CN101089291A - Prepared bleach chemical pulp using grass kind plant as raw material and preparation method thereof - Google Patents
Prepared bleach chemical pulp using grass kind plant as raw material and preparation method thereof Download PDFInfo
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Abstract
The present invention discloses a bleached chemical pulp prepared by using graminoid plant as raw material and its preparation method. Said invention is characterized by that it utilizes a high-hardness pulp which is obtained by using cooking process and whose permanganate number is 16-28 and equal to Kappa number 26-50 and makes said high-hardness pulp undergo the processes of pulp-washing and bleaching treatment so as to obtain the invented bleached chemical pulp whose breaking length is 4500-8000 m and folding endurance is 20-70 times.
Description
Technical field
The present invention relates to a kind of paper pulp and preparation method thereof, more particularly, the present invention be a kind of be the bleach chemical pulp and preparation method thereof of feedstock production with the grass kind plant.
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 goes out 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, drainability reduces the recovery of black liquor; 2. the characteristic of grass fiber delignification.Owing to have more alkali that easy molten lignin is arranged in the grass fiber, its slurrying difficulty is reduced, but it requires 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. grass contains a large amount of heteroproteose cells in now being, papermaking is formed a series of harm.5. the bleachability of straw pulp is good than timber, easily adopts short flow process, and chlorine-free bleaching reaches high whiteness.
The rice wheat straw 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.
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 etc.The forest reserves of China lack, and the main raw material that is used for papermaking is a grass as raw material.Generally speaking, as paper making raw material, wood raw material is better than grass as raw material, and needlebush is better than leaf wood again in the wood raw material.Under the serious situation that China's Forest Resources lacks day by day, how utilizing grass as raw material to prepare high-quality paper pulp is present urgent problem.
Summary of the invention
The object of the present invention is to provide a kind of is the bleach chemical pulp of feedstock production with the grass kind plant.
Another object of the present invention is to provide a kind of is the preparation method of the bleach chemical pulp of raw material with the grass kind plant.
To achieve these goals, the technical solution used in the present invention is:
A kind of is the bleach chemical pulp of feedstock production with the grass kind plant, and described bleach chemical pulp is feedstock production with the grass kind plant, and the fracture length of described bleach chemical pulp is a 4500-8000 rice, and folding strength is 20-70 time.
The preferred fracture length of described bleach chemical pulp is a 5500-8000 rice, and folding strength is 35-60 time.
Grass kind plant of the present invention is one or more the combination in straw, wheat straw, cotton stalk, bagasse or the reed.
A kind of method for preparing the grass bleach chemical pulp, the step that comprises boiling, washing and bleaching, it is characterized in that described boiling is a kind of in ammonium sulfite boiling, anthraquinone-soda cooking and the kraft cooking, the hardness of the high-hardness pulp of gained is equivalent to card primary valency 26-50 for permanganate number 16-28 after the boiling.
Described ammonium sulfite comprises the steps:
(1) adding is to the ammonium sulfite solution of over dry material quantity 9-13% in the grass kind plant raw material, and wherein liquor ratio is 1: 2-4;
(2) feed steam and heat, heat temperature raising is incubated 20-40 minute when temperature is 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
Described anthraquinone-soda processes comprises the steps:
(1) adding is to the sodium hydroxide solution of over dry material quantity 9-12% in the grass kind plant raw material, and wherein liquor ratio is 1: 2-4, and 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 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
Described sulfate process comprises the steps:
(1) adding is to the sodium hydroxide solution of over dry material quantity 8-11% in the grass kind plant raw material, and wherein liquor ratio is 1: 2-4, sulphidity are 5-15%;
(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.
After boiling, the press master of before the washing resulting high-hardness pulp being used with extraction black liquor in the prior art carries out shove in the method for the present invention.
Shove of the present invention comprises the first road acroll press washer shove and the second road acroll press washer shove.
Bleaching of the present invention comprises oxygen-alkali bleaching, and described oxygen-alkali bleaching is: the addition at NaOH is the 2-4% of oven dry stock weight, and the addition of oxygen is bleaching 75-90 minute under the condition of 20-40kg slurry per ton.
Bleach chemical pulp described in the present invention is meant that whiteness is 68-82%ISO, and the delignification rate is the chemical pulp of 84-98%.
Specifically, a kind of is the bleach chemical pulp of feedstock production with the grass kind plant, and described bleach chemical pulp is feedstock production with the grass kind plant, and the fracture length of described bleach chemical pulp is a 4500-8000 rice, and folding strength is 20-70 time.The preferred fracture length of described bleach chemical pulp is a 5500-8000 rice, and folding strength is 35-60 time.
