CN1737252A - Yellow willow alkaline hydrogen peroxide pulp making method - Google Patents
Yellow willow alkaline hydrogen peroxide pulp making method Download PDFInfo
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- CN1737252A CN1737252A CN 200510037091 CN200510037091A CN1737252A CN 1737252 A CN1737252 A CN 1737252A CN 200510037091 CN200510037091 CN 200510037091 CN 200510037091 A CN200510037091 A CN 200510037091A CN 1737252 A CN1737252 A CN 1737252A
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Abstract
This invention discloses a slurrying method of yellow willow alkality auricome, characterized in that it uses the yellow willow lignone as the raw material, processing the raw material in the total non-chlorine system 60-120 minutes in the temperature 165-175 Deg.C, wherein the non-chlorine system comprises caustic soda 16-20%, auricome 2-4%; then degrading the lignin and part of hemicellulose, and getting above 49% yellow willow paper pulp. Said invention is fit for separating the paper pulp of the yellow willow lignin raw material, and the pulp has high whiteness and good physical property.
Description
Technical field
The present invention relates to the pulping technique field, specifically be meant a kind of Yellow willow alkaline hydrogen peroxide pulp making method.
Background technology
Shrub mainly originates from arid area, China desert, and at present, the main shrub seeds in husky district have salix monogolica, caragana microphylla, hedysarum scoparium, Huang Liu, caragana, sweet illiteracy Chinese tamarisk etc.These shrubs are being checked winds and fixed drifting sand, are being conserved water and soil, water conservation, improving soil, improve the ecosystem, keep aspect such as the ecological balance and have unique function.Their afforestation technologies are simple, the survival rate height, and the remarkable benefit of checking winds and fixing drifting sand, artificial afforestration ratio in recent years rises year by year.The stump cycle of these shrub seeds (is example with Huang Liu) is 3～5 years, grows after 5 years not that the withered phenomenon of part appears in the yellow willow shrubbery top of stump, the growth decline, for many years not stump then can to put in order strain withered.The land occupation condition difference, stump cycle difference, the yellow willow total output of unit are is also different in the regular period.Shrub afforestation has become the pillar industry that sand is distinguished peasants and herdsmen's economic development with the shrub resources development and utilization.The shrub resource is low grade products except that a small amount of development and use at present, and outside shaving board, establishment product and animal feeding-stuff, major part is burnt as yule logs, and not only contaminated environment has also been wasted resource.
In the past few years, change has in various degree taken place in China's papermaking material structure.Generally wood pulp ratio (comprising domestic wood pulp and import pulp) from 2000 19% be increased to 23% of calendar year 2001, yet because the timber resources scarcity, self-produced wood pulp ratio is on a declining curve.Set up paper pulp raw material woods base, acceleration woods paper integrated system is very important for this reason.Carry out on this basis different seeds, Different Diameter level, adopt different pulping process Study on Technology,, be used to join the practicable method that various fine papers also are solution raw material problems of copying to obtain yield height, the measured paper pulp of matter.
The plain paper pulp of defibre need remove lignin and hemicellulose from lignocellulose raw material.The paper pulp of sulfate process (KP method) production at present accounts for half of global chemical pulp output, is dominating paper pulp market always.This is because the KP method is compared with other chemical methods and had: to raw material type require lower, can reclaim advantages such as alkali and energy, paper pulp machinery performance are good.Have still during yet the KP method is produced that air pollution is serious, scale of investment big, some shortcomings such as the adaptability of TCF bleaching is relatively poor are not solved.In the past few decades, many alternative pulping process occurred, every kind of method has its pluses and minuses.Hydrogen peroxide under alkali condition can with lignin reaction, at the bleaching agent that just is used as high lignin content paper pulp perhaps many years ago.McDonough and Kirk studies show that only about half of lignin can be removed in the southern pine kraft slurry in hydrogen peroxide bleaching.Generally speaking, hydrogen peroxide is a kind of weak oxidant, the reaction of it and lignin mainly be with the lignin side chain on carbonyl and two keys reaction, make its oxidation, change structure or with the side chain size degradation.The mechanism of hydrogen peroxide method bleaching mainly is to produce HOO under alkali condition
-, react with chromophore in the lignin, in addition HO that under the strong basicity situation, produces and O
2 -Free radical also participates in the dissolving of lignin and hemicellulose.The alkaline hydrogen peroxide method still is the effective ways of lignin separation in the agriculture waste raw material.Adopt the advantage of alkaline hydrogen peroxide slurrying to be not use sulfur-bearing regent, avoided the foul smell discharging in traditional KP method, environmental pollution is few, can promote paper industry not have the development that sulphur lacks chlorine or do not have chlorine pulping bleaching technology, compare with the Soda-AQ pulping process that generally adopts at present, do not exist and add line clogging and the scale problems that anthracene a kind of jade causes, cooking liquor and raw material can mix, cooking waste liquor can reclaim by simple process flow, the gained pulp brightness is higher, pulping process is easy, and application prospect is better.
