CN1271280C - Method for producing chemical wood pulp - Google Patents
Method for producing chemical wood pulp Download PDFInfo
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- CN1271280C CN1271280C CN 200410023742 CN200410023742A CN1271280C CN 1271280 C CN1271280 C CN 1271280C CN 200410023742 CN200410023742 CN 200410023742 CN 200410023742 A CN200410023742 A CN 200410023742A CN 1271280 C CN1271280 C CN 1271280C
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Abstract
The present invention relates to a method for chemically producing wood pulp, which comprises the following steps: (1) the immersion is carried out, wood chips for making pulp and immersion liquid are added to a container, the immersion temperature is from 50 to 98 DEG C, the immersion time is from 15 to 50 min, and the immersion liquid uses partial or all cooking liquid; (2) the extrusion and the pressing are carried out, the immersed wood chips are extruded and pressed by extrusion equipment, and the compression ratio is 3 to 6:1; (3) lignin is removed, the extruded wood chips, the waste immersion liquid and the cooking liquid are added to a cooker together, and are cooked, and the lignin is removed. The method for chemically producing wood pulp can reduce alkali amount or cooking time, the steam consumption is reduced, the energy consumption for beating pulp is reduced, and the unit equipment production capability is improved. The fiber raw materials, such as tree sections and the like are fully utilized, the boiled liquid medicine is evenly permeated, the pulp making yield and the cooking uniformity can be enhanced, and the slag screening rate is reduced.
Description
(1) technical field under
The present invention relates to a kind of production method of paper pulp, particularly a kind of chemical wood pulp productive method.
(2) background technology
Pulping and paper-making is fund, the energy and technology-intensive industry.According to the nineteen ninety-five statistics, global paper industry total sales volume reaches 2,600 hundred million dollars, 4,000 hundred million dollars of assets, and position in industry is only second to telecommunications industry and auto industry, and the development of industry is consistent with the growth of national economy.At present, world's paper output is more than 1.74 hundred million tons.
Timber have supply stable, concentrate, pulping intensity height, series of advantages such as the performance of manufacturing paper with pulp is good and become the main fibrous raw material of pulping and paper-making industry, world's pulping wood ratio accounts for more than 95%, and chemical wood pulp accounts for more than 65% of total wood pulp output.It is good that chemical wood pulp has intensity, becomes pulp brightness high and stable, and what become that most of paper kind, especially high-grade paper kind manufacture paper with pulp must be with slurry kind.
Chemical pulp production mainly contains alkaline process and sulphite process, and conventional production procedure is to carry out the thermophilic digestion delignification after wood chip mixes with cooking liquor in various boiling vessels.With respect to non-wood fibrous raw materials such as wheat straw, bagasses, timber is hard because of its material, and basic density is big, and there are a series of problems in conventional chemical legal system slurry:
(1) because of the wood structure densification, cooking liquor is to the infiltration of wood chip inside and the stripping difficulty of digestion process product, causes the production of wood chemistry slurry to have that the chemicals consumption is big, digestion time long and problem such as steam consumption height.In addition, cooking liquor infiltration difficulty also causes the pulp quality heterogeneity, screening reject rate height.
(2) for the very big seeds of basic density, the Eucalyptus big as the age of tree, digesting assistants such as anthraquinone are difficult to be penetrated into wood chip inside, can not play the quickening delignification reaction of digesting assistant, the effect of protection carbohydrate.
(3) the more hard burl of association in the timber, these knots need be removed in advance in boiling, as are mixed in boiling in the boiling vessel, and then soup infiltration difficulty is generally sifted out as screenings, causes a large amount of fibrous raw material wastes.In addition, the cooking section equipment investment of chemical wood pulp is bigger.
(3) summary of the invention
The present invention is in order to overcome above deficiency, a kind of new chemical wood pulp production method is provided, can strengthen the uniformly penetrating of cooking liquor and auxiliary agent, accelerate boiling delignification reaction speed, improve the homogeneity of boiling, reduce the production cost of chemical pulp significantly, and very little to the intensity index influence of paper pulp.
The present invention realizes by following measure:
Production method of the present invention may further comprise the steps,
1. flood: slurrying wood chip and maceration extract are joined in the container, and dipping temperature is 50～98 ℃, and dip time is 15～50 minutes, and maceration extract adopts part or all of cooking liquor;
2. squeezing extrusion: the wood chip after the impregnation process adopts extrusion equipment to carry out squeezing extrusion, and compression ratio is 3～6: 1;
3. delignification: the wood chip after will pushing, above-mentioned dipping waste liquid and cooking liquor join in the boiling vessel together, carry out the boiling delignification reaction.
