CN102677509B - Material preparation process for preparing dissolving pulp by modifying bleached needle leave wood and broadleaf wood composite pulp - Google Patents
Material preparation process for preparing dissolving pulp by modifying bleached needle leave wood and broadleaf wood composite pulp Download PDFInfo
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- CN102677509B CN102677509B CN201210170730.7A CN201210170730A CN102677509B CN 102677509 B CN102677509 B CN 102677509B CN 201210170730 A CN201210170730 A CN 201210170730A CN 102677509 B CN102677509 B CN 102677509B
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Abstract
The invention discloses a material preparation process for preparing dissolving pulp by modifying bleached needle leave wood and broadleaf wood composite pulp. The process comprises the steps of preparing raw materials, dispersing, splicing, soaking and the like, specific process steps and process control parameters are adopted for composite pulp material of the bleached needle leave wood and the bleached broadleaf wood, so that the quality of a final product is improved, the energy is saved, the emission is reduced, the content, the yield and the whiteness of alpha cellulose in the finished product are improved, the ash content of the alpha cellulose is reduced, and a cost control of chemical liquid medicine is facilitated, a subsequent cooking heating curve is stable, degree of polymerization is uniformly decreased, the obtained semi-finished product is suitable for all kinds of cooking manners, and the application range is wide.
Description
Technical field
The present invention relates to a kind of technique of getting the raw materials ready for the preparation of dissolving pulp, more particularly, the present invention relates to a kind of technique of getting the raw materials ready that needlebush, the modification of leaf wood using compound pulp are prepared dissolving pulp that is applicable to bleach, belong to viscose fiber raw material-pulp preparing technical field.
Background technology
Along with the development of China's viscose industry, the raw materials for production of Cotton Pulp as viscose are prepared mainly with cotton linter by domestic enterprise.It is high that cotton linter has content of cellulose, fiber is long, intensity good, can be used for producing the advantage of multiple product, but the resource of raw material cotton linter be subject to cultivated area and growth cycle restriction and day by day shortage, because grain and cotton is striven the outstanding of ground contradiction, the impact of long period and the ecological balance thereof, has seriously restricted the development of China's viscose industry.Existing enterprise produces wood, bamboo dissolved pulp for viscose glue for this reason, but the price of import dissolving pulp is high, fluctuation large, has affected the normal operation of enterprise.
Preparing dissolving pulp can adopt bleaching bamboo and wood paper pulp or not float true qualities bamboo and wood paper pulp, its preparation process comprise select materials, get the raw materials ready, boiling, bleaching, the operation of washing and manufacture paper with pulp etc., the source part wherein select materials, procedure for preparation being whole technique, the design of its technological process, the selection of technological parameter, can affect the carrying out of subsequent technique and the quality of final product to a great extent.
It is 200710050472.8 that State Intellectual Property Office discloses an application number in 2008.3.26, name is called " paper-making-stage bamboo wood pulp plate denaturalization producing technique ", this invention provides a kind of modified production process of papermaking level bamboo wood-pulp board, the deficiency such as solve that existing sex change wood pulps production technology exists that wood-pulp board dipping is uneven, hemicellulose stripping is slow, falls poly-difficulty, half steaming is even, boiling method is single, method for bleaching is single and condition is violent.Step comprises wood-pulp board paging, alkali steeping, squeezes, discongests dispersion, boiling, washing, removal of impurities, bleaching, secondary washing, copy the dregs of rice; Wherein, described wood-pulp board paging, alkali steeping, squeezing discongest be by papermaking level bamboo wood-pulp board through paging device one by one separately after, send into concentration and be in 6%～18% alkali steeping bucket, flood into concentration and be after 2.5%～5% slurry congee, be pumped into squeezer with slurry congee and push and discongest loosen collagen fibre.Adopt the present invention to make the quality of dissolving grade viscose wood pulps more excellent, more stable, raw material choose is wider.
It is 201110049038.4 that State Intellectual Property Office discloses an application number in 2011.09.14, name is called " compound pulp of a kind of paper pulp and cotton linter and preparation method thereof ", this invention provides a kind of method of paper pulp and the compound Making viscose fiber of cotton linter pulp, employing the method can be by bamboo, wood, fiber crops, the special performance of the fibers such as bagasse combines with cotton excellent properties, can be other two or more paper pulp or bamboo arbitrarily, wood, cotton, fiber crops are waited the boiling of raw material independence, after series of process is processed, at the compound dissolving pulp that is prepared into of bleaching section.The kind of the present invention's paper pulp used is not subject to the restriction of production method and raw material, it can be natural color pulp, also can be bleached pulp, by alkali steeping processing, reduce pulp cooking difficulty, the dissolving pulp content of alphacellulose making is high, maceration extract reusable edible, adopt in the method pulping process and pollute less, can realize the recycle of alkali lye.
The technique of selecting materials and get the raw materials ready in above-mentioned two pieces of documents mainly contains following problem:
1, wayward in production, semi-manufactured goods quality is inhomogeneous, and end product quality is unstable; Chemical industry soup, energy resource consumption are large, and cost is high;
2, in alkali steeping, fiber pervasion is inhomogeneous, and non-fiber impurity stripping is few, falls poly-unstable, inhomogeneous.
