CN104345126A - Method for quickly evaluating unik sulfate pulping technology - Google Patents
Method for quickly evaluating unik sulfate pulping technology Download PDFInfo
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- CN104345126A CN104345126A CN201410488787.0A CN201410488787A CN104345126A CN 104345126 A CN104345126 A CN 104345126A CN 201410488787 A CN201410488787 A CN 201410488787A CN 104345126 A CN104345126 A CN 104345126A
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000004537 pulping Methods 0.000 title claims abstract description 22
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims abstract description 14
- 238000005516 engineering process Methods 0.000 title abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 36
- 229920005610 lignin Polymers 0.000 claims abstract description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims abstract description 7
- 239000002023 wood Substances 0.000 claims description 50
- 238000010411 cooking Methods 0.000 claims description 15
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 11
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 11
- 241001330002 Bambuseae Species 0.000 claims description 11
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 11
- 239000011425 bamboo Substances 0.000 claims description 11
- 238000011156 evaluation Methods 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- 238000003556 assay Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000002655 kraft paper Substances 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 4
- 239000008399 tap water Substances 0.000 claims description 4
- 235000020679 tap water Nutrition 0.000 claims description 4
- 229920001131 Pulp (paper) Polymers 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 13
- 238000009835 boiling Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 238000004061 bleaching Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000029087 digestion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000010893 paper waste Substances 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 241001164374 Calyx Species 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- ODLMAHJVESYWTB-UHFFFAOYSA-N propylbenzene Chemical compound CCCC1=CC=CC=C1 ODLMAHJVESYWTB-UHFFFAOYSA-N 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910021653 sulphate ion Inorganic materials 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 241000131317 Capitulum Species 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241001573881 Corolla Species 0.000 description 1
- 102000002322 Egg Proteins Human genes 0.000 description 1
- 108010000912 Egg Proteins Proteins 0.000 description 1
- 244000283207 Indigofera tinctoria Species 0.000 description 1
- 241001597008 Nomeidae Species 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 210000001672 ovary Anatomy 0.000 description 1
- 210000004681 ovum Anatomy 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
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Abstract
The invention provides a method for quickly evaluating the quality of a unik sulfate pulping technology. The method comprises the following steps: (a) measuring the lignin content X (%) of a unik raw material; (b) stewing by adopting a sulfate method to prepare unik pulp, wherein the alkali amount Y (%) is metered by NaOH; (c) measuring the alkali residue content A (%) of stewing waste liquid and the kappa value K of the pulp; (d) calculating the quality of the unik sulfate pulping technology according to the following formula, if K is smaller than or equal to Z1=X*29.9+Y*55.1 and A is smaller than or equal to Z2=X*0.13+Y*0.27, judging that the technology is qualified, otherwise, judging that the technology is disqualified. The method is simple, high in efficiency, high in practicability and suitable for being popularized, and a novel method is provided for quickly adjusting a unik sulfate pulp stewing technology.
Description
Technical field
The invention belongs to pulping and paper-making field, relate to the method for a kind of Fast Evaluation principal columns of a hall wood sulfate pulping technique.
Background technology
Paper-making industrial waste water is one of industrial pollution source, probably accounts for about 10% of the total wastewater flow rate of China's industry.Pulp and paper industry waste water mainly contains high concentrated organic wastewater, also containing pollutants such as lignin, sulfide, chlorides.The maximum feature of paper-making industrial waste water is that wastewater flow rate is large, and COD mass concentration is high, but along with the increasing of paper industry environmental protection dynamics, the pollution of paper waste reduces year by year, and in paper industry waste water in 2010, total generation of COD is at about 95.2 ten thousand tons; The pollution condition otherness of dissimilar papermaking enterprise discharge is large, and different starting material, different papermakings, in its waste discharge, the concentration of COD has the difference of several times to tens times.Therefore, reduce paper waste pollute and discharge capacity extremely urgent.
Paper waste mainly contains two sources, and one is cooking waste liquor, because can produce a large amount of colorful wastewaters in the boiling stage, wherein lignin and derivant thereof are main pollutant components; Two is bleachings, and the bleaching liquor of bleaching is mostly containing chlorine element, and can produce noxious material and carcinogen like this, as bioxin, these objectionable impuritiess all can affect the healthy of people.Along with improving constantly of people's environmental consciousness, people start the environment paying close attention to periphery, solve current environmental problem be heavy among.The environmental requirement of country is also more and more tighter, more and more higher to emission standard, and in " 12 " period, chemical oxygen demand (COD) (COD) total emission volumn is estimated to reduce 10-12% in 2015 than 2010 years.Therefore, find non-wood material cleaning pulping new technology, reducing the pollution to environment, is one of important topic research of enterprises in pulp and paper industry.