Above-mentioned delignification cooking liquor is conventional soda pulping process cooking liquor, or the sulfite pulping cooking liquor.
During soda pulping process, alkali charge is generally 10%～24% (with Na
2O weight meter), liquor ratio 1: 2～5.
During sulphite slurrying, can be acidity, alkalescence or neutral sulfite, its concentration is conventional concentration.
Production procedure of the present invention comprises three workshop sections, i.e. dipping-squeezing extrusion-delignification, or Impregnation-Extrusion-Delignification abbreviates IED slurrying as.
Dipping: one is the softening hard leaf wood of raw material, especially material, and minimizing fiber suffered fiber in the squeezing extrusion process shortens, the adverse effects such as damage of fiber finer cell wall, reduces the influence that squeezing extrusion reduces pulping intensity as far as possible.Two is the pre-infiltration of cooking liquor, and the chemical solution that dipping adopts is a cooking liquor, can reach good infiltration at the impregnation stage cooking liquor, is the condition that the raw material delignification in boiling stage is created, and it is even to make wood chip absorb soup equally, reduces the screening reject rate.Adopt steam treatment, can get rid of the air in the wood chip, also can reach the purpose of quickening the soup infiltration of boiling stage; Three are stripping part extract and low molecular weight carbohydrate and lignin.Four, maceration extract enters the boiling stage, has avoided environmental pollution, has saved raw material, has reduced cost.Five, impregnation concentration is than the conventional maceration extract height that uses, the infiltration that has improved soup.Six, maceration extract generally uses cooking liquor part or all of, generally accounts for the major part of cooking liquor.
Squeezing extrusion: extruding makes the many be full of cracks of wood chip output, and it is loose that structure becomes, the wood chip attenuation, and bulk density diminishes, and forms the wood wool group of space network.This wood wool is rolled into a ball specific area and is become big, is easy to evenly absorb medicine, makes the corresponding quickening of delignification reaction speed, and reactant also is easy to stripping.This stage is the uniformly penetrating of strengthening cooking liquor, the key that reduces boiling chemicals consumption, minimizing digestion time and raising boiling pulping homogeneity.The squeezing extrusion in this stage, its compression ratio is bigger than general extruding, generally reaches 3～6: 1, is preferably 4: 1.
Delignification: after the processing of above two workshop sections, very big variation has taken place in the physics of wood chip and chemical property, more helps delignification reaction.Delignification workshop section carries out in conventional boiling vessel, and cooking liquor is with the dipping waste liquid or add the part chemical solution, and cooking liquor mainly comes from the dipping waste liquid.
Be example below with the poplar, according to alkaline process chemical pulp and sulphite chemistry slurry, use production method of the present invention and common process to carry out performance comparison respectively.
Test raw material is taken from the Huimin County, Shandong, the age of tree 5 years, diameter of a cross-section of a tree trunk 1.3 meters above the ground 14.3cm, wood powder whiteness 61.4%ISO, basic density 0.392g/cm
3, the fibre length weighted average length is 0.853mm.The laboratory is manual removes the peel, chips, and chip dimensions is 25mm * 20mm * 3～5mm, and qualification rate is more than 90%, and its main chemical compositions sees Table 1.
Table 1 narrow-crown poplar is deceived 11 main chemical compositions (%)
| Extract | Holocellulose | Acid-insoluble lignin | Acid soluble lignin | Poly-pentose | |||
| Cold water | Hot water | 1％NaOH | Benzene alcohol | ||||
| 2.38 | 3.77 | 21.38 | 3.58 | 80.37 | 22.60 | 3.21 | 25.83 |
1. alkaline process chemical pulp
The wood characteristics of leaf woods such as willow is the hemicellulose level height, and lignin and content of cellulose are low, the acetyl content height, and the overwhelming majority links to each other with hemicellulose.Plant fiber material the effect of NaOH solution (＜100 ℃=down; most of extract is dissolved; less lignin and the carbohydrate of molecular weight also is dissolved simultaneously; acetyl group generates sodium acetate and dissolves under the effect of alkali; on the hemicellulose structure, form hydroxyl, with water be drawn onto it around increase fibre swelling.Therefore, NaOH handles and can significantly soften timber.The research that test has been carried out reducing the boiling chemicals and reducing digestion time to the black 11IED slurrying of living narrow-crown poplar in 5 years.Dipping has been taked three kinds of modes, and one is that conventional decatize is handled; Two is the NaOH impregnation process; Three is Na
2SO
3Impregnation process, three kinds of different immersion conditions and yield are as shown in table 2.
