CN102337700A - Pulping method of boiling grass fiber materials and sodium carbonate - Google Patents
Pulping method of boiling grass fiber materials and sodium carbonate Download PDFInfo
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- CN102337700A CN102337700A CN2011103196284A CN201110319628A CN102337700A CN 102337700 A CN102337700 A CN 102337700A CN 2011103196284 A CN2011103196284 A CN 2011103196284A CN 201110319628 A CN201110319628 A CN 201110319628A CN 102337700 A CN102337700 A CN 102337700A
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000009835 boiling Methods 0.000 title claims abstract description 50
- 229910000029 sodium carbonate Inorganic materials 0.000 title claims abstract description 28
- 244000025254 Cannabis sativa Species 0.000 title claims abstract description 26
- 238000004537 pulping Methods 0.000 title claims abstract description 25
- 239000002657 fibrous material Substances 0.000 title abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 105
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 105
- 239000001301 oxygen Substances 0.000 claims abstract description 105
- 238000005406 washing Methods 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000002002 slurry Substances 0.000 claims description 101
- 239000002994 raw material Substances 0.000 claims description 60
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 43
- 239000010902 straw Substances 0.000 claims description 38
- 238000010411 cooking Methods 0.000 claims description 32
- 239000000835 fiber Substances 0.000 claims description 31
- 230000035484 reaction time Effects 0.000 claims description 26
- 235000014676 Phragmites communis Nutrition 0.000 claims description 20
- 238000012216 screening Methods 0.000 claims description 19
- 238000010009 beating Methods 0.000 claims description 17
- 238000012805 post-processing Methods 0.000 claims description 12
- 229920000742 Cotton Polymers 0.000 claims description 10
- 240000008042 Zea mays Species 0.000 claims description 8
- 235000016383 Zea mays subsp huehuetenangensis Nutrition 0.000 claims description 8
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 8
- 235000009973 maize Nutrition 0.000 claims description 8
- 241000209140 Triticum Species 0.000 claims description 6
- 235000021307 Triticum Nutrition 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- 238000010025 steaming Methods 0.000 claims description 3
- 241001494508 Arundo donax Species 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 14
- 239000003513 alkali Substances 0.000 description 28
- 241000282326 Felis catus Species 0.000 description 24
- 238000005516 engineering process Methods 0.000 description 15
- 229920001131 Pulp (paper) Polymers 0.000 description 14
- 238000004061 bleaching Methods 0.000 description 14
- 238000002360 preparation method Methods 0.000 description 12
- 235000011121 sodium hydroxide Nutrition 0.000 description 11
- 241000219146 Gossypium Species 0.000 description 9
- 239000012141 concentrate Substances 0.000 description 9
- 241000196324 Embryophyta Species 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000009413 insulation Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 241000209094 Oryza Species 0.000 description 6
- 235000007164 Oryza sativa Nutrition 0.000 description 6
- 235000009566 rice Nutrition 0.000 description 6
- 229920002522 Wood fibre Polymers 0.000 description 5
- 239000004927 clay Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002023 wood Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000000284 extract Substances 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 241000883966 Astrophytum capricorne Species 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 229920005610 lignin Polymers 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000002025 wood fiber Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 240000000359 Triticum dicoccon Species 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 238000009960 carding Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 210000004209 hair Anatomy 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000005200 wet scrubbing Methods 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241001343274 Dichrostachys spicata Species 0.000 description 1
- 101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000009993 causticizing Methods 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- PVGBHEUCHKGFQP-UHFFFAOYSA-N sodium;n-[5-amino-2-(4-aminophenyl)sulfonylphenyl]sulfonylacetamide Chemical compound [Na+].CC(=O)NS(=O)(=O)C1=CC(N)=CC=C1S(=O)(=O)C1=CC=C(N)C=C1 PVGBHEUCHKGFQP-UHFFFAOYSA-N 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention relates to a pulping method of boiling grass fiber materials and sodium carbonate, which comprises the following steps: (1) preparing materials; (2) boiling;(3) defibering, and washing pulp; (4) carrying out oxygen delignification; and (5) carrying out post treatment, wherein the boiling step (2) comprises: uniformly mixing the prepared grass materials and a boiling liquid, adding into a boiling vessel according to a liquid ratio of (1:2.8)-(1:9), heating until the temperature is raised to 130-160 DEG C (preferably 130-145 DEG C), keeping the temperature for 0-60 minutes (preferably 30-45 minutes), and terminating the boiling step to obtain coarse pulp.
