CN101451322A - Grass type un-bleaching pulp, preparation method and use thereof - Google Patents
Grass type un-bleaching pulp, preparation method and use thereof Download PDFInfo
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- CN101451322A CN101451322A CNA2007103002051A CN200710300205A CN101451322A CN 101451322 A CN101451322 A CN 101451322A CN A2007103002051 A CNA2007103002051 A CN A2007103002051A CN 200710300205 A CN200710300205 A CN 200710300205A CN 101451322 A CN101451322 A CN 101451322A
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- 244000025254 Cannabis sativa Species 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title claims abstract description 42
- 238000004061 bleaching Methods 0.000 title claims abstract description 14
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- 238000000034 method Methods 0.000 claims abstract description 95
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000010411 cooking Methods 0.000 claims abstract description 47
- 238000010009 beating Methods 0.000 claims abstract description 30
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- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 claims description 20
- 241000209140 Triticum Species 0.000 claims description 20
- 235000021307 Triticum Nutrition 0.000 claims description 20
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 18
- 235000014676 Phragmites communis Nutrition 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 12
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- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 claims description 11
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- 238000000465 moulding Methods 0.000 claims description 10
- 241000196324 Embryophyta Species 0.000 claims description 9
- 235000010265 sodium sulphite Nutrition 0.000 claims description 9
- 229920000742 Cotton Polymers 0.000 claims description 8
- 241001494508 Arundo donax Species 0.000 claims description 7
- 238000010025 steaming Methods 0.000 claims description 7
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- 241000609240 Ambelania acida Species 0.000 claims description 4
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- 238000005406 washing Methods 0.000 description 44
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- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical group [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 28
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- 235000011609 Pinus massoniana Nutrition 0.000 description 2
- 241000018650 Pinus massoniana Species 0.000 description 2
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Abstract
The invention discloses grass unbleached pulp and a preparation method thereof. The fracture length of the unbleached pulp is between 3.48 and 7.2km, the folding resistance is between 15 and 70 times, the tearability is between 180 and 275 mN, the whiteness is 33 to 48 percent ISO, and the beating degree is between 33 and 38 DEG SR. The unbleached pulp can be taken as pulp of corrugated paper, napkin paper and packing paper. The preparation method comprises the steps of cooking, oxygen delignification and so on, and the unbleached pulp is obtained by obtaining high-hardness pulp the hardness of which has a potassium permanganate value of between 16 and 28 and is equivalent to a Kappa number of between 24 and 50 through the cooking, and then performing oxygen delignification treatment by introducing oxygen and adding sodium hydroxide, or being matched with a pulp squeezing step and/or a disintegration step before the oxygen delignification. The use of the method can not cause the unbleached pulp to be polluted by a bleaching agent, and the strength of the pulp is protected at the same time, thereby preventing cellulose in the pulp from being degraded due to the influence of bleaching.
Description
Technical field
What the present invention relates to is brown stock, and more particularly, what relate to is a kind of grass type un-bleaching pulp, its preparation method and application thereof.
Background technology
The method of producing paper pulp with string has: chemical method, Mechanical Method, chemical mechanical pulping.In chemical method, divide lime method, soda processes, anthraquinone-soda processes, sulfate process again.
The main component of paper is cellulose and hemicellulose, as the string of paper making raw material two kinds of lumber fibre and non-wood-fibers is arranged, and their main component is cellulose, hemicellulose and lignin.Slurrying is exactly one and removes lignin as far as possible, keeps the process of cellulose and hemicellulose, and lumber fibre is the paper making raw material of high-quality, occupies very big advantage in paper industry.Along with developing rapidly of industry, the timber supply and demand conflicts, contradiction between the shortage day by day of the forest reserves and the demand of paper industry and other industrial development is remarkable day by day, and therefore, seeking non-wood-fiber paper making raw material resource is reality problem anxious to be solved again.
Grass class pulping technique is a system engineering, to study the overall process of slurrying according to the inhomogeneity of the biological structure of grass fiber raw material and the particularity of chemical composition, fibers in grass class slurrying has following characteristics: 1. heavily get the raw materials ready, silica removal, remove heteroproteose cell, improve pulp quality, improve the drainability of straw pulp, reduce the discharging of black liquor; 2. the characteristic of grass fiber delignification.Owing in the grass fiber the easy molten lignin of more alkali is arranged, its slurrying difficulty is reduced, but it asks higher delignification rate that fiber is dissociated again simultaneously, so its pulping process should be very different with timber.3. owing to silicone content height in the raw material, the carbohydrate content height causes its black liquor viscosity height, and recovery difficult is big.4. contain a large amount of heteroproteose cells in the fibers in grass class, papermaking is formed a series of harm.5. the bleachability of straw pulp is good than timber, easily adopts short flow process to bleach.
The dogstail raw material is the cheap non-wood fibrous raw material of papermaking.Because fibre length is than big, between fiber contact more, the combination that helps being interweaved can increase the evenness smoothness and the transparency of paper.There is very abundant and cheap straw resource in China, fails fully rationally to utilize.According to statistics, China produces 1.78 hundred million tons of straw per year, 0.87 hundred million ton of wheat straw, but annual 5000000 tons of the rice wheat straw quantity not sufficients that consume of papermaking now, and the bleaching rice straw pulp can be copied into general cultural paper, uses the printing that can copy better quality, writes paper with the wood pulp collocation.
There are many technical staff to be devoted to the research of this respect, such as:
2003 the 4th phases of Heilungkiang papermaking have been delivered the article that is entitled as " Optimum Condition of Rice Straw Ammonium Sulfite Pulping ", this article discloses the optimal conditions of straw Ammonium Sulfite Method boiling, but digestion time is long in the method for this boiling, the large usage quantity of ammonium sulfite, make that the energy that consumes is bigger, cost is also bigger, and prepared pulp quality is not high.
2003 the 4th phases of Heilungkiang papermaking have been delivered the article that is entitled as " characteristics of wheat straw ammonium sulfite pulping and paper-making and application ", this article discloses the method at this special plant fiber material imonium legal system paper pulp of wheat straw, the hardness of this method is low, the time of insulation is long, the temperature of insulation is higher, and the concentration ratio of remaining ammonium sulfite is higher in the black liquor, exists consumes energy bigger equally, the problem that pulp quality is not high.
Chemistry of forest product has been delivered the article that is entitled as " masson pine pulping with ammonium sulfite method " with 1981 the 4th phases of industry, this article is disclosed to be to be the prepared slurry of raw material ammonium sulfite cooking process with the masson pine, the consumption of imonium is 20-25% in this method, stewing temperature has reached 163-165 ℃, temperature retention time 5-6 hour.This method is to be raw material with trees, in today that the forest reserves lack, is that the problem of raw material papermaking is more and more outstanding with trees.
