CN101353868B - Alkaline process cooking method for preparing high-hardness pulp from gramineae plants - Google Patents

Alkaline process cooking method for preparing high-hardness pulp from gramineae plants Download PDF

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CN101353868B
CN101353868B CN2008100978945A CN200810097894A CN101353868B CN 101353868 B CN101353868 B CN 101353868B CN 2008100978945 A CN2008100978945 A CN 2008100978945A CN 200810097894 A CN200810097894 A CN 200810097894A CN 101353868 B CN101353868 B CN 101353868B
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hardness
raw material
pulp
bleaching
minute
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CN101353868A (en
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李洪法
宋明信
陈松涛
杨吉慧
宋建军
赵淑晶
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Shandong Fuyin Paper and Environmental Protection Technology Co Ltd
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Shandong Fuyin Paper and Environmental Protection Technology Co Ltd
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Abstract

The invention discloses a high-hardness pulp prepared by taking a grass plant as a raw material, and a cooking method thereof. The hardness of the high-hardness pulp is 16 to 28 of K value, which equals to 24 to 50 of kappa number. The cooking method comprises the steps that: the raw material of the grass plant is prepared and then conveyed to a digester by entering an impregnating screw; then cooking liquor is added into the digester; the digester is heated to required pressure by the steam and thermal insulation is carried out for a period of the needed time. The cooking method of the invention, which has the advantages of low cooking liquor usage, simple operation and short cooking time, is economical and environment-friendly.

Description

A kind of is the alkaline process cooking method of feedstock production high-hardness pulp with the grass kind plant
The application is dividing an application of one Chinese patent application 200710129635.1
Original application day: on July 27th, 2007
Original applying number: 200710129635.1
The original application denomination of invention: a kind of is the high-hardness pulp and preparation method thereof of feedstock production with the grass kind plant
Technical field
The present invention relates to a kind of high-hardness pulp, more particularly, relating to a kind of is the high-hardness 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.Chemical pulping is by chemical action; Some composition through removing in the plant fiber material makes raw material disassociation pulping; Be a kind of most widely used pulping process, in the chemical method boiling, divide lime method, soda processes, anthraquinone-soda processes, sulfate process, sulfite cooking again.
Sulphite process of the prior art is raw material with the string; Its technical process is at first to get the raw materials ready; The raw material that will carry out pretreated production paper pulp pack into rotary spherical digester, upright pot and connect in the equipment such as (digester, vertical digester, continuous steamers) of steaming; Add chemicalss such as ammonium sulfite again, feed Steam Heating toward rotary spherical digester, upright pot or in even steaming, slightly starched after insulation a period of time.
Because directly logical Steam Heating, chemical reaction fierceness, promptly the chemical reaction of delignification is fierce.Not only there is papermaking to starch desired fiber in the raw material, also contains other components of producing the unwanted hemicellulose of paper pulp, lignin and resin, pectin, starch, tannin, pigment, inorganic compound.When boiling, at first under lower temperature, carry out; At this moment just have lignin to separate with pars fibrosa, when treating that elevated temperature carries out boiling, condensation such as the lignin in the low-temp reaction product, poly-pentose etc. again are attached on the surface of fiber; Be difficult to again eccysis from the fiber; So lack of homogeneity, the screenings of paper pulp are many, the hardness of slurry is high, drainability is poor, need a large amount of water washings to remove the black liquor of heteroproteose cell, hemicellulose, lignin composition, cause the sewage pollution environment; More make and the cost up of producing paper pulp also cause difficulty to the bleaching that goes on foot down.1 ton of paper pulp of the every production of this technology of prior art produces the 10-12 ton, even 18 tons of black liquor, and this black liquor viscosity high (generally when concentration 42% 100 be about 460 centipoises when spending).