Description
Technical field
The invention belongs to field of papermaking, specifically, the present invention relates to a kind of pulping and papermaking method, in particular, what relate to is a kind of fibers in grass class raw material sodium carbonate pulping by cooking method.
Background technology
The plant fiber material of papermaking comprises: lumber fibre and non-wood fiber.
Lumber fibre is divided into needlebush and leaf wood, and two kinds of fiber form have very big difference.Needle-leaved wood fibre: because fibre length wherein is big, fiber is soft, and fine components contents seldom is prone to make high-intensity slurry, so needle-leaved wood fibre is the good raw material of papermaking.Broad-leaved wood fiber: because fiber is shorter, conduit and parenchyma cell content are higher, so paper strength not as softwood pulp, because interweaving of conduit and network of fibers is bad, be prone to produce the phenomenon of hair and powder dropping, but short and small deflection and the smoothness to page of fiber is favourable.
Non-wood fiber because the content of heteroproteose cell is higher, has many adverse influences to papermaking; Bad with fiber interweaving, influence the intensity of paper pulp, when the colony of heteroproteose cell during attached to paper; Dry linting falls hair easily, and the heteroproteose cell lignin content is high, is difficult for bleaching; Be prone to form the foxed spot point at paper, pulping and paper-making is worth low.Prior art it has been generally acknowledged that the unsetting tiny cell in the fibers in grass class is more; Acellular content is many; So the drainability of slurry is poor, strength of paper is also poor, and the strength of paper difference shows usually that fracture length numerical value is low, tearability numerical value is low and aspect such as the folding strength number of times is few.
For above-mentioned reasons; Now the maximum of paper grade (stock) are lumber fibres in the worldwide, and it is less that the grass kind plant fiber is used, still; Along with the shortage greatly of the forest reserves, it is a severe problem that faces now that what use is made of grass raw material prepares high-quality chemical pulp.
The grass kind plant pulping technique is a system engineering; Study the overall process of slurrying according to the inhomogeneity of grass fiber raw material biological structure and the particularity of chemical composition, existing method with grass kind plant production paper pulp has: chemical method, Mechanical Method, chemical mechanical pulping etc.Sodium carbonate slurrying belongs to the chemi-mechanical pulp category, by the effect of chemical agent, sloughs part lignin and heteroproteose cell, and the separation of fiber relies on machinery to discongest and oxygen delignification.、
It has been generally acknowledged that grass kind plant slurrying in the prior art if fiber dissociates fully, need be when carrying out boiling, keep the long boiling and the time of insulation, make slurry boil relatively " soft "; It is below 10 that being entitled as of for example on 1999 the 14th the 3rd phases of volume " Hubei Polytichnic College's journal ", delivering mentioned pulp hardness K value in " strengthening imagination and Preliminary Practice that dogstail is got the raw materials ready and reforms boiling " literary composition, the good 7-8 that reaches, and the one-tenth pulp yield is more than 50%; Good reaches 57%, and more than the fracture length 4000m, good reaches more than the 7000m; Can obtain the straw pulp Extended Delignification, the shallow good bleaching of pulping, intensity is good; Digester yield is high, can be energy-conservation, subtract advantages such as dirt, consumption reduction.And the inventive method is just the opposite, and boiling obtains permanganate number 32～40 (being equivalent to 52～65 card uncle valencys) ultrahigh hardness slurry, and yield is 62～70%, and this moment, the form of slurry was almost as broad as long with raw material, relied on mechanical force and oxygen delignification method to come defibre.