2002 the 2nd phases of periodical have been delivered the article that is entitled as " straw low-pressure low-temperature pulp-making research " during chemical industry, this article is raw material with the straw, the step of pass through pre-preg, boiling, wash sieve, bleaching has obtained bleached pulp, and the temperature retention time of this method reaches 3.5 hours, needs to consume a large amount of energy.
The above all is the boiling and the pulping process of grass feedstock production bleach chemical pulp.
Grass kind plant fiberoptic fiber raw material belongs to non-wood fibrous raw material, comprises straw, wheat straw, reed, bagasse, sorghum stalk, cornstalk, cotton stalk, giantreed etc.The forest reserves of China lack, and the main raw material that is used for papermaking is a grass as raw material.Under the serious situation that China's Forest Resources lacks day by day, how to utilize the high-quality brown stock of grass feedstock production not appear in the newspapers as yet.
Summary of the invention
One of purpose of the present invention is to provide a kind of grass type un-bleaching pulp.
Another object of the present invention is to provide a kind of preparation method of above-mentioned grass type un-bleaching pulp.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of grass type un-bleaching pulp, described brown stock are with the grass feedstock production, and the fracture length of described brown stock is 3.48-7.2km, and folding strength is 15-70 time, and tearability is 180-275mN, and whiteness is 33-48%ISO, and beating degree is 33-38 ° of SR; The fracture length of preferred described brown stock is 5.5-7.2km, and folding strength is 25-70 time, and tearability is 250-275Mn, and beating degree is 33-36 ° of SR.
The method of brown stock of the present invention comprises the step of boiling, oxygen delignification, is permanganate number 16-28 with grass material cooking to hardness, is equivalent to the high-hardness pulp of card uncle valency 24-50.
Grass raw material of the present invention is one or more the combination in straw, wheat straw, cotton stalk, bagasse, reed or the giantreed.
Boiling described in the present invention is a kind of in ammonium sulfite boiling, anthraquinone-soda cooking, alkaline sodium sulfite method and the kraft cooking.
Ammonium sulfite boiling of the present invention is:
(1) add cooking liquor in the grass kind plant raw material, wherein the ammonium sulfite consumption is to over dry material quantity 9-13%, and liquor ratio is 1:2-4;
(2) feed steam and heat, heat temperature raising is incubated 20-40 minute when temperature is 110-140 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
Anthraquinone-soda cooking of the present invention is:
(1) in the grass kind plant raw material, add cooking liquor, wherein alkali charge in NaOH to over dry material quantity 9-15%, liquor ratio is 1:2-4, the anthraquinone addition is the 0.5-0.8% of over dry material quantity; Preferred described alkali charge is in the 9-12% of NaOH to the over dry material quantity; More preferably described alkali charge is in the 9-11% of NaOH to the over dry material quantity.
(2) feed steam and heat, heat temperature raising is incubated 20-40 minute when temperature is 110-130 ℃, carry out little steam bleeding, continues heat temperature raising to 160-170 ℃, is incubated 60-90 minute.
Kraft cooking of the present invention is:
(1) in the grass kind plant raw material, add cooking liquor, wherein alkali charge be the NaOH meter to over dry material quantity 8-11%, liquor ratio is 1:2-4, sulphidity is 5-8%;
(2) feed steam and heat, heat temperature raising is incubated 20-40 minute when temperature is 110-140 ℃, carry out little steam bleeding, and continuous heat temperature raising is incubated 60-90 minute to 165-173 ℃.
The boiling of described alkaline sodium sulfite method comprises:
1) in the dogstail raw material, adds steaming preparation, wherein, sodium hydroxide concentration counts 11-15% with the over dry raw material weight, and the sodium sulfite consumption is 2-6% of an over dry raw material weight, the anthraquinone addition is 0.02-0.08% of an over dry raw material weight, and cooking liquor is than being 1:3-4;
2) feed steam and heat, heat temperature raising is incubated 20-40 minutes when temperature is 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 160-165 ℃, is incubated 60-90 minute.
Oxygen delignification of the present invention is:
(1) be permanganate number 16-28 with obtaining hardness after the boiling, the high-hardness pulp that is equivalent to card uncle valency 24-50 is pumped to the oxygen delignification reaction tower, and adds NaOH and oxygen; And
(2) this high-hardness pulp carries out delignification reaction in this oxygen delignification reaction tower, and obtaining hardness is permanganate number 10-14, is equivalent to the slurry of card uncle valency 12.5-19.5;
Wherein, the hardness of the high-hardness pulp in the preferred steps (1) is permanganate number 20-24, is equivalent to card uncle valency 31-39.5, and the hardness of the slurry in the step (2) is permanganate number 11-13, is equivalent to card uncle valency 14-18.
Oxygen delignification described in the present invention is the single hop oxygen delignification, uses an oxygen delignification reaction tower; Described chemical pulp is 95-100 ℃ in the temperature of this reaction tower import department, and pressure is 0.9-1.2MPa, and the temperature in exit is 100-105 ℃, and pressure is 0.2-0.6MPa; Alkali charge is that the addition of oxygen is 20-40kg slurry per ton in the 2-4% of NaOH to the oven dry stock amount in the described oxygen delignification; The reaction time of described high-hardness pulp in this reaction tower is 60-90 minutes.
After boiling, before the oxygen delignification, also comprise shove, described shove is equivalent to carry out shove under the extruding force effect of card uncle's valency 24-50 high-hardness pulp in press master for being permanganate number 16-28 with the hardness that obtains after the boiling in the method for the present invention.
Press master of the present invention is single-screw press master or Var-nip press.
Used fluffer is deflaker or mill fluffer when discongesting in the method for the present invention.
Specifically, a kind of grass type un-bleaching pulp, described brown stock are with the grass feedstock production, and the fracture length of described brown stock is 3.48-7.2km, and folding strength is 15-70 time, and tearability is 180-275mN, and whiteness is 33-48%ISO, and beating degree is 33-38 ° of SR; The fracture length of preferred described brown stock is 5.5-7.2km, and folding strength is 25-70 time, and tearability is 250-275mN, and beating degree is 33-36 ° of SR.
Brown stock of the present invention is a feedstock production with the wheat straw, and its fracture length reaches more than 3480 meters, and folding strength reaches more than 15 times, is a kind of high-quality careless class brown stock, can be used as the slurry that corrugated paper, cutlery box and wrapping paper are produced in preparation.
In the method for the invention, at first can adopt prior art that grass as raw material is got the raw materials ready, promptly adopt conventional dried, wet feed preparation, to remove impurity such as defoliation, fringe, grain, marrow, wheat, can alleviate the pressure of subsequent technique like this, and improve the quality of Straw Pulp.Dried, wet feed preparation can adopt existing conventional equipment, as chaffcutter, screening machine, dust removal machine, wet scrubbing Straw-crumbling machine, inclined screw Water Extraction Machinery etc.Dogstail raw material through the removal moisture after getting the raw materials ready also can be fine fodder, and the moisture of deduction dogstail raw material is the over dry grass, and the length of general blade is at 15-30mm, and the technology of getting the raw materials ready of raw material is technology as well known to those skilled in the art.