It is 201110217636.8 that State Intellectual Property Office discloses an application number in 2011.12.14, name is called " production process for modified papermaking grade wood pulp ", this disclosure of the invention a kind of production process for modified papermaking grade wood pulp, it comprises following rapid: get the raw materials ready (1), papermaking grade wood pulp plate is carried to feeding hydrabrusher, through the dispersion of discongesting of alkali spray and agitator, send into squeezer and carry out, after extrusion dehydration, sending into rotary spherical digester; (2) boiling, the slurry having flooded enters rotary spherical digester and carries out boiling, adds caustic soda; (3) chlorination, carries out chlorination by boiling disposed slurry, adds hydrochloric acid, liquid chlorine, caustic soda; (4) bleaching, sends the slurry after chlorination into Bellmer and bleaches; (5) acid treatment, adds hydrochloric acid to carry out acid treatment, enters and floats pond through spray, manufactures paper with pulp, is packaged as wood pulps through paper machine.The present invention, by utilizing hydrabrusher fully to discongest dispersion to slurry, makes xylon and alkali lye dipping more even, increases substantially cooking homogeneities.By cooking process, can reduce non-cellulosic impurity content, reduce the cotton fiber degree of polymerization.By chloride process, can remove part foreign pigment, the fine content of corresponding raising first.By bleaching process, can improve cellulose whiteness, and maintenance fall poly-, remove impurity.By acid treatment, can remove ash, irony, improve reactivity worth.The modified papermaking grade wood pulp that adopts the present invention to produce can reach the index request of dissolving pulp, meets the production requirement of viscose.
The semi-finished product that the explained hereafter of selecting materials, get the raw materials ready in above-mentioned document goes out can only be applicable to minority boiling mode, be not suitable for wood composite pulp modifying and produce the technique of dissolving pulp, there is significant limitation, and labour intensity is large, cost is high, and single pulp property dullness, can not possess simultaneously antibacterial, antibacterial, be easy to the functions such as nursing, health environment-friendly.
Summary of the invention
The present invention is intended to solve in above-mentioned prior art, bleaching wood pulp is modified as the technique of getting the raw materials ready of dissolving pulp, semi-finished product and end product dissolving pulp are of low quality, cost is high, be only applicable to the problem of minority boiling mode, a kind of technique of getting the raw materials ready that needlebush, the modification of leaf wood using compound pulp are prepared dissolving pulp of bleaching is provided.The present invention can improve get the raw materials ready after the quality of semi-finished product and last dissolving pulp finished product, reduce costs, its semi-finished product are applicable to all boiling modes.
In order to realize foregoing invention object, its concrete technical scheme is:
Bleach needlebush and the modification of leaf wood using compound pulp and prepare the technique of getting the raw materials ready of dissolving pulp, it is characterized in that: comprise following processing step:
A, raw material are prepared
Be 100～250kg:1m according to bleaching needlebush paper pulp and bleaching leaf wood paper pulp gross weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching needlebush paper pulp and bleaching leaf wood paper pulp;
Be content of alphacellulose >=88% at the bleaching needlebush paper pulp described in steps A and bleaching leaf wood paper pulp, the degree of polymerization 700～1300DP, content of ashes≤0.50%, whiteness >=68%.
Above-mentioned bleaching needlebush paper pulp and bleaching leaf wood paper pulp are content of alphacellulose 89～92%, the degree of polymerization 800～1000DP, content of ashes 0.15～0.25%, whiteness 75～85%.
Be bleaching needlebush paper pulp at the bleaching needlebush paper pulp described in steps A with the compound part by weight of bleaching leaf wood paper pulp: bleaching leaf wood paper pulp=4:6～6:4.
B, dispersion and pulping
To bleach needlebush paper pulp and become pulp board with bleaching leaf wood paper pulp dispersion treatment, then will bleach needlebush pulp board and bleach leaf wood pulp board and mix with sodium hydroxide solution, carry out pulping processing, the mixture that obtains bleaching needlebush paper pulp, bleaching leaf wood paper pulp and sodium hydroxide solution starches congee, carry out next step impregnation process, the slurry concentration of the described slurry congee that processing obtains through pulping is 3～5% again;
Slurry concentration is this area technical term, refers to bleach needlebush paper pulp and bleach fiber over dry gross weight and bleaching needlebush paper pulp in leaf wood paper pulp, bleach the percentage of mixture (the starching congee) weight of leaf wood paper pulp and sodium hydroxide solution.
Will bleach needlebush pulp board and bleaching leaf wood pulp board and mix with sodium hydroxide solution described in step B, carrying out pulping processing refers to bleaching needlebush pulp board and bleaching leaf wood pulp board is delivered to hydrabrusher with the transporting velocity of 85～200kg/min, add sodium hydroxide solution to carry out pulping processing, and pulping discharging speed after treatment is 2.8～6m simultaneously
3/ min.
The electric machine frequency of above-mentioned hydrabrusher is 30～60Hz.
C, dipping
To carry out impregnation process through the slurry congee that disperses pulping to obtain;
Be 1～20 minute in the time of the dipping described in step C, dipping temperature is 10～40 ℃, and after dipping, slurry concentration is 2～5%.
D, the de-liquid of squeezing
To squeeze de-liquid through the slurry congee of dipping, the de-liquid of squeezing is 20～35% to starching congee mass dryness fraction;
Mass dryness fraction is this area technical term, refers to the percentage of the weight of all liq in the liquid weight of sloughing and the mixture (starching congee) of bleaching needlebush paper pulp, bleaching leaf wood paper pulp and sodium hydroxide solution.