There are many technical staff to be devoted to improve the research of fibers in grass class pulping and digesting effect this respect; Like the production method of disclosed cotton stalk natural color chemomechanical pulp among the patent application CN200710115246.3 " a kind of continuous pulping method for cotton stalk natural color chemomechanical pulp ", raw material is through dry and wet stock preparation, and dehydration is measured; The extruding indentation is gone into the continuously cooking pipe and is added alkaline boiling; Boiling finishes raw material and relies on gravity to fall into high dense defibrator defibrination, after spurt to jetting storehouse, obtain natural color pulp through washing.This is a CTMP, and the quality of slurry and intensity and chemical pulp have very big difference.
The carding process of prior art is used in the process of preparation wood pulp usually, and like patent application CN200410023742.2, name is called the production method of disclosed chemical wood pulp in " a kind of production method of chemical wood pulp "; Comprise dipping, squeezing extrusion, delignification, said squeezing extrusion carried out before boiling, made the structure of wood chip become loose through this technology; The wood chip attenuation, bulk density diminishes, and forms the wood wool group of space network; Because it is big that the specific area that this wood wool is rolled into a ball becomes, and is easy to evenly absorb medicine, makes the corresponding quickening of delignification reaction speed; Reactant also is easy to stripping, and this stage reduces the consumption of boiling chemicals for strengthening the uniformly penetrating of cooking liquor; Reduce digestion time, and improve boiling pulping homogeneity.
It has been generally acknowledged that the slurry that makes for grass kind plant is more because of containing heteroproteose cell, and half fiber content is also many, easy aquation, water filtering performance is poor with respect to wood pulp, relatively is difficult to washing.When the slurry hardness that obtains after the boiling traditionally was high, because the viscosity of slurry is little, water filtering performance was good when causing beginning; But last wash degree is relatively poor, and this is because there is fibrous inside in a part of waste liquid when boiling, for the high slurry of hardness; Fiber destruction is few, inner waste liquid mainly be by in the lumen to external diffusion, the paper pulp that hardness is high; Intrastitial waste liquid diffusional resistance is just big, difficult more washing.The present invention utilizes carding process, at first rubs fiber with the hands and opens, and the black liquor in the lumen is exposed, and improves the extraction of black liquor greatly.
In addition, how removing lignin effectively, also is a key issue of fibers in grass class slurrying.The method of oxygen delignification generally is used to prepare wood pulp, is the less technology of a kind of environmental pollution, and very high delignification rate is arranged, and is less relatively to the destruction of fiber.If but were used to prepare grass kind plant slurry, because grass fiber is in middle concentration is carried, beating degree would improve too high, has a strong impact on the water filtering performance of straw pulp.The slurry of the present invention's preparation is suitable for using oxygen delignification technology, can produce high-intensity paper pulp.The general less grass kind plant slurry that is used to prepare of oxygen delignification.
Summary of the invention
The object of the invention is to provide a kind of fibers in grass class raw material sodium carbonate pulping by cooking method, and said method can reduce or eliminate the secondary pollution of chemical recovery system white clay, simplifies straw pulp alkali simultaneously and reclaims causticization and white clay recovery system.
To achieve these goals, the present invention takes following technical scheme:
A kind of fibers in grass class raw material sodium carbonate pulping by cooking method, said method comprise the steps: that (1) get the raw materials ready; (2) boiling; (3) discongest also pulp washing; (4) post processing;
Wherein the said boiling of step (2) comprises: after grass raw material after step (1) is got the raw materials ready and cooking liquor mix, add in the boiling vessel sodium carbonate amount 15-22%; Liquor ratio 1: 2.8～1: 9, heating also heats up, and is warming up to 130～160 ℃; Preferred 130-145 ℃, and be incubated 0～60min, preferred 30-45min; Boiling finishes, and is slightly starched.
Wherein said getting the raw materials ready can be with reference to any getting the raw materials ready in the prior art slurrying, and those skilled in the art need not to pay more creative work to this can realize the object of the invention.