In the melting process in the present invention, also can utilize hammer mill to carry out dry raw material preparation, may further comprise the steps:
(1) grass prepared using hammer mill is cut off rubbing and handle, obtain cutting off the raw material after the rubbing;
The grass raw material is delivered in the hammer mill by belt conveyor or other conveyer in this step, and described hammer mill comprises to be carried feeding section, fragmentation and rubbing section and break up the discharge section.The grass raw material at first enters the conveying feeding section of hammer mill, this section mainly plays a part to carry and feeding, enter fragmentation and rubbing section again, the grass raw material effect of power and percussion power that is squeezed in this section, to be that the grass raw material of 300-800mm is hammered into shape disconnected for length when entering hammer mill, so this hammer mill has at first played the effect of chaffcutter; Simultaneously, in this fragmentation and rubbing section, the effect of being squeezed of grass raw material, cross section makes impurity such as leaf, awns, wheat, grain, marrow separate with stalk for circular grass raw material is crushed, and separation rate is 70-90%.Discharge section from the grass raw material that hammer mill rubbing section is come through breaing up, the grass raw material that presses together is broken up, the contact-making surface of raw material and cooking liquor is big, therefore infiltration easily, thereby the process of accelerating delignification.Last grass raw material is discharged from the outlet of hammer mill.The 20-50mm of the grass raw material of being discharged.
Hammer mill among the present invention is the beater grinder that ore dressing or bark are pulverized usefulness in the prior art.The rotating speed of described hammer mill is 500-800rpm, the speed that the grass raw material enters hammer mill is 0.5-1.0m/s, rotating speed is crossed words low or that charging is too fast, can cause some grass raw materials not crumpled fully, the infiltration of cooking liquor after the influence, and then influence pulp quality.
Grass raw material skin has one deck wax, and there is one deck marrow its bar inside, and in the general method of getting the raw materials ready, when skin was flooded by cooking liquor, wax can be removed soon, but because the internal layer of its bar has air, so cooking liquor is difficult to enter.After grass prepared using hammer mill cut off and crumple, help the abundant dipping of dogstail raw material, obtain the measured straw pulp of matter after the boiling easily.
(2) raw material that will cut off after the fragmentation carries out dust removal process;
Carry out dust removal process through the raw material after the cut-out fragmentation, this is owing to contain impurity such as dust, sandstone, blade of grass, careless fringe in the blade after cutting off, through dust removal process, above-mentioned impurity major part is removed, therefore in the digestion process after getting the raw materials ready, chemicals consumption in the time of can reducing boiling, the time of boiling also can shorten accordingly.
Carrying out dust removal machine that dust removal process adopted among the present invention can comprise roll-type dust removal machine, double cone dust removal machine and cyclone dust removal machine for the used dust removal machine of getting the raw materials ready of grass raw material in the prior art, and preferred described dust removal machine is the cyclone dust removal machine.Air quantity is 30000-38000m when carrying out dust removal process in cyclone dust collectors
3/ h, blast 210mmHgO.Under such condition, can remove dust contained in the dogstail raw material in a large number, thereby alleviate the burden of follow-up boiling.
(3) will carry out Screening Treatment through the raw material of dust removal process.
The grass raw material often has foreign material such as thick blade and broken end through after the dust removal process, and in digestion process, these foreign material have is difficult for being permeated by cooking liquor, thus generation steaming separate thing; Though react with cooking liquor at the broken end that has, but black liquor viscosity is increased, influence the circulation of cooking liquor, cause half steaming, cause operating difficulties, influence the amount of black liquor extraction and the wash degree of slurry, so this step of Screening Treatment is a crucial step in the grass raw material dry raw material preparation.
Drum sieve of the present invention is the drum sieve that is used for grass raw material dry raw material preparation in the prior art.The rotating speed of described drum sieve is 18-29r/min, the inclination angle is 6-12 °, drum sieve of the present invention is a double-layer cylinder screen, the length of side of the nexine sieve plate square sieve aperture of drum sieve is 30-40mm, the diameter 4-6mm of outer sieve plate sieve aperture, in the process of this Screening Treatment, big blade and other tiny impurity such as silt, dust etc. are screened to come out, and paper pulp is clean after having guaranteed.
After the dry raw material preparation method of the present invention, the edulcoration rate of dogstail raw material reaches more than 90%, and general method to carry out the edulcoration rate of dry raw material preparation be 80%, so not only can reduce the dust in the slurry, make that prepared slurry is clean, the yield height, yield improves 1-3% than general method, reduces 0.5-2% with method production cost of the present invention.
Can before boiling, carry out impregnation process in the method for the present invention to raw material, maceration extract is flooded wheat straw raw material, make liquor ratio reach 1:2-4, in insulation and mixing more than 10 minutes in the spiral macerator more than 85 ℃, wherein insulation mixes 10-40 minute for well between 85-95 ℃ under normal pressure.Maceration extract is fully contacted with wheat straw raw material, make the dipping of wheat straw raw material evenly complete.Described maceration extract can be certain density aqueous slkali, in 4% the aqueous slkali of NaOH to the over dry material quantity, also can be the mixed liquor of above-mentioned aqueous slkali and black liquor as alkali charge, and the concentration of used black liquor is 11-14 ° of Be ' (20 ℃).Raw material has been carried out impregnation process, utilized black liquor as waste material, make black liquor obtain cycling and reutilization, reduced the pressure that environment is handled black liquor, because to the preliminary treatment of raw material dipping, make that heteroproteose cell, hemicellulose, the lignin deviate from are that main black liquid separation is discharged when heat treated, for next step boiling is got ready.The described process that raw material is carried out impregnation process belongs to preprocessing process, its main purpose be for after in the digestion process infiltration of cooking liquor get ready, so this step can be omitted.
Boiling step in the inventive method is the key of slurrying, because institutional framework, microstructure, chemical composition and the lignin molecular structure etc. of timber and wheat straw raw material are all variant, therefore, the delignification reaction course also has very big difference in digestion process.For wheat straw raw material Ammonium Sulfite Method boiling delignification reaction course, comprise intensification and be incubated two sections.The characteristics of wheat straw raw material are that delignification is more or less freely, and compare with wood raw material, and the temperature of a large amount of strippings of lignin is more in advance.
Making grass pulp is exactly the effect that utilizes cooking liquor, suitably removes the lignin in the grass raw material, keeps cellulose and hemicellulose as far as possible and is beneficial to copy paper.In fact in digestion process because action of high temperature, certain chemical change all can take place in the lignin in the raw material, cellulose, hemicellulose and other composition, be subjected in various degree degraded and damage, therefore must study the Changing Pattern of raw material in digestion process, formulate suitable conditions of cooking.In the pulping process of the present invention, by consumption and concentration to cooking liquor, the length of boiling and temperature retention time, the height of boiling temperature carries out systematic research, under the condition that reduces the infringement of cellulose and hemicellulose as much as possible, carry out boiling, both reduce production cost thereby reach, energy savings can improve the purpose of the yield of slurrying again.