Current, principal columns of a hall wood is becoming a kind of more and more important fibre resources, particularly in field of papermaking.Principal columns of a hall wood deciduous tree, up to 30 meters; Sprig is by yellow pubescence.Stipule is large, film quality, and heart-shaped, tip has small cusp, caducous.Two times winglike compound leaves, accessory pinna 6-12 couple; Common petiole base portion and rachis there is body of gland; Leaflet 20-35(40) right, stockless, oblong, long 6-10 millimeter, wide 2-3 millimeter, tip is gradually sharp, and base portion is closely truncated, tool echinid, below villosity; Middle arteries and veins is near coboundary.Capitulum has colored 10-20 piece, is born on length difference, close pubescent total bennet, then lines up the raw panicle in top; Spend green white or faint yellow, close by tawny pubescence; Calyx funnel-form, is about 3 millimeters, has 5 short teeth; Corolla is about 2 times into calyx, sliver ovum shape triangle; Stamen is about 25 millimeters; Ovary is by tawny pubescence.Pod is flat, long 10-15 centimetre, and wide about 2 lis are come, slightly by pubescence during children, without hair time ripe.The florescence 3-5 month; The fruit phase 6-12 month.
Principal columns of a hall wood is a kind of main Papermaking Resource, and traditional principal columns of a hall wood adopts alkaline process chemical pulping more, because the more Pulp Drainage Properties that makes of heteroproteose cell in principal columns of a hall wood raw material is poor, the extraction ratio of black liquor is low, and silicone content is higher, bring difficulty to alkali collection part, cause the pollution of environment.Along with paper industry faces becoming increasingly conspicuous of paper making raw material, the energy and environmental problem contradiction, studying the pulping process made new advances is inevitable choice, plays significant role to the development of paper industry.
But, the current evaluation to pulping process quality is mainly as the criterion with the physical property of the paper of finally manufacturing paper with pulp, grope in process in actual process, first slurry after boiling wants equilibrium moisture 24h, to manufacture paper with pulp again paper, physical properties index could be detected, whole process need more than 3 days after the paper equilibrium moisture 24h obtained.In large-scale single factor test and orthogonal experiment process, whole sense cycle is long, cannot adjust pulping process timely and effectively, causes the paper produced to occur defective problem continuously, makes enterprise suffer tremendous economic loss.
Summary of the invention
Object of the present invention is just the above-mentioned deficiency overcoming prior art, the method of a kind of Fast Evaluation principal columns of a hall wood sulfate pulping technique is provided, lignin content, alkali charge, residual alkali, Kappa number are introduced in deliberated index by the present invention, introduce a kind of method of residual alkali and Kappa number Fast Evaluation pulping process quality.Thus the production technology of slurry can be adjusted in time, for the selection optimization of optimum boiling provides foundation.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
The invention provides the method for a kind of Fast Evaluation principal columns of a hall wood sulfate pulping technique quality, comprise the steps:
A) the lignin content X (%) of principal columns of a hall wood raw material is measured;
B) adopt kraft cooking, prepare principal columns of a hall wood pulp, alkali charge Y(%) in NaOH;
C) measure cooking waste liquor residual alkali content A(%), the Kappa number K of slurry;
D) according to following formula, the quality of principal columns of a hall wood sulfate pulping technique is calculated, if K≤Z
1=X × 29.9+Y × 55.1, A≤Z
2=X × 0.13+Y × 0.27, then it is qualified to be judged to be, otherwise is judged to be defective.Lignin is the natural polymer be made up of phenylpropane monomer, when producing chemical pulp, remove the lignin of in raw material more than 80%; Lignin content is the essential condition formulating reasonable boiling and bleaching process, and lignin massfraction is high, and boiling difficulty, the chemicals of consumption is also relatively many.
Principal columns of a hall wood raw material described in step a) through washing, squeezing, air-dry, section after, be whittled into matchstick size and leave equilibrium moisture 24 more than h in polymeric seal bag in.
