CN102995478B - Bleaching method for preparing high quality low pollution bamboo wood dissolving slurry - Google Patents
Bleaching method for preparing high quality low pollution bamboo wood dissolving slurry Download PDFInfo
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- CN102995478B CN102995478B CN201110267128.0A CN201110267128A CN102995478B CN 102995478 B CN102995478 B CN 102995478B CN 201110267128 A CN201110267128 A CN 201110267128A CN 102995478 B CN102995478 B CN 102995478B
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Abstract
The invention relates to a bleaching method for preparing a high quality low pollution bamboo wood dissolving slurry, which comprises the following steps: 1) removing parenchyma cells, employing a sieve method or a slurry washing method for removing parenchyma cells; 2) performing an oxidation reaction to remove a transition metal compound, removing boiled residual lignin in the unbleached slurry, performing ozone bleaching on washed slurry; 3) refining alkali in a reinforced mode; 4) bleaching chlorine dioxide; and 5) processing by acidifying at high temperature. According to the invention, delignification step by step, dynamic viscosity adjusting, whiteness enhancement, fine fiber generation reduction, and reaction capability activation are carried out on unbleached bamboo wood dissolving slurry, on the basis of increasing fiber strength, whiteness and filtering quality, the pollution load of the bleaching waste water is reduced, the bamboo wood dissolving slurry with high product quality and low environmental pollution is prepared, and provides a high quality raw material for producing the viscose fiber.
Description
Technical field
the present invention relates to and a kind ofly can improve dissolving pulp reactivity worth, intensity, improve strainability and reduce the method for bleaching of high-quality low stain bamboo wood dissolving pulp of environmental pollution, particularly relating to a kind of is raw material with bamboo wood, by adopting the alkali refining → ClO 2 bleaching → high temperature acidified process removing heteroproteose cell → oxidation reaction → strengthening to carry out the method for bleaching preparing high-quality low stain bamboo wood dissolving pulp that preparation feedback ability is good, strainability is high, low in the pollution of the environment, belong to fiber pulp manufacturing process technology field.
Background technology
traditional non-cotton cellulosic dissolving pulp method for bleaching, the chloride high CEH tri-stage bleaching method of main employing, i.e. chlorination (C), alkalization (E), hypochlorite (H) bleaching.This traditional chlorine bleach produces because shortcoming and harm are eliminated too greatly and gradually, because chlorine is a kind of strong oxidizer, reaction non-selectivity, while removing lignin, react with carbohydrate (cellulose), cellulose is damaged and degrades, its defect mainly contains: 1. finished product whiteness is low, intensity is low, remove lignin weak effect, and pulp respond is poor; Strainability and the spinnability of 2. obtained viscose glue are poor.
the contaminated wastewater that CEH tri-stage bleaching produces is very serious, except BOD, COD of high load capacity, also has a large amount of organic chlorides (AOX), some toxicity is very big, have strong carcinogenic, waste water is difficult to process, also has most organic chloride not degrade in biochemical treatment.Bleaching water consumption is high.Therefore, CEH tri-stage bleaching does not meet the requirement improving quality, protection of the environment, economize energy, sustainable development.
bamboo wood dissolving pulp tool from cotton, that wooden dissolving pulp is different special performance, adopt the equipment and technology comparatively fallen behind at present, poor product quality, environmental protection is also difficult to up to standard, in preparation process, it is mainly manifested in the difference of the dissolving pulp such as cotton, wooden: fiber dynamic viscosity is wayward, and scattered error scope is large; Bleachability is poor; Respond is low.The main cause of this phenomenon is caused to have: the 1. existence of residual lignin in slurry; 2. metal ion; 3. extract; 4. fiber fines and heteroproteose cell; 5. bamboo wood kind.
if still adopt conventional CEH bleaching, and in order to reach the object improving pulp brightness and continue to remove residual lignin, can only be use strong chlorine to carry out oxidation processes, the consequence caused is that fibre strength acutely declines, the scattered error expanded range of dynamic viscosity, all degree can not ensure; Reactivity worth, strainability worsen.