Yet the present invention preferably gets the raw materials ready and comprises that the dogstail raw material is through dry method cut-out, pulverizing and dedusting.
Or on above-mentioned dry method cut-out, pulverizing and dedusting basis, carry out wet scrubbing again and rubbing is handled, dewater then and push.
Above-mentioned extruding is preferably and is squeezed to more than mass dryness fraction 35 degree, and more preferably 35～45 degree most preferably are the 40-42 degree.
According to foregoing method, described grass raw material of preferred steps (2) and cooking liquor mix, and cooking liquor temperature wherein is 60～95 ℃.
According to foregoing method, the thick slurry pH after the said boiling of step (2) finishes is 9～12, is preferably 10～11.
According to foregoing method, the said digesting apparatus of step (2) steams for adopting rotary spherical digester and transverse tube to connect, and perhaps adopts intermittently vertically digesting, or vertical continuous steamer;
When adopting rotary spherical digester and transverse tube even to steam, liquor ratio is 1: 2.8～1: 4;
When adopting intermittently vertically digesting or vertical company to steam, liquor ratio is 1: 6～1: 9.
According to foregoing method, step (3) is said to be discongested is that slurry to step (2) obtains carries out mechanical jordaning, and the starch degree that obtains after discongesting is a permanganate number 30～40, is preferably 30～36; Said pulp washing carries out black liquid extraction for the ultrahigh hardness slurry that will discongest after the end, and clean slurry concentration is 8～12%.
Promptly pass through following steps: get the raw materials ready (1); (2) boiling; (3) discongest also pulp washing; (4) the starch degree that obtains after the post processing is a permanganate number 30～40, is preferably 30～36.
Described extraction black liquor is this area conventional means, and those skilled in the art need not to pay more creative works to this can realize the object of the invention.
Described discongesting can be any the discongesting in the slurrying of this area, for example discongests through mechanical force, and the equipment of discongesting can be screw extruder, fluffer, disc mill and Var-nip press, preferred fluffer and single-deck grinding machine.
According to foregoing method, the slurry beating degree that obtains after said the discongesting of step (3) is 22～38 ° of SR.
The present invention also can be preferably, and after the described boiling of step (2) finished, the thick slurry that before described the discongesting of step (3), boiling is obtained concentrated.
Preferably said thick slurry being concentrated to concentration is 15～25%.
Said concentrating can be adopted concentrated means any in the state of the art, and what preferably adopt is extrusion spiral.
According to foregoing method, discongesting and after pulp washing finishes, and before the post processing of step (4), also comprise the oxygen delignification step in step (3).
That is to say that described method comprises the steps: to get the raw materials ready; Boiling; Discongest and pulp washing; Oxygen delignification; Post processing;
And obtain chemical pulp;
Perhaps for not comprising the oxygen delignification step, promptly said method comprises the steps: that (1) get the raw materials ready; (2) boiling; (3) discongest also pulp washing; (4) post processing;
And obtain semi-chemical pulp.
Said oxygen delignification preferably includes: with obtain behind step (3) pulp washing clean after slurry send into the oxygen delignification tower, slurry is heated to 90～120 ℃, add NaOH and oxygen, tower top pressure is kept 0.4～0.5Mpa, reaction time 120～330min.
Described oxygen delignification can select for use single hop or multistage oxygen to take off technology.
According to foregoing method, said NaOH weight consumption is 6～12% of the slurry weight of cleaning that obtains behind step (3) pulp washing; Said flow of oxygen is that the slurry of cleaning that obtains behind step per ton (3) pulp washing uses 50～100kg oxygen.
According to foregoing method, be 3～10 through the slurry permanganate number that obtains after step (4) post processing, whiteness 40～62%, fracture length 4.5～7.0km, tearability 200～248mN, folding strength 15～30 times.
Promptly get the raw materials ready through step; Boiling; Discongest and pulp washing; Oxygen delignification; The slurry permanganate number that obtains after the post processing is 3～10, whiteness 40～62%, fracture length 4.5～7.0km, tearability 200～248mN, folding strength 15～30 times.