Table 2 different impregnation process mode process conditions and result
| Impregnation method | NaOH/％ | Na 2SO 3/％ | Na 2CO 3/％ | Time/min | Yield/% | Dipping waste liquid alkali is dense/g/L |
| Decatize 14%NaOH 20%NaOH 20%Na 2SO 3 | - 14 20 - | - - - 17 | - - - 3 | 20 30 30 40 | 97.92 91.81 91.12 103.14 | - 27.44 45.52 - |
Annotate: each chemicals usage is with Na
2The O meter, liquor ratio 1: 4,95～98 ℃ of dipping temperatures.
Table 3 reduces alkali charge forensic chemistry slurry boiling result
| The wood chip state | Not extruding | Extruding | ||||
| Pulping process | Soda-AQ | KP | Soda-AQ | KP | ||
| Numbering | 11# | 12# | 21# | 22# | 23# | 24# |
| Dipping method | - | - | Decatize | 14％NaOH | 20％NaOH | Decatize |
| Alkali charge/% (Na 2The O meter) unscreened yield/% screened yield/% screening reject rate/% Kappa number viscosity mL/g | 20 49.62 48.11 1.51 20.35 927.0 | 20 49.58 48.64 0.94 17.67 1017.9 | 14 50.68 50.12 0.56 19.64 738.2 | 14 56.31 55.23 1.08 24.01 790.8 | 14 55.28 54.16 1.12 24.02 784.3 | 14 50.68 50.21 0.47 21.85 876.0 |
Annotate: conditions of cooking: 165 ℃ of maximum temperatures; Heating-up time 90min, temperature retention time 120min, liquor ratio 1: 4, Soda-AQ method AQ0.05%, KP method sulphidity 25%.
Adopt identical heating curve to carry out Soda-AQ and the boiling of KP method to decatize with the pretreated raw material of NaOH, the wood chip alkali charge that is untreated is 20%, and the total alkali charge of various dipping extruding preliminary treatment is 14%, and the boiling result is as shown in table 3.The Kappa number difference of alkali charge reduction by 6% back pulping is less, as seen pushes the surface area that preliminary treatment can significantly improve wood chip, increases the osmosis of cooking liquor, and delignification reaction speed accelerates, and this is the main cause that reduces alkali charge.Various preliminary treatment, especially alkali lye preliminary treatment can significantly improve screened yield, and the extruding preliminary treatment also can significantly reduce the screening the pulp rate, and this is the result of soup uniformly penetrating.With respect to conventional slurrying flow process, IED becomes slurry viscosity that reduction is arranged slightly.In the decatize processing procedure, therefore hot water stripping part extract and hemicellulose are compared in the preliminary treatment of alkali lye dipping, and the gained paper pulp kappa number is low slightly.
Reduce digestion time advantages such as the steam consumption of saving, raising unit digesting apparatus production capacity are arranged.The soda pulping process that reduces digestion time has been carried out experimental study, and with respect to not pushing wood chip, alkali charge is constant, and digestion time reduces to 120min by 210min.By table 3 and table 4 as can be seen, compare with conventional pulping process, the Kappa number of IED flow process gained slurry is lower, illustrates to still have the space of continuing to reduce digestion time.And the comparing of the preliminary treatment of chemicals dipping and decatize preliminary treatment gained slurry still shows Kappa number and viscosity is higher.Compare with conventional pulping process, the viscosity of IED slurrying gained slurry is still lower.
Table 4 reduces digestion time alkaline process chemical pulp boiling result
| Dipping method | Decatize | 20％NaOH | ||
| Numbering | 31# | 32# | 33# | 34# |
| Pulping process unscreened yield/% screened yield/% screening reject rate/% Kappa number viscosity mL/g | Soda-AQ 48.75 48.52 0.23 13.84 657.2 | KP 49.16 48.85 0.31 14.70 697.2 | Soda-AQ 51.30 50.98 0.42 17.29 718.1 | KP 51.85 51.47 0.38 16.84 816.0 |
Annotate: conditions of cooking is 165 ℃ of maximum temperatures, heating-up time 60min, and temperature retention time 60min, alkali charge 20% is (with Na
2The O meter), AQ0.05%, sulphidity 25%.
Physical strength performance to IED and conventional pulping process gained slurry compares.Slurry is copied 60g/m after PFI making beating 22000 is changeed
2Page carry out the physical strength Performance Detection.Because extruding is to the effect of fiber finer cell wall, IED gained slurry shows and is easy to making beating.From table 5 and table 6 as can be seen, after slurry carried out identical making beating and handle, compare with conventional pulping process, the beating degree of IED slurrying gained slurry is higher, especially the Soda-AQ slurry.