At present, most enterprises in pulp and paper industry be faced with all that paper making raw material is in short supply, energy shortage, environmental pollution, paper pulp straw pulp problem of low quality particularly.Along with China's accession to the WTO, the situation that paper industry faces is severe more, and the competition between the enterprise also is growing more intense.How to reduce production costs, reduce and pollute, improving the quality of products to satisfy with paper is the downstream industry of raw material, like industries such as printing, journalism, packing, cigarette, is the problem that the papermaker need consider.Based on above-mentioned factor, make that people have to low-cost, oligosaprobic pulping process are placed high hopes.
A grass type pulping technique is a system engineering; 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: heavily get the raw materials ready silica removal 1.; 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 to be prone to dissolve lignin 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 in the raw material is high, carbohydrate content is high, causes its black liquor viscosity high, and recovery difficult is big.4. grass contains a large amount of heteroproteose cells in being at present, and papermaking is formed a series of harm.5. the bleachability of straw pulp is good than timber, is prone to adopt short flow process, and chlorine-free bleaching reaches high whiteness.
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, and the large usage quantity of ammonium sulfite makes 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 to this special plant fiber material imonium legal system paper pulp of wheat straw, and the hardness of this method is low, and 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 mass 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 superior to grass as raw material, and needlebush is superior to 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
It is the high-hardness pulp that is used for preparing bleach chemical pulp of feedstock production with the grass kind plant that primary and foremost purpose of the present invention is to provide a kind of.Described high-hardness pulp hardness is high, is raw material with the grass kind plant, can be as the raw material of bleach chemical pulp.
Another object of the present invention is to provide a kind of is the boiling method of high-hardness pulp that is used for preparing bleach chemical pulp of feedstock production with the grass kind plant.The used cooking liquor of described boiling method is few, and the time of boiling and insulation is short, is the boiling method of a kind of not only economy but also environmental protection.
To achieve these goals, the technical scheme of the present invention's employing is:
A kind of is the high-hardness pulp of feedstock production with the grass kind plant, and described high-hardness pulp hardness is permanganate number 16-28, and described high-hardness pulp prepares through the method except that organic solvent pulping; Described high-hardness pulp preferred hardness is permanganate number 18-27; Described high-hardness pulp most preferably hardness is permanganate number 20-25.
Described grass kind plant raw material is a kind of in wheat straw, straw, bagasse, cotton stalk, the reed or more than one mixing.
Described high-hardness pulp is used for preparing bleach chemical pulp.
Described method except that organic solvent pulping comprises ammonium sulfite, anthraquinone-soda processes and sulfate process.
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, insulation was 20-40 minute when heat temperature raising to temperature was 100-120 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was 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, insulation was 20-40 minute when heat temperature raising to temperature was 100-120 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was 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, insulation was 20-40 minute when heat temperature raising to temperature was 110-140 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was incubated 60-90 minute.
Described Arbiso process comprises the steps:
(1) in the grass kind plant raw material, adds total acid greater than 4%, the cooking liquor of combined acid 1.0-3.0%;
(2) feed steam in the boiling vessel and heat, insulation was 20-40 minute when heat temperature raising to temperature was 100-120 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was incubated 60-90 minute.
Described step also comprises the process that the grass kind plant raw material is flooded in (1).
When heat temperature raising, described grass kind plant raw material is placed in the boiling vessel, described boiling vessel comprises rotary spherical digester, vertical digester and continuous steamer.
The yield of the resulting high-hardness pulp of described boiling method is 58-68%.
Boiling vessel of the present invention comprises rotary spherical digester, vertical digester and continuous steamer.
Specifically, of the present invention a kind of be the high-hardness pulp that is used for preparing bleach chemical pulp of feedstock production with the grass kind plant, described high-hardness pulp hardness is equivalent to card uncle valency 24-50 for permanganate number 16-28; 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.
Grass kind plant raw material of the present invention is a kind of in wheat straw, straw, bagasse, cotton stalk, the reed or more than one combination.
Boiling method described in the present invention is a kind of in ammonium sulfite boiling, anthraquinone-soda processes, the sulfate process.