In view of this,, particularly in the forestry waste, adopt novel alkaline hydrogen peroxide technology to prepare yellow willow paper pulp, not only help to solve the industrial pollution caused by paper manufacturing problem, simultaneously isolated pulp brightness height, bleaching easily from lignocellulose raw material.Thereby inquire into a kind of novel Yellow willow alkaline hydrogen peroxide method pulping process and have important practical significance and using value.
Summary of the invention
The objective of the invention is provides a kind of Yellow willow alkaline hydrogen peroxide pulp making method in order to solve the deficiencies in the prior art part.
Yellow willow alkaline hydrogen peroxide pulp making method of the present invention comprises following process conditions and step:
(1) raw material is prepared
Yellow willow matter fibrous raw material is allowanced for bark and the shredder fragmentation with the machine of allowancing for bark, and raw material does not have the branch crust and do not have whole stalk, vivid turning white, and no mildew, free from admixture, no dust after drying, are measured raw material moisture, and is standby;
(2) pulping process
Wood chip 100g (over dry raw material) reacts with cooking liquor in reactor, and keeping liquor ratio is 5: 1～4: 1, and the heating-up time is 2～3h; The boiling parameter be 16～20% NaOH, maximum temperature be 165～175 ℃, 2～4% hydrogen peroxide and under maximum temperature temperature retention time 60～120min, select paper pulp yield, Kappa number (Kappa value) and pulp viscosity to characterize the character of alkaline hydrogen peroxide paper pulp; After boiling finishes, reactor is taken out, cool off with flowing water rapidly, to be cooled to 22～30 ℃, paper pulp is separated with waste liquid, pulp washing is clean, with the sieve seam is the plansifter screening of 0.15～0.25mm, and the slag that sifts out slurry is dried to weight in 100～105 ℃ of baking ovens, calculate the yield of slag slurry; Screened stock is collected in the cloth bag, removes part moisture with seperator, and the concentration that makes slurry is 30%, weigh, be kept at then in the plastic bag, place in the refrigerator, Kappa number and pulp viscosity are measured according to national standard method GB/T 1546-1989 and GB/T1548-1989 respectively;
Described reactor is the 1000ml stainless steel reactor;
(3) pulp property detects
With the making beating of PFI mill, starch dense 9～12%, beater roll(er) and beater chamber gap are 0.2mm, the beating degree of control paper pulp is 43～46 ° of SR, on standard paper industry former, copy and get the scraps of paper, adopt national standard method GB/T 453-1989, GB/T 455.1-1989, GB/T 454-1989 to measure physical properties of pulp respectively;
(4) paper pulp bleaching process
The yellow willow shrub alkaline hydrogen peroxide slurry that obtains adopts HP or PP bleaching, and bleaching conditions is as follows:
HP bleaching (hypochlorite float-hydrogen peroxide float)
The H section: chlorine dosage 5～6%, bleaching time 90～100min, pH value 11～12,35～40 ℃ of temperature are starched densely 6～7%, and endpoint pH is not less than 8;
P section: H
2O
2Consumption 1～1.5%, bleaching time 60～70min; EDTA consumption 0.4～0.5%, 70～80 ℃ of temperature, starch dense 8～11%, original ph 10～12, Na
2SiO
3Consumption 1.5～2%, MgSO
4Consumption 0.1～0.15%;
PP bleaches (hydrogen peroxide two-stage floats)
P1 section: H
2O
2Consumption 1～1.5%, bleaching time 50～60min; EDTA consumption 0.3～0.4%, 80～90 ℃ of temperature, starch dense 10～12%, original ph 10～12, Na
2SiO
3Consumption 1.5～2%, MgSO
4Consumption 0.1～0.15%;
P2 section: H
2O
2Consumption 1.5～2%, bleaching time 60～70min; 90～100 ℃ of temperature, starch dense 10～12%, original ph 10～12, EDTA consumption 0.3～0.4%, Na
2SiO