Summary of the invention
the object of the invention is to solve the problems referred to above that prior art exists, and provide a kind of and can improve dissolving pulp reactivity worth, intensity, improve strainability and reduce the method for bleaching preparing high-quality low stain bamboo wood dissolving pulp of environmental pollution.The present invention is directed to bamboo wood dissolving pulp self characteristic in preparation process, by adopting the alkali refining → ClO 2 bleaching → high temperature acidified process method for bleaching removing heteroproteose cell → oxidation reaction → strengthening to overcome above shortcoming and problem, preparing pulping lighter color, intensity is high, respond good, bleaching dissolving bamboo pulp that strainability is high, low in the pollution of the environment.
the technical solution adopted in the present invention is: this method for bleaching preparing high-quality low stain bamboo wood dissolving pulp, is characterized in including following steps.
1. remove heteroproteose cell.
screening or pulp washing method is adopted to carry out removing of heteroproteose cell, wherein: screening: screening the pulp concentration 0.7-2.5%, sieve plate specification Φ 0.10-2.5mm, pulp purity≤200kgCOD/adt; Or pulp washing method: sizing concentration 0.5-3.0%, temperature 50-90 DEG C, pulp purity≤200kgCOD/adt.
in bamboo wood, contained cell mainly contains fibrocyte, parenchyma cell, conduit, lithocyte, epidermal cell etc.Bamboo pulp fiber cell accounts for 60 ~ 70% of gross area ratio, lower than needlebush higher than general careless class.Lithocyte is more, accounts for 20 ~ 30% of the gross area, is one of feature of bamboo.Heteroproteose cell is referred to as below parenchyma cell, conduit, lithocyte, epidermal cell and part fiber fines.Through microscopic examination, the size of heteroproteose cell is between 5-110um, and when heteroproteose cell is more, the water filtering performance of slurry is poor.Through analysis to heteroproteose cell chemical composition, its lignin content, ash, iron part are high, and lignin content is up to 48.6%.
the existence of heteroproteose cell destroys the intensity of pulping, reduces into pulp brightness, the raising of the reactivity worth of restriction, removes heteroproteose cell and is conducive to improving reactivity worth, be conducive to the spinnability improving fiber, improve fibre strength and whiteness.
2. oxidation reaction.
(1) acidizing pretreatment.
in the disposed slurry removing heteroproteose cell, add pretreating agent, finishing agent can be inorganic acid, also can be organic acid.Technological requirement is.
pretreatment reaction PH :≤6.
pretreatment time: 10-40 divides.
pretreatment temperature: 20-60 DEG C.
1-3kg/adt is measured with acid.
amount of chelant: 1-2 ‰.
in slurrying phase process, transition metal to be retained in paper pulp and to cause occurring in the side reaction of oxidation reaction section, oxygen delignification selective influenced.In order to avoid harmful side reaction, improve oxidation reaction section delignification efficiency, obtain the slurry of low kappa number high dynamic viscosity, transistion metal compound must be removed, and therefore the preliminary treatment of paper pulp is very necessary.
(2) oxygen delignification.
bamboo wood dissolving pulp will do not floated and oxygen Homogeneous phase mixing is placed in oxygen reactor through pretreated, make that oxygen and slurry are oxidized, decoloring reaction, continue to remove the residual lignin in brown stock material after boiling, improve slurry purity, and dynamic viscosity is slightly declined.Technological requirement is.
the oxygen reaction time: 30-90 divides.
reaction temperature: 50-105 DEG C.
oxygen consuming amount: 0.5-2.0%.
dynamic viscosity fall off rate: 5-15%.
purity after pulp washing :≤100kgCOD/adt.
in oxygen delignification process, the phenol anion of oxygen mainly and in lignin structure reacts, and produces phenol free radical, make lignin produce demethylation, and then aromatic ring open loop is degraded to water-soluble organic acid, reaches the effect removing lignin.
the major advantage of oxygen delignification is: improve bleaching process efficiency, allow shorter drift sequence; Without chlorion in waste liquid, by the process of sulfuric acid point recovery system; Reduce the chemical cost of follow-up drift section.