Table 5 different disposal wood chip Soda-AQ legal system caiquejee copies piece performance
| Numbering | 11# | 21# | 22# | 23# | 31# | 33# |
| Beating degree/° SR tightness/gcm -3Folding strength/(180 °) inferior fracture length/km tear index/mNm 2·g -1 | 43.9 0.577 930 7.45 7.52 | 50.9 0.563 635 7.21 6.28 | 50.0 0.578 760 7.92 7.35 | 52.0 0.568 785 7.85 7.78 | 47.2 0.574 609 7.56 6.08 | 48.5 0.570 745 7.68 7.62 |
Because of the effects such as cut-out of extruding to fiber, the strength character of IED slurrying and conventional pulping process gained slurry still has certain difference.Adopt the tear index and the folding strength of the slurry of decatize processing to reduce obviously.From table 5 and table 6 as can be seen, handle with respect to decatize, the various chemical impregnations that IED slurrying is adopted are handled has in various degree improvement to pulp strength.Wood chip produces more fiber fines under squeezing action, this can increase the combination of paper pulp fiber, adopt the making beating of identical beating energy consumption after, the difference of the fracture length of various extruding pretreating paper pulps and conventional slurrying slurry is less, even also has certain raising.Decatize ten extrusion process cause the reduction of tear index to the damage of fiber, adopt the softening wood chip of alkali lye impregnation process can significantly improve the reduction of tear index, because the improvement of fiber combination, the tear index of some IED flow process slurry even exceed conventional slurrying slurry.Compare with the decatize preliminary treatment, the folding strength of alkali lye impregnation process IED flow process slurry improves, but compares still low slightly with conventional pulping process.
Table 6 different disposal wood chip KP legal system caiquejee copies piece performance
| Numbering | 12# | 24# | 32# | 34# |
| Beating degree/° SR tightness/gcm -3Folding strength/(180 °) inferior fracture length/km tear index/mNm 2·g -1 | 44.2 0.600 970 7.79 7.48 | 46.7 0.592 735 8.17 6.43 | 46.5 0.587 650 7.64 6.23 | 45.8 0.591 786 7.51 7.65 |
2 sulphite process chemical pulps
Sulfite pulping has experienced a series of tortuous development.Initial stage owing to this method pulping yield height, paper pulp is of light color and easily float etc., and advantage is developed rapidly.Because the alkali of sulfate pulping reclaims and the development of bleaching technology, sulfite pulping entered stagnation, decline stage afterwards.The later stage seventies in last century is along with the successful Application of digesting assistants such as anthraquinone and chemicals recovery system makes sulphite slurrying that new vitality arranged again.
With respect to alkalescence and acid accumulator sulfite slurrying, the time of neutral sulfite boiling is still longer.After changing kraft cooking into the NS-AQ boiling as the Rauma factory of Finland Rauma-Repola company, digestion time is brought up to 410min by 260min, but NS-AQ becomes pulp yield high nearly 10% than sulphate cook, and whiteness height, the steam consumption are low.Na
2SO
3Mainly lignin is carried out sulfonating reaction, in the lignin molecular structure, introduce hydrophilic sulfonic group, string is played softening effect.Sulfite pulping mainly is divided into alkalescence, neutrality and acid sulfite process chemical pulp according to the difference of cooking liquor pH.Therefore the main emollescence of inquiring into sodium sulfite to plant fiber material of this test adopts neutral sodium sulfite that wood chip is handled.Because the subject matter that neutral sulfite slurrying exists is that digestion time is long, therefore just reduce digestion time research.Similar with the research of alkaline process chemical pulp, digestion time reduces by 42.9%, and promptly digestion time drops to 240min from 420min.
The NS-AQ cooking liquor adopts Na
2SO
3+ Na
2CO
3, at impregnation stage, the main and lignin of cooking liquor carries out sulfonating reaction, the sulfonic group that the lignin molecule is introduced has very strong hydrophily, can play softening effect to wood chip, and dipping process stripping component seldom, concerning poplar, its bating effect to wood chip is poor than the alkali lye bating effect.As can be seen from Table 7, this method paper pulp yield and whiteness are much higher than the Soda-AQ brown stock.Under the close situation of beating degree, the folding strength of IED neutral sulfite chemical pulp and tear index are lower than the Soda-AQ slurry.Especially tear index because of the cutting action of extruding to fiber, descends very big than the Soda-AQ slurry.And sulfite pulp residual lignin sulfonic acid is more, and its hydrophily is strong, helps the development of fibrous binding force, though therefore fibre length is shorter, fracture length is much higher than the Soda-AQ slurry.