Through obtaining high-hardness pulp after the boiling, the hardness of described high-hardness pulp is equivalent to card uncle valency 24-50 for permanganate number 16-28 in the method for the present invention; The hardness of preferred described high-hardness pulp is equivalent to card uncle valency 29-48 for permanganate number 18-27; Described high-hardness pulp most preferably hardness is equivalent to card uncle valency 34-42 for permanganate number 20-25.
The high-hardness pulp of the boiling preparation among the present invention is as the raw material of preparation brown stock.In the preparation method of the boiling of prior art, exist the time of boiling and insulation long, the stewing temperature height, the cooking liquor consumption is big, the problem that temperature retention time is long.And in the method for the invention, the consumption of cooking liquor is few, and the time of boiling and insulation shortens greatly.In the boiling method of the present invention, by consumption and concentration to cooking liquor, the length of boiling and temperature retention time, the height of boiling temperature carries out systematic research, under the condition that reduces the infringement of cellulose and hemicellulose as much as possible, carry out boiling, both reduce production cost thereby reach, energy savings can improve the purpose of the yield of slurrying again.The yield of the resulting high-hardness pulp of described boiling method is 58-68%.
In the method for the invention, after boiling finishes, spurt to spraying pot after the pressure dilution that the high-hardness pulp maintenance of gained is certain, described pressure is 0.75MPa.Dilution can be clear water, also can be the used black liquor of aforementioned impregnation process.The concentration of the high-hardness pulp in the spraying pot is 8-15% at this moment, hardness is equivalent to card uncle valency 26-50 for permanganate number 16-28, beating degree is 22-28 ° of SR, be connected by delivery pump between spraying pot and the acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of acroll press washer, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, the concentration of the slurry of sending is brought up to 20-38% by 8-15%, become the high-hardness pulp of high concentration, temperature is 70-80 ℃.In shove, most of black liquor is extruded the back and stores in the black liquor groove.Selected press master is to extract the acroll press washer that black liquor is used in the prior art, is preferably single-screw press master or the Double screw pulp extruder and the Var-nip press of reducing varying pitch.
Described acroll press washer can be one, also can for two be that described shove can be for carrying out shove through one acroll press washer, also can for through after the first road acroll press washer shove again through the second road acroll press washer shove.
When using press master to carry out shove, because the process at shove can produce very big extruding force, temperature rises rapidly, impel fiber separation, divide silk, brooming, conquassation, primary wall is destroyed, the enough energy of fiber absorbs make fibrous inside produce very big stress, and the reactivity worth of high-hardness pulp is greatly improved.Simultaneously, fiber produces fibrillating, and impurity is dissolved in the black digestion liquid between epidermis organic matter and fiber, discharges by liquid outlet groove, and fiber fineness is greatly improved.Some ash contents in the black liquor and impurity are also along with black liquor is discharged from, for next step operation has been carried out sufficient preparation.Most preferred press master is the press master of spiral reducing among the present invention, utilizes the reducing press master, makes slurry in the space that slowly diminishes, and makes the about dehydration of compressed slurry layer consistent.The single-screw reducing press master that the present invention is selected, after high-hardness pulp was carried out shove, the beating degree of described high-hardness pulp changed little, and beating degree is 22-28 ° of SR before the shove, and beating degree is 23-29 ° of SR after the shove.That is to say that described high-hardness pulp can the fibre length that fibers in grass class is intrinsic keep relatively goodly through after the press master shove, has reduced the damage of fiber to greatest extent.
When carrying out shove, also can adopt Var-nip press, the use of Var-nip press, also can be the same with the single-screw press master, reduce the damage of fiber to greatest extent, and because the extraction rate of black liquor height of described Var-nip press, therefore make that water consumption significantly reduces in the subsequent washing process, water consumption is less than the single-screw press master greatly, reaches more than 30% through the concentration of high-hardness pulp after the shove, and high energy reaches 38%.
In the method for the present invention, when carrying out the washing of high-hardness pulp, resulting high concentration high-hardness pulp after resulting high-hardness pulp after the boiling or the shove dilutes in general elder generation, with concentration is that to be diluted to concentration be 2.5-3.5% for the black liquor of 11-14 ° of Be ' (20 ℃), screening technique through prior art screens as jumping the sieve screening method again, and loss is 0.2-0.5% in the screening.Next wash, can adopt vacuum pulp washing machine of the prior art or pressure washer to wash.The purpose that adopts vacuum pulp washing machine is the easier inside and outside pressure difference of fibrocyte that is formed in the washing process, so more helps the wash degree that reaches high in washing process.In order to reach higher wash degree, the number of times of washing can also can be twice or three times for once.
In the method for the present invention, after carrying out pulp washing, the concentration of slurry can be delivered to this slurry fluffer and discongests processing through conveying worm between 9-11%, and the button degree of separating of handling the back slurry is at 26-28 ° of SR, weight in wet base 1.5-1.7g, temperature 65-70 ℃.Described fluffer is the existing equipment of discongesting, as deflaker, and the mill fluffer.By discongesting, fiber can be rubbed with the hands and open, the lignin between fiber and the fiber is exposed out, helps the carrying out of the oxygen delignification step of back.
With the high-hardness pulp that obtains after the boiling or after discongesting after the slurry of gained or the pulp washing slurry of gained carry out oxygen delignification, described oxygen delignification is: alkali charge is in the 2-4% of NaOH to the oven dry stock amount, and the addition of oxygen is to bleach 75-90 minutes under the condition of 20-40kg slurry per ton.The hardness k value (permanganate number) of starching this moment is reduced to 11-13 and is equivalent to card uncle valency 12.5-17, and beating degree is 33-36 ° of SR.The preferred described oxygen delignification of the present invention is the single hop oxygen delignification, use an oxygen delignification reaction tower, high-hardness pulp is 95-100 ℃ in the temperature of this reaction tower import department, and pressure is 0.9-1.2MPa, the temperature in exit is 100-105 ℃, and pressure is 0.2-0.6MPa.Adopting the single hop oxygen delignification mainly is the intensity that guarantees paper pulp for further, relative multistage oxygen delignification, and the single hop oxygen delignification is less to cellulosic degradation.Generally speaking temperature is lower for the technological parameter of the preferred single hop oxygen delignification of the present invention, comparatively speaking the time longer, mainly be for the gentle more delignification reaction that carries out, avoid cellulosic degraded as far as possible.The concentration of the preferred high-hardness pulp of the present invention before carrying out oxygen delignification is 8-18%.In carry out oxygen delignification under the dense condition.In the major advantage of dense oxygen delignification be: invest less; Since in the success of dense mixing and pumping technology, the processing of slurry is dense more much easier than high; Slurry concentration is lower, and the corrosion of equipment is few, also the danger of not burning in oxygen.