(3) ozone bleaching.
slurry through washing enters ozone reactor, reacts with ozone.Technological requirement is.
ozone usage: 0.4-1.0%.
reaction time: 1-10 divides.
temperature: 20-60 DEG C.
ozone concentration: 1.5-3.5%.
purity after pulp washing :≤50kgCOD/adt.
during ozone bleaching, can produce a large amount of active oxygen radicals in system, its oxidation potential is very high, the glycosidic linkage of polysaccharide can be made to rupture, the Main Function of ozone is adjustment slurry dynamic viscosity, and make dynamic viscosity control within the scope of technological requirement, slurry all spends raising; Its two, stronger active oxygen acts on chromophoric group reacting with it, improves pulp brightness.
3, the alkali refining of strengthening.
alkali refining medium is highly basic NaOH, and it is a relatively good nucleopilic reagent, and most of organic bound chlorine can be made to be removed, and reduces AOX; And neutralize part and the acidic moiety of workshop section's degraded, the anion form obtained adds the solubility of lignin.With oxygen (O) and/or hydrogen peroxide (H
2
o
2
) reinforced alkaline refines, when without serious cellulose degradation, D section chlorine dioxide expense can be reduced and reduces Kappa number.Further, oxygen (O) and hydrogen peroxide (H
2
o
2
) use can be added simultaneously or only add the one used wherein.Technological requirement is.
the alkali refining time: 30-90 divides.
PH：10.5-14。
temperature: 60-90 DEG C.
hydrogen peroxide (H
2
o
2
) consumption: 0.25-0.75%.
oxygen (O) consumption: 0.2-0.6%.
wash rear alkalinity :≤0.06 g/l.
4, ClO 2 bleaching.
for the self-characteristic of bamboo wood dissolving pulp, adopt element chlorine free bleaching after alkali refining, bleaching agent is chlorine dioxide.In bleaching process, chlorine dioxide reacts with lignin selectively and removes lignin; And cellulose degradation is few, fiber fines produces few, improves fibre strength; Retention of whiteness is good; In waste water, COD load is low, significantly reduces the large organic chloride content of toxicity.By ClO 2 bleaching bamboo wood dissolving pulp, effectively reduce fiber degradation, reduce lignin content, pulp activity is further improved, and respond, strainability improve.ClO 2 bleaching in carry out under dense condition, technological requirement is.
chlorine: 0.8-1.5%.
reaction density: 8-14%.
reaction temperature: 60-80 DEG C.
reaction time: 80-160 divides.
reaction acidity: 0.08-0.20g/l.
wash rear acid content :≤0.02 g/l.
5, high temperature acidified process.
when processing slurry with acid, Fe++, Mg++ or the Ca++ on cellulose exchanges by the H+ in acid, again becomes COOH(carboxyl), numerous metal ions is dissolved in water and washes away, thus reduces the ash of pulp.Use (high temperature peracid) treatment process of strengthening not only can reduce ash and irony, the pentose in dissolving pulp, glycal aldehydic acid can also be removed, thus greatly improve the respond of pulp, for yellow glue provides high-quality pulp.Acid treatment hydrochloric acid or sulfuric acid carry out, and technological requirement is.
reaction density: 4-8%.
reaction temperature: 50-80 DEG C.
reaction time: 30-90 divides.
reaction acidity: 0.8-1.8g/l.
wash rear acid content :≤0.02 g/l.
for realizing object of the present invention better, described chlorine dioxide bleaching stage also can be divided into two sections to carry out, and be called D1 section and D2 section, D1 section chlorine dosage accounts for the 55-80% of total chlorine amount; D2 section chlorine dosage accounts for the 20-45% of total chlorine amount.
compared with prior art, its beneficial effect is in the present invention.
by this process, to the delignification process of not floating bamboo dissolved pulp and carried out the degree of depth, activate fibrocellular performance, effectively have adjusted the dynamic viscosity scope of bamboo wood dissolving slurry, make it more stable homogeneous, improve whiteness and the intensity of slurry, by the bamboo wood dissolving pulp that this technical scheme is obtained, dynamic viscosity 10-26mpa.s, content of alphacellulose is greater than 95%, lignin content lower than 0.6%, finished product whiteness (ISO)>=86%.Reactivity worth < 250 seconds, fracture strength >=2.4CN/dtex done by viscose, wet breaking strength >=1.5CN/dtex, filters KW value 60-100ml.