According to foregoing method, the combination of one or more during the said post processing of step (4) comprises washing, screening, purifies or bleaches.
Wherein be preferably and comprise that washing, screening, purification obtain natural-color straw pulp.
Perhaps be preferably and comprise washing, screening, obtain bleached pulp through bleaching after purifying.
According to foregoing method, described cooking liquor comprises green liquor;
Even, also can in green liquor, add at least a in water, black liquor or the NaOH for further regulator solution ratio.
For example, can add black liquor for green liquor; Can also add black liquor and NaOH for green liquor; Can also add NaOH and water for green liquor; Can also add black liquor and water for green liquor; Even can also add water for green liquor.
When adding water or NaOH, those skilled in the art can be according to the kind of boiling raw material, and the component of required product performance and green liquor regulates, and need not to pay more creative work.
Described black liquor is this area black liquor commonly used, and the composition of said black liquor has no influence to the realization of the object of the invention, and those skilled in the art's liquor ratio disclosed according to the present invention can not paid any creative work and learn easily.
Carbonate content is 95-260g/L in the said green liquor, and containing sodium hydrate content is 0～4%, and described percentage is the percentage by weight of relative bone dry fiber raw material; Green liquor pH value is 10.3～10.6.
Cooking liquor of the present invention is preferably the green liquor that adopts soda pulping process, sodium carbonate method boiling, black liquor produce, pass through purified treatment in combustion process after.
More concrete for example is; Said green liquor does; The black liquor solid of alkaline process and green liquor boiling inorganic matter in alkali stove combustion process is converted into sodium carbonate and is melted in furnace bottom and forms bed course; Get into dissolving tank when fused mass flows out from bed course, fused mass is dissolved in and generates green liquor--sodium carbonate liquor in the liquid.
According to foregoing method, said sodium carbonate is for to use granularity to be raw material less than the sodium carbonate of 40ppm.
According to foregoing method, described fibers in grass class raw material is one or more the combination in straw, wheat straw, maize straw, cotton stalk, reed or the giantreed.
Technical scheme of the present invention has following advantage:
(1) simple to operate, be convenient to suitability for industrialized production;
(2) can reduce even eliminate the secondary pollution of chemical recovery system white clay;
(3) straw pulp alkali be can simplify and causticization and white clay recovery system reclaimed.
Generally; Sodium carbonate 85% in the green liquor wants causticization to become NaOH; NaOH is back to boiling, the causticizing reaction equation:
Calcium carbonate (white clay) does not have the processing method of mature and reliable at present, can only abandon or bury, and causes secondary pollution.
The present invention Na that filtrates
2C0
3All be back to boiling, so a small amount of causticization is pollution abatement.Because it is traditional about 20% that the causticization amount has only, equipment significantly reduces with investment.
The specific embodiment
Below with embodiment technical scheme of the present invention is further described; To help advantage to technical scheme of the present invention; Effect has understanding further, and embodiment does not limit protection scope of the present invention, and protection scope of the present invention is decided by claim.
Embodiment 1
Selecting wheat straw to connect as raw material, transverse tube steams.Adopt dry and wet stock preparation, raw material is cut off in chaffcutter, after the dedusting of goat's horn deduster, spiral dehydration, metering, get into the scroll feeder extruding and form the material plug; When material enters macerator; The material of wheat straw is filled in rapid expansion absorption cooking liquor, and cooking liquor is made up of black liquor, green liquor and a spot of alkali lye, sodium carbonate amount 18%; Sodium hydroxide concentration 2%, liquor ratio 1: 3.5.Connect in the steaming device at transverse tube, 150 ℃ of boiling maximum temperatures were spurted concentration in the press master after 20 minutes, and the thick slurry entering fluffer that obtains concentration 20-22% carries out fiber and dissociates.