Table 7 IED neutral sulfite and Soda-AQ method boiling result and slurry performance
| Dipping method | Decatize | 20％Na 2SO 3 | - |
| Numbering | 41# | 42# | 11# |
| Cooking liquor is formed | Na 2SO 3+Na 2CO 3 | NaOH+AQ | |
| Alkali charge/% digester yield/% becomes pulp yield/% whiteness/%ISO beating degree/° SR tightness/gcm -3Opacity/% light scattering coefficient/m 2·kg -1Folding strength/(180 °) inferior fracture length/km tear index/mNm 2·g -1 | 20 68.97 68.13 57.1 44.5 0.601 75.7 20.02 814 8.12 6.12 | 20 68.72 67.94 57.6 43.1 0.604 75.6 19.89 845 8.59 6.31 | 20 49.62 48.11 28.9 43.9 0.577 - - 930 7.45 7.52 |
Annotate: the maximum temperature of neutral sulfite boiling is 170 ℃, heating-up time 90min, temperature retention time 150min, liquor ratio 1: 4, AQ0.1%.
In sum, the invention has the beneficial effects as follows, reduce alkali charge or digestion time, reduce the steam consumption, reduce beating energy consumption, improve unit equipment production capacity; Make full use of fibrous raw material, as burl etc.; The cooking liquor infiltration evenly can improve the homogeneity of pulping yield and boiling, reduces the screening reject rate.
(4) description of drawings
Accompanying drawing is a flow sheet of the present invention
(5) specific embodiment
Embodiment 1
The conventional Soda-AQ legal system sizing process condition of poplar is: alkali charge 20% is (with Na
2O weight meter is with respect to the over dry raw material, down together), liquor ratio 1: 4, anthraquinone 0.05%, 165 ℃ of maximum temperatures, 90 minutes heating-up times, temperature retention time 120 minutes.Slurry performance is: screened yield 48.11%, screening reject rate 1.51%, Kappa number 20.35.Changeing the back beating degree in PFI beater making beating 22000 is 43.9 ° of SR, copies into paper, and its intensity index is as follows: fracture length 7.45km, folding strength 930 times, tear index 7.52mNm
2G
-1
Adopt IED slurrying flow process to produce poplar Soda-AQ slurry.Consisting of of cooking liquor: alkali charge 14%, liquor ratio 1: 4, anthraquinone 0.05%.Dipping workshop section adopt cooking liquor 90 ℃, handled 30 minutes.Dipping is after the screw extruder squeezing extrusion, and compression ratio is 4: 1.Add the dipping waste liquid of dipping workshop section behind the squeezing extrusion, send into digester and carry out delignification.Delignification workshop section process conditions are: 165 ℃ of maximum temperatures, and 90 minutes heating-up times, temperature retention time 120 minutes is identical with conventional slurrying heating curve.Slurry performance is: screened yield 52.14%, screening reject rate 0.47%, Kappa number 22.07.Changeing the back beating degree in PFI beater making beating 17500 is 45.1 ° of SR, copies into paper, and its intensity index is as follows: fracture length 7.92km, folding strength 810 times, tear index 7.38mNm
2G
-1With respect to the production procedure of conventional chemical slurry, under the situation that obtains similar mass paper pulp, the NaOH consumption of IED slurrying reduces by 30%, and screened yield is high by 4.03%, and the screening reject rate reduces by 1.04%, and beating energy consumption reduces by 20.5%, and the homogeneity of pulping be improved significantly.
Dipping adopts the IED slurrying flow process of hot water treatment to produce poplar Soda-AQ slurry.Dipping workshop section condition is: 98 ℃ of Hot water immersion 50 minutes, liquor ratio is 1: 4.Dipping is after the two roll press squeezing extrusion, and compression ratio is 5: 1.Add dipping waste liquid and boiling chemicals behind the squeezing extrusion, send into digester and carry out delignification.Delignification workshop section process conditions are: alkali charge 20%, liquor ratio 1: 4, anthraquinone 0.05%, 165 ℃ of maximum temperatures, 60 minutes heating-up times, temperature retention time 60 minutes.Slurry performance is: screened yield 51.21%, screening reject rate 0.35%, Kappa number 18.35.Changeing the back beating degree in PFI beater making beating 17000 is 45.5 ° of SR, copies into paper, and its intensity index is as follows: fracture length 7.12km, folding strength 752 times, tear index 6.87mNm
2G
-1With respect to the production procedure of conventional chemical slurry, IED slurrying high temperature delignification workshop section's time shortens 42.9%, and screened yield is high by 3.10%, and the screening reject rate reduces by 1.16%, and beating energy consumption reduces by 22.7%, and steam consumption reduces by 25%.