Pressure control at the de-liquid of the squeezing described in step D is 0.4～0.5MPa.
Be 3.0～5.1% at the slurry congee alkalinity through the de-liquid of squeezing described in step D, methylcellulose content is 20～25%.
E, pulverizing
To be ground into cotton-shaped or single fiber through the slurry congee of the de-liquid of squeezing;
Be to pulverize in sending into pulverizer through the slurry congee of the de-liquid of squeezing with the speed of 85～200kg/min in the pulverizing described in step e.
F, the slurry congee that is ground into cotton-shaped or single fiber is sent in boiling vessel, control liquor ratio is 1:3～4, and in sodium hydrate solid weight and slurry congee, the percentage of fiber over dry gross weight is 17～22%, carries out next step cooking process.
Liquor ratio (or being called bath raio) is this area technical term, refers to the ratio of fiber over dry gross weight and sodium hydroxide solution volume in bleaching needlebush paper pulp and bleaching leaf wood paper pulp.
This technique device therefor:
1, the boiling vessel in steps A and step F is rotary spherical digester, steamer or continuous steamer, and continuous steamer comprises horizontal continuous cooking device or tower continuous steamer;
2, in step B, being delivered to hydrabrusher is to adopt belt conveyor, and pulping complete after slurry congee by delivery pump discharging, be delivered to impregnating equipment;
3, the impregnating equipment in step C is treating tank, gives dipping machine or double helix kneading machine;
4, the de-liquid equipment of the squeezing in step D is squeezer or acroll press washer;
5, the disintegrating apparatus in step e is pulverizer, fluffer, squeezing pulverizer, stirs pulverizer or spiral pulverizer; To be delivered to disintegrating apparatus by belt conveyor through the slurry congee of the de-liquid of squeezing;
The said equipment is this area conventional equipment.
The useful technique effect that the present invention brings:
1, the viscose that single paper pulp pulp is produced, performance dullness, performance is different, have their own characteristics each, as the deflection of skin affinity, fiber, antibacterial bacteriostatic function, fiber soft feeling, deodorization, gas permeability, coloring, bounce-back, humidity absorption and release, but using compound pulp of the present invention can possess above-mentioned multifrequency nature simultaneously;
2, bleaching needlebush, leaf wood using compound pulp fibre morphology evenly, finished product first fine containing high, viscosity evenly, reactivity worth is higher, has antibacterial bacteriostatic function, fiber soft feeling is good, deodorization is good;
3, the present invention sends into bleaching needlebush pulp board and bleaching leaf wood pulp board in hydrabrusher, to carry out cold alkali pulping, process with regard to having flooded when pulping, after pulping completes, send into again and in treating tank, carry out assistant soakage, can increase substantially the uniformity of alkali steeping and the quality of subsequent product, be conducive to the stripping of half fiber impurity, improve cooking quality, methylcellulose content is high, has also played the effect of stable liquid level;
4, the technical process of getting the raw materials ready of the present invention is easy to control, and the semi-manufactured goods quality before boiling is even, and the ash content of end product is easy to control, and can save well chemical industry soup, shortens washing flow, saves water, electric consumption, has reduced cost and the pollution to environment;
5, the process equipment less investment of getting the raw materials ready of the present invention, cost is low, and productivity ratio is high, and single machine production ability is large, and control stability is good;
6, the present invention, by the optimization of the technological parameter system of getting the raw materials ready, has reached following effect:
(1) due to inventory and digesting apparatus volume ratio are made to optimization, the semi-finished product that obtain that make to get the raw materials ready can pack digesting apparatus well into, density is moderate, be conducive to semi-finished product in boiling where, roll boiling, evenly soak into, produce easy to control, improve cooking quality, be conducive to evenly soaking into and to fiber homogeneous heating, having taken into account utilization rate and the economy of equipment simultaneously of liquid;
(2) using compound pulp modification of the prior art or sex change are prepared in the technique of dissolving pulp, its production of getting the raw materials ready is wayward, cause the quality of final product low, and the standard that the present invention selects materials by optimization, make whole dissolving pulp production process be easy to control, end product quality is stable, and content of alphacellulose is high, yield is high; The viscose finally making pulp lighter color, alleviates bleaching pressure, and little to the fine damage of first, environmental protection pressure is little;
(3) adopt raw material pulping of the present invention, dipping and squeezing to take off liquid technological parameter system, paper pulp fiber soaks into evenly, and non-cellulosic impurity stripping is many, can remove so most of non-cellulosic impurity, falls poly-stablizing, and is conducive to the cost control of chemical industry soup;
(4) adopt raw material pulping of the present invention, dipping and squeezing to take off liquid technological parameter system, be conducive to fiber and fully soak into, make follow-up boiling heating curve steady, fall poly-evenly, the semi-finished product that make applicable to various boiling modes, applied range;
(5) adopt technique and the parameter of impregnation steps of the present invention, evenly, every fiber is all soaked into by alkali lye dipping, and containing alkali >=3.0%, first fibre >=20.0%, is conducive to boiling and falls evenly poly-ly with fiber after NaOH hybrid infusion, and non-cellulosic impurity stripping is many;
(6) adopt pulping of the present invention, dipping and squeezing to take off technique and the parameter of liquid step, can make fiber occur expanded, longitudinal contraction, diameter increases, and can improve the chemical activity of fiber, and its result can make fiber moisture absorption, and chemical reaction ability and dye uptake strengthen; Can also make a large amount of strippings of non-cellulosic impurity, in and the organic acid that produces in digestion process, saponification, contained grease, the wax etc. of emulsification fiber, react with lignin etc., in addition, after getting the raw materials ready, mass dryness fraction is moderate, can reduce liquor ratio, and liquid is mixed;
(7) adopt the transporting velocity parameter system of conveying equipment of the present invention, can make efficiency and quality in integrated artistic flow process reach best dynamic equilibrium, can farthest avoid the waste of material, liquid;
7, the present invention is directed to bleaching needlebush paper pulp and bleaching leaf wood paper pulp compound material, take above-mentioned specific processing step and process control parameter thereof, thereby make as a whole technical scheme, can realize the object that improves end product quality, energy-saving and emission-reduction, improve the fine content of first, yield and the whiteness of finished product, reduce ash content, be conducive to the cost control of chemical industry soup, make follow-up boiling heating curve steady, fall evenly poly-, the semi-finished product that make applicable to various boiling modes, applied range.