Slurry after dissociating is transferred dense, gets into the oxygen delignification unit after extracting black liquor through vacuum pulp washing machine, adopts three sections continuous oxygen to take off technology, one section alkali charge 2.5%, oxygen consuming amount 25Kg, 100 ℃ of temperature, cat head oxygen pressure 0.3MPa, reaction time 60min; Two sections alkali charges 2.0%, oxygen consuming amount 25Kg, 110 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 60min; Three sections alkali charges 2.0%, oxygen consuming amount 20Kg (all to advancing slurry), 120 ℃ of temperature, cat head oxygen is pressed 0.4MPa, and reaction time 90min, oxygen take off terminal point PH 9.5～10.4.
Slurry after oxygen takes off washs, after three sections screenings of one-level, four sections desanding of one-level and decker concentrate, obtains natural-color straw pulp through two sections vacuum pulp washing machines.
Natural-color straw pulp is carried out traditional DEP bleaching operation, obtain bleaching straw pulp.
The index of bleaching straw pulp is: fracture length is 5000m, and tearability is 250mN, and whiteness is 78%ISO, and folding number is 28 times, and beating degree is 32 ° of SR.
Embodiment 2
With straw raw material, rotary spherical digester boiling.Remove the mildew and rot part in the straw, cut that the reed machine cuts off, get into the preimpregnation spiral after the dedusting of goat's horn deduster through five cuttves, and evenly mix with cooking liquor.Cooking liquor is made up of black liquor and green liquor, sodium carbonate amount 20%, liquor ratio 1: 3.
Logical steam 40min in rotary spherical digester, ball internal pressure 0.4MPa carries out little steam bleeding operation, lasts 20min, makes the ball internal pressure drop to 0.05MPa by 0.4MPa, continues logical vapour to ball internal pressure 5.0MPa then, spurts to jetting storehouse behind the pressurize 20min.
Slurry in the jetting storehouse is pushed the single-screw press master by conveying worm, and the slurry of concentration 25% is discongested pulping through disc mill behind the extruding black liquor, the slurry hardness 35K of this moment.
Slurry after discongesting gets into the oxygen delignification unit after extracting black liquor through Var-nip press, adopts four sections continuous oxygen to take off technology, one section alkali charge 3%, oxygen consuming amount 30Kg, 90 ℃ of temperature, cat head oxygen pressure 0.4MPa, reaction time 60min; Two sections alkali charges 2.0%, oxygen consuming amount 25Kg, 110 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 60min; Three sections alkali charges 2.0%, oxygen consuming amount 20Kg, 110 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 60min, four sections alkali charges 1.5%, oxygen consuming amount 20Kg (all to advancing slurry), 120 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 90min.
Slurry after oxygen takes off through two sections Var-nip press wash, three sections screenings of one-level, three sections desanding of one-level and concentrate after, obtain the true qualities rice straw pulp.
The index of true qualities rice straw pulp is: fracture length is 4900 meters, and tearability is 220mN, and whiteness is 46%ISO, and folding number is 32 times, and beating degree is 35 ° of SR.
Embodiment 3
The selection reed is a raw material, the batch cooking of upright pot.Adopt dry raw material preparation, in beater grinder raw material be cut off, draw down, rubbing slabbing, thread, through selection by winnowing, screening, dedusting, edulcoration rate reaches 28%.
Get the reed of material ready; Pack in the batch (-type) digester and controlled liquor ratio 1: 8 through belt conveyer, with 150 ℃ of hot green liquors dress pots of amount of 22% sodium carbonate, ON cycle heating system; Cooking liquor is heated to 150 ℃; In digester, feed the cold black liquid displacement behind the insulation 15min,, be sprayed onto jetting storehouse with spurting pump when black liquor temperature stops displacement during less than 95 ℃.
Slurry in the jetting storehouse is pushed Double screw pulp extruder by conveying worm, and the slurry of concentration 20% is discongested pulping through deflaker behind the extruding black liquor, the slurry hardness 37K of this moment.