Lignin content described in step a) is pressed GB/T2677.8-1994 and is measured.
The step of washing described in step a) be principal columns of a hall wood first through tap water repeatedly, a small amount of white powder and dust and dirt being attached to principal columns of a hall wood surface is washed away.Prevent the metal on its surface and other compositions from causing adverse effect to follow-up slurrying and bleaching process.
The step of squeezing described in step a) is principal columns of a hall wood is struck with axe the strip being cleaved into wide about 4 ~ 5cm length, is then squeezed through squeezer by principal columns of a hall batten, removes the air in lumen and filtrate partly.After squeezing, principal columns of a hall timber forms the striped of radial trend on surface, is easy to permeate cooking liquor equably in digestion process, the speed that quickening timber and cooking liquor react.
Step air-dry described in step a) is that the principal columns of a hall batten after washing, squeezing is tanned by the sun 3 ~ 7 days, even moisture, when the moisture of principal columns of a hall wood reaches about 10 %;
The step of cutting into slices described in step a) be squeezing air-dry after the principal columns of a hall batten microtome bamboo cane is cut into long 2 ~ 3cm, wide be the principal columns of a hall wood chip of 1 ~ 1.5cm, finally pack sealing, equilibrium moisture is for subsequent use.
Residual alkali content described in step c) measures by the assay method of black liquor effective alkali in " pulping and paper-making analysis and detection ".
Step c) Kappa number is pressed GB/T 1546-1989 and is measured
Beneficial effect of the present invention:
1. lignin content, alkali charge, residual alkali, Kappa number are introduced in deliberated index by the present invention, introduce a kind of method of residual alkali and Kappa number Fast Evaluation pulping process quality.Thus the production technology of slurry can be adjusted in time, for the selection optimization of optimum boiling provides foundation.
2. method is simply efficient, practical, suitable popularization, for rapid adjustment principal columns of a hall wood Kraft cook technique provides a kind of new method.
Embodiment
Mode by the following examples further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.The experimental technique of unreceipted actual conditions in the following example, conventionally selects with condition.
embodiment 1 blbizzia falcata sulphate cook technology assessment
1. the preparation of principal columns of a hall wood chip
Material preparation step:
(1) wash: principal columns of a hall wood first through tap water repeatedly, washes away a small amount of white powder and dust and dirt being attached to principal columns of a hall wood surface, prevents the metal on its surface and other compositions from causing adverse effect to follow-up slurrying and bleaching process;
(2) squeeze: with axe, principal columns of a hall wood is struck the strip being cleaved into wide about 4 ~ 5cm length, then bamboo cane is squeezed through squeezer, remove the air in lumen and bamboo filtrate partly.After squeezing, principal columns of a hall wood forms the striped of radial trend on surface, is easy to permeate cooking liquor equably in digestion process, the speed that quickening principal columns of a hall timber and cooking liquor react.
(3) air-dry: above-mentioned principal columns of a hall batten to be tanned by the sun 3 ~ 7 days, even moisture, when the moisture of principal columns of a hall wood reaches about 10 %;
(4) cut into slices: with microtome principal columns of a hall batten is cut into long 2 ~ 3cm, wide be the bamboo chip of 1 ~ 1.5cm, finally pack sealing, equilibrium moisture is for subsequent use.
2. the preparation of principal columns of a hall wood powder
The above-mentioned principal columns of a hall wood chip prepared is whittled into matchstick size deposits bag equilibrium moisture 24 more than h together with bamboo chip, laggard row filter is pulverized through comminutor, intercepted the principal columns of a hall wood powder of 40 orders (0.38 mm sieve aperture) to 60 orders (0.25 mm sieve aperture), deposit in the good polyethylene plastic bag of sealing, after equilibrium moisture, carry out composition measurement.
3. the chemical constituents determination of principal columns of a hall wood
The chemical composition composition of principal columns of a hall wood measures according to national standard:
Klason lignin assay is see GB/T2677.8-1994.
The lignin content recording principal columns of a hall timber is 21.6%.
4. Kraft cook test
Cooking test carries out in 15 L swinging electric steamers.
Process conditions: alkali charge 24%(is in NaOH), sulphidity 25%;
Boiling curve: dally 5 minutes after dress pot, be once warming up to 140 DEG C, heating-up time 120min, carry out little venting 1 minute; Secondary temperature elevation, to maximum temperature 160 DEG C, continues insulation 60 ~ 90min.