Brown stock described in the present invention is process boiling, an oxygen delignification resulting slurry before bleaching afterwards, and the fracture length of the brown stock of gained is 3.48-7.2km, and folding strength is 15-70 time, and tearability is 180-275mN, and whiteness is 33-48%ISO.
In addition, brown stock of the present invention can be used for preparing newsprint, supercalendered paper, wrapping paper, paper diaper, crepe toilet paper, tissue, face tissue, napkin paper, tissue, paper for kitchen, writing paper, offset paper, offset printing paper, single face writing paper, M.G.offset paper and corrugated paper.
Also can be used for preparing moulded paper pulp product, described goods comprise: bowl, basin, cup, bucket, dish, dish, pallet and cutlery box; Carriage, electric welding protective cover, Indoor decorative plate, molding flowerpot, molding seedling-raising cup, molding slippers and adsorptive pads toilet seat cushion; Molding medical tray container, molding medical nursing product and disposable medical vessel.
The invention has the beneficial effects as follows: with the brown stock of grass feedstock production, fracture length is 3.48-7.2km, and folding strength is 15-70 time, and tearability is 180-275mN, and whiteness is 33-48%ISO.Described brown stock can be used as the slurry of corrugation, paper meal and wrapping paper.Owing in the process of preparation, handle through bleaching, so can not be subjected to the pollution of bleaching agent in the slurry that obtains, the intensity of slurry has obtained protection simultaneously, has avoided making because of the influence of bleaching cellulose degradation in the slurry.And dogstail raw material used among the present invention is very abundant, and price is low.Except using a certain grass kind plant, several grass raw materials can also be mixed among the present invention, make various raw materials to learn from other's strong points to offset one's weaknesses, bring into play the advantage of various raw materials, prepare high-quality brown stock.Among the preparation method of the present invention,, shorten the time of boiling, prepare high-hardness pulp by reducing the consumption of cooking liquor.The minimizing of chemical liquid consumption and the shortening of digestion time all can reduce enterprise's production cost greatly, and yield is greatly improved, thereby have improved production efficiency greatly.Simultaneously, the high-hardness pulp of wheat straw ammonium sulfite boiling preparation of the present invention can be used as the raw material of preparation brown stock, because the concentration of used soup reduces during boiling, and the time of boiling and insulation also shortens greatly, thereby on to greatest extent, having reduced the loss of needed cellulose and hemicellulose in the paper pulp, the yield of paper pulp is greatly improved.
The specific embodiment
Embodiment 1
Wheat straw raw material is adopted in the digester of packing into after the conventional dry raw material preparation, in digester, add cooking liquor, the ammonium sulfite addition is 9% of an over dry material quantity, liquor ratio 1:3, heat temperature raising to 110 ℃ for the first time, insulation is 30 minutes under this temperature, littler steam bleeding 25 minutes, post bake heat up 60 minutes to temperature be 168 ℃, be incubated 90 minutes.The hardness of resulting high-hardness pulp is 22 to be equivalent to card uncle valency 35.5 after the boiling, and being diluted to concentration with rare black liquor is 2.5-3.5%, and the screening technique through prior art screens as jumping the sieve screening method again, and losing in the screening is 0.2-0.5%.Adopt three sections vacuum pulp washing machine washings in the prior art again.Obtaining concentration after the washing is 10% high-hardness pulp, heats this slurry to 70 ℃ and is transported to middle underflow pipe by conveying worm then.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 4%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock amount; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 75 minutes, tower top temperature is 100 ℃, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 5.5km, and folding strength is 35 times, and tearability is 220mN, and whiteness is 33%ISO, and beating degree is 34 ° of SR.
Embodiment 2
Utilize hammer mill to carry out after the dry raw material preparation straw raw material, pack in the digester, in digester, add cooking liquor, the ammonium sulfite addition is 13% of an over dry material quantity, liquor ratio 1:4, for the first time heat temperature raising to 120 ℃, insulation is 40 minutes under this temperature, again little steam bleeding 25 minutes, post bake heat up 60 minutes to temperature be 168 ℃, be incubated 90 minutes.The hardness of resulting high-hardness pulp is 16 to be equivalent to card uncle valency 23 after the boiling, and being diluted to concentration with rare black liquor is 2.5-3.5%, and the screening technique through prior art screens as jumping the sieve screening method again, and losing in the screening is 0.2-0.5%.Adopt three sections vacuum pulp washing machine washings in the prior art again.Obtaining concentration after the washing is 10% high-hardness pulp, heats this slurry to 70 ℃ and is transported to middle underflow pipe by conveying worm then.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3.5%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock amount; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 75 minutes, tower top temperature is 100 ℃, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 6.8km, and folding strength is 50 times, and tearability is 250mN, and whiteness is 45%ISO, and beating degree is 36 ° of SR.
Embodiment 3
The bagasse raw material is passed through in the digester of packing into after the dry method routine is got the raw materials ready and emedullated, in digester, add cooking liquor, the ammonium sulfite addition is 11% of an over dry material quantity, liquor ratio 1:2, heat temperature raising to 130 ℃ for the first time, insulation is 20 minutes under this temperature, littler steam bleeding 20 minutes, post bake heat up 50 minutes to temperature be 165 ℃, be incubated 70 minutes.It is 21 to be equivalent to the high-hardness pulp of card uncle valency 32 that boiling obtains hardness, then high-hardness pulp is sent into the Var-nip press that the extraction black liquor is used in the prior art and carried out shove, obtain concentration after the shove and be 32% high-hardness pulp, be diluted to the washing of delivering to three sections vacuum pulp washing machines after 2.5% through black liquor again, slurry concentration is the underflow pipe in 10-13% heats the slurry of gained this slurry to 70 ℃ then and is transported to by conveying worm.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 30kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock weight 3%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 0.8% of an oven dry stock weight; 98 ℃ of inlet temperatures; pressure 1.05Mpa; stop and made this slurry can carry out sufficient delignification reaction in 85 minutes, tower top temperature is 102 ℃, and pressure remains 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 5.2km, and folding strength is 25 times, and tearability is 180mN, and whiteness is 40%ISO, and beating degree is 35 ° of SR.