Bleach chemical pulp of the present invention is a feedstock production with the grass kind plant, and its fracture length reaches more than 5500 meters, folding strength reaches more than 25 times, beating degree is 25-36 ° of SR, is a kind of high-quality chemical pulp, can be used as the slurry that the high-quality cultural paper is produced in preparation.And raw material used among the present invention is a grass kind plant, comprises straw, wheat straw, cotton stalk, bagasse, reed etc., and these raw materials are very abundant, and price is low.Bleach chemical pulp described in the present invention can be copied into general cultural paper, because the function admirable of itself, therefore when the higher-quality paper of preparation, compared with prior art, can use with wood pulp collocation still less,, alleviate the contradiction between high-quality paper demand and the timber resources shortage greatly therefore in today that the forest reserves lack day by day, simultaneously also reduced the production cost of enterprise, for enterprise brings good economic benefit.
In the method for the invention, at first can adopt prior art that raw material is got the raw materials ready, promptly adopt conventional dried, wet feed preparation,, can alleviate the pressure of subsequent technique like this, and improve the quality of straw pulp to remove impurity such as defoliation, fringe, grain, marrow.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.Fibers in grass class raw material through the removal moisture after getting the raw materials ready also can be fine fodder, and the moisture of deduction dogstail 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.
Then raw material is carried out impregnation process, maceration extract is flooded the fibers in grass class 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 raw material, make the dipping of raw material evenly complete.Described maceration extract can be certain density aqueous slkali, as being 4% sodium hydroxide solution, also can be the mixed liquor of alkali and black liquor to the over dry material quantity, 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 digestion process is prepared.
Ensuing digestion process is the committed step of slurrying, because institutional framework, microstructure, chemical composition and the lignin molecular structure etc. of timber and grass as raw material are all variant, therefore, the delignification reaction course also has very big difference in digestion process.For grass as raw material alkaline cooking delignification reaction course, comprise intensification and be incubated two sections.The common feature of grass as raw material is that delignification is more or less freely, and compares with wood raw material, and the temperature of a large amount of strippings of lignin is more in advance.When the grass as raw material sulphate cook, just find the secondary wall lignin, meet born of the same parents subtract the layer and cell angle block element all remove simultaneously at the very start in boiling.Grass as raw material generally contains more hemicellulose and less lignin, and hemicellulose mainly is present in cell and stands like a wall, and this just helps the process of boiling delignification.In the method for the present invention, boiling chemical liquid consumption is few, and the time of boiling and insulation is short, in a large amount of lignins of removing in the grass raw material, has reduced the degraded and the damage of cellulose and hemicellulose as much as possible.Can adopt ammonium sulfite boiling, Arbiso process, anthraquinone-soda processes, sulfate process etc. to carry out boiling in the method for the present invention.
Through the high-hardness pulp of gained after the boiling, hardness is equivalent to card uncle valency 24-50 for permanganate number 16-28 in the method for the present invention; Described high-hardness pulp preferred hardness 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.
High-hardness pulp among the present invention is as the raw material of preparation bleach chemical pulp, and the boiling method of high-hardness pulp can be ammonium sulfite, sulfate process, anthraquinone-soda processes.In the process of the boiling of prior art, this several method exists the time of boiling and insulation long when preparing paper pulp, stewing temperature height, 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%.
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 20-30% 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 the single-screw press master or the Double screw pulp extruder 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 sufficient preparation has been carried out in next step pulp washing and bleaching.Most preferred press master is the press master of spiral reducing varying pitch among the present invention, utilizes reducing varying pitch press master, makes slurry in the space that slowly diminishes, and makes the about dehydration of compressed slurry layer consistent.The acroll press washer 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.
The slurry that will come out from shove through jumping the sieve screening, washs earlier then, can adopt vacuum pulp washing machine or pressure washer to wash.Go out the concentration of starching behind the wash engine between 9-11%, this slurry is delivered to fluffer through conveying worm handle, the button degree of separating of handling the back slurry is 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 bleaching process of back.
To carry out oxygen-alkali bleaching through discongesting gained slurry, described oxygen-alkali bleaching is: the addition at NaOH is the 2-4% of oven dry stock weight, and the addition of oxygen is bleaching 75-90 minute 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 30--36 ° of SR.After oxygen-alkali bleaching, also comprise according to existing method and bleaching, bleach as C-E-H.The condition of bleaching is: chlorination: chlorine dosage is the 2.5-3% of oven dry stock, and the concentration of slurry is 3-3.5%, and the temperature of bleaching is 50-55 ℃, and the time of bleaching is 45-60 minute; The condition of alkali treatment is: the amount that adds NaOH is oven dry stock amount 2-4%, and the concentration of slurry is 10-12%, and bleaching temperature is 50-55 ℃, and the time is 100-150 minute; Hypochlorite bleaching: the addition of clorox is the 2-4% of oven dry stock amount, and the temperature of bleaching is 30-35 ℃, and the time of bleaching is 100-150 minute.Also can directly bleach by above-mentioned C-E-H mode discongesting the gained slurry, bleaching obtains bleach chemical pulp after finishing.