Ammonium sulfite boiling of the present invention comprises the steps:
(1) the grass kind plant raw material is got the raw materials ready after, deliver in the boiling vessel, add ammonium sulfite solution to over dry material quantity 9-13%, wherein liquor ratio is 1: 2-4;
(2) feed steam in the boiling vessel and heat, heat temperature raising to temperature is 100-120 ℃, and pressure is to be incubated 20-40 minute constantly about 0.4MPa; Carry out little steam bleeding pressure and reduce to 0.02MPa; Continue heat temperature raising to 165-173 ℃, pressure is about 0.75MPa, is incubated 60-90 minute.
Anthraquinone-soda cooking of the present invention comprises the steps:
(1) the grass kind plant raw material is got the raw materials ready after, deliver in the boiling vessel, add sodium hydroxide solution to over dry material quantity 9-12%, the anthraquinone addition is the 0.5-0.8% of over dry material quantity, wherein liquor ratio is 1: 2-4;
(2) feed steam in the boiling vessel and heat, heat temperature raising to temperature is 100-120 ℃, pressure insulation 20-40 minute during for 0.4MPa; Carry out little steam bleeding pressure and reduce to 0.02MPa; Continue heat temperature raising to 165-173 ℃, pressure is 0.75MPa, is incubated 60-90 minute.
Kraft cooking of the present invention comprises the steps:
(1) the grass kind plant raw material is got the raw materials ready after, deliver in the boiling vessel, add sodium hydroxide solution to over dry material quantity 8-11%, wherein liquor ratio is 1: 2-4, sulphidity are 5-15%;
(2) feed steam in the boiling vessel and heat, heat temperature raising to temperature is 110-140 ℃, pressure insulation 20-40 minute during for 0.5MPa; Carry out little steam bleeding pressure and reduce to 0.02MPa; Continue heat temperature raising to 165-173 ℃, pressure is 0.75MPa, is incubated 60-90 minute.
Also comprise the process of flooding before in above-mentioned step (1), after the grass kind plant raw material is got the raw materials ready, delivering to boiling vessel through the dipping spiral organ.
Soda pulping process is exactly to utilize the effect of alkali lye, suitably removes the lignin in the raw material, keeps cellulose and hemicellulose as far as possible and is beneficial to copy paper.In fact in digestion process because the effect of high temperature highly basic; Certain chemical change all can take place in the lignin in the raw material, cellulose, hemicellulose and other composition; Receive 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 alkaline pulping method of the present invention; Through 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%.
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%.
At first carry out oxygen and float, its oxygen addition is the 2-5% of oven dry stock amount, and the addition of NaOH is for being 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 with 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%, 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 6200m, is a kind of high-quality paper pulp.
Before raw material is flooded, can adopt prior art that raw material is carried out preliminary treatment, promptly adopt conventional dried, wet feed preparation, to remove impurity such as defoliation, fringe, grain, marrow, 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, like 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.
The mode that the said impregnation process of the present invention adopts is: 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 the dipping preliminary treatment; 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 when heat treated, deviate from are that main black liquid separation is discharged, 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.
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, and stewing temperature is high, 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.
The process of boiling generally comprises three processes: (1) cooking liquor is to the process of raw material internal penetration; (2) alkali lye and raw material play the process that answer chemistry side; (3) process of reactant stripping from raw material.This three process both stage by stage, was almost intersected simultaneously again and was carried out, and according to the needs of different paper pulp, suitably removed lignin and impurity in the raw material, and the adhesion between the fiber is descended, and impelled the frotation pulping.Therefore, the purpose of boiling is to utilize the effect of cooking liquor, suitably removes the lignin in the raw material, keeps cellulose as far as possible and the part hemicellulose is beneficial to copy paper.In digestion process, because the use of thermophilic digestion and chemical steaming soup, certain chemical change all can take place in the lignin in the raw material, cellulose and hemicellulose and other composition, receives in various degree degraded and damage.
Grass described in the present invention is straw, wheat straw, cotton stalk, bagasse, reed.It is that pentosan content is high that the grass fibre chemistry is formed, and generally all about 20%, NaOH extract content is high, and lignin content is all lower, but content of ashes mainly is silica in the ash content than higher.