The specific embodiment
embodiment 1
Bleach needlebush and the modification of leaf wood using compound pulp and prepare the technique of getting the raw materials ready of dissolving pulp, comprise following processing step:
A, raw material are prepared
Be 100kg:1m according to bleaching needlebush paper pulp and bleaching leaf wood paper pulp gross weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching needlebush paper pulp and bleaching leaf wood paper pulp;
B, dispersion and pulping
To bleach needlebush paper pulp and become pulp board with bleaching leaf wood paper pulp dispersion treatment, then will bleach needlebush pulp board and bleach leaf wood pulp board and mix with sodium hydroxide solution, carry out pulping processing, the mixture that obtains bleaching needlebush paper pulp, bleaching leaf wood paper pulp and sodium hydroxide solution starches congee, carry out next step impregnation process, the slurry concentration of the described slurry congee that processing obtains through pulping is 3% again;
C, dipping
To carry out impregnation process through the slurry congee that disperses pulping to obtain;
D, the de-liquid of squeezing
To squeeze de-liquid through the slurry congee of dipping, the de-liquid of squeezing is 20% to starching congee mass dryness fraction;
E, pulverizing
To be ground into cotton-shaped or single fiber through the slurry congee of the de-liquid of squeezing;
F, the slurry congee that is ground into cotton-shaped or single fiber is sent in boiling vessel, control liquor ratio is 1:3, and in sodium hydrate solid weight and slurry congee, the percentage of fiber over dry gross weight is 17%, carries out next step cooking process.
embodiment 2
Bleach needlebush and the modification of leaf wood using compound pulp and prepare the technique of getting the raw materials ready of dissolving pulp, comprise following processing step:
A, raw material are prepared
Be 250kg:1m according to bleaching needlebush paper pulp and bleaching leaf wood paper pulp gross weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching needlebush paper pulp and bleaching leaf wood paper pulp;
B, dispersion and pulping
To bleach needlebush paper pulp and become pulp board with bleaching leaf wood paper pulp dispersion treatment, then will bleach needlebush pulp board and bleach leaf wood pulp board and mix with sodium hydroxide solution, carry out pulping processing, the mixture that obtains bleaching needlebush paper pulp, bleaching leaf wood paper pulp and sodium hydroxide solution starches congee, carry out next step impregnation process, the slurry concentration of the described slurry congee that processing obtains through pulping is 5% again;
C, dipping
To carry out impregnation process through the slurry congee that disperses pulping to obtain;
D, the de-liquid of squeezing
To squeeze de-liquid through the slurry congee of dipping, the de-liquid of squeezing is 35% to starching congee mass dryness fraction;
E, pulverizing
To be ground into cotton-shaped or single fiber through the slurry congee of the de-liquid of squeezing;
F, the slurry congee that is ground into cotton-shaped or single fiber is sent in boiling vessel, control liquor ratio is 1:4, and in sodium hydrate solid weight and slurry congee, the percentage of fiber over dry gross weight is 22%, carries out next step cooking process.
embodiment 3
Bleach needlebush and the modification of leaf wood using compound pulp and prepare the technique of getting the raw materials ready of dissolving pulp, comprise following processing step:
A, raw material are prepared
Be 175kg:1m according to bleaching needlebush paper pulp and bleaching leaf wood paper pulp gross weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching needlebush paper pulp and bleaching leaf wood paper pulp;
B, dispersion and pulping
To bleach needlebush paper pulp and become pulp board with bleaching leaf wood paper pulp dispersion treatment, then will bleach needlebush pulp board and bleach leaf wood pulp board and mix with sodium hydroxide solution, carry out pulping processing, the mixture that obtains bleaching needlebush paper pulp, bleaching leaf wood paper pulp and sodium hydroxide solution starches congee, carry out next step impregnation process, the slurry concentration of the described slurry congee that processing obtains through pulping is 4% again;
C, dipping
To carry out impregnation process through the slurry congee that disperses pulping to obtain;
D, the de-liquid of squeezing
To squeeze de-liquid through the slurry congee of dipping, the de-liquid of squeezing is 27.5% to starching congee mass dryness fraction;
E, pulverizing
To be ground into cotton-shaped or single fiber through the slurry congee of the de-liquid of squeezing;
F, the slurry congee that is ground into cotton-shaped or single fiber is sent in boiling vessel, control liquor ratio is 1:3.5, and in sodium hydrate solid weight and slurry congee, the percentage of fiber over dry gross weight is 19.5%, carries out next step cooking process.