The invention has the beneficial effects as follows: be the bleach chemical pulp of feedstock production with the grass kind plant, beating degree is 25-36 ° of SR, and fracture length is 4500-8000m, and folding number is 20-70, and whiteness is 68-82%ISO, and the delignification rate is 84-98%.Described bleach chemical pulp can be used as the slurry that the high-quality cultural paper is produced in preparation.And raw material used among the present invention is a grass kind plant, comprises straw, wheat straw, cotton stalk, bagasse, reed etc., and these raw materials are very abundant, and price is low.Bleach chemical pulp described in the present invention can be copied into general cultural paper, because the function admirable of itself, therefore when the higher-quality paper of preparation, compared with prior art, can use with wood pulp collocation still less,, alleviate the contradiction between high-quality paper demand and the timber resources shortage greatly therefore in today that the forest reserves lack day by day, simultaneously also reduced the production cost of enterprise, for enterprise brings good economic benefit.Among the preparation method of the present invention,, shorten the time of boiling, prepare the high-hardness pulp of high rigidity 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, high-hardness pulp of the present invention can be used as the raw material of preparation bleach chemical pulp, 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 improved.
The quality index of the wheat straw bleach chemical pulp that the present invention is prepared and broad-leaved slurry and the contrast of common Straw Pulp are as follows:
The specific embodiment
Embodiment 1
With the boiling of wheat straw process ammonium sulfite, be specially pre-preg and adopt 4% sodium hydroxide solution, the ammonium sulfite addition is 10% 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, littler steam bleeding 20-30 minute, post bake heat up 30 minutes to temperature be 168 ℃, be incubated 90 minutes.Slurry after the boiling is through washing, and transferring and obtaining hardness after dense is 20 to be equivalent to card primary valency 31, and beating degree is 22 ° of SR, and concentration is 10% group unbleached chemical 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, floats reaction tower after centrifugal middle underflow pump is transported to oxygen.This slurry mixed with the oxygen of the 20kg slurry per ton that adds and the NaOH of oven dry stock weight 4% in pipeline before entering reaction tower, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters oxygen after fully mixed and floats reaction tower 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 degree, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, this moment, the hardness K (permanganate number) of slurry was reduced to 10, and beating degree is 30 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 3% of an oven dry stock, and the concentration of slurry is 3.2%, and the temperature of bleaching is 55 ℃, and the time of bleaching is 45 minutes; The amount that the E section adds NaOH is an oven dry stock amount 2.5%, and the concentration of slurry is 12%, and bleaching temperature is 50 ℃, and the time is 120 minutes; The addition of H section clorox is 3% of an oven dry stock amount, and the temperature of bleaching is 30 ℃, and the time of bleaching is 120 minutes, and can obtain whiteness is 82%ISO, 6500 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 45 times.
Embodiment 2
With the boiling of straw process caustic soda-anthraquinone method, being specially the caustic soda addition is 10% of over dry material quantity, the anthraquinone addition is 0.7% 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, littler steam bleeding 20-30 minute, for the second time heat temperature raising 30 minutes to temperature is 168 ℃, is incubated 90 minutes.Slurry after the boiling is through washing, and transferring and obtaining hardness after dense is 22 to be equivalent to card primary valency 36, and beating degree is 24 ° of SR, and concentration is 12% group unbleached chemical pulp, heats this slurry to 60 ℃ then and is transported to oxygen by the positive displacement middle underflow pump and float reaction tower.This slurry mixed with the oxygen of the 40kg slurry per ton that adds and the NaOH of oven dry stock weight 2% in pipeline before entering reaction tower, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters oxygen after fully mixed and floats reaction tower in blender afterwards, inlet temperature 100 degree, and pressure 1.2Mpa stops in 90 minutes and makes this slurry can carry out sufficient delignification reaction, and tower top temperature is 105 to spend, and pressure remains 0.2MPa.After finishing dealing with this slurry is spurted stock tank and dilution, the hardness K (permanganate number) that starches this moment is reduced to 14 and is equivalent to card uncle valency 19, and beating degree is 28 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 4% of an oven dry stock, and the concentration of slurry is 3%, and the temperature of bleaching is 55 ℃, and the time of bleaching is 50 minutes; The amount that the E section adds NaOH is an oven dry stock amount 2%, and the concentration of slurry is 12%, and bleaching temperature is 52 ℃, and the time is 100 minutes; The addition of H section clorox is 3% of an oven dry stock amount, and the temperature of bleaching is 32 ℃, and the time of bleaching is 100 minutes, and can obtain whiteness is 74%ISO, 5500 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 35 times.