Because the use of thermophilic digestion and chemical steaming soup, certain chemical change all can take place in the lignin in the raw material, cellulose and hemicellulose and other composition, receives in various degree degraded and damage.To this special pulping raw material of grass kind plant fiber, in the method for the present invention, the chemical steaming soup has been carried out strict control, its concentration is reduced, reduce degraded and damage to the required composition of slurrying such as cellulose, hemicellulose.Simultaneously, in the process of thermophilic digestion, adopt the method reduce temperature retention time as far as possible in the method for the present invention, the time that makes grass kind plant be in high temperature shortens, thereby has reduced the degraded of cellulose and hemicellulose in the grass kind plant raw material.Therefore, protect the required composition of slurrying in the grass kind plant raw material in the method for the present invention to greatest extent, shortened temperature retention time greatly simultaneously, significantly reduced energy consumption.
Beneficial effect of the present invention is: high-hardness pulp of the present invention; With the grass kind plant is raw material, prepares through the method except that organic solvent pulping, in the process of preparation, passes through to reduce the consumption of cooking liquor; Shorten the time of boiling, prepare the high-hardness pulp of high rigidity.The minimizing of chemical liquid consumption and the shortening of digestion time all can reduce the enterprise 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 shorten greatly, thereby on to greatest extent, reduced the loss of needed cellulose and hemicellulose in the paper pulp, the yield of paper pulp is improved.With high-hardness pulp of the present invention is raw material, the preparation bleach chemical pulp, and the whiteness of described bleach chemical pulp is 68-82%ISO, the delignification rate is 84-98%.Use described high-hardness pulp to be the prepared bleach chemical pulp of raw material; Its beating degree is 25-36 ° of SR; Fracture length is 5000-8100m, and folding number is 20-60, and whiteness is 68-82%ISO; The quality of prepared with the grass kind plant the is bleach chemical pulp of feedstock production compares favourably with existing leaf wood paper pulp, even has also surpassed existing leaf wood pulp quality.
The specific embodiment
Embodiment 1
Through the process of the straw behind dry raw material preparation dipping screw machine; In the dipping screw machine, with the sodium hydroxide solution hybrid infusion that to over dry straw amount is 9%, send into rotary spherical digester then, the anthraquinone addition is 0.6% of an over dry material quantity; Liquor ratio 1: 3, straw are filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 100 ℃, and insulation is 30 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 80 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 20 is equivalent to card uncle valency 32, and the pH value is 11 during boiling end, and the residual alkali concn in the black liquor is 12g/l.The yield of prepared high-hardness pulp is 60%.
Embodiment 2
Wheat straw through behind the dry raw material preparation is sent into rotary spherical digester, in rotary spherical digester, adds the soda bath to over dry material quantity 10%, and the anthraquinone addition is 0.7% of an over dry material quantity, liquor ratio 1: 4, and wheat straw is filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 110 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 168 ℃, 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 18 is equivalent to card uncle valency 30, and the pH value is 12 during boiling end, and the residual alkali concn in the black liquor is 12g/l.The yield of prepared high-hardness pulp is 62%.
Embodiment 3
Through the process of the straw behind dry raw material preparation dipping screw machine; In the dipping screw machine be 12% sodium hydroxide solution and black liquor mixed liquor hybrid infusion to over dry straw amount; Send into rotary spherical digester then; The anthraquinone addition is 0.8% of an over dry material quantity, liquor ratio 1: 2.5, and straw is 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 23, and the pH value is 12 during boiling end, and the residual alkali concn in the black liquor is 14g/l.The yield of described high-hardness pulp is 64%.
Embodiment 4
Cotton stalk through behind the dry raw material preparation is sent into rotary spherical digester, in rotary spherical digester, adds the soda bath to over dry material quantity 9%, and the anthraquinone addition is 0.8% of an over dry material quantity, liquor ratio 1: 3, and cotton stalk is filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 100 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 60 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 25 is equivalent to card uncle valency 40, and the pH value is 12.5 during boiling end, and the residual alkali concn in the black liquor is 13.5g/l.The yield of described high-hardness pulp is 58%.