5. the mensuration of residual alkali and Kappa number
Residual alkali measures by the assay method of black liquor effective alkali in " pulping and paper-making analysis and detection "
Kappa number is pressed GB/T 1546-1989 and is measured.
Thick slurry after boiling, after wash engine washing and screening, dries with hydro-extractor, tears up, even moisture, measures unscreened yield and Kappa number.The Kappa number of brown stock is 18.4; After the static process of cooking waste liquor, measure residual alkali, residual alkali content is 9.2%.
6. the judgement of digesting technoloy quality
Z
1= X×29.9+Y×55.1=19.6>18.4，Z
2= X×0.13+Y×0.27 =9.3%>9.2%,
Result shows: the lignin degradation efficiency of this digesting technoloy is higher, lower than predicted value by 1.2, decomposes most lignin, and effective alkali consumption is reasonable simultaneously, and residual alkali content is 9.2%, shows that alkali lye and lignin fully react.
embodiment 2 indigo plant flower principal columns of a hall sulphate cook technology assessment
1. the preparation of principal columns of a hall wood chip
Material preparation step:
(1) wash: principal columns of a hall wood first through tap water repeatedly, washes away a small amount of white powder and dust and dirt being attached to principal columns of a hall wood surface, prevents the metal on its surface and other compositions from causing adverse effect to follow-up slurrying and bleaching process;
(2) squeeze: with axe, principal columns of a hall wood is struck the strip being cleaved into wide about 4 ~ 5cm length, then bamboo cane is squeezed through squeezer, remove the air in lumen and bamboo filtrate partly.After squeezing, principal columns of a hall wood forms the striped of radial trend on surface, is easy to permeate cooking liquor equably in digestion process, the speed that quickening principal columns of a hall timber and cooking liquor react.
(3) air-dry: above-mentioned principal columns of a hall batten to be tanned by the sun 3 ~ 7 days, even moisture, when the moisture of principal columns of a hall wood reaches about 10 %;
(4) cut into slices: with microtome principal columns of a hall batten is cut into long 2 ~ 3cm, wide be the bamboo chip of 1 ~ 1.5cm, finally pack sealing, equilibrium moisture is for subsequent use.
2. the preparation of principal columns of a hall wood powder
The above-mentioned principal columns of a hall wood chip prepared is whittled into matchstick size deposits bag equilibrium moisture 24 more than h together with bamboo chip, laggard row filter is pulverized through comminutor, intercepted the principal columns of a hall wood powder of 40 orders (0.38 mm sieve aperture) to 60 orders (0.25 mm sieve aperture), deposit in the good polyethylene plastic bag of sealing, after equilibrium moisture, carry out composition measurement.
3. the chemical constituents determination of principal columns of a hall wood
The chemical composition composition of principal columns of a hall wood measures according to national standard:
Klason lignin assay is see GB/T2677.8-1994.
The lignin content recording principal columns of a hall timber is 23.1%.
4. Kraft cook test
Cooking test carries out in 15 L swinging electric steamers.
Process conditions: alkali charge 26%(is in NaOH), sulphidity 25%;
Boiling curve: dally 5 minutes after dress pot, be once warming up to 140 DEG C, heating-up time 120min, carry out little venting 1 minute; Secondary temperature elevation, to maximum temperature 160 DEG C, continues insulation 60 ~ 90min.
5. the mensuration of residual alkali and Kappa number
Residual alkali measures by the assay method of black liquor effective alkali in " pulping and paper-making analysis and detection "
Kappa number is pressed GB/T 1546-1989 and is measured.
Thick slurry after boiling, after wash engine washing and screening, dries with hydro-extractor, tears up, even moisture, measures unscreened yield and Kappa number.The Kappa number of brown stock is 20.9; After the static process of cooking waste liquor, measure residual alkali, residual alkali content is 10.8%.
6. the judgement of digesting technoloy quality
Z
1= X×29.9+Y×55.1=21.2>20.9，Z
2= X×0.13+Y×0.27 =10%<10.8%,
Result shows: the lignin degradation efficiency of this digesting technoloy is higher, lower than predicted value by 0.3, shows that lignin is deviate from completely substantially, residual alkali content is 10.8%, is greater than predicted value, shows that alkali charge is too high, there is part alkali lye not participate in reaction, suitably should reduce alkali charge, reduce chemical consumption cost-saving.