in bleaching process, use ozone and chlorine dioxide action-reaction medicament, ozone bleaching strong adaptability, temperature is low, and the dissolved matter after bleaching is only the catabolite of lignin and carbohydrate, and chlorine dioxide reacts with lignin selectively and removes lignin; And cellulose degradation is few, fiber fines produces few, significantly reduces the large organic chloride content of toxicity.Thus the pollution that bleaching waste liquor causes is significantly reduced, bleaching effluent COD < 30kg/t air dried pulp, AOX < 0.08kg/t air dried pulp.
by above technical scheme, carry out delignification step by step, dynamic viscosity adjustment to not floating bamboo wood dissolving pulp, improved whiteness, reduced fiber fines generation, activated respond targetedly, on the basis of improving the quality such as fibre strength, whiteness, strainability, reduce the pollutional load of bleaching effluent, obtain the bamboo wood dissolving pulp that product quality is high, environmental pollution is low, produced for viscose and provide high-quality raw material.
by bleaching bamboo wood dissolving pulp, viscose, bleaching effluent that above technical scheme is obtained, contrast as follows with conventional CEH Bleaching Quality:
Specific embodiments
below in conjunction with embodiment, the invention will be further described.
this method for bleaching preparing high-quality low stain bamboo wood dissolving pulp that the present invention provides includes following steps.
1, heteroproteose cell is removed.
the existence of heteroproteose cell destroys the intensity of pulping, reduces into pulp brightness, the raising of the reactivity worth of restriction, removes heteroproteose cell and is conducive to improving reactivity worth, be conducive to the spinnability improving fiber, improve fibre strength and whiteness.Removing of heteroproteose cell mainly contains screening, pulp washing method.
embodiment 1.
screening the pulp concentration 0.7%.
sieve plate specification Φ 0.10mm.
pulp purity: 200kgCOD/adt.
embodiment 2.
screening the pulp concentration 2.5%.
sieve plate specification Φ 2.5mm.
pulp purity: 100kgCOD/adt.
embodiment 3.
sizing concentration 0.5%.
temperature 50 C.
pulp purity: 150kgCOD/adt.
embodiment 4.
sizing concentration 3.0%.
temperature: 90 DEG C.
pulp purity: 120kgCOD/adt.
2, oxidation reaction.
(1) acidizing pretreatment.
in the disposed slurry removing heteroproteose cell, add pretreating agent, finishing agent can be inorganic acid, also can be organic acid.
embodiment 5.
pretreating agent: hydrochloric acid.
pretreatment reaction PH :≤6.
pretreatment time: 40 points.
pretreatment temperature: 60 DEG C.
1kg/adt is measured with acid.
amount of chelant: 1 ‰.
embodiment 6.
pretreating agent: sulfuric acid.
pretreatment reaction PH :≤4.
pretreatment time: 25 points.
pretreatment temperature: 40 DEG C.
2kg/adt is measured with acid.
amount of chelant: 1.5 ‰.
embodiment 7.
pretreating agent: hydrochloric acid.
pretreatment reaction PH :≤2.
pretreatment time: 10 points.
pretreatment temperature: 20 DEG C.
3kg/adt is measured with acid.
amount of chelant: 2 ‰.
(2) oxygen delignification.
bamboo wood dissolving pulp will do not floated and oxygen Homogeneous phase mixing is placed in oxygen reactor through pretreated, make that oxygen and slurry are oxidized, decoloring reaction, continue to remove the residual lignin in brown stock material after boiling, improve slurry purity, and dynamic viscosity is slightly declined.
embodiment 8.
the oxygen reaction time: 30 points.
reaction temperature: 50 DEG C.
oxygen consuming amount: 0.5%.
dynamic viscosity fall off rate: 5%.
purity after pulp washing: 100kgCOD/adt.
embodiment 9.
the oxygen reaction time: 60 points.
reaction temperature: 80 DEG C.
oxygen consuming amount: 1.5%.
dynamic viscosity fall off rate: 10%.
purity after pulp washing: 80kgCOD/adt.
embodiment 10.
the oxygen reaction time: 90 points.
reaction temperature: 105 DEG C.
oxygen consuming amount: 2.0%
dynamic viscosity fall off rate: 15%.
purity after pulp washing: 60kgCOD/adt.