Embodiment 3
After wheat straw and reed mixed according to 1: 1 through the ammonium sulfite boiling, be specially the sodium hydroxide solution hybrid infusion of using over dry raw material 4%, send into rotary spherical digester then, adding is to the ammonium sulfite of over dry material quantity 11.5%, liquor ratio 1: 3, heat temperature raising to 100 ℃ for the first time, insulation is 20 minutes under this temperature, again little steam bleeding 20-30 minute, for the second time heat temperature raising 30 minutes to temperature was 165 ℃, is incubated 60 minutes.Slurry after the boiling carries out shove through the single-screw press master earlier, wash after the shove, obtain hardness and be 18 and be equivalent to card primary valency 27, beating degree is 26 ° of SR, concentration is 10% group unbleached chemical pulp, heats this slurry to 76 ℃ then and is transported to oxygen through the positive displacement middle underflow pump and float reaction tower.This slurry mixed with the oxygen of the 30kg slurry per ton that adds and the NaOH of oven dry stock weight 3% in pipeline before entering reaction tower, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters oxygen after fully mixed and floats reaction tower in blender afterwards; protective agent is a magnesium sulfate; addition is 0.2% of an oven dry stock weight; inlet temperature 98 degree; pressure 1.0Mpa; stop in 80 minutes and make this slurry can carry out sufficient delignification reaction, tower top temperature is 102 degree, and pressure remains 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, this moment, the hardness K (permanganate number) of slurry was reduced to 13, and beating degree is 32 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 4% of an oven dry stock, and the concentration of slurry is 3.5%, and the temperature of bleaching is 50 ℃, and the time of bleaching is 50 minutes; The amount that the E section adds NaOH is an oven dry stock amount 3%, and the concentration of slurry is 10%, and bleaching temperature is 52 ℃, and the time is 150 minutes; The addition of H section clorox is 2% of an oven dry stock amount, and the temperature of bleaching is 32 ℃, and the time of bleaching is 150 minutes, and can obtain whiteness is 80%ISO, 7000 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 50 times.
Embodiment 4
Through the cotton stalk process dipping screw machine behind the dry raw material preparation, in the dipping screw machine with the sodium hydroxide solution mixed liquor hybrid infusion that to the cotton stalk amount of over dry is 4%, send into rotary spherical digester then, adding adds ammonium sulfite to over dry material quantity 12% in the rotary spherical digester to the over dry material quantity, liquor ratio 1: 2.5, cotton stalk are filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 120 ℃, and insulation is 40 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 173 ℃, be incubated 90 minutes; Before spurting, in rotary spherical digester, add black liquor and dilute, pressure keeps 0.75MPa to spurt simultaneously, and this moment, the hardness of slurry was that permanganate number 16 is equivalent to card uncle valency 24, and the pH value is 12 during boiling end, and the residual ammonium concentration in the black liquor is 9g/l.The yield of described high-hardness pulp is 66%.With boiling intact after the hardness of gained be that the high-hardness pulp that permanganate number 23 is equivalent to card uncle valency 37 washs with pressure washer, after the washing high-hardness pulp is diluted with clear water, being diluted to concentration is 5-12%, bleach, at first carrying out oxygen floats, its oxygen addition is the 2-5% of oven dry stock amount, the addition of NaOH is the 2-6% of oven dry stock amount, add magnesium sulfate salt and make protective agent, the temperature that oxygen floats is 90-110 ℃, after one section oxygen floats end, repeating oxygen in an identical manner floats once, oxygen floats after the end, bleaches chlorination-alkali treatment-hypochlorite bleaching again in more traditional mode, the condition of bleaching is: chlorine dosage is the 2.5-3% of oven dry stock, the concentration of slurry is 3-3.5, and the temperature of bleaching is 50-55 ℃, and the time of bleaching is 45-60 minute; The condition of alkali treatment is: the amount that adds NaOH is oven dry stock amount 2-4%, and the concentration of slurry is 10-12%, and bleaching temperature is 50-55 ℃, and the time is 100-150 minute; Hypochlorite bleaching: the addition of clorox is the 2-4% of oven dry stock amount, and the temperature of bleaching is 30-35 ℃, and the time of bleaching is 100-150 minute.After bleaching finished, the whiteness of paper pulp was 72%ISO, and fracture length is 8000m, and folding strength is 70 times, is a kind of high-quality slurry.