Embodiment 5
Through the process of the wheat straw behind dry raw material preparation dipping screw machine; In the dipping screw machine with the sodium hydroxide solution hybrid infusion that to over dry wheat straw amount is 4%; Send into rotary spherical digester then; Adding adds the ammonium sulfite solution to over dry material quantity 10% to the over dry material quantity in rotary spherical digester, liquor ratio 1: 4, and wheat straw is filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 110 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 168 ℃, 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 18 is equivalent to card uncle valency 30, and the pH value is 12 during boiling end, and the residual ammonium concentration in the black liquor is 8.5g/l.The yield of described high-hardness pulp is 63%.
Embodiment 6
Through the cotton stalk process dipping screw machine behind the dry raw material preparation; In the dipping screw machine with the sodium hydroxide solution and the black liquor mixed liquor hybrid infusion that to the cotton stalk amount of over dry are 4%; Send into rotary spherical digester then; Adding adds the ammonium sulfite solution to over dry material quantity 12% to the over dry material quantity in rotary spherical digester, liquor ratio 1: 2.5, and cotton stalk is 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%.
Embodiment 7
Through the process of the wheat straw behind dry raw material preparation dipping screw machine; In the dipping screw machine with the sodium hydroxide solution and the black liquor mixed liquor hybrid infusion that to over dry wheat straw amount are 4%; Send into rotary spherical digester then, add the over dry material quantity is added the ammonium sulfite solution to over dry material quantity 13% in rotary spherical digester, the anthraquinone addition is 0.8% of an over dry material quantity; Liquor ratio 1: 3, wheat straw are filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 100 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 60 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 25 is equivalent to card uncle valency 44, and the pH value is 12.5 during boiling end, and the residual ammonium concentration in the black liquor is 10g/l.The yield of described high-hardness pulp is 65%.
Embodiment 8
Through the cotton stalk process dipping screw machine behind the dry raw material preparation; In the dipping screw machine with the sodium hydroxide solution and the black liquor mixed liquor hybrid infusion that to the cotton stalk amount of over dry are 4%; Send into rotary spherical digester then, add the over dry material quantity is added the ammonium sulfite solution to over dry material quantity 11.5% in rotary spherical digester, the anthraquinone addition is 0.8% of an over dry material quantity; Liquor ratio 1: 3, 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 100 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 60 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 23 is equivalent to card uncle valency 38, and the pH value is 12.5 during boiling end, and the residual ammonium concentration in the black liquor is 9.6g/l.The yield of described high-hardness pulp is 67%.
Embodiment 9
Through the dipping screw machine, in the dipping screw machine, with the sodium hydroxide solution hybrid infusion that to over dry straw amount is 9%, send into rotary spherical digester then through the straw behind the dry raw material preparation, sulphidity is 5%, liquor ratio 1: 3, and straw is filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 100 ℃, and insulation is 30 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 80 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 28 is equivalent to card uncle valency 50, and the pH value is 11 during boiling end, and the residual alkali concn in the black liquor is 12g/l.The yield of described high-hardness pulp is 61%.
Embodiment 10
Through the dipping screw machine, in the dipping screw machine, with the sodium hydroxide solution hybrid infusion that to over dry wheat straw amount is 10%, send into rotary spherical digester then through the wheat straw behind the dry raw material preparation, sulphidity is 8%, liquor ratio 1: 4, and wheat straw is filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 110 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 168 ℃, 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 19 is equivalent to card uncle valency 30.5, and the pH value is 12 during boiling end, and the residual alkali concn in the black liquor is 12g/l.