3Consumption 1.5～2%, MgSO
4Consumption 0.1～0.15%;
The mensuration of whiteness: the paper pulp after will bleaching disperses, and moulding in Buchner funnel under swabbing action then is clipped in the middle pressing of filter paper, and whiteness is measured with whiteness instrument (YQ-Z-48B) in air-dry back.
The present invention compared with prior art has following advantage and beneficial effect:
1. adopt Yellow willow alkaline hydrogen peroxide pulp making method lignin degrading of the present invention and hemicellulose, the yellow willow chemical pulp yield height that obtains, and also this technology cost investment is less, pollutes and has also reduced widely, operates also easier;
2. the physical strength of the pulp brightness height that obtains with method of the present invention, paper pulp is higher, easily bleaching.
The specific embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1
(1) raw material is prepared
Yellow willow matter fibrous raw material is allowanced for bark and the shredder fragmentation with the machine of allowancing for bark, and raw material does not have the branch crust and do not have whole stalk, vivid turning white, and no mildew, free from admixture, no dust after drying, are measured raw material moisture, and is standby;
(2) pulping process
Wood chip 100g (over dry raw material) reacts with cooking liquor in the 1000ml stainless steel reactor, and keeping liquor ratio is 4: 1, and the heating-up time is 3h; The boiling parameter be 16% NaOH, maximum temperature be 170 ℃, 2% hydrogen peroxide and under maximum temperature temperature retention time 120min, select paper pulp yield, Kappa number and pulp viscosity to characterize the character of alkaline hydrogen peroxide paper pulp; After boiling finishes, reactor is taken out, cool off with flowing water rapidly, to be cooled to 25 ℃, paper pulp is separated with waste liquid, pulp washing is clean, with the sieve seam is the plansifter screening of 0.2mm, and the slag that sifts out slurry is dried to weight in 105 ℃ of baking ovens, and the yield of calculating thick slurry is 52.3%; Screened stock is collected in the cloth bag, removes part moisture with seperator, and making the concentration of slurry is 30%, weighs, and is kept at then in the plastic bag, places in the refrigerator, and screened yield is 47.6%.Kappa number and pulp viscosity are measured according to national standard method GB/T 1546-1989 and GB/T1548-1989 respectively, are respectively 22.5,643.7mL/g;
(3) pulp property detects
With the making beating of PFI mill, starch dense 10%, beater roll(er) and beater chamber gap are 0.2mm, the beating degree of control paper pulp is 45 ° of SR, on standard paper industry former, copy and get the scraps of paper, adopt national standard method GB/T453-1989, GB/T 455.1-1989, GB/T 454-1989 to measure physical properties of pulp respectively, pi of strength is respectively: fracture length 7.52km; Tear index 4.86mNm
2/ g; Burst index 5.52kPam
2/ g;
(4) paper pulp bleaching process
The yellow willow shrub alkaline hydrogen peroxide slurry that obtains adopts the HP bleaching, and bleaching conditions is as follows:
HP bleaching (hypochlorite float-hydrogen peroxide float)
The H section: chlorine dosage 6%, bleaching time 90min, pH value 11,38 ℃ of temperature are starched densely 6%, and endpoint pH is 8;
P section: H
2O
2Consumption 1.5%, bleaching time 60min; EDTA consumption 0.5%, 80 ℃ of temperature, starch dense 10%, original ph 11, Na
2SiO
3Consumption 1.5%, MgSO
4Consumption 0.1%;
The mensuration of whiteness: the paper pulp after will bleaching disperses, and moulding in Buchner funnel under swabbing action then is clipped in the middle pressing of filter paper, and it is 75.3%ISO that whiteness is measured with whiteness instrument (YQ-Z-48B) in air-dry back.