Embodiment 5
Straw is carried out anthraquinone-soda cooking: add the NaOH to over dry material quantity 9%, wherein liquor ratio is 1: 2, and the anthraquinone addition is 0.6% of an over dry material quantity; Feed steam and heat, little steam bleeding is carried out in heat temperature raising insulation 20 minutes when temperature is 120 ℃, continues heat temperature raising to 165 ℃, be incubated 60 minutes, obtains hardness and is 28 and be equivalent to the high-hardness pulp of card primary valency 50.Earlier carry out shove with the single-screw press master, through shove black liquor is extruded, impurity in the black liquor is also discharged together in company with black liquor simultaneously, slurry with gained washs with suction washer afterwards, after the washing high-hardness pulp being diluted to concentration is 8-12%, bleach then, at first carrying out oxygen floats, its oxygen addition is the 2-5% of oven dry stock amount, and the addition of NaOH is the 2-6% of oven dry stock amount, adds magnesium sulfate salt and makes protective agent, the temperature that oxygen floats is 90-110 ℃, after one section oxygen floats end, bleach chlorination-alkali treatment-hypochlorite bleaching again in more traditional mode, the condition of bleaching is: chlorine dosage is the 2.5-3% of oven dry stock, the concentration of slurry is 3-3.5%, and the temperature of bleaching is 50-55 ℃, and the time of bleaching is 45-60 minute; The condition of alkali treatment is: the amount that adds NaOH is oven dry stock amount 2-4%, and the concentration of slurry is 10-12%, and bleaching temperature is 50-55 ℃, and the time is 100-150 minute; Hypochlorite bleaching: the addition of clorox is the 2-4% of oven dry stock amount, and the temperature of bleaching is 30-35 ℃, and the time of bleaching is 100-150 minute.After bleaching finished, the whiteness of paper pulp was 75%ISO, and fracture length is 4500m, and folding strength 20 times is a kind of high-quality slurry.
Embodiment 6
Reed is carried out anthraquinone-soda cooking: add the sodium hydroxide solution to over dry material quantity 9%, wherein liquor ratio is 1: 2, and the anthraquinone addition is 0.6% of an over dry material quantity; Feed steam and heat, little steam bleeding is carried out in heat temperature raising insulation 20 minutes when temperature is 115 ℃, continues heat temperature raising to 165 ℃, is incubated 60 minutes.The hardness of the intact gained afterwards of boiling is carried out shove with the first road single-screw press master earlier for the high-hardness pulp that permanganate number 18-20 is equivalent to card uncle valency 29-33, through shove black liquor is extruded, impurity in the black liquor is also discharged together in company with black liquor simultaneously, enter the second road single-screw press master again and carry out shove, slurry with gained washs with pressure washer afterwards, after the washing high-hardness pulp is diluted, being diluted to concentration is 5-12%, bleach, at first carrying out oxygen floats, its oxygen addition is the 2-5% of oven dry stock amount, and the addition of NaOH is the 2-6% of oven dry stock amount, adds magnesium sulfate salt and makes protective agent, the temperature that oxygen floats is 90-110 ℃, after one section oxygen floats end, bleach chlorination-alkali treatment-hypochlorite bleaching again in more traditional mode, the condition of bleaching is: chlorine dosage is the 2.5-3% of oven dry stock, the concentration of slurry is 3-3.5, and the temperature of bleaching is 50-55 ℃, and the time of bleaching is 45-60 minute; The condition of alkali treatment is: the amount that adds NaOH is oven dry stock amount 2-4%, and the concentration of slurry is 10-12%, and bleaching temperature is 50-55 ℃, and the time is 100-150 minute; Hypochlorite bleaching: the addition of clorox is the 2-4% of oven dry stock amount, and the temperature of bleaching is 30-35 ℃, and the time of bleaching is 100-150 minute.After bleaching finished, the whiteness of paper pulp was 72%ISO, and fracture length is 5500m, and folding strength is 40 times, is a kind of high-quality slurry.
Embodiment 7
Straw is carried out the Arbiso process boiling, in straw, add total acid 5%, the cooking liquor of combined acid 2%; Feed steam in the boiling vessel and heat, little steam bleeding is carried out in heat temperature raising insulation 30 minutes when temperature is 110 ℃, continues heat temperature raising to 170 ℃, is incubated 60 minutes, and obtaining hardness is that permanganate number is 24.Described high-hardness pulp carries out shove with the single-screw press master earlier, through shove black liquor is extruded, impurity in the black liquor is also discharged together in company with black liquor simultaneously, slurry with gained washs with suction washer afterwards, after the washing high-hardness pulp is diluted, being diluted to concentration is 8-12%, bleach, at first carry out oxygen and float, its oxygen addition is the 2-5% of oven dry stock amount, the addition of NaOH is the 2-6% of oven dry stock amount, add magnesium sulfate salt and make protective agent, the temperature that oxygen floats is 90-110 ℃, after one section oxygen floats end, bleach in more traditional mode again, chlorination-alkali treatment-hypochlorite bleaching, the condition of bleaching is: chlorine dosage is the 2.5-3% of oven dry stock, the concentration of slurry is 3-3.5, the temperature of bleaching is 50-55 ℃, and the time of bleaching is 45-60 minute; The condition of alkali treatment is: the amount that adds NaOH is oven dry stock amount 2-4%, and the concentration of slurry is 10-12%, and bleaching temperature is 50-55 ℃, and the time is 100-150 minute; Hypochlorite bleaching: the addition of clorox is the 2-4% of oven dry stock amount, and the temperature of bleaching is 30-35 ℃, and the time of bleaching is 100-150 minute.After bleaching finished, the whiteness of paper pulp was 78%ISO, and fracture length is 6400m, and folding strength is 35 times, is a kind of high-quality paper pulp.