embodiment 4
Bleach needlebush and the modification of leaf wood using compound pulp and prepare the technique of getting the raw materials ready of dissolving pulp, comprise following processing step:
A, raw material are prepared
Be 120kg:1m according to bleaching needlebush paper pulp and bleaching leaf wood paper pulp gross weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching needlebush paper pulp and bleaching leaf wood paper pulp;
B, dispersion and pulping
To bleach needlebush paper pulp and become pulp board with bleaching leaf wood paper pulp dispersion treatment, then will bleach needlebush pulp board and bleach leaf wood pulp board and mix with sodium hydroxide solution, carry out pulping processing, the mixture that obtains bleaching needlebush paper pulp, bleaching leaf wood paper pulp and sodium hydroxide solution starches congee, carry out next step impregnation process, the slurry concentration of the described slurry congee that processing obtains through pulping is 4.2% again;
C, dipping
To carry out impregnation process through the slurry congee that disperses pulping to obtain;
D, the de-liquid of squeezing
To squeeze de-liquid through the slurry congee of dipping, the de-liquid of squeezing is 23% to starching congee mass dryness fraction;
E, pulverizing
To be ground into cotton-shaped or single fiber through the slurry congee of the de-liquid of squeezing;
F, the slurry congee that is ground into cotton-shaped or single fiber is sent in boiling vessel, control liquor ratio is 1:3.8, and in sodium hydrate solid weight and slurry congee, the percentage of fiber over dry gross weight is 21%, carries out next step cooking process.
embodiment 5
On the basis of embodiment 1～4, preferred:
Be content of alphacellulose 88% at the bleaching needlebush paper pulp described in steps A and bleaching leaf wood paper pulp, degree of polymerization 700DP, content of ashes 0.10%, whiteness 68%.
Above-mentioned bleaching needlebush paper pulp and bleaching leaf wood paper pulp are content of alphacellulose 89%, degree of polymerization 800DP, content of ashes 0.15%, whiteness 75%.
Be bleaching needlebush paper pulp at the bleaching needlebush paper pulp described in steps A with the compound part by weight of bleaching leaf wood paper pulp: bleaching leaf wood paper pulp=6:4.
Will bleach needlebush pulp board and bleaching leaf wood pulp board and mix with sodium hydroxide solution described in step B, carrying out pulping processing refers to bleaching needlebush pulp board and bleaching leaf wood pulp board is delivered to hydrabrusher with the transporting velocity of 85kg/min, add sodium hydroxide solution to carry out pulping processing, and pulping discharging speed after treatment is 2.8m simultaneously
3/ min.
The electric machine frequency of described hydrabrusher is 30Hz.
Be 1 minute in the time of the dipping described in step C, dipping temperature is 10 ℃, and after dipping, slurry concentration is 2%.
Pressure control at the de-liquid of the squeezing described in step D is 0.4MPa.
Be 3.0% at the slurry congee alkalinity through the de-liquid of squeezing described in step D, methylcellulose content is 20%.
Be to pulverize in sending into pulverizer through the slurry congee of the de-liquid of squeezing with the speed of 85kg/min in the pulverizing described in step e.
embodiment 6
On the basis of embodiment 1～4, preferred:
Be content of alphacellulose >=95% at the bleaching needlebush paper pulp described in steps A and bleaching leaf wood paper pulp, degree of polymerization 1300DP, content of ashes 0.50%, whiteness 90%.
Above-mentioned bleaching needlebush paper pulp and bleaching leaf wood paper pulp are content of alphacellulose 92%, degree of polymerization 1000DP, content of ashes 0.25%, whiteness 85%.
Be bleaching needlebush paper pulp at the bleaching needlebush paper pulp described in steps A with the compound part by weight of bleaching leaf wood paper pulp: bleaching leaf wood paper pulp=4:6.
Will bleach needlebush pulp board and bleaching leaf wood pulp board and mix with sodium hydroxide solution described in step B, carrying out pulping processing refers to bleaching needlebush pulp board and bleaching leaf wood pulp board is delivered to hydrabrusher with the transporting velocity of 200kg/min, add sodium hydroxide solution to carry out pulping processing, and pulping discharging speed after treatment is 6m simultaneously
3/ min.
The electric machine frequency of described hydrabrusher is 60Hz.
Be 20 minutes in the time of the dipping described in step C, dipping temperature is 40 ℃, and after dipping, slurry concentration is 5%.
Pressure control at the de-liquid of the squeezing described in step D is 0.5MPa.
Be 5.1% at the slurry congee alkalinity through the de-liquid of squeezing described in step D, methylcellulose content is 25%.
Be to pulverize in sending into pulverizer through the slurry congee of the de-liquid of squeezing with the speed of 200kg/min in the pulverizing described in step e.
embodiment 7
On the basis of embodiment 1～4, preferred:
Be content of alphacellulose 91.5% at the bleaching needlebush paper pulp described in steps A and bleaching leaf wood paper pulp, degree of polymerization 1000DP, content of ashes 0.30%, whiteness 79%.