Although above-mentioned, the specific embodiment of the present invention is described; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (9)
1. a method for Fast Evaluation principal columns of a hall wood sulfate pulping technique quality, is characterized in that, comprise the steps:
A) the lignin content X (%) of principal columns of a hall wood raw material is measured;
B) adopt kraft cooking, prepare principal columns of a hall wood pulp, alkali charge Y(%) in NaOH;
C) measure cooking waste liquor residual alkali content A(%), the Kappa number K of slurry;
D) according to following formula, the quality of principal columns of a hall wood sulfate pulping technique is calculated, if if K≤Z
1=X × 29.9+Y × 55.1, A≤Z
2=X × 0.13+Y × 0.27, then it is qualified to be judged to be, otherwise is judged to be defective.
2. method according to claim 1, is characterized in that, the principal columns of a hall wood raw material described in step a) through washing, squeezing, air-dry, section after, be whittled into matchstick size and leave equilibrium moisture 24 more than h in polymeric seal bag in.
3. method according to claim 1, is characterized in that, lignin content described in step a) is pressed GB/T2677.8-1994 and measured.
4. method according to claim 2, is characterized in that, the step of washing described in step a) be principal columns of a hall wood first through tap water repeatedly, a small amount of white powder and dust and dirt being attached to principal columns of a hall wood surface is washed away.
5. method according to claim 2, is characterized in that, the step of squeezing described in step a) is principal columns of a hall wood is struck with axe the strip being cleaved into wide about 4 ~ 5cm length, is then squeezed through squeezer by principal columns of a hall batten, removes the air in lumen and bamboo filtrate partly.
6. method according to claim 2, is characterized in that, step air-dry described in step a) is that the principal columns of a hall batten after washing, squeezing is tanned by the sun 3 ~ 7 days, even moisture, when the moisture of principal columns of a hall wood reaches about 10 %.
7. method according to claim 2, is characterized in that, the step of cutting into slices described in step a) be squeezing air-dry after the principal columns of a hall batten microtome bamboo cane is cut into long 2 ~ 3cm, wide be the principal columns of a hall wood chip of 1 ~ 1.5cm, finally pack sealing, equilibrium moisture is for subsequent use.
8. method according to claim 1, is characterized in that, residual alkali content described in step c) measures by the assay method of black liquor effective alkali in " pulping and paper-making analysis and detection ".
9. method according to claim 1, is characterized in that, step c) Kappa number is pressed GB/T 1546-1989 and measured.
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|---|---|---|---|---|
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| CN103321080A (en) * | 2013-07-17 | 2013-09-25 | 齐鲁工业大学 | ECF bleaching technology of fast growing poplar by sulfate pulp bio-chemical method |
| CN103459711A (en) * | 2011-03-22 | 2013-12-18 | 安德里兹公司 | Method and arrangement for treating filtrate after oxygen delignification of chemical pulp cooked to a high kappa number |
| CN104032607A (en) * | 2014-05-26 | 2014-09-10 | 中国中轻国际工程有限公司 | High-yield natural-color wood pulp production method |
-
2014
- 2014-09-23 CN CN201410488787.0A patent/CN104345126B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0442806A1 (en) * | 1990-02-12 | 1991-08-21 | Sappi Limited | A process for producing pulp from a lignocellulosic-containing material |
| US20020088573A1 (en) * | 2000-02-09 | 2002-07-11 | Bryant Patrick S. | Pulping process |
| JP2005256224A (en) * | 2004-03-12 | 2005-09-22 | Daio Paper Corp | Method of digestion using columnar vessel type continuous digester |
| JP2006274478A (en) * | 2005-03-29 | 2006-10-12 | Mitsubishi Paper Mills Ltd | Papermaking chemical pulp having improved discoloration property |
| CN103459711A (en) * | 2011-03-22 | 2013-12-18 | 安德里兹公司 | Method and arrangement for treating filtrate after oxygen delignification of chemical pulp cooked to a high kappa number |
| CN102345241A (en) * | 2011-09-26 | 2012-02-08 | 山东轻工业学院 | Bleaching process of coniferous wood and deciduous wood mixed chemical pulp stewed by sulfate process |
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