Embodiment 11
Through the process of the reed behind dry raw material preparation dipping screw machine; In the dipping screw machine with the sodium hydroxide solution and the black liquor mixed liquor hybrid infusion that to over dry reed amount are 4%; Send into rotary spherical digester then, add the over dry material quantity is added the soda bath to over dry material quantity 12% in rotary spherical digester, sulphidity is 10%; Liquor ratio 1: 2.5, reed are filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 140 ℃, 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 17 is equivalent to card uncle valency 26, and the pH value is 12 during boiling end, and the residual alkali concn in the black liquor is 14g/l.
Embodiment 12
With bagasse process dipping screw machine; In the dipping screw machine be 4% sodium hydroxide solution and black liquor mixed liquor hybrid infusion to the over dry sugarcane quantity of slag; Send into rotary spherical digester then, add the over dry material quantity is added the soda bath to over dry material quantity 9% in rotary spherical digester, sulphidity is 15%; Liquor ratio 1: 3, bagasse 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 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 60 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 26 is equivalent to card uncle valency 44, and the pH value is 12.5 during boiling end, and the residual alkali concn in the black liquor is 13.5g/l.
Embodiment 13
Through wheat straw behind the dry raw material preparation and straw process dipping screw machine; In the dipping screw machine with the sodium hydroxide solution and the black liquor mixed liquor hybrid infusion that to over dry wheat straw and straw amount are 4%; Send into rotary spherical digester then, add the over dry material quantity is added the soda bath to over dry material quantity 9% in rotary spherical digester, sulphidity is 15%; Liquor ratio 1: 3, wheat straw straw are filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 115 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 60 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 26 is equivalent to card uncle valency 45, and the pH value is 12.5 during boiling end, and the residual alkali concn in the black liquor is 13.5g/l.
Embodiment 14
Through feeding serew, it is steaming mixed to the sodium hydroxide solution and the black liquor mixed liquor of over dry wheat straw amount 13% to get into continuously cooking Guan Zhongyu, liquor ratio 1: 3 through the wheat straw behind the dry and wet stock preparation, wheat straw and cotton stalk; Logical steam is heated to 110 ℃; Be incubated 20 minutes, heated up 30 minutes, after the little steam bleeding; Be warming up to 165 ℃, be incubated 60 minutes; Before spurting; In the intervalve of continuous steamer, add black liquor dilute control starch concentration 8-12%; Keep 0.75MPa to spurt continuously simultaneously; This moment, the hardness of slurry was that permanganate number 24 is equivalent to card uncle valency 42, and the pH value is 11.5 during boiling end, and the residual alkali concn in the black liquor is 11.5g/l.
Embodiment 15
Through the process of the reed behind dry raw material preparation dipping screw machine; In the dipping screw machine with the sodium hydroxide solution and the black liquor mixed liquor hybrid infusion that to over dry reed amount are 4%; Send into rotary spherical digester then, add the over dry material quantity is added the soda bath to over dry material quantity 9% in rotary spherical digester, sulphidity is 15%; Liquor ratio 1: 3, reed are filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 115 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 60 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 26 is equivalent to card uncle valency 46, and the pH value is 12.5 during boiling end, and the residual alkali concn in the black liquor is 13.5g/l.
Embodiment 16
Mix through the dipping screw machine through reed behind the dry raw material preparation and wheat straw; In the dipping screw machine with the sodium hydroxide solution and the black liquor mixed liquor hybrid infusion that to over dry reed and wheat straw combined amount are 4%; Send into rotary spherical digester then, add the over dry material quantity is added the soda bath to over dry material quantity 9% in rotary spherical digester, sulphidity is 8%; Liquor ratio 1: 3, back rotary spherical digester idle running 20 minutes is filled in reed and wheat straw mixing; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 115 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 60 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 26 is equivalent to card uncle valency 45, and the pH value is 12.5 during boiling end, and the residual alkali concn in the black liquor is 13.5g/l.
Embodiment 17
Send into rotary spherical digester through reed, wheat straw and straw behind the dry raw material preparation and carry out the Arbiso process boiling, add total acid 5%, the cooking liquor of combined acid 1.0-3.0%, reed, wheat straw and straw mix fills back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 115 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 60 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 26 is equivalent to card uncle valency 45.