Above-mentioned bleaching needlebush paper pulp and bleaching leaf wood paper pulp are content of alphacellulose 90.5%, degree of polymerization 900DP, content of ashes 0.2%, whiteness 80%.
Be bleaching needlebush paper pulp at the bleaching needlebush paper pulp described in steps A with the compound part by weight of bleaching leaf wood paper pulp: bleaching leaf wood paper pulp=12:13.
Will bleach needlebush pulp board and bleaching leaf wood pulp board and mix with sodium hydroxide solution described in step B, carrying out pulping processing refers to bleaching needlebush pulp board and bleaching leaf wood pulp board is delivered to hydrabrusher with the transporting velocity of 142.5kg/min, add sodium hydroxide solution to carry out pulping processing, and pulping discharging speed after treatment is 4.4m simultaneously
3/ min.
The electric machine frequency of described hydrabrusher is 45Hz.
Be 10.5 minutes in the time of the dipping described in step C, dipping temperature is 25 ℃, and after dipping, slurry concentration is 3.5%.
Pressure control at the de-liquid of the squeezing described in step D is 0.45MPa.
Be 4.05% at the slurry congee alkalinity through the de-liquid of squeezing described in step D, methylcellulose content is 22.5%.
Be to pulverize in sending into pulverizer through the slurry congee of the de-liquid of squeezing with the speed of 142.5kg/min in the pulverizing described in step e.
embodiment 8
On the basis of embodiment 1～4, preferred:
Be content of alphacellulose 90% at the bleaching needlebush paper pulp described in steps A and bleaching leaf wood paper pulp, degree of polymerization 1100DP, content of ashes 0.4%, whiteness 75%.
Above-mentioned bleaching needlebush paper pulp and bleaching leaf wood paper pulp are content of alphacellulose 91%, degree of polymerization 950DP, content of ashes 0.17%, whiteness 78%.
Be bleaching needlebush paper pulp at the bleaching needlebush paper pulp described in steps A with the compound part by weight of bleaching leaf wood paper pulp: bleaching leaf wood paper pulp=6:7.
Will bleach needlebush pulp board and bleaching leaf wood pulp board and mix with sodium hydroxide solution described in step B, carrying out pulping processing refers to bleaching needlebush pulp board and bleaching leaf wood pulp board is delivered to hydrabrusher with the transporting velocity of 186kg/min, add sodium hydroxide solution to carry out pulping processing, and pulping discharging speed after treatment is 3.9m simultaneously
3/ min.
The electric machine frequency of described hydrabrusher is 49Hz.
Be 7 minutes in the time of the dipping described in step C, dipping temperature is 30 ℃, and after dipping, slurry concentration is 4%.
Pressure control at the de-liquid of the squeezing described in step D is 0.41MPa.
Be 5% at the slurry congee alkalinity through the de-liquid of squeezing described in step D, methylcellulose content is 23%.
Be to pulverize in sending into pulverizer through the slurry congee of the de-liquid of squeezing with the speed of 186kg/min in the pulverizing described in step e.
embodiment 9
Bleach needlebush and the modification of leaf wood using compound pulp and prepare the technique of getting the raw materials ready of dissolving pulp, comprise following processing step:
A, raw material are prepared
Be 100～250kg:1m according to bleaching needlebush paper pulp and bleaching leaf wood paper pulp gross weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching needlebush paper pulp and bleaching leaf wood paper pulp; Get the raw materials ready according to aforementioned proportion, make the density in boiling vessel moderate;
Be content of alphacellulose >=88% at the bleaching needlebush paper pulp described in steps A and bleaching leaf wood paper pulp, the degree of polymerization 700～1300DP, content of ashes≤0.50%, whiteness >=68%.
Be more preferably, reach the balance of material quality and economy, above-mentioned bleaching needlebush paper pulp and bleaching leaf wood paper pulp are content of alphacellulose 89～92%, the degree of polymerization 800～1000DP, content of ashes 0.15～0.25%, whiteness 75～85%.
Be bleaching needlebush paper pulp at the bleaching needlebush paper pulp described in steps A with the compound part by weight of bleaching leaf wood paper pulp: bleaching leaf wood paper pulp=4:6～6:4.
B, dispersion and pulping
To bleach needlebush paper pulp and become pulp board with bleaching leaf wood paper pulp dispersion treatment, then will bleach needlebush pulp board and bleach leaf wood pulp board and mix with sodium hydroxide solution, carry out pulping processing, the mixture that obtains bleaching needlebush paper pulp, bleaching leaf wood paper pulp and sodium hydroxide solution starches congee, carry out next step impregnation process, the slurry concentration of the described slurry congee that processing obtains through pulping is 3～5% again;
The concentration of the above-mentioned sodium hydroxide solution adding is 1:3～4 by the liquor ratio in final step F, sodium hydrate solid weight is 17～22% controls with the percentage of starching fiber over dry gross weight in congee, in step C, D and E, sodium hydroxide solution may lose, in step F, can add sodium hydroxide solution, making liquor ratio is 1:3～4, and sodium hydrate solid weight is 17～22% with the percentage of starching fiber over dry gross weight in congee.