Embodiment 2
The conventional KP legal system sizing process condition of poplar is: alkali charge 20%, sulphidity are 25%, liquor ratio 1: 4,165 ℃ of maximum temperatures, 90 minutes heating-up times, temperature retention time 120 minutes.Slurry performance is: screened yield 48.64%, screening reject rate 0.94%, Kappa number 17.67.Changeing the back beating degree in PFI beater making beating 22000 is 44.2 ° of SR, copies into paper, and its intensity index is as follows: fracture length 7.79km, folding strength 970 times, tear index 7.48mNm
2G
-1
Adopt IED slurrying flow process production Aspen KP slurry.Consisting of of cooking liquor: alkali charge 20%, sulphidity 25%, liquor ratio 1: 2 is identical with the boiling chemicals usage of conventional slurrying.Dipping workshop section adopt cooking liquor 70 ℃, handled 15 minutes.Dipping is after the screw extruder squeezing extrusion, and compression ratio is 3: 1.Add dipping workshop section waste liquid behind the squeezing extrusion, send into digester and carry out delignification.Delignification workshop section process conditions are: 165 ℃ of maximum temperatures, 60 minutes heating-up times, temperature retention time 60 minutes.Slurry performance is: screened yield 51.52%, screening reject rate 0.32%, Kappa number 16.85.Changeing the back beating degree in PFI beater making beating 17000 is 45.6 ° of SR, copies into paper, and its intensity index is as follows: fracture length 7.51km, folding strength 830 times, tear index 7.41mNm
2G
-1With respect to the production procedure of conventional chemical slurry, IED slurrying high temperature delignification workshop section's time shortens 42.9%, and promptly unit boiling vessel production capacity improves 75%, screened yield is high by 2.88%, the screening reject rate reduces by 0.62%, and beating energy consumption reduces by 22.7%, and steam consumption reduces by 35%.
Embodiment 3
The conventional NS-AQ legal system sizing process condition of poplar is; Alkali charge 20%, alkali be than 0.85, liquor ratio 1: 4, anthraquinone 0.1%, 170 ℃ of maximum temperatures, 90 minutes heating-up times, temperature retention time 330 minutes.Slurry performance is: screened yield 64.21%, screening reject rate 2.04%, Kappa number 29.12.Changeing the back beating degree in PFI beater making beating 18000 is 44.8 ° of SR, copies into paper, and its intensity index is as follows: fracture length 8.21km, folding strength 921 times, tear index 7.68mNm
2G
-1
Adopt IED slurrying flow process to produce poplar NS-AQ slurry.Consisting of of cooking liquor: alkali charge 20%, alkali be than 0.85, liquor ratio 1: 4.5, anthraquinone 0.1% is identical with conventional pulping and digesting chemicals usage.Dipping workshop section adopt cooking liquor 85 ℃, handled 30 minutes.Dipping is after spiral shredder squeezing extrusion, and compression ratio is 4: 1.Add dipping workshop section waste liquid behind the squeezing extrusion, send into digester and carry out delignification, delignification workshop section process conditions are: 170 ℃ of maximum temperatures, 90 minutes heating-up times, temperature retention time 180 minutes.Slurry performance is: screened yield 66.87%, screening reject rate 0.67%, Kappa number 28.74.Changeing the back beating degree in PFI beater making beating 15000 is 45.3 ° of SR, copies into paper, and its intensity index is as follows: fracture length 8.31km, folding strength 860 times, tear index 7.41mNm
2G
-1With respect to conventional production procedure, IED slurrying high temperature delignification workshop section's time shortens 35.7%, and promptly unit boiling vessel production capacity improves 56%, and screened yield is high by 2.66%, and the screening reject rate reduces by 1.37%, and beating energy consumption reduces by 16.7%, and steam consumption reduces by 20%.
Embodiment 4
The conventional Soda-AQ legal system of the poplar wood chip slurry condition that contains knot is: alkali charge 20%, liquor ratio 1: 4, anthraquinone 0.05%, 165 ℃ of maximum temperatures, 90 minutes heating-up times, temperature retention time 120 minutes.Slurry performance is: screened yield 47.94%, and screening reject is thicker, and not pulping bulk burl is arranged, and the screening reject rate is up to 4.12%, Kappa number 22.31.Changeing the back beating degree in PFI beater making beating 22000 is 44.9 ° of SR, copies into paper, and its intensity index is as follows: fracture length 7.22km, folding strength 920 times, tear index 7.32mNm
2G
-1
Adopt IED slurrying flow process to produce and contain knot poplar wood chip Soda-AQ slurry.Consisting of of cooking liquor: alkali charge 14%, liquor ratio 1: 3.5, anthraquinone 0.05%.Dipping workshop section adopt cooking liquor 75 ℃, handled 20 minutes.Dipping is after the screw extruder squeezing extrusion, and compression ratio is 5: 1.Add dipping workshop section waste liquid behind the squeezing extrusion, send into digester and carry out delignification, delignification workshop section process conditions are: 165 ℃ of maximum temperatures, and 90 minutes heating-up times, temperature retention time 120 minutes is identical with conventional pulping process heating curve.Slurry performance is: screened yield 51.86%, screening reject are very tiny, and the screening reject rate only is 0.45%, Kappa number 21.47.Changeing the back beating degree in PFI beater making beating 18000 is 46.2 ° of SR, copies into paper, and its intensity index is as follows: fracture length 7.45km, folding strength 860 times, tear index 7.05mNm
2G
-1With respect to the production procedure of conventional chemical slurry, the boiling chemicals usage of IED slurrying reduces by 30%, and screened yield is high by 3.92%, the screening reject situation be improved significantly, the screening reject rate reduces by 3.67%, beating energy consumption reduces by 18.2%.