Embodiment 4
In the digester of packing into after the conventional dry raw material preparation of giantreed, in digester, add cooking liquor, the ammonium sulfite addition is 11% of an over dry material quantity, liquor ratio 1:3, heat temperature raising to 140 ℃ for the first time, insulation is 40 minutes under this temperature, littler steam bleeding 20 minutes, post bake heat up 60 minutes to temperature be 175 ℃, be incubated 90 minutes.Obtaining hardness after the boiling and be 27, to be equivalent to card uncle valency be 48 high-hardness pulp, then high-hardness pulp is sent into the reducing single-screw press master that the extraction black liquor is used in the prior art and carried out shove, obtain concentration after the shove and be 26% high-hardness pulp, the slurry that comes out from press master is diluted to the concentration of slurry to 2.5-3.0% with rare black liquor, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the slurry that will obtain after will removing the gred again enters three sections vacuum pulp washing machines and washs, slurry concentration during washing is 2.0%, the slurry concentration of coming out from wash engine is 9%, keep 68-70 ℃ in the washing process, be transported in the fluffer again and discongest, the beating degree of the giantreed slurry before discongesting is 24 ° of SR, and the beating degree of the giantreed slurry after discongesting is 27 ° of SR, transfers densely to heat this slurry to 70 ℃ and be transported to middle underflow pipe by conveying worm to 10% back.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 30kg slurry per ton that adds and alkali charge for oven dry stock amount 4% aqueous slkali is mixed in NaOH, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 102 ℃ of inlet temperatures; pressure 1.2Mpa; stop and made this slurry can carry out sufficient delignification reaction in 90 minutes, tower top temperature is 105 ℃, and pressure remains 0.5MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 4.1km, and folding strength is 11 times, and tearability is 375mN, and whiteness is 37%ISO, and beating degree is 33 ° of SR.
Embodiment 5
In the digester of packing into after the conventional dry raw material preparation of cotton stalk, in digester, add cooking liquor, the ammonium sulfite addition is 13% of an over dry material quantity, liquor ratio 1:2.8, heat temperature raising to 140 ℃ for the first time, insulation is 40 minutes under this temperature, littler steam bleeding 20 minutes, post bake heat up 65 minutes to temperature be 175 ℃, be incubated 100 minutes.Obtaining hardness after the boiling and be 26, to be equivalent to card uncle valency be 46 high-hardness pulp, then high-hardness pulp is sent into the reducing single-screw press master that the extraction black liquor is used in the prior art and carried out shove, the slurry that comes out from press master is diluted to the concentration of slurry to 2.5-3.0% with rare black liquor, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.6%, remove impurity by the high concentration scummer again, loss 0.3%, the slurry that will obtain after will removing the gred again enters three sections vacuum pulp washing machines and washs, slurry concentration during washing is 2.0%, the slurry concentration of coming out from wash engine is 12%, keep 68-70 ℃ in the washing process, after be transported in the mill fluffer and discongest, the beating degree of the cotton stalk pulp before discongesting is 32 ° of SR, the beating degree of the cotton stalk pulp after discongesting is 33 ° of SR, transfers dense 10% back to heat this slurry to 70 ℃ by conveying worm and be transported to middle underflow pipe.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 35kg slurry per ton that adds and alkali charge for oven dry stock amount 4% aqueous slkali is mixed in NaOH, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 100 ℃ of inlet temperatures; pressure 1.1Mpa; stop and made this slurry can carry out sufficient delignification reaction in 90 minutes, tower top temperature is 104 ℃, and pressure remains 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 3.8km, and folding strength is 15 times, and tearability is 396mN, and whiteness is 38%ISO, and beating degree is 34 ° of SR.
Embodiment 6
Is after 1:4 carries out conventional dry raw material preparation with reed and cotton stalk by mass ratio, pack in the digester, in digester, add cooking liquor, alkali charge in NaOH to 13% of over dry material quantity, the anthraquinone addition is 0.5% of an over dry material quantity, liquor ratio 1:3, heat temperature raising to 115 ℃ for the first time, insulation is 25 minutes under this temperature, littler steam bleeding 30 minutes, post bake heat up 50 minutes to temperature be 170 ℃, be incubated 90 minutes.Obtain hardness after the boiling and be 20 and be equivalent to the high-hardness pulp of card uncle valency 30, regulate the concentration to 18% of high-hardness pulp, after be transported in the mill fluffer and discongest, wash through conventional washing methods again, heat this slurry to 70 ℃ and be transported to middle underflow pipe by conveying worm afterwards.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 35kg slurry per ton that adds and alkalinity for mixing in 2.5% the aqueous slkali of NaOH to the oven dry stock amount, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 100 ℃ of inlet temperatures; pressure 1.2Mpa; stop and made this slurry can carry out sufficient delignification reaction in 80 minutes, tower top temperature is 105 ℃, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 3.9km, and folding strength is 60 times, and tearability is 250mN, and whiteness is 35%ISO, and beating degree is 37 ° of SR.
Embodiment 7
Reed is packed in the digester, in digester, add cooking liquor, alkali charge is to 9% of over dry material quantity in NaOH, the anthraquinone addition is 0.8%, liquor ratio 1:4, for the first time heat temperature raising to 110 ℃, insulation is 40 minutes under this temperature, again little steam bleeding 30 minutes, post bake heat up 50 minutes to temperature be 173 ℃, be incubated 60 minutes.Obtain hardness after the boiling and be 24 high-hardness pulps that are equivalent to card uncle valency 41, then high-hardness pulp is sent into the reducing single-screw press master that the extraction black liquor is used in the prior art and carried out shove, obtain concentration after the shove and be 20% high-hardness pulp, wash with conventional washing methods such as pressure washer again, after be transported in the mill fluffer and discongest, heat this slurry to 70 ℃ by conveying worm then and be transported in the underflow pipe.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for oven dry stock weight 4% aqueous slkali is mixed in NaOH, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 70 minutes, tower top temperature is 100 ℃, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 3.48km, and folding strength is 15 times, and tearability is 260mN, and whiteness is 46%ISO, and beating degree is 38 ° of SR.
Embodiment 8
To pack in the digester through the cotton stalk behind the conventional dry raw material preparation, in digester, add cooking liquor, alkali charge is 8% of an over dry material quantity, sulphidity is 8%, liquor ratio 1:2, for the first time heat temperature raising to 110 ℃, insulation is 40 minutes under this temperature, again little steam bleeding 25 minutes, post bake heat up 45 minutes to temperature be 166 ℃, be incubated 75 minutes.Obtain hardness after the boiling and be 25 high-hardness pulps that are equivalent to card uncle valency 43, be transported in the deflaker and discongest, then high-hardness pulp is sent into the Var-nip press that the extraction black liquor is used in the prior art and carried out shove, obtain concentration after the shove and be 32% high-hardness pulp, regulate concentration to 2.5% with rare black liquor again, wash through conventional washing methods after slagging-off, the slurry that goes out pulp washing is dense to be adjusted to 15%. again, heats this slurry to 70 ℃ and is transported to middle underflow pipe by conveying worm then.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock weight 3%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 60 minutes, tower top temperature is 100 ℃, and pressure remains 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 4.3km, and folding strength is 70 times, and tearability is 275mN, and whiteness is 48%ISO, and beating degree is 34 ° of SR.