What following examples related to is as the high-quality paper pulp of feedstock production with the high-hardness pulp in the foregoing description.
Embodiment 18
The hardness of the intact gained afterwards of boiling is washed with pressure washer for the high-hardness pulp that permanganate number 16-18 is equivalent to card uncle valency 22-30, after the washing high-hardness pulp is diluted, being diluted to concentration is 5-12%; Bleach, at first carry out oxygen and float, its oxygen addition is the 2-5% of oven dry stock amount; The addition of NaOH adds magnesium sulfate salt and makes protective agent for being the 2-6% of oven dry stock amount, and the temperature that oxygen floats is 90-110 ℃; After one section oxygen floats end, repeat oxygen in an identical manner and float once, oxygen floats after the end; Bleach with 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, 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 6000m, is a kind of high-quality paper pulp.
Embodiment 19
The hardness of the intact gained afterwards of boiling is carried out shove with the 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, the impurity in the black liquor is also discharged in company with black liquor together simultaneously; Slurry with gained washs with suction washer afterwards, and after the washing high-hardness pulp being diluted to concentration is 8-12%, bleaches then; At first carry out oxygen and float, its oxygen addition is the 2-5% of oven dry stock amount, and the addition of NaOH is for being 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 with 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 75%ISO, and fracture length is 6200m, is a kind of high-quality paper pulp.
Embodiment 20
The hardness of the intact gained afterwards of boiling is carried out shove with the 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, the impurity in the black liquor is also discharged in company with black liquor together simultaneously; Slurry with gained washs with pressure washer afterwards, after the washing high-hardness pulp is diluted, and being diluted to concentration is 5-12%; 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, adds magnesium sulfate salt and makes protective agent, and the temperature that oxygen floats is 90-110 ℃; After one section oxygen floats end, bleach chlorination-alkali treatment-hypochlorite bleaching again with 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, is a kind of high-quality paper pulp.
Embodiment 21
The hardness of the intact gained afterwards of boiling is carried out shove with Double screw pulp extruder earlier for the high-hardness pulp that permanganate number 20-22 is equivalent to card uncle valency 34-38, through shove black liquor is extruded, the impurity in the black liquor is also discharged in company with black liquor together simultaneously; Slurry with gained washs with suction washer afterwards, after the washing high-hardness pulp is diluted, and 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 adds magnesium sulfate salt and makes protective agent for being the 2-6% of oven dry stock amount, and the temperature that oxygen floats is 90-110 ℃; After one section oxygen floats end, bleach chlorination-alkali treatment-hypochlorite bleaching again with 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 78%ISO, and fracture length is 6400m, is a kind of high-quality paper pulp.
Embodiment 22
The hardness of the intact gained afterwards of boiling is carried out shove with the single-screw press master earlier for the high-hardness pulp that permanganate number 22-25 is equivalent to card uncle valency 38-42, through shove black liquor is extruded, the impurity in the black liquor is also discharged in company with black liquor together simultaneously; Slurry with gained washs with pressure washer afterwards, after the washing high-hardness pulp is diluted, and 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 adds magnesium sulfate salt and makes protective agent for being the 2-6% of oven dry stock amount, and the temperature that oxygen floats is 90-110 ℃; After one section oxygen floats end, repeat above-mentioned step and carry out one section oxygen again and float, bleach with more traditional mode at last; 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 80%ISO, and fracture length is 6500m, is a kind of high-quality paper pulp.
Embodiment 23
The hardness of the intact gained afterwards of boiling is carried out shove with the single-screw press master earlier for the high-hardness pulp that permanganate number 25-28 is equivalent to card uncle valency 42-50, through shove black liquor is extruded, the impurity in the black liquor is also discharged in company with black liquor together simultaneously; Get into the mill fluffer after the shove and discongest, the slurry with gained washs with suction washer again, after the washing high-hardness pulp is diluted; Being diluted to concentration is 5-12%, bleaches, and at first carries out oxygen and floats; Its oxygen addition is the 2-5% of oven dry stock amount, and the addition of NaOH adds magnesium sulfate salt and makes protective agent for being the 2-6% of oven dry stock amount; The temperature that oxygen floats is 90-110 ℃, after one section oxygen floats end, bleaches with 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 6200m, is a kind of high-quality paper pulp.