Embodiment 8
Straw and bagasse were mixed after the persulfuric acid bisulfite cooking according to 1: 1, be specially sodium hydroxide solution and the black liquor mixed liquor hybrid infusion used over dry material quantity 4%, send into rotary spherical digester then, add the soda bath to over dry material quantity 12%, sulphidity is 10%, liquor ratio 1: 2.5, heat temperature raising to 140 ℃ for the first time, insulation is 40 minutes under this temperature, littler steam bleeding 20-30 minute, for the second time heat temperature raising 30 minutes to temperature is 173 ℃, is incubated 90 minutes.Slurry after the boiling is through washing, and transferring and obtaining hardness after dense is 28 to be equivalent to card primary valency 50, and beating degree is 20 ° of SR, and concentration is 25% group unbleached chemical pulp, heats this slurry to 80 ℃ 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, floats reaction tower after centrifugal high density stock pump is transported to first oxygen.Adding the oxygen of 5kg slurry per ton and the NaOH of oven dry stock weight 2% in the reaction tower mixes; and feeding steam should be starched heat temperature raising in pipeline; this slurry enters this first oxygen after fully mixed and floats reaction tower in blender afterwards; protective agent is a magnesium sulfate, and addition is 0.2% of an oven dry stock weight, inlet temperature 90 degree; pressure 1.0Mpa; stopped 30 minutes, tower top temperature is 100 degree, and pressure remains 0.2MPa.Again this stock pump is gone into second oxygen and float tower, add the NaOH of the oxygen of 5kg slurry per ton and oven dry stock weight 0.5% and in pipeline, feed steam and should starch heat temperature raising.This slurry enters second oxygen after fully mixed and floats reaction tower in blender, inlet temperature 100 degree, pressure 0.6Mpa, stopped 20 minutes, tower top temperature is 110 degree, and pressure remains 0.4MPa, and this slurry is spurted stock tank and dilution, this moment, the hardness K (permanganate number) of slurry was reduced to 12, and beating degree is 34 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 3% of an oven dry stock, and the concentration of slurry is 3.5%, and the temperature of bleaching is 52 ℃, and the time of bleaching is 45 minutes; The amount that the E section adds NaOH is an oven dry stock amount 3%, and the concentration of slurry is 11%, and bleaching temperature is 50 ℃, and the time is 150 minutes; The addition of H section clorox is 2.5% of an oven dry stock amount, and the temperature of bleaching is 30 ℃, and the time of bleaching is 150 minutes, and can obtain whiteness is 78%ISO, fracture length 6500m, the high-quality dogstail slurry that folding strength is 44 times.
Embodiment 9
After wheat straw, cotton stalk and bagasse mixed according to 1: 1: 1 through ammonium sulfite-anthraquinone boiling, be specially the ammonium sulfite solution that adds in the rotary spherical digester over dry material quantity 13%, the anthraquinone addition is 0.8% of an over dry material quantity, liquor ratio 1: 3, heat temperature raising to 100 ℃ for the first time, insulation is 20 minutes under this temperature, littler steam bleeding 20-30 minute, for the second time heat temperature raising 30 minutes to temperature is 165 ℃, is incubated 60 minutes.Slurry after the boiling is through washing, transferring and obtaining hardness after dense is 26 to be equivalent to card uncle valency 45, beating degree is 22 ° of SR, and concentration is 20% group unbleached chemical pulp, heats this slurry to 70 ℃ then and is transported to through single rotor formula high density stock pump that oxygen floats reaction tower and feed steam in pipeline should starch heat temperature raising.Add the oxygen of 15kg slurry per ton and the NaOH of oven dry stock weight 2.5% in the reaction tower; protective agent is a magnesium sulfate; addition is 0.5% of an oven dry stock weight; inlet temperature 100 degree; pressure 1.1Mpa; stop in 60 minutes and make this slurry can carry out sufficient delignification reaction, tower top temperature is 110 degree, and pressure remains 0.5MPa.After finishing dealing with this slurry is spurted stock tank and dilution, the hardness K (permanganate number) that starches this moment is reduced to 10 and is equivalent to card uncle valency 13, and beating degree is 36 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 3% of an oven dry stock, and the concentration of slurry is 3%, and the temperature of bleaching is 52 ℃, and the time of bleaching is 50 minutes; The amount that the E section adds NaOH is an oven dry stock amount 3%, and the concentration of slurry is 12%, and bleaching temperature is 50 ℃, and the time is 100 minutes; The addition of H section clorox is 2.5% of an oven dry stock amount, and the temperature of bleaching is 32 ℃, and the time of bleaching is 150 minutes, and can obtain whiteness is 78%ISO, 6300 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 42 times.