(3) ozone bleaching.
slurry through washing enters ozone reactor, reacts with ozone.
embodiment 11.
ozone usage: 0.4%.
reaction time: 10 points.
temperature: 20 DEG C.
ozone concentration: 1.5%.
purity after pulp washing: 50kgCOD/adt.
embodiment 12.
ozone usage: 0.7%.
reaction time: 5 points.
temperature: 40 DEG C.
ozone concentration: 2.5%.
purity after pulp washing: 40kgCOD/adt.
embodiment 13.
ozone usage: 1.0%.
reaction time: 1 point.
temperature: 60 DEG C.
ozone concentration: 3.5%.
purity after pulp washing: 30kgCOD/adt.
3, the alkali refining of strengthening.
embodiment 14.
the alkali refining time: 30 points.
PH：14。
temperature: 60 DEG C.
hydrogen peroxide (H
2
o
2
) consumption: 0.25%.
oxygen (O) consumption: 0.2%.
wash rear alkalinity: 0.06 g/l.
embodiment 15.
the alkali refining time: 60 points.
PH：10.5。
temperature: 75 DEG C.
hydrogen peroxide (H
2
o
2
) consumption: 0.75%.
wash rear alkalinity: 0.04 g/l.
embodiment 16.
the alkali refining time: 90 points.
PH：12。
temperature: 90 DEG C.
oxygen (O) consumption: 0.6%.
wash rear alkalinity: 0.03 g/l.
4, ClO 2 bleaching.
clO 2 bleaching in carry out under dense condition, ClO 2 bleaching herein also can be divided into two sections to carry out, and be called D1 section and D2 section, D1 section chlorine dosage accounts for the 55-80% of total chlorine amount; D2 section chlorine dosage accounts for the 20-45% of total chlorine amount.
embodiment 17.
chlorine: 0.8%.
reaction density: 8%.
reaction temperature: 60 DEG C.
reaction time: 80 points.
reaction acidity: 0.08g/l.
wash rear acid content: 0.005 g/l.
embodiment 18.
chlorine: 1.0%.
reaction density: 10%.
reaction temperature: 70 DEG C.
reaction time: 120 points.
reaction acidity: 0.15g/l.
wash rear acid content: 0.01 g/l.
embodiment 19.
chlorine: 1.5%.
reaction density: 14%.
reaction temperature: 80 DEG C.
reaction time: 160 points.
reaction acidity: 0.20g/l.
wash rear acid content: 0.02 g/l.
embodiment 20.
chlorine: 1.2%.
reaction density: 12%.
reaction temperature: 68 DEG C.
d1 section.
chlorine dosage accounts for 60% of total chlorine amount.
reaction time: 100 points.
reaction acidity: 0.10g/l.
wash rear acid content: 0.02 g/l.
d2 section.
d2 section chlorine dosage accounts for 40% of total chlorine amount.
reaction time: 60 points.
reaction acidity: 0.10g/l.
wash rear acid content: 0.01 g/l.
5, high temperature acidified process.
use (high temperature peracid) treatment process of strengthening not only can reduce ash and irony, the pentose in dissolving pulp, glycal aldehydic acid can also be removed, thus greatly improve the respond of pulp, for yellow glue provides high-quality pulp.Acid treatment hydrochloric acid or sulfuric acid carry out.
embodiment 21.
acidizer: hydrochloric acid.
reaction density: 4%.
reaction temperature: 50 DEG C.
reaction time: 30 points.
reaction acidity: 0.8g/l.
wash rear acid content: 0.1 g/l.
embodiment 22.
acidizer: sulfuric acid.
reaction density: 6%.
reaction temperature: 65 DEG C.
reaction time: 60 points.
reaction acidity: 1.4g/l.
wash rear acid content: 0.015 g/l.
embodiment 23.
acidizer: hydrochloric acid.
reaction density: 8%.
reaction temperature: 80 DEG C.
reaction time: 90 points.
reaction acidity: 1.8g/l.
wash rear acid content: 0.02 g/l.
it should be pointed out that the detailed description of the invention listed at this is only illustrative, and do not mean that and limit the scope of the invention, protection scope of the present invention is as the criterion with appending claims.