Embodiment 9
With mass ratio is that the straw of 1:3 and wheat straw utilize hammer mill to carry out packing into behind the dry raw material preparation in the digester, in digester, add cooking liquor, alkali charge is to 11% of over dry material quantity in NaOH, sulphidity is 5%, liquor ratio 1:4, for the first time heat temperature raising to 110 ℃, insulation is 20 minutes under this temperature, again little steam bleeding 30 minutes, post bake heat up 40 minutes to temperature be 168 ℃, be incubated 90 minutes.The hardness that obtains after the boiling is 19 to be equivalent to the high-hardness pulp of card uncle valency 29, deliver to the reducing single-screw press master that conventional extraction black liquor uses again and carry out shove, the slurry that comes out from press master is diluted to the concentration to 3.0% of slurry with rare black liquor, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the slurry that will obtain after will removing the gred again enters the horizontal belt wash engine and washs, slurry concentration during washing is 3.0%, the slurry concentration of coming out from wash engine is 9%, keep 68-70 ℃ in the washing process, be transported in the deflaker and discongest, slurry makes it fluidization by the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment again, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock weight 4%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 75 minutes, tower top temperature is 100 ℃, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 7.2km, and folding strength is 45 times, and tearability is 250mN, and whiteness is 42%ISO, and beating degree is 33 ° of SR.
Embodiment 10
Utilize hammer mill to carry out packing into behind the dry raw material preparation in the digester straw, in digester, add cooking liquor, alkali charge in NaOH to 15% of over dry material quantity, liquor ratio 1:3, the anthraquinone addition is 0.6% of an over dry material quantity, for the first time heat temperature raising to 120 ℃, insulation is 20 minutes under this temperature, again little steam bleeding 20-30 minute, post bake heat up 40 minutes to temperature be 168 ℃, be incubated 90 minutes.Obtain hardness after the boiling and be 18 high-hardness pulps that are equivalent to card uncle valency 27, deliver to the reducing single-screw press master that conventional extraction black liquor uses again and carry out shove, the slurry that comes out from press master is diluted to the concentration of slurry to 2.5-3.0% with rare black liquor, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the slurry that will obtain after will removing the gred again enters the horizontal belt wash engine and washs, slurry concentration during washing is 3.0%, the slurry concentration of coming out from wash engine is 9%, keep 68-70 ℃ in the washing process, be transported in the deflaker again and discongest, transfer dense back to heat this slurry to 70 ℃ and be transported to middle underflow pipe by conveying worm.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity in 4% the aqueous slkali of NaOH to the oven dry stock amount, and in pipeline, feed steam and should starch heat temperature raising.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 102 ℃ of inlet temperatures; pressure 1.12Mpa; stop and made this slurry can carry out sufficient delignification reaction in 70 minutes, tower top temperature is 104 ℃, and pressure remains 0.5MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 4.4km, and folding strength is 65 times, and tearability is 245mN, and whiteness is 37%ISO, and beating degree is 34 ° of SR.
Embodiment 11
In the digester of packing into after the conventional dry raw material preparation of giantreed, in digester, add cooking liquor, alkali charge is to 11% of oven dry stock amount in NaOH, the anthraquinone addition is 0.8%, liquor ratio 1:4, for the first time heat temperature raising to 130 ℃, insulation is 40 minutes under this temperature, again little steam bleeding 30 minutes, post bake heat up 60 minutes to temperature be 173 ℃, be incubated 60 minutes.Obtaining hardness after the boiling and be 25, to be equivalent to card uncle valency be 45 high-hardness pulp, then high-hardness pulp is sent into the reducing single-screw press master that the extraction black liquor is used in the prior art and carried out shove, obtain concentration after the shove and be 20% high-hardness pulp, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the slurry that will obtain after will removing the gred again enters three sections vacuum pulp washing machines and washs, slurry concentration during washing is 2.0%, the slurry concentration of coming out from wash engine is 9%, keeps 68-70 ℃ in the washing process, transfers dense back to heat this slurry to 70 ℃ and be transported to middle underflow pipe by conveying worm.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkali charge for oven dry stock amount 4% aqueous slkali is mixed in NaOH, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 102 ℃ of inlet temperatures; pressure 1.12Mpa; stop and made this slurry can carry out sufficient delignification reaction in 75 minutes, tower top temperature is 104 ℃, and pressure remains 0.5MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 4.5km, and folding strength is 69 times, and tearability is 255mN, and whiteness is 42%ISO, and beating degree is 33 ° of SR.
Embodiment 12
To put into rotary spherical digester through the wheat straw that length behind the conventional dry raw material preparation is about 15mm, and add steaming preparation and carry out boiling in rotary spherical digester, in the over dry material quantity, sodium hydroxide concentration 15%, sodium sulfite consumption are 6%, and the anthraquinone consumption is 0.03%, and liquor ratio is 1:3; Feed steam and heat, heat temperature raising insulation 20 minutes when temperature is 120 ℃ was carried out little steam bleeding 30 minutes then, continued heat temperature raising to 165 ℃, was incubated 60 minutes.Obtaining hardness after the boiling is permanganate number 22, is equivalent to the high-hardness pulp of card uncle valency 35, adopts deflaker that high-hardness pulp is discongested then, utilizes three sections vacuum pulp washing machines to carry out pulp washing afterwards, regulates the concentration to 12% of slurry behind the pulp washing again.
Heat this slurry to 70 ℃ by conveying worm then and be transported in the underflow pipe.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 30kg slurry per ton that adds and alkali charge for to mix in the aqueous slkali of NaOH to oven dry stock amount 4%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 0.5% of an oven dry stock weight; 95 ℃ of inlet temperatures; pressure 0.9Mpa stops in 90 minutes and makes this slurry can carry out sufficient delignification reaction, and tower top temperature is 104 ℃; pressure remains 0.5MPa, and the delignification rate is 86% in the oxygen delignification process.After finishing dealing with this slurry is spurted stock tank and dilution, this moment, the hardness (permanganate number) of slurry was reduced to 14, was equivalent to card uncle valency 19.5.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards.Can obtain a kind of brown stock of straw raw material preparation, whiteness is 54%ISO, and fracture length is 6.9km, and tearability is 295mN, and folding number is 59 times, and beating degree is 33 ° of SR.
Embodiment 13
With mass ratio is that straw, wheat straw and the reed of 1:3:1 utilizes hammer mill to carry out packing into behind the dry raw material preparation in the digester, in digester, add steaming preparation, alkali charge is to 11% of over dry material quantity in NaOH, the sodium sulfite consumption is 2% of an over dry raw material weight, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio 1:4, heat temperature raising to 110 ℃ for the first time, insulation is 20 minutes under this temperature, again little steam bleeding 30 minutes, post bake heat up 40 minutes to temperature be 165 ℃, be incubated 60 minutes.The hardness that obtains after the boiling is 19 to be equivalent to the high-hardness pulp of card uncle valency 29, deliver to the reducing single-screw press master that conventional extraction black liquor uses again and carry out shove, the slurry that comes out from press master is diluted to the concentration to 3.0% of slurry with rare black liquor, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the slurry that will obtain after will removing the gred again enters the horizontal belt wash engine and washs, slurry concentration during washing is 3.0%, the slurry concentration of coming out from wash engine is 9%, keep 68-70 ℃ in the washing process, be transported in the deflaker and discongest, slurry makes it fluidization by the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment again, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock weight 4%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 75 minutes, tower top temperature is 100 ℃, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 6.5km, and folding strength is 45 times, and tearability is 250mN, and whiteness is 42%ISO, and beating degree is 33 ° of SR.