Embodiment 5
The conventional Soda-AQ legal system sizing process condition of fevergum is: alkali charge 17%, liquor ratio 1: 4, anthraquinone 0.05%, 165 ℃ of maximum temperatures, 90 minutes heating-up times, temperature retention time 120 minutes.Slurry performance is: screened yield 51.04%, screening reject rate 1.85%, Kappa number 21.35.Changeing the back beating degree in PFI beater making beating 25000 is 44.8 ° of SR, copies into paper, and its intensity index is as follows: fracture length 7.56km, folding strength 965 times, tear index 6.89mNm
2G
-1
Adopt IED slurrying flow process to produce fevergum Soda-AQ slurry.Consisting of of cooking liquor: alkali charge 17%, liquor ratio 1: 4, anthraquinone 0.05% is identical with conventional pulping process.Dipping workshop section adopt cooking liquor 80 ℃, handled 40 minutes.Dipping is after the two roll press squeezing extrusion, and compression ratio is 4: 1.Add dipping workshop section waste liquid behind the squeezing extrusion, send into digester and carry out delignification, delignification workshop section process conditions are: 165 ℃ of maximum temperatures, 60 minutes heating-up times, temperature retention time 70 minutes.Slurry performance is: screened yield 53.65%, screening reject rate 0.39%, Kappa number 20.34.Changeing the back beating degree in PFI beater making beating 22000 is 45.3 ° of SR, copies into paper, and its intensity index is as follows: fracture length 7.82km, folding strength 810 times, tear index 6.84mNm
2G
-1With respect to the production procedure of conventional chemical slurry, IED slurrying high temperature delignification workshop section's time shortens 38.1%, and promptly unit boiling vessel production capacity improves 61.6%, screened yield is high by 2.61%, the screening reject rate reduces by 1.46%, and beating energy consumption reduces by 12%, and steam consumption reduces by 16%.
Embodiment 6
The conventional KP legal system sizing process condition of wet-land pine tree is: alkali charge 17%, sulphidity 25%, liquor ratio 1: 4,170 ℃ of maximum temperatures, 100 minutes heating-up times, temperature retention time 150 minutes.Slurry performance is: screened yield 42.8%, screening reject rate 1.45%, Kappa number 24.78.Changeing the back beating degree in PFI beater making beating 38000 is 46.7 ° of SR, copies into paper, and its intensity index is as follows: fracture length 8.45km, folding strength 1024 times, tear index 9.68mNm
2G
-1
Adopt IED slurrying flow process to produce wet-land pine tree KP slurry.Cooking liquor consist of alkali charge 17%, sulphidity 25%, liquor ratio 1: 4, with conventional pulping and digesting liquid phase with.Dipping adopt cooking liquor 60 ℃, handled 40 minutes.Dipping is after the screw extruder squeezing extrusion, and compression ratio is 4: 1.Add dipping workshop section waste liquid behind the squeezing extrusion, send into digester and carry out delignification, delignification workshop section process conditions are: 170 ℃ of maximum temperatures, 60 minutes heating-up times, temperature retention time 80 minutes.Slurry performance is: screened yield 44.6%, screening reject rate 0.43%, Kappa number 23.14.Changeing the back beating degree in PFI beater making beating 30000 is 45.4 ° of SR, copies into paper, and its intensity index is as follows: fracture length 8.32km, folding strength 980 times, tear index 9.31mNm
2G
-1With respect to the production procedure of conventional chemical slurry, IED slurrying high temperature delignification workshop section's time shortens 44.0%, and promptly unit boiling vessel production capacity improves 78.6%, screened yield is high by 1.8%, the screening reject rate reduces by 1.02%, and beating energy consumption reduces by 21.05%, and steam consumption reduces by 22%.