The raw material paper pulp of buying back is one to wrap, and disperses to adopt bale opener that packing is opened, and re-uses paging cutter raw material is divided into pulp board one by one, finally uses the belt conveyor of feeding dregs of rice machine to carry pulp board to hydrabrusher;
Slurry concentration is this area technical term, refers to bleach needlebush paper pulp and bleach fiber over dry gross weight and bleaching needlebush paper pulp in leaf wood paper pulp, bleach the percentage of mixture (the starching congee) weight of leaf wood paper pulp and sodium hydroxide solution.
Will bleach needlebush pulp board and bleaching leaf wood pulp board and mix with sodium hydroxide solution described in step B, carrying out pulping processing refers to bleaching needlebush pulp board and bleaching leaf wood pulp board is delivered to hydrabrusher with the transporting velocity of 85～200kg/min, add sodium hydroxide solution to carry out pulping processing, and pulping discharging speed after treatment is 2.8～6m simultaneously
3/ min.
The electric machine frequency of above-mentioned hydrabrusher is 30～60Hz.
C, dipping
To carry out impregnation process through the slurry congee that disperses pulping to obtain;
Be 1～20 minute in the time of the dipping described in step C, dipping temperature is 10～40 ℃, and after dipping, slurry concentration is 2～5%.
D, the de-liquid of squeezing
To squeeze de-liquid through the slurry congee of dipping, the de-liquid of squeezing is 20～35% to starching congee mass dryness fraction;
Mass dryness fraction is this area technical term, refers to the percentage of the weight of all liq in the liquid weight of sloughing and the mixture (starching congee) of bleaching needlebush paper pulp, bleaching leaf wood paper pulp and sodium hydroxide solution.
Pressure control at the de-liquid of the squeezing described in step D is 0.4～0.5MPa.
Be 3.0～5.1% at the slurry congee alkalinity through the de-liquid of squeezing described in step D, methylcellulose content is 20～25%.
E, pulverizing
To be ground into cotton-shaped or single fiber through the slurry congee of the de-liquid of squeezing;
Be to pulverize in sending into pulverizer through the slurry congee of the de-liquid of squeezing with the speed of 85～200kg/min in the pulverizing described in step e.
F, the slurry congee that is ground into cotton-shaped or single fiber is sent in boiling vessel, control liquor ratio is 1:3～4, and in sodium hydrate solid weight and slurry congee, the percentage of fiber over dry gross weight is 17～22%, carries out next step cooking process.
Liquor ratio (or being called bath raio) is this area technical term, refers to the ratio of fiber over dry gross weight and sodium hydroxide solution volume in bleaching needlebush paper pulp and bleaching leaf wood paper pulp.
This technique device therefor:
1, the boiling vessel in steps A and step F is rotary spherical digester, steamer or continuous steamer, and continuous steamer comprises horizontal continuous cooking device or tower continuous steamer;
2, in step B, being delivered to hydrabrusher is to adopt belt conveyor, and pulping complete after slurry congee by delivery pump discharging, be delivered to impregnating equipment;
3, the impregnating equipment in step C is treating tank, gives dipping machine or double helix kneading machine;
4, the de-liquid equipment of the squeezing in step D is squeezer or acroll press washer;
5, the disintegrating apparatus in step e is pulverizer, fluffer, squeezing pulverizer, stirs pulverizer or spiral pulverizer; To be delivered to disintegrating apparatus by belt conveyor through the slurry congee of the de-liquid of squeezing;
The said equipment is this area conventional equipment.
embodiment 10
Digesting technoloy:
The semi-finished product that obtain getting the raw materials ready carry out boiling, the steam pipe of described continuous steamer is made as 3 sections, one section that is connected with pre-reaction feed bin is provided with the T shape pipe that adds alkali lye and the steam pipe that adds steam, and other two sections are equipped with the steam pipe that adds steam, and its digesting technoloy requires as follows:
Liquor ratio: 1:2.0～4.0;
Add cooking liquor by 17～30% of oven dry weight;
The vapor (steam) temperature of one section being connected with pre-reaction feed bin of described steam pipe is 105 ± 5 ℃;
The vapor (steam) temperature of middle one section is 140 ± 5 ℃;
The vapor (steam) temperature of one section being connected with cold spraying device is 150 ℃～175 ℃;
Compression ratio: 1:2～3.0.
Described digestant is NaOH and Na
2sO
3mixed solution, mixed proportion is NaOH:Na
2sO
3=90～98%:2～10%.
embodiment 11
Aftertreatment technology:
Carry out sodium hypochlorite bleaching 18～25 minutes by send into the Bellmer of adjusting after alkali through the pulp of boiling, after dechlorination, acid treatment, complete bleaching, technological parameter is as follows:
Adjust alkali number: 20～200g/m
3;
Clorox consumption: 0.1～0.6g/l;
Hypo consumption: 1.8～2 times of residual chlorine;
Acid treatment: hydrochloric acid consumption 1～4%, process 30～60 minutes;
Calgon consumption 0.5～2%;
Consumption of oxalic acid 0.5～2%;
30～60 ℃ of bleaching temperatures;
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in, and technological parameter comprises:
The desanding concentration of manufacturing paper with pulp: 0.6～1.5%;
Desanding pressure: 0.15～0.32MPa manufactures paper with pulp;
The water of sizing mixing: clear water, plain boiled water;
Online concentration: 0.6～1.5%;
One squeeze pressure: 0.1～0.3MPa;
Second press pressure: 0.2～0.5MPa;
Three road squeeze pressure: 0.3～0.7MPa;
Drying cylinder steam pressure: 0.15～0.35MPa;
Cut paper specification: 600*800;
Metering specification: 100～250Kg/ bag.