Embodiment 24
With boiling intact after the hardness of gained wash with pressure washer earlier for the high-hardness pulp that permanganate number 19-21 is equivalent to card uncle valency 31-35, then the slurry of gained is added to the mill fluffer and discongests, the slurry with gained washs with suction washer afterwards; After the washing high-hardness pulp is diluted, being diluted to concentration is 10-12%, bleaches; At first carry out oxygen and float, its oxygen addition is the 2-5% of oven dry stock amount, and the addition of NaOH is for being 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 with 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 75%ISO, and fracture length is 5800m, is a kind of high-quality paper pulp.
Embodiment 25
The hardness of the intact gained afterwards of boiling is carried out shove with the single-screw press master earlier for the high-hardness pulp that permanganate number 20-23 is equivalent to card uncle valency 34-40, through shove black liquor is extruded, the impurity in the black liquor is also discharged in company with black liquor together simultaneously; Slurry with gained washs with suction washer afterwards, after the washing high-hardness pulp is diluted, and 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 adds magnesium sulfate salt and makes protective agent for being the 2-6% of oven dry stock amount, and the temperature that oxygen floats is 90-110 ℃; After one section oxygen floats end, bleach chlorination-alkali treatment-hypochlorite bleaching again with 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 80%ISO, and fracture length is 6700m, is a kind of high-quality paper pulp.
Embodiment 26
The hardness of the intact gained afterwards of boiling is carried out shove with the single-screw press master earlier for the high-hardness pulp that permanganate number 16-19 is equivalent to card uncle valency 24-31, through shove black liquor is extruded, the impurity in the black liquor is also discharged in company with black liquor together simultaneously; Slurry with gained washs with suction washer afterwards, gets into the mill fluffer and discongests after the washing, discongests that the concentration of high-hardness pulp is 8-12% after finishing; 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, adds magnesium sulfate salt and makes protective agent, and the temperature that oxygen floats is 90-110 ℃; After one section oxygen floats end, bleach chlorination-alkali treatment-hypochlorite bleaching again with 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 82%ISO, and fracture length is 6700m, is a kind of high-quality paper pulp.

Claims (7)

1. one kind is the alkaline process cooking method of feedstock production high-hardness pulp with the grass kind plant, it is characterized in that, described alkaline cooking is a kind of in anthraquinone-soda processes and the sulfate process, and preparation hardness is the high-hardness pulp of permanganate number 16-28;
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, insulation was 20-40 minute when heat temperature raising to temperature was 100-120 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was 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, insulation was 20-40 minute when heat temperature raising to temperature was 110-140 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was incubated 60-90 minute.
2. method according to claim 1 is characterized in that, described high-hardness pulp hardness is 18-27.
3. method according to claim 2 is characterized in that, described high-hardness pulp hardness is 20-25.
4. method according to claim 1 is characterized in that: described grass kind plant raw material is a kind of in wheat straw, straw, bagasse, cotton stalk, the reed or more than one mixing.
5. according to each described method among the claim 1-4, it is characterized in that: described high-hardness pulp is used for preparing bleach chemical pulp.
6. method according to claim 5; After it is characterized in that the grass kind plant raw material is got the raw materials ready in the described step (1); Deliver in the boiling vessel, after the grass kind plant raw material is got the raw materials ready, deliver to boiling vessel and also comprise the process of flooding before through the dipping spiral organ.
7. method according to claim 5 is characterized in that when heat temperature raising, described grass kind plant raw material being placed in the boiling vessel, and described boiling vessel is rotary spherical digester, vertical digester or continuous steamer.
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