution of ecological environment.Therefore, to have fiber productivity high in the present invention; Effectively eliminated stiff spot and rotten spot, whiteness is good; Non-evaporating boiling, obvious energy conservation; Do not produce the black liquor of pulp making of serious pollution of ecological environment; Technique is simple, easy to operate, small investment, the feature such as cost is low.
Four, the specific embodiment:
The present invention a kind ofly be take cotton stem as raw material, under mechanical enhancer effect, chemical agent synergy produces the method for white cotton rod fibers slurry, be will go deimpurity cotton stalk to tear, pulverize and rub into velvet shape, add deployed maceration extract to carry out pre-oxidation, and stir; Again the material after pre-oxidation is ground and discongested, the material after grinding is discongested grinds concentrated again, adds active oxygen defibrination bleaching liquid to bleach simultaneously; The turbulent flow that again underflow after grinding concentrated bleaching pressurizeed floats eventually, just can preparing all cotton rod fibers slurry.
Embodiment:
1, raw material is prepared:
Arrange cotton stalk, remove foreign material, with shredder, cotton stalk is torn and pulverized, then with kneading machine, rub into velvet shape material.
2, produce fiber:
2.1 give oxidation processes: velvet material is put into the oxidation reactor that gives that machinery is discongested device is housed, add deployed maceration extract to give oxidation reaction, and start machinery and discongest device, stir material is discongested; Pre-oxidation temperature is 70～80 ℃, and the time of pre-oxidation is controlled at 40～80 minutes.The present embodiment is 50～60 minutes.
Composition in maceration extract, by dry cotton stalk weight ratio, be: the content of active oxygen A is that content that content that the content of 3～1O%, active oxygen B is >=2.5 μ mol/L, active oxygen C is >=3 μ mol/L, active oxygen D is 0.3～0.8%, active calcium oxide is 10～50%, sodium metasilicate is 1.5%, magnesium phosphate is 0.15%, the content of DTPA is 0.1%, all the other are water, pH value 10～11.
The optimization of maceration extract forms, be by weight: the content that the content of active oxygen A is 5～8%, the content of active oxygen B is 2.5～3.0 μ mol/L, active oxygen C is that the content of 3.0～3.5 μ mol/L, active oxygen D is 0.5～0.7%, active calcium oxide is 28～32%, sodium metasilicate is 1.5%, magnesium phosphate is 0.15%, the content of DTPA is 0.1%, all the other are water, pH value 10～11.The present embodiment is to adopt this optimization to form.
Wherein: active oxygen A is hydrogen peroxide, active oxygen B is tert-butyl group alcohol peroxide, and the present embodiment is tert-butyl group alcohol hydrogen peroxide, and also available other tert-butyl group alcohol peroxide replaces, as: tert-butyl group alcohol hyponitric acid, tert-butyl group alcohol chlorine peroxide etc.; Active oxygen C is catalase, and active oxygen D is manganese catalase.
2.2 grind and to discongest processing: the material material giving after oxidation processes is sent into hobboing cutter grinder through spiral shove device, grind and further discongest processing, the compression ratio that evenly rolls material is >=4:1, beating degree >=17% of material.Grinding is discongested and can be implemented by double helix roll-type stone roller cutter machine, and beating degree can be ground the rotating speed of cutter machine and be ground cutter gap and realize by adjustment; Grind fluffer to adjustment of rotational speed at 800～1200 revs/min; Gap blade is adjusted into 0.3～0.6mm.By grinding, discongest after processing, material brooming rate reaches more than 99%, and the cellulose in isolated cell interbed forms slightly slurry, and color and luster is from the brown yellow that becomes.
The dense mill of 2.3 bleaching: the thick slurry that above-mentioned grinding is discongested after processing is sent into high-density paste mill through spiral shove device, adds active oxygen defibrination bleaching agent simultaneously, bleaches, and carries out high consistency refining, forms slip.Bleaching underflow temperature be controlled at≤60 ℃, pulp density is controlled at 25～30%.