Embodiment 10
Straw, bagasse and reed were mixed after the persulfuric acid bisulfite cooking according to 1: 1: 1, be specially in the dipping screw machine with to the sodium hydroxide solution and the black liquor mixed liquor hybrid infusion of over dry material quantity 4%, send into rotary spherical digester then, add soda bath in the rotary spherical digester to over dry material quantity 9%, sulphidity is 15%, liquor ratio 1: 3, afterwards, logical steam carries out the heat temperature raising first time, is warming up to 120 ℃, and insulation is 20 minutes under this temperature, again little steam bleeding 20-30 minute, heating for the second time begins logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 60 minutes.Slurry after the boiling is through washing, and transferring and obtaining hardness after dense is 22 to be equivalent to card primary valency 35, and beating degree is 24 ° of SR, and concentration is 23% group unbleached chemical pulp, heats this slurry to 80 ℃ then and is transported to oxygen through the positive displacement high density stock pump and float reaction tower.Add the oxygen of 35kg slurry per ton and the NaOH of oven dry stock weight 3% in the reaction tower, and feeding steam should be starched heat temperature raising in pipeline.Protective agent is a magnesium sulfate, and addition is 0.8% of an oven dry stock weight, inlet temperature 100 degree, and pressure 0.9Mpa stops in 55 minutes and makes this slurry can carry out sufficient delignification reaction, and tower top temperature is 108 to spend, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, the hardness K (permanganate number) that starches this moment is reduced to 10 and is equivalent to card uncle valency 13, and beating degree is 38 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 4% of an oven dry stock, and the concentration of slurry is 3.2%, and the temperature of bleaching is 50 ℃, and the time of bleaching is 45 minutes; The amount that the E section adds NaOH is an oven dry stock amount 3%, and the concentration of slurry is 12%, and bleaching temperature is 52 ℃, and the time is 120 minutes; The addition of H section clorox is 2% of an oven dry stock amount, and the temperature of bleaching is 30 ℃, and the time of bleaching is 150 minutes, and can obtain whiteness is 81%ISO, 6800 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 46 times.
Embodiment 11
Bagasse through the ammonium sulfite boiling, is specially the ammonium sulfite solution that adds in the rotary spherical digester over dry material quantity 11%, and liquor ratio 1: 4 is filled the back rotary spherical digester and was dallied 20 minutes; Afterwards, logical steam carries out the heat temperature raising first time, is warming up to 110 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, heating for the second time began logical steam, heat up 30 minutes to temperature be 168 ℃, be incubated 90 minutes.Slurry after the boiling is through washing, and transferring and obtaining hardness after dense is 20 to be equivalent to card primary valency 31, and beating degree is 26 ° of SR, and concentration is 12% group unbleached chemical pulp, heats this slurry to 60 ℃ 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, floats reaction tower after centrifugal middle underflow pump is transported to oxygen.This slurry mixed with the oxygen of the 40kg slurry per ton that adds and the NaOH of oven dry stock weight 4% in pipeline before entering reaction tower, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters oxygen after fully mixed and floats reaction tower in blender afterwards, inlet temperature 100 degree, and pressure 1.2Mpa stops in 90 minutes and makes this slurry can carry out sufficient delignification reaction, and tower top temperature is 105 to spend, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, the hardness K (permanganate number) that starches this moment is reduced to 8 and is equivalent to card uncle valency 10, and beating degree is 40 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 5% of an oven dry stock, and the concentration of slurry is 3.5%, and the temperature of bleaching is 52 ℃, and the time of bleaching is 50 minutes; The amount that the E section adds NaOH is an oven dry stock amount 2%, and the concentration of slurry is 10%, and bleaching temperature is 55 ℃, and the time is 150 minutes; The addition of H section clorox is 2.5% of an oven dry stock amount, and the temperature of bleaching is 32 ℃, and the time of bleaching is 100 minutes, and can obtain whiteness is 77%ISO, 5500 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 35 times.
Claims (10)
1, a kind of is the bleach chemical pulp of feedstock production with the grass kind plant, it is characterized in that, described bleach chemical pulp is feedstock production with the grass kind plant, and the fracture length of described bleach chemical pulp is a 4500-8000 rice, and folding strength is 20-70 time.
2, bleach chemical pulp according to claim 1 is characterized in that, the fracture length of described bleach chemical pulp is a 5500-8000 rice, and folding strength is 35-60 time.
According to claim 1 or 2 or described bleach chemical pulp, it is characterized in that 3, described grass kind plant is one or more the combination in straw, wheat straw, cotton stalk, bagasse or the reed.