Slurry after discongesting gets into the oxygen delignification unit after extracting black liquor through vacuum pulp washing machine, adopts four sections continuous oxygen to take off technology, one section alkali charge 4%, oxygen consuming amount 30Kg, 110 ℃ of temperature, cat head oxygen pressure 0.4MPa, reaction time 60min; Two sections alkali charges 3.0%, oxygen consuming amount 25Kg, 110 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 60min; Three sections alkali charges 2.0%, oxygen consuming amount 20Kg, 120 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 60min, four sections alkali charges 1.5%, H202 consumption 2%, oxygen consuming amount 20Kg (all to advancing slurry), 120 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 90min.
Slurry after oxygen takes off through two sections vacuum pulp washing machines wash, three sections screenings of one-level, three sections desanding of one-level and concentrate after, obtain the true qualities reed pulp.
The true qualities reed pulp is carried out traditional DEP bleaching operation, obtain bleached reed pulp.
The index of bleached reed pulp is: fracture length is 6500 meters, and tearability is 260mN, and whiteness is 81%ISO, and folding number is 30 times, and beating degree is 28 ° of SR.
Embodiment 4
The selection maize straw is a raw material, vertical continuously cooking.Adopt dry and wet stock preparation, in chaffcutter automatically maize straw be cut off, draw down, rubbing slabbing, thread, through the railroad duster dedusting, edulcoration rate reaches 22%.
Raw material after the dedusting gets into the waterpower Straw-crumbling machine and carries out wet scrubbing; Spiral dehydration metering back forms the material plug through the scroll feeder extruding; When entering rapid expansion of macerator, evenly mixes in material with quick the suction also of cooking liquor; Cooking liquor is made up of black liquor and green liquor, sodium carbonate amount 15%, and liquor ratio was controlled at 1: 8.5.
The ON cycle heating system; Cooking liquor is heated to 145 ℃; In connecting steamer, feed the cold black liquid displacement behind the insulation 30min,, rely on pot inner pressure to deliver to extrusion spiral to slurry when the cooking liquor temperature stops displacement during less than 95 ℃; The slurry of concentration 25% is discongested pulping through grinding machine behind the extruding black liquor, the slurry hardness 35K of this moment.
Slurry after discongesting gets into the oxygen delignification unit after extracting black liquor through vacuum pulp washing machine, adopts three sections continuous oxygen to take off technology, one section alkali charge 3%, oxygen consuming amount 25Kg, 90 ℃ of temperature, cat head oxygen pressure 0.35MPa, reaction time 60min; Two sections alkali charges 2.5%, oxygen consuming amount 25Kg, 100 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 60min; Three sections alkali charges 2.0%, oxygen consuming amount 20Kg (all to advancing slurry), 120 ℃ of temperature, cat head oxygen is pressed 0.4MPa, and reaction time 90min, oxygen take off terminal point PH 9.5～10.3.
Slurry after oxygen takes off through two sections vacuum pulp washing machines wash, three sections screenings of one-level, three sections desanding of one-level and concentrate after, obtain true qualities maize straw slurry.
The index of true qualities reed pulp is: fracture length is 4800 meters, and tearability is 210mN, and whiteness is 45%ISO, and folding number is 20 times, and beating degree is 35 ° of SR.
Embodiment 5
The straw of selection 40% and 60% wheat straw blended fiber are raw material, the rotary spherical digester boiling.Mixed material gets into the preimpregnation spiral after cutting the cut-out of reed machine, the dedusting of goat's horn deduster through five cuttves, and evenly mixes with cooking liquor.Cooking liquor is made up of black liquor and green liquor, sodium carbonate amount 20%, liquor ratio 1: 3.
Logical steam 40min in rotary spherical digester, ball internal pressure 0.4MPa carries out little steam bleeding operation, lasts 20min, makes the ball internal pressure drop to 0.05MPa by 0.4MPa, continues logical vapour to ball internal pressure 5.0MPa then, spurts to jetting storehouse behind the pressurize 20min.
Slurry in the jetting storehouse is pushed Double screw pulp extruder by conveying worm, and the slurry of concentration 20% is discongested pulping through disc mill behind the extruding black liquor, the slurry hardness 30K of this moment.