Embodiment 2
(1) raw material is prepared
Yellow willow matter fibrous raw material is allowanced for bark and the shredder fragmentation with the machine of allowancing for bark, and raw material does not have the branch crust and do not have whole stalk, vivid turning white, and no mildew, free from admixture, no dust after drying, are measured raw material moisture, and is standby;
(2) pulping process
Wood chip 100g (over dry raw material) reacts with cooking liquor in the 1000ml stainless steel reactor, and keeping liquor ratio is 5: 1, and the heating-up time is 2h; The boiling parameter be 18% NaOH, maximum temperature be 165 ℃, 3% hydrogen peroxide and under maximum temperature temperature retention time 60min, select paper pulp yield, Kappa number and pulp viscosity to characterize the character of alkaline hydrogen peroxide paper pulp; After boiling finishes, reactor is taken out, cool off with flowing water rapidly, to be cooled to 22 ℃, paper pulp is separated with waste liquid, pulp washing is clean, with the sieve seam is the plansifter screening of 0.15mm, and the slag that sifts out slurry is dried to weight in 100 ℃ of baking ovens, and the yield of calculating thick slurry is 49.8%; Screened stock is collected in the cloth bag, remove part moisture with seperator, the concentration that makes slurry is 30%, weigh, be kept at then in the plastic bag, place in the refrigerator, screened yield is 46.5%, Kappa number and pulp viscosity are measured according to national standard method GB/T 1546-1989 and GB/T1548-1989 respectively, are respectively 22.43,652.3mL/g;
(3) pulp property detects
With the making beating of PFI mill, starch dense 9%, beater roll(er) and beater chamber gap are 0.2mm, the beating degree of control paper pulp is 46 ° of SR, on standard paper industry former, copy and get the scraps of paper, adopt national standard method GB/T453-1989, GB/T 455.1-1989, GB/T 454-1989 to measure physical properties of pulp respectively, pi of strength is respectively: fracture length 7.46km; Tear index 4.78mNm
2/ g; Burst index 5.48kPam
2/ g;
(4) paper pulp bleaching process
The yellow willow shrub alkaline hydrogen peroxide slurry that obtains adopts the PP bleaching, and bleaching conditions is as follows:
PP bleaches (hydrogen peroxide two-stage floats)
P1 section: H
2O
2Consumption 1%, bleaching time 60min; EDTA consumption 0.3%, 90 ℃ of temperature, starch dense 10%, original ph 11, Na
2SiO
3Consumption 1.5%, MgSO
4Consumption 0.1%;
P2 section: H
2O
2Consumption 2%, bleaching time 60min; 90 ℃ of temperature, starch dense 10%, original ph 11, EDTA consumption 0.3%, Na
2SiO
3Consumption 1.5%, MgSO
4Consumption 0.1%;
The mensuration of whiteness: the paper pulp after will bleaching disperses, and moulding in Buchner funnel under swabbing action then is clipped in the middle pressing of filter paper, and it is 65.8%ISO that whiteness is measured with whiteness instrument (YQ-Z-48B) in air-dry back.