4, a kind of method for preparing the bleach chemical pulp of claim 1 or 2, the step that comprises boiling, washing and bleaching, it is characterized in that, described boiling is a kind of in ammonium sulfite boiling, anthraquinone-soda cooking and the kraft cooking, and the hardness of the high-hardness pulp of gained is permanganate number 16-28 after the boiling.
5, method according to claim 4 is characterized in that, described ammonium sulfite comprises the steps: that (1) adds the ammonium sulfite solution to over dry material quantity 9-13% in the grass kind plant raw material, and wherein liquor ratio is 1: 2-4;
(2) feed steam and heat, heat temperature raising is incubated 20-40 minute when temperature is 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
6, method according to claim 4 is characterized in that, described anthraquinone-soda processes comprises the steps:
(1) adding is to the sodium hydroxide solution of over dry material quantity 9-12% in the grass kind plant raw material, and wherein liquor ratio is 1: 2-4, and 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 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
7, method according to claim 4 is characterized in that, described sulfate process comprises the steps:
(1) adding is to the sodium hydroxide solution of over dry material quantity 8-11% in the grass kind plant raw material, and wherein liquor ratio is 1: 2-4, sulphidity are 5-15%;
(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.
8, method according to claim 4 is characterized in that, after boiling, the press master of before the washing resulting high-hardness pulp being used with extraction black liquor in the prior art carries out shove.
9, method according to claim 8 is characterized in that, described shove comprises the first road acroll press washer shove and the second road acroll press washer shove.
10, method according to claim 4, it is characterized in that described bleaching comprises oxygen-alkali bleaching, described oxygen-alkali bleaching is: the addition at NaOH is the 2-4% of oven dry stock weight, and the addition of oxygen is bleaching 75-90 minute under the condition of 20-40kg slurry per ton.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009015555A1 (en) * | 2007-07-27 | 2009-02-05 | Shandong Tralin Paper Co., Ltd | Grass paper pulp used by papermaking and preparation method thereof |
| WO2009015556A1 (en) * | 2007-07-27 | 2009-02-05 | Shandong Tralin Paper Co., Ltd | Process for producing paper-making pulps from grasses and pulps obtained by the process |
| WO2009070955A1 (en) * | 2007-12-05 | 2009-06-11 | Shandong Fuyin Paper & Environmental Protection Technology Co., Ltd | Grass type unbleached paper products and production method thereof |
| CN101220565B (en) * | 2008-01-30 | 2010-09-29 | 晏永祥 | Pulping method with zero discharge of sewage water |
| CN105178083A (en) * | 2014-06-08 | 2015-12-23 | 蒋寿悟 | Pulping method with zero discharge of sewage |
| CN109487610A (en) * | 2018-12-26 | 2019-03-19 | 广西粤桂广业控股股份有限公司 | A kind of method of the direct pulping by cooking of fresh bagasse |
| CN115110328A (en) * | 2022-07-07 | 2022-09-27 | 南京工业大学 | Non-wood paper pulp micro-nano bubble bleaching device and method |
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- 2007-08-03 CN CNB2007101431298A patent/CN100402745C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009015555A1 (en) * | 2007-07-27 | 2009-02-05 | Shandong Tralin Paper Co., Ltd | Grass paper pulp used by papermaking and preparation method thereof |
| WO2009015556A1 (en) * | 2007-07-27 | 2009-02-05 | Shandong Tralin Paper Co., Ltd | Process for producing paper-making pulps from grasses and pulps obtained by the process |
| WO2009070955A1 (en) * | 2007-12-05 | 2009-06-11 | Shandong Fuyin Paper & Environmental Protection Technology Co., Ltd | Grass type unbleached paper products and production method thereof |
| US8303772B2 (en) | 2007-12-05 | 2012-11-06 | Shangdong Fuyin Paper & Environmental Protection Technology Co., Ltd. | Method for preparing a grass-type unbleached paper product |
| CN101220565B (en) * | 2008-01-30 | 2010-09-29 | 晏永祥 | Pulping method with zero discharge of sewage water |
| CN105178083A (en) * | 2014-06-08 | 2015-12-23 | 蒋寿悟 | Pulping method with zero discharge of sewage |
| CN109487610A (en) * | 2018-12-26 | 2019-03-19 | 广西粤桂广业控股股份有限公司 | A kind of method of the direct pulping by cooking of fresh bagasse |
| CN115110328A (en) * | 2022-07-07 | 2022-09-27 | 南京工业大学 | Non-wood paper pulp micro-nano bubble bleaching device and method |
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Denomination of invention: Prepared bleach chemical pulp using grass kind plant as raw material and preparation method thereof Effective date of registration: 20140211 Granted publication date: 20080716 Pledgee: China Development Bank Co Pledgor: Shandong Quanlin Paper Industry Co. Ltd.|Shandong Fuyin Paper Environmental Technology Co. Ltd. Registration number: 2014990000101 |
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