The addition of active oxygen defibrination bleaching agent by its weight ratio is:
Active oxygen defibrination bleaching agent: cotton stalk=(0.04～0.06): 1
The formula of active oxygen defibrination bleaching agent by dry cotton stalk weight ratio is: hydrogen peroxide 3～5%, catalase 2.5～5 μ mol/L, manganese catalase-3～6 μ mol/L, tert-butyl group alcohol hydrogen peroxidase 10 .3～0.6%.
To now, cotton stalk is all discongested into monfil, and active oxygen is under the invigoration effect of mill heating power, the basic stripping such as lignin, and fibre whiteness reaches more than 70%.
3, float eventually processing:
The concentrated slip of producing of bleaching (in slip now, activating oxide still has approximately 40～50% of former addition to exist) is sent into pressure type storage tank by conveying worm, it is l0～l2% that water is adjusted to concentration by slip, temperature is adjusted to 70～80 ℃, again slip is forced into 2MPa, and stir (as by supercharging turbulator or compression pump etc.), the time is 30～45 minutes. simultaneouslyUnder mechanical stirring action, remaining activating oxide fully contacts with the fiber in slip, and remaining activating oxide, under the effect of pressure, has further been strengthened active function, thereby can eliminate " the yellow head " of the cotton stalk pulp that other technique is difficult to remove; Meanwhile, under the effect of pressure, make active oxygen can enter better residual stiff spot and rotten spot inside, make its abundant cracked degraded.Just can preparing all cotton rod fibers slurry.Fibre whiteness now can reach more than 76%, and this cotton rod fibers slurry can supply paper grade (stock).In the waste liquid producing, contain part residual activity oxide, can be for preparing maceration extract in pre-oxidation treatment after processing a little.
The cotton rod fibers slurry situation of producing is as follows:
(1) whiteness detects:
The cotton rod fibers slurry of producing is put into water and disperse, under swabbing action, moulding in Buchner funnel, is then pressed on filter paper and flattens, and after air-dry, with YQ-Z-48B whiteness instrument, measuring whiteness is 80.2%ISO;
(2) fibre property is measured:
Use PFI beater, starch densely 10%, beater roll(er) and beater chamber gap are 0.2mm, and controlling beating consistency is 45 ° of SR, copy to get the scraps of paper and detect (in Table 2) on standard paper industry former:
Table 2: fibre property detects
| Project | Measured value | Assay method |
| Breaking length | 7.49Km | GB/T453-1989 |
| Tear index | 4.84mn﹒m2/g | GB/T455.1-1989 |
| Burst index | 5.48kpa﹒m2/g | GB/T453-1989 |
(3) slurry yield calculates:
Cotton rod fibers slurry being adjusted to 10% concentration, getting 100ml, is the plansifter screening of 0.15mm with sieve seam, and the slag sifting out slurry is dried to weight in l00 ℃ of baking oven, and calculating slurry yield is 7l.6%.
When needs are for building or other etc. during industry, the cotton rod fibers slurry for paper grade (stock) of producing is concentrated, filters, is dewatered or dry just can, the waste water of generation, owing to containing part residual activity oxide, after processing a little, also can be for allotment maceration extract.
Therefore, a kind of method that the present invention is under mechanical enhancer effect, chemical agent synergy is produced white cotton rod fibers slurry, to utilize under the invigoration effect of mechanical agitation, pressure, activating oxide can be contacted more fully with cotton rod fibers, also can infiltrate stiff spot and the rotten spot on cotton stalk bast, make its cracking and remove its look, improve the whiteness of cotton rod fibers slurry, met the need of production of blank sheet of paper; Whole process of the present invention does not need boiling to save a large amount of energy; The waste water producing, contains the residual activating oxide of part, slightly after treatment can reuse, do not produce the black liquor of pulp making of serious pollution of ecological environment.Therefore, the present invention has to such an extent that fiber productivity is high; Effectively eliminated stiff spot and rotten spot, whiteness is good; Non-evaporating boiling, obvious energy conservation; Do not produce the black liquor of pulp making of serious pollution of ecological environment; Technique is simple, easy to operate, small investment, the feature such as cost is low.