Slurry after discongesting gets into the oxygen delignification unit after extracting black liquor through Var-nip press, adopts two sections continuous oxygen to take off technology, one section alkali charge 4%, oxygen consuming amount 30Kg, 100 ℃ of temperature, cat head oxygen pressure 0.4MPa, reaction time 90min; Two sections alkali charges 3.0%, H202 consumption 2%, oxygen consuming amount 25Kg (all to advancing slurry), 120 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 90min.
Slurry after oxygen takes off through two sections Var-nip press wash, three sections screenings of one-level, three sections desanding of one-level and concentrate after, obtain true qualities rice wheat straw mixed pulp.
The index of true qualities rice wheat straw mixed pulp is: fracture length is 4600 meters, and tearability is 200mN, and whiteness is 42%ISO, and folding number is 18 times, and beating degree is 35 ° of SR.
Embodiment 6
Select cotton stalk as raw material, intermittently vertically digesting.Adopt dry raw material preparation, in beater grinder, be cut off, draw down, rubbing slabbing, thread, selection by winnowing, screening, dedusting, edulcoration rate reaches 28%.
Cotton stalk after getting the raw materials ready is packed in the batch (-type) digester and was controlled liquor ratio 1: 4, sodium carbonate amount 22% through belt conveyer.Open admission valve, cooking liquor and material are heated to 150 ℃, erupt in the jetting storehouse behind the insulation 30min.
Slurry in the jetting storehouse is pushed Double screw pulp extruder by conveying worm, and the slurry of concentration 28% is discongested pulping through deflaker behind the extruding black liquor, the slurry hardness 35K of this moment.
Slurry after discongesting gets into the oxygen delignification unit after extracting black liquor through vacuum pulp washing machine, adopts four sections continuous oxygen to take off technology, one section alkali charge 4%, oxygen consuming amount 30Kg, 110 ℃ of temperature, cat head oxygen pressure 0.4MPa, reaction time 60min; Two sections alkali charges 3.0%, oxygen consuming amount 25Kg, 110 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 60min; Three sections alkali charges 2.0%, oxygen consuming amount 20Kg, 120 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 60min, four sections alkali charges 1.5%, oxygen consuming amount 20Kg (all to advancing slurry), 120 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 90min.
Slurry after oxygen takes off through two sections vacuum pulp washing machines wash, three sections screenings of one-level, three sections desanding of one-level and concentrate after, obtain the true qualities cotton stem pulp.
The true qualities cotton stem pulp is carried out traditional DEP bleaching operation, obtain the bleaching cotton stalk pulp.
The index of bleaching cotton stalk pulp is: fracture length is 5000m, and tearability is 220mN, and whiteness is 78%ISO, and folding number is 16 times, 28 ° of SR of beating degree.
Embodiment 7
Select straw as raw material, intermittently vertically digesting.Adopt dry raw material preparation, be cut off in the disintegrating machine automatically, pulverizing, dedusting, edulcoration rate reaches 30.
Raw material after getting the raw materials ready is packed in the intermittently upright pot and was controlled liquor ratio 1: 2.8, sodium carbonate amount 18% through belt conveyer.Open admission valve, cooking liquor and material are heated to 160 ℃, finish boiling, the pH value is 10.8, erupts in the jetting storehouse then.
Slurry in the jetting storehouse is pushed Double screw pulp extruder by conveying worm, and the slurry of concentration 18% is discongested pulping through deflaker behind the extruding black liquor, the slurry hardness 32K of this moment, and beating degree is 31 ° of SR.Ultrahigh hardness slurry after discongesting extracts the slurry that obtains cleaning after night, and concentration is 8%.
Slurry after discongesting through getting into the oxygen delignification unit behind the vacuum pulp washing machine extraction black liquor, adopts single hop oxygen to take off technology, alkali charge 9%, oxygen consuming amount 60Kg, and 110 ℃ of temperature, cat head oxygen is pressed 0.4