Claims (1)
1. prepare a method for bleaching for high-quality low stain bamboo wood dissolving pulp, it is characterized in that including following steps:
(1) heteroproteose cell is removed:
Screening or pulp washing method is adopted to carry out removing of heteroproteose cell, wherein:
Screening: screening the pulp concentration 0.7-2.5%, sieve plate specification Φ 0.10-2.5mm, pulp purity≤200kgCOD/adt; Or
Pulp washing method: sizing concentration 0.5-3.0%, temperature 50-90 DEG C, pulp purity≤200kgCOD/adt;
(2) oxidation reaction:
1) acidizing pretreatment:
In the disposed slurry removing heteroproteose cell, add pretreating agent, pretreating agent is inorganic acid or organic acid, and technological parameter is:
Pretreatment reaction PH :≤6,
Pretreatment time: 10-40 divides,
Pretreatment temperature: 20-60 DEG C
With acid amount 1-3 kg/adt,
Amount of chelant: 1-2 ‰;
2) oxygen delignification:
Bamboo wood dissolving pulp will do not floated and oxygen Homogeneous phase mixing is placed in oxygen reactor through pretreated, make that oxygen and slurry are oxidized, decoloring reaction, continue to remove the residual lignin in brown stock material after boiling, improve slurry purity, and dynamic viscosity is declined, technological parameter is:
The oxygen reaction time: 30-90 divides,
Reaction temperature: 50-105 DEG C,
Oxygen consuming amount: 0.5-2.0%
Dynamic viscosity fall off rate: 5-15%
Purity after pulp washing :≤100kgCOD/adt;
3) ozone bleaching:
Slurry through washing enters ozone reactor, and react with ozone, technological parameter is:
Ozone usage: 0.4-1.0%,
Reaction time: 1-10 divides;
Temperature: 20-60 DEG C,
Ozone concentration: 1.5-3.5%,
Purity after pulp washing :≤50kgCOD/adt;
(3) alkali refining strengthened:
Alkali refining medium is highly basic NaOH, with oxygen (O) and/or hydrogen peroxide (H
2o
2) reinforced alkaline refine, technological parameter is:
The alkali refining time: 30-90 divides,
PH：10.5-14，
Temperature: 60-90 DEG C,
Hydrogen peroxide (H
2o
2) consumption: 0.25-0.75%,
Oxygen (O) consumption: 0.2-0.6%,
Wash rear alkalinity :≤0.06 g/l;
(4) ClO 2 bleaching:
Adopt element chlorine free bleaching after alkali refining, bleaching agent is chlorine dioxide, ClO 2 bleaching in carry out under dense condition, technological requirement is:
Chlorine: 0.8-1.5%,
Reaction density: 8-14%
Reaction temperature: 60-80 DEG C,
Reaction time: 80-160 divides;
Reaction acidity: 0.08-0.20g/l,
Wash rear acid content :≤0.02 g/l;
(5) high temperature acidified process
Process slurry with hydrochloric acid or sulfuric acid, technological parameter is:
Reaction density: 4-8%
Reaction temperature: 50-80 DEG C,
Reaction time: 30-90 divides,
Reaction acidity: 0.8-1.8g/l,
Wash rear acid content :≤0.02 g/l;
Wherein said chlorine dioxide bleaching stage is divided into two sections to carry out, and be called D1 section and D2 section, D1 section chlorine dosage accounts for the 55-80% of total chlorine amount; D2 section chlorine dosage accounts for the 20-45% of total chlorine amount.
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| CN104790241B (en) * | 2015-05-12 | 2016-08-17 | 四川理工学院 | A kind of clean method for preparing of high-purity high-quality bamboo wood dissolving pulp |
| CN110629576B (en) * | 2019-08-27 | 2022-04-12 | 齐鲁工业大学 | Method for preparing dissolving pulp by completely chlorine-free bleaching of poplar sulfate pulp |
| CN112359631A (en) * | 2020-10-29 | 2021-02-12 | 陕西科技大学 | Method for bleaching chlorine-free bamboo pulp |
| CN114908596B (en) * | 2022-04-26 | 2024-02-09 | 赣南师范大学 | Method for preparing dissolving pulp by bleaching bamboo pulp, dissolving pulp and application thereof |
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