Embodiment 7
Larchen conventional KP legal system sizing process condition is: alkali charge 21%, sulphidity 25%, liquor ratio 1: 4,170 ℃ of maximum temperatures, 90 minutes heating-up times, temperature retention time 150 minutes.Slurry performance is: screened yield 41.86%, screening reject rate 1.64%, Kappa number 24.68.Changeing the back beating degree in PFI beater making beating 37000 is 46.8 ° of SR, copies into paper, and its intensity index is as follows: fracture length 8.56km, folding strength 1132 times, tear index 9.74mNm
2G
-1
Adopt IED slurrying flow process to produce larch KP forensic chemistry slurry.Consisting of of cooking liquor: alkali charge 15%, sulphidity 25%, liquor ratio 1: 5.Dipping workshop section adopt cooking liquor 50 ℃, handled 50 minutes.Dipping is after the screw extruder squeezing extrusion, and compression ratio is 6: 1.Add dipping workshop section waste liquid behind the squeezing extrusion, send into digester and carry out delignification, delignification workshop section process conditions are: 170 ℃ of maximum temperatures, and 90 minutes heating-up times, temperature retention time 150 minutes is identical with conventional slurrying heating curve.Slurry performance is: screened yield 43.24%, screening reject rate 0.51%, Kappa number 24.35.Changeing the back beating degree in PFI beater making beating 29000 is 46.2 ° of SR, copies into paper, and its intensity index is as follows: fracture length 8.72km, folding strength 1011 times, tear index 9.54mNm
2G
-1With respect to the production procedure of conventional chemical slurry, IED pulping and digesting chemicals usage reduces by 28.6%, and screened yield is high by 1.38%, and the screening reject rate reduces by 1.13%, and beating energy consumption reduces by 21.6%.
Claims (6)
1. the production method of a chemical wood pulp is characterized in that: may further comprise the steps,
1. flood: slurrying wood chip and maceration extract are joined in the container, and dipping temperature is 50～98 ℃, and dip time is 15～50 minutes, and maceration extract adopts part or all of cooking liquor;
2. squeezing extrusion: the wood chip after the impregnation process adopts extrusion equipment to carry out squeezing extrusion, and compression ratio is 3～6: 1;
3. delignification: the wood chip after will pushing, above-mentioned dipping waste liquid and cooking liquor join in the boiling vessel together, carry out the boiling delignification reaction.
2. production method according to claim 1 is characterized in that: the compression ratio of wood chip squeezing extrusion is 4: 1.
3. production method according to claim 1 and 2 is characterized in that: described extrusion equipment is a screw extruder.
4. production method according to claim 1 is characterized in that: the delignification cooking liquor is a kind of of various alkaline process and sulfite pulping cooking liquor.
5. according to claim 1,2 or 4 described production methods, it is characterized in that: the alkali charge of described cooking liquor is with Na
2O weight counts 10%～24%, liquor ratio 1: 2～5.
6. production method according to claim 4 is characterized in that: described cooking liquor is a kind of for acidity, alkalescence or neutral sulfite solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410023742 CN1271280C (en) | 2004-03-16 | 2004-03-16 | Method for producing chemical wood pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410023742 CN1271280C (en) | 2004-03-16 | 2004-03-16 | Method for producing chemical wood pulp |
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| CN1563564A CN1563564A (en) | 2005-01-12 |
| CN1271280C true CN1271280C (en) | 2006-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410023742 Expired - Fee Related CN1271280C (en) | 2004-03-16 | 2004-03-16 | Method for producing chemical wood pulp |
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| CN (1) | CN1271280C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101748633B (en) * | 2008-12-19 | 2012-07-04 | 北京英力生科新材料技术有限公司 | Novel cellulose extraction process |
| CN101899794B (en) * | 2009-05-27 | 2012-07-04 | 北京英力生科新材料技术有限公司 | Green process for extracting fibers from plants |
| CN102268832B (en) * | 2011-07-15 | 2013-09-25 | 芬欧汇川(中国)有限公司 | Pulping and papermaking process for producing middle-grade and high-grade cultural paper by using larch chemical-mechanical pulp |
| CN103469696B (en) * | 2013-09-26 | 2016-02-03 | 句容市植保植检站 | A kind of brown paper and manufacture method thereof |
| CN103924471B (en) * | 2014-04-02 | 2017-07-28 | 上海同化新材料科技有限公司 | A kind of preparation of modified wood fibre element and its product |
| CN109403115B (en) * | 2018-10-22 | 2020-12-29 | 齐鲁工业大学 | Method for producing acetified-grade dissolving pulp by using poplar slabs |
| CN110512452B (en) * | 2019-08-22 | 2021-09-21 | 华南理工大学 | High-polymerization-degree wood pulp and preparation method thereof |
| CN114318918B (en) * | 2021-12-31 | 2023-05-26 | 郑州运达造纸设备有限公司 | Chemical mechanical pulp preparation process |
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| CN1563564A (en) | 2005-01-12 |
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