Claims (2)
1. the method for one kind " machinery---active oxygen method " preparing all cotton rod fibers, take cotton stalk as raw material, it is characterized in that: will go deimpurity cotton stalk to tear, pulverize and rub into velvet shape, and adding deployed maceration extract to carry out pre-oxidation, and stirring; Again the material after pre-oxidation is ground and discongested, material through grinding after discongesting grinds concentrated again, add active oxygen defibrination bleaching liquid to bleach, the underflow after grinding concentrated bleaching is pressurizeed, and turbulent flow is whole to be floated, and just can starch by preparing all cotton rod fibers simultaneously;
Its specific embodiment is as follows:
A, raw material are prepared:
Arrange cotton stalk, remove foreign material, cotton stalk is torn and pulverized, then rub into velvet shape material;
B, produce fiber:
B1, pre-oxidation treatment: will in velvet material, add deployed maceration extract to carry out pre-oxidation, and stir; Material is discongested, carry out pre-reaction simultaneously; Pre-oxidation temperature is 70～80 ℃, and the time of pre-oxidation is controlled at 40～80 minutes;
Composition in maceration extract is by weight: the content that the content that the content of active oxygen A is 3～10%, the content of active oxygen B is >=2.5 μ mol/L, active oxygen C is >=3 μ mol/L, active oxygen D is 0.3～0.8%, active calcium oxide is 10～50%, sodium metasilicate is 1.5%, magnesium phosphate is 0.15%, the content of DTPA is 0.1%, all the other are water, pH value 10～11;
Wherein: active oxygen A is hydrogen peroxide, active oxygen B is tert-butyl group alcohol peroxide, and active oxygen C is catalase, and active oxygen D is manganese catalase;
B2, grind and to discongest processing: the material after pre-oxidation treatment is ground and discongests processing, and the compression ratio that evenly rolls material is >=4:1, beating degree >=17% of material, form velvet shape fine fibre, cellulose in separation of material cell interbed, forms slightly slurry, and color and luster is from the brown yellow that becomes;
B3, bleaching are concentrated: the thick slurry that above-mentioned grinding is discongested after processing adds active oxygen defibrination bleaching agent, bleaches, and carries out dense mill, forms slip, and the temperature of bleaching dense mill is controlled at≤and 60 ℃, the pulp density after dense mill is controlled at 25～30%;
The addition of active oxygen defibrination bleaching agent by its weight ratio is:
Active oxygen defibrination bleaching agent: cotton stalk=(0.04～0.0 6): 1
The formula of active oxygen defibrination bleaching agent by dry cotton stalk weight ratio is: hydrogen peroxide 3～6%, catalase 2.5～5 μ mol/Kg, manganese catalase-3～6 μ mol/Kg, tert-butyl group alcohol hydrogen peroxidase 10 .3～0.6%;
C, float processing eventually:
It is l0～l2% that the concentrated slip water of producing of bleaching is adjusted to concentration, and temperature is adjusted to 70～80 ℃, then slip is forced into 2MPa, and stirs simultaneously, and the time is 30～45 minutes, just can starch by preparing all cotton rod fibers; The waste liquid producing can be for preparing maceration extract in pre-oxidation treatment after processing a little.
2. the method for " machinery---active oxygen method " according to claim 1 preparing all cotton rod fibers, it is characterized in that: the composition of described maceration extract, be by weight: the content that the content of active oxygen A is 5～7%, the content of active oxygen B is 2.5～3.0 μ mol/L, active oxygen C is that the content of 3.0～3.5 μ mol/L, active oxygen D is 0.5～0.7%, active calcium oxide is 28～32%, sodium metasilicate is 1.5%, magnesium phosphate is 0.15%, the content of DTPA is 0.1%, all the other are water, pH value 10～11.
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|---|---|---|---|---|
| CN102154870B (en) * | 2010-12-28 | 2012-09-05 | 宜宾长毅浆粕有限责任公司 | Method for preparing high-polymer pulp |
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