Embodiment 3
(1) raw material is prepared
Yellow willow matter fibrous raw material is allowanced for bark and the shredder fragmentation with the machine of allowancing for bark, and raw material does not have the branch crust and do not have whole stalk, vivid turning white, and no mildew, free from admixture, no dust after drying, are measured raw material moisture, and is standby;
(2) pulping process
Wood chip 100g (over dry raw material) reacts with cooking liquor in the 1000ml stainless steel reactor, and keeping liquor ratio is 4.5: 1, and the heating-up time is 2.5h; The boiling parameter be 20% NaOH, maximum temperature be 175 ℃, 4% hydrogen peroxide and under maximum temperature temperature retention time 90min, select paper pulp yield, Kappa number and pulp viscosity to characterize the character of alkaline hydrogen peroxide paper pulp; After boiling finishes, reactor is taken out, cool off with flowing water rapidly, to be cooled to 30 ℃, paper pulp is separated with waste liquid, pulp washing is clean, with the sieve seam is the plansifter screening of 0.25mm, and the slag that sifts out slurry is dried to weight in 102 ℃ of baking ovens, and the yield of calculating thick slurry is 49.7%; Screened stock is collected in the cloth bag, remove part moisture with seperator, the concentration that makes slurry is 30%, weigh, be kept at then in the plastic bag, place in the refrigerator, screened yield is 45.6%, Kappa number and pulp viscosity are measured according to national standard method GB/T 1546-1989 and GB/T1548-1989 respectively, are respectively 19.73,628.1mL/g;
(3) pulp property detects
With the making beating of PFI mill, starch dense 12%, beater roll(er) and beater chamber gap are 0.2mm, the beating degree of control paper pulp is 43 ° of SR, on standard paper industry former, copy and get the scraps of paper, adopt national standard method GB/T453-1989, GB/T 455.1-1989, GB/T 454-1989 to measure physical properties of pulp respectively, pi of strength is respectively: fracture length 7.27km; Tear index 4.53mNm
2/ g; Burst index 5.32kPam
2/ g;
(4) paper pulp bleaching process
The yellow willow shrub alkaline hydrogen peroxide slurry that obtains adopts the HP bleaching, and bleaching conditions is as follows:
HP bleaching (hypochlorite float-hydrogen peroxide float)
H section: chlorine dosage 5%, bleaching time 100min, pH value 12,40 ℃ of temperature; Starch dense 7%; Endpoint pH is 10;
P section: H
2O
2Consumption 1%, bleaching time 70min; EDTA consumption 0.4%, 70 ℃ of temperature, starch dense 8%, original ph 10, Na
2SiO
3Consumption 2%, MgSO
4Consumption 0.15%;
The mensuration of whiteness: the paper pulp after will bleaching disperses, and moulding in Buchner funnel under swabbing action then is clipped in the middle pressing of filter paper, and it is 73.9%ISO that whiteness is measured with whiteness instrument (YQ-Z-48B) in air-dry back.
Embodiment 4
(1) raw material is prepared
Yellow willow matter fibrous raw material is allowanced for bark and the shredder fragmentation with the machine of allowancing for bark, and raw material does not have the branch crust and do not have whole stalk, vivid turning white, and no mildew, free from admixture, no dust after drying, are measured raw material moisture, and is standby;
(2) pulping process
Wood chip 100g (over dry raw material) reacts with cooking liquor in the 1000ml stainless steel reactor, and keeping liquor ratio is 4: 1, and the heating-up time is 3h; The boiling parameter be 19% NaOH, maximum temperature be 172 ℃, 3.5% hydrogen peroxide and under maximum temperature temperature retention time 100min, select paper pulp yield, Kappa number and pulp viscosity to characterize the character of alkaline hydrogen peroxide paper pulp; After boiling finishes, reactor is taken out, cool off with flowing water rapidly, to be cooled to 30 ℃, paper pulp is separated with waste liquid, pulp washing is clean, with the sieve seam is the plansifter screening of 0.2mm, and the slag that sifts out slurry is dried to weight in 104 ℃ of baking ovens, and the yield of calculating thick slurry is 49.7%; Screened stock is collected in the cloth bag, remove part moisture with seperator, the concentration that makes slurry is 30%, weigh, be kept at then in the plastic bag, place in the refrigerator, screened yield is 46.1%, Kappa number and pulp viscosity are measured according to national standard method GB/T 1546-1989 and GB/T1548-1989 respectively, are respectively 21.07,639.6mL/g;