Embodiment 14
Utilize hammer mill to carry out after the dry raw material preparation straw raw material, pack in the digester, add steaming preparation in digester, alkali charge is to 13% of over dry material quantity in NaOH, the sodium sulfite consumption is 4% of an over dry raw material weight, the anthraquinone addition is 0.05% of an over dry material quantity, liquor ratio 1:3.5, for the first time heat temperature raising to 110 ℃, insulation is 30 minutes under this temperature, again little steam bleeding 25 minutes, post bake heat up 60 minutes to temperature be 163 ℃, be incubated 75 minutes.The hardness of resulting high-hardness pulp is 16 to be equivalent to card uncle valency 23 after the boiling, and being diluted to concentration with rare black liquor is 2.5-3.5%, and the screening technique through prior art screens as jumping the sieve screening method again, and losing in the screening is 0.2-0.5%.Adopt three sections vacuum pulp washing machine washings in the prior art again.Obtaining concentration after the washing is 10% high-hardness pulp, heats this slurry to 70 ℃ and is transported to middle underflow pipe by conveying worm then.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3.5%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock amount; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 75 minutes, tower top temperature is 100 ℃, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 5.5km, and folding strength is 70 times, and tearability is 250mN, and whiteness is 45%ISO, and beating degree is 36 ° of SR.
Above embodiment is used to explain the present invention, and unrestricted the present invention.Simple change as the method for oxygen delignification, the method for boiling etc. all should belong to protection scope of the present invention.
Claims (15)
1, a kind of grass type un-bleaching pulp is characterized in that, described brown stock is with the grass feedstock production, the fracture length of described brown stock is 3.48-7.2km, and folding strength is 15-70 time, and tearability is 180-275mN, whiteness is 33-48%ISO, and beating degree is 33-38 ° of SR.
2, brown stock as claimed in claim 1 is characterized in that, the fracture length of described brown stock is 5.5-7.2km, and folding strength is 25-70 time, and tearability is 250-275mN, and beating degree is 33-36 ° of SR.
3, a kind of method for preparing claim 1 or 2 described brown stocks, described method comprises the step of boiling, oxygen delignification, it is characterized in that, described boiling comprises that with the grass material cooking be the high-hardness pulp of permanganate number 16-28 to hardness.
4, method according to claim 3 is characterized in that, described grass raw material is one or more the combination in straw, wheat straw, cotton stalk, bagasse, reed or the giantreed.
According to claim 3 or 4 described methods, it is characterized in that 5, described boiling is ammonium sulfite boiling, anthraquinone-soda cooking, kraft cooking or the boiling of alkaline sodium sulfite method.
6, method according to claim 5 is characterized in that, described ammonium sulfite boiling is:
(1) add cooking liquor in the grass kind plant raw material, wherein the ammonium sulfite consumption is the 9-13% to the over dry material quantity, and liquor ratio is 1:2-4;
(2) feed steam and heat, heat temperature raising to temperature is 110-140 ℃ of insulation 20-40 minute, carries out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
7, method according to claim 5 is characterized in that, described anthraquinone-soda cooking is:
(1) in the grass kind plant raw material, add cooking liquor, wherein alkali charge in NaOH to over dry material quantity 9-15%, liquor ratio is 1:2-4, the anthraquinone addition is the 0.5-0.8% of over dry material quantity;
(2) feed steam and heat, heat temperature raising is incubated 20-40 minute when temperature is 110-130 ℃, carry out little steam bleeding, continues heat temperature raising to 160-170 ℃, is incubated 60-90 minute.
8, method according to claim 5 is characterized in that, described kraft cooking is:
(1) in the grass kind plant raw material, add cooking liquor, wherein alkali charge be the NaOH meter to over dry material quantity 8-11%, liquor ratio is 1:2-4, sulphidity is 5-8%;
(2) feed steam and heat, heat temperature raising is incubated 20-40 minute when temperature is 110-140 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
9, method according to claim 5, the boiling of described alkaline sodium sulfite method comprises:
1) in the dogstail raw material, adds steaming preparation, wherein, sodium hydroxide concentration counts 11-15% with the over dry raw material weight, and the sodium sulfite consumption is 2-6% of an over dry raw material weight, the consumption of anthraquinone is 0.02-0.08% of an over dry raw material weight, and cooking liquor is than being 1:3-4;
2) feed steam and heat, heat temperature raising is incubated 20-40 minutes when temperature is 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 160-165 ℃, is incubated 60-90 minute.
10, method according to claim 3 is characterized in that, described oxygen delignification is:
(1) is that the high-hardness pulp of permanganate number 16-28 is pumped to the oxygen delignification reaction tower with obtaining hardness after the boiling, and adds NaOH and oxygen; And
(2) this high-hardness pulp carries out delignification reaction in this oxygen delignification reaction tower, obtains the slurry that hardness is permanganate number 10-14.
11, method as claimed in claim 10 is characterized in that, the high-hardness pulp hardness in the step (1) is permanganate number 20-24, and the hardness of the slurry in the step (2) is permanganate number 11-13.
12, method according to claim 10 is characterized in that, described oxygen delignification is the single hop oxygen delignification, uses an oxygen delignification reaction tower; Described high-hardness pulp is 95-100 ℃ in the temperature of this reaction tower import department, and pressure is 0.9-1.2MPa; The temperature in exit is 100-105 ℃, and pressure is 0.2-0.6MPa; Alkali charge is that the addition of oxygen is 20-40kg slurry per ton in the 2-4% of NaOH to the oven dry stock amount in the described oxygen delignification; The reaction time of described high-hardness pulp in this reaction tower is 60-90 minutes.
13, method according to claim 3, it is characterized in that, after boiling, before the oxygen delignification, also comprise shove, described shove is for being to carry out shove under the extruding force effect of permanganate number 16-28 high-hardness pulp in press master with the hardness that obtains after the boiling.
14, claim 1 or 2 described brown stocks are in preparation newsprint, supercalendered paper, wrapping paper, paper diaper, crepe toilet paper, tissue, face tissue, napkin paper, tissue, the application in paper for kitchen, writing paper, offset paper, offset printing paper, single face writing paper, M.G.offset paper and the corrugated paper.
15, claim 1 or the 2 described brown stocks application in the preparation moulded paper pulp product, described goods comprise: bowl, basin, cup, bucket, dish, dish, pallet and cutlery box; Carriage, electric welding protective cover, Indoor decorative plate, molding flowerpot, molding seedling-raising cup, molding slippers and adsorptive pads toilet seat cushion; Molding medical tray container, molding medical nursing product and disposable medical vessel.
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