embodiment 12
Get the raw materials ready semi-finished product that technique makes of the present invention adopt dissolving pulp that conventional digesting technoloy and aftertreatment technology obtain and do not adopt the present invention to get the raw materials ready technique makes semi-finished product to adopt the index comparison of the dissolving pulp that conventional digesting technoloy and aftertreatment technology obtain:
Get the raw materials ready after technique through of the present invention, under the prerequisite of the degree of polymerization that guarantees finished product, the fine content of the first of finished product dissolving pulp, yield and whiteness all have lifting, play remarkable effect especially to reducing ash content.
Claims (3)
1. bleach needlebush and the modification of leaf wood using compound pulp and prepare the technique of getting the raw materials ready of dissolving pulp, it is characterized in that: comprise following processing step:
A, raw material are prepared
Be 100～250kg:1m according to bleaching needlebush paper pulp and bleaching leaf wood paper pulp gross weight with the ratio of boiling vessel volume
3, bleaching needlebush paper pulp is bleaching needlebush paper pulp with the compound part by weight of bleaching leaf wood paper pulp: bleaching leaf wood paper pulp=4:6～6:4 gets the raw materials ready, and chooses bleaching needlebush paper pulp and bleaching leaf wood paper pulp; Described bleaching needlebush paper pulp and bleaching leaf wood paper pulp are content of alphacellulose 89～92%, the degree of polymerization 800～1000DP, content of ashes 0.15～0.25%, whiteness 75～85%;
B, dispersion and pulping
To bleach needlebush paper pulp and become pulp board with bleaching leaf wood paper pulp dispersion treatment, then bleaching needlebush pulp board and bleaching leaf wood pulp board are delivered to the hydrabrusher of electric machine frequency as 30～60Hz take the transporting velocity of 85～200kg/min, add sodium hydroxide solution to carry out pulping processing, and pulping discharging speed after treatment is 2.8～6m simultaneously
3/ min, the mixture that obtains bleaching needlebush paper pulp, bleaching leaf wood paper pulp and sodium hydroxide solution starches congee, then carries out next step impregnation process, and the slurry concentration of the described slurry congee that processing obtains through pulping is 3～5%;
C, dipping
To carry out impregnation process through the slurry congee that disperses pulping to obtain; The time of described dipping is 1～20 minute, and dipping temperature is 10～40 ℃, and after dipping, slurry concentration is 2～5%;
D, the de-liquid of squeezing
To squeeze de-liquid through the slurry congee of dipping, the de-liquid of squeezing is 20～35% to starching congee mass dryness fraction; The pressure control of the described de-liquid of squeezing is 0.4～0.5MPa;
E, pulverizing
To be ground into cotton-shaped or single fiber through the slurry congee of the de-liquid of squeezing;
F, the slurry congee that is ground into cotton-shaped or single fiber is sent in boiling vessel, control liquor ratio is 1:3～4, and in sodium hydrate solid weight and slurry congee, the percentage of fiber over dry gross weight is 17～22%, carries out next step cooking process.
2. a kind of technique of getting the raw materials ready that dissolving pulp is prepared in needlebush and the modification of leaf wood using compound pulp of bleaching according to claim 1, is characterized in that: the described slurry congee alkalinity through the de-liquid of squeezing is 3.0～5.1%, and methylcellulose content is 20～25%.
3. a kind of technique of getting the raw materials ready that dissolving pulp is prepared in needlebush and the modification of leaf wood using compound pulp of bleaching according to claim 1, is characterized in that: be to pulverize in sending into pulverizer through the slurry congee of the de-liquid of squeezing with the speed of 85～200kg/min in the pulverizing described in step e.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210170730.7A CN102677509B (en) | 2012-05-29 | 2012-05-29 | Material preparation process for preparing dissolving pulp by modifying bleached needle leave wood and broadleaf wood composite pulp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210170730.7A CN102677509B (en) | 2012-05-29 | 2012-05-29 | Material preparation process for preparing dissolving pulp by modifying bleached needle leave wood and broadleaf wood composite pulp |
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| CN109629290A (en) * | 2018-12-25 | 2019-04-16 | 新疆富丽达纤维有限公司 | A kind of pulping production technology reducing dissolving pulp dosage |
| CN114605561A (en) * | 2020-12-03 | 2022-06-10 | 中国制浆造纸研究院有限公司 | Preparation method of acetate-grade wood pulp |
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| GB0413068D0 (en) * | 2004-06-11 | 2004-07-14 | Imerys Minerals Ltd | Treatment of pulp |
| CN101158125B (en) * | 2007-11-12 | 2010-05-19 | 宜宾长毅浆粕有限责任公司 | Paper-making grade softwood pulp plate modifying production technique |
| CN101148834B (en) * | 2007-11-12 | 2010-06-23 | 宜宾长毅浆粕有限责任公司 | Paper-making-stage broad-leaved wood pulp plate denaturalization producing technique |
| CN101158124A (en) * | 2007-11-12 | 2008-04-09 | 宜宾长毅浆粕有限责任公司 | Paper-making grade pulp bleaching plate modifying production technique |
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