(3) pulp property detects
With the making beating of PFI mill, starch dense 10%, beater roll(er) and beater chamber gap are 0.2mm, the beating degree of control paper pulp is 45 ° of SR, on standard paper industry former, copy and get the scraps of paper, adopt national standard method GB/T453-1989, GB/T 455.1-1989, GB/T 454-1989 to measure physical properties of pulp respectively, pi of strength is respectively: fracture length 7.35km; Tear index 4.62mNm
2/ g; Burst index 5.39kPam
2/ g;
(4) paper pulp bleaching process
The yellow willow shrub alkaline hydrogen peroxide slurry that obtains adopts the HP bleaching, and bleaching conditions is as follows:
HP bleaching (hypochlorite float-hydrogen peroxide float)
H section: chlorine dosage 5.4%, bleaching time 95min, pH value 11.5,35 ℃ of temperature; Starch dense 6.5%; Endpoint pH is 9;
P section: H
2O
2Consumption 1.2%, bleaching time 65min; EDTA consumption 0.45%, 75 ℃ of temperature, starch dense 11%, original ph 12, Na
2SiO
3Consumption 1.8%, MgSO
4Consumption 0.12%;
The mensuration of whiteness: the paper pulp after will bleaching disperses, and moulding in Buchner funnel under swabbing action then is clipped in the middle pressing of filter paper, and it is 74.4%ISO that whiteness is measured with whiteness instrument (YQ-Z-48B) in air-dry back.
Embodiment 5
(1) raw material is prepared
Yellow willow matter fibrous raw material is allowanced for bark and the shredder fragmentation with the machine of allowancing for bark, and raw material does not have the branch crust and do not have whole stalk, vivid turning white, and no mildew, free from admixture, no dust after drying, are measured raw material moisture, and is standby;
(2) pulping process
Wood chip 100g (over dry raw material) reacts with cooking liquor in the 1000ml stainless steel reactor, and keeping liquor ratio is 5: 1, and the heating-up time is 2h; The boiling parameter be 17% NaOH, maximum temperature be 165 ℃, 2.5% hydrogen peroxide and under maximum temperature temperature retention time 60min, select paper pulp yield, Kappa number and pulp viscosity to characterize the character of alkaline hydrogen peroxide paper pulp; After boiling finishes, reactor is taken out, cool off with flowing water rapidly, to be cooled to 24 ℃, paper pulp is separated with waste liquid, pulp washing is clean, with the sieve seam is the plansifter screening of 0.15mm, and the slag that sifts out slurry is dried to weight in 100 ℃ of baking ovens, and the yield of calculating thick slurry is 50.9%; Screened stock is collected in the cloth bag, remove part moisture with seperator, the concentration that makes slurry is 30%, weigh, be kept at then in the plastic bag, place in the refrigerator, screened yield is 47.1%, Kappa number and pulp viscosity are measured according to national standard method GB/T 1546-1989 and GB/T1548-1989 respectively, are respectively 22.47,647.4mL/g;
(3) pulp property detects
With the making beating of PFI mill, starch dense 9%, beater roll(er) and beater chamber gap are 0.2mm, the beating degree of control paper pulp is 46 ° of SR, on standard paper industry former, copy and get the scraps of paper, adopt national standard method GB/T453-1989, GB/T 455.1-1989, GB/T 454-1989 to measure physical properties of pulp respectively, pi of strength is respectively: fracture length 7.48km; Tear index 4.81mNm
2/ g; Burst index 5.51kPam
2/ g;
(4) paper pulp bleaching process
The yellow willow shrub alkaline hydrogen peroxide slurry that obtains adopts the PP bleaching, and bleaching conditions is as follows:
PP bleaches (hydrogen peroxide two-stage floats)
P1 section: H
2O
2Consumption 1.5%, bleaching time 50min; EDTA consumption 0.4%, 80 ℃ of temperature, starch dense 12%, original ph 12, Na
2SiO
3Consumption 2%, MgSO
4Consumption 0.15%;
P2 section: H
2O
2Consumption 1.5%, bleaching time 70min; 100 ℃ of temperature, starch dense 12%, original ph 12, EDTA consumption 0.4%, Na
2SiO
3Consumption 2%, MgSO
4Consumption 0.15%;
The mensuration of whiteness: the paper pulp after will bleaching disperses, and moulding in Buchner funnel under swabbing action then is clipped in the middle pressing of filter paper, and it is 65.3%ISO that whiteness is measured with whiteness instrument (YQ-Z-48B) in air-dry back.
Embodiment 6
(1) raw material is prepared
Yellow willow matter fibrous raw material is allowanced for bark and the shredder fragmentation with the machine of allowancing for bark, and raw material does not have the branch crust and do not have whole stalk, vivid turning white, and no mildew, free from admixture, no dust after drying, are measured raw material moisture, and is standby;
(2) pulping process
Wood chip 100g (over dry raw material) reacts with cooking liquor in the 1000ml stainless steel reactor, and keeping liquor ratio is 4: 1, and the heating-up time is 3h; The boiling parameter be 20% NaOH, maximum temperature be 165 ℃, 3% hydrogen peroxide and under maximum temperature temperature retention time 80min, select paper pulp yield, Kappa number and pulp viscosity to characterize the character of alkaline hydrogen peroxide paper pulp; After boiling finishes, reactor is taken out, cool off with flowing water rapidly, to be cooled to 25 ℃, paper pulp is separated with waste liquid, pulp washing is clean, with the sieve seam is the plansifter screening of 0.2mm, and the slag that sifts out slurry is dried to weight in 100 ℃ of baking ovens, and the yield of calculating thick slurry is 49.8%; Screened stock is collected in the cloth bag, remove part moisture with seperator, the concentration that makes slurry is 30%, weigh, be kept at then in the plastic bag, place in the refrigerator, screened yield is 45.7%, Kappa number and pulp viscosity are measured according to national standard method GB/T 1546-1989 and GB/T1548-1989 respectively, are respectively 19.77,631.2mL/g;
(3) pulp property detects
With the making beating of PFI mill, starch dense 10%, beater roll(er) and beater chamber gap are 0.2mm, the beating degree of control paper pulp is 45 ° of SR, on standard paper industry former, copy and get the scraps of paper, adopt national standard method GB/T453-1989, GB/T 455.1-1989, GB/T 454-1989 to measure physical properties of pulp respectively, pi of strength is respectively: fracture length 7.31km; Tear index 4.57mNm
2/ g; Burst index 5.38kPam
2/ g;
(4) paper pulp bleaching process
The yellow willow shrub alkaline hydrogen peroxide slurry that obtains adopts the PP bleaching, and bleaching conditions is as follows:
PP bleaches (hydrogen peroxide two-stage floats)
P1 section: H
2O
2Consumption 1.2%, bleaching time 55min; EDTA consumption 0.35%, 85 ℃ of temperature, starch dense 11%, original ph 10, Na
2SiO
3Consumption 1.8%, MgSO
4Consumption 0.12%;
P2 section: H
2O
2Consumption 1.8%, bleaching time 65min; 95 ℃ of temperature, starch dense 11%, original ph 10, EDTA consumption 0.35%, Na
2SiO
3Consumption 1.8%, MgSO
4Consumption 0.12%;
The mensuration of whiteness: the paper pulp after will bleaching disperses, and moulding in Buchner funnel under swabbing action then is clipped in the middle pressing of filter paper, and it is 65.7%ISO that whiteness is measured with whiteness instrument (YQ-Z-48B) in air-dry back.
Claims (5)
1. Yellow willow alkaline hydrogen peroxide pulp making method is characterized in that may further comprise the steps:
(1) raw material is prepared
Yellow willow matter fibrous raw material is allowanced for bark and the shredder fragmentation with the machine of allowancing for bark, and raw material does not have the branch crust and do not have whole stalk, vivid turning white, and no mildew, free from admixture, no dust after drying, are measured raw material moisture, and is standby;
(2) pulping process
Over dry raw material wood chip 100g reacts with cooking liquor in reactor, and keeping liquor ratio is 5: 1～4: 1, and the heating-up time is 2～3h; The boiling parameter be 16～20% NaOH, maximum temperature be 165～175 ℃, 2～4% hydrogen peroxide and under maximum temperature temperature retention time 60～120min, select paper pulp yield, Kappa number and pulp viscosity to characterize the character of alkaline hydrogen peroxide paper pulp; After boiling finishes, reactor is taken out, cool off with flowing water rapidly, to be cooled to 22～30 ℃, paper pulp is separated with waste liquid, pulp washing is clean, with the sieve seam is the plansifter screening of 0.15～0.25mm, and the slag that sifts out slurry is dried to weight in 100～105 ℃ of baking ovens, calculate the yield of slag slurry; Screened stock is collected in the cloth bag, removes part moisture with seperator, and the concentration that makes slurry is 30%, weigh, be kept at then in the plastic bag, place in the refrigerator, Kappa number and pulp viscosity are measured according to national standard method GB/T 1546-1989 and GB/T1548-1989 respectively;
(3) pulp property detects
With the making beating of PFI mill, starch dense 9～12%, beater roll(er) and beater chamber gap are 0.2mm, the beating degree of control paper pulp is 43～46 ° of SR, on standard paper industry former, copy and get the scraps of paper, adopt national standard method GB/T 453-1989, GB/T 455.1-1989, GB/T 454-1989 to measure physical properties of pulp respectively;
(4) paper pulp bleaching process
The yellow willow shrub alkaline hydrogen peroxide slurry employing HP or the PP that obtain bleach, and the mensuration of bleaching back whiteness: the paper pulp after will bleaching disperses, and moulding in Buchner funnel under swabbing action then is clipped in the middle pressing of filter paper, and whiteness is measured with the whiteness instrument in air-dry back.
2. Yellow willow alkaline hydrogen peroxide pulp making method according to claim 1 is characterized in that described reactor is the 1000ml stainless steel reactor.
3. Yellow willow alkaline hydrogen peroxide pulp making method according to claim 1 and 2 is characterized in that the HP bleaching conditions that is adopted is as follows:
The H section: chlorine dosage 5～6%, bleaching time 90～100min, pH value 11～12,35～40 ℃ of temperature are starched densely 6～7%, and endpoint pH is not less than 8;
P section: H
2O
2Consumption 1～1.5%, bleaching time 60～70min; EDTA consumption 0.4～0.5%, 70～80 ℃ of temperature, starch dense 8～11%, original ph 10～12, Na
2SiO
3Consumption 1.5～2%, MgSO
4Consumption 0.1～0.15%.
4. Yellow willow alkaline hydrogen peroxide pulp making method according to claim 1 and 2 is characterized in that the PP bleaching conditions that is adopted is as follows:
P1 section: H
2O
2Consumption 1～1.5%, bleaching time 50～60min; EDTA consumption 0.3～0.4%, 80～90 ℃ of temperature, starch dense 10～12%, original ph 10～12, Na
2SiO
3Consumption 1.5～2%, MgSO
4Consumption 0.1～0.15%;
P2 section: H
2O
2Consumption 1.5～2%, bleaching time 60～70min; 90～100 ℃ of temperature, starch dense 10～12%, original ph 10～12, EDTA consumption 0.3～0.4%, Na
2SiO
3Consumption 1.5～2%, MgSO
4Consumption 0.1～0.15%.
5. according to each described Yellow willow alkaline hydrogen peroxide pulp making method of claim 1-4, the model that it is characterized in that described whiteness instrument is YQ-Z-48B.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031713A (en) * | 2010-10-02 | 2011-04-27 | 山东海龙股份有限公司 | Preparation method of sunflower seed husk pulp |
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2005
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031713A (en) * | 2010-10-02 | 2011-04-27 | 山东海龙股份有限公司 | Preparation method of sunflower seed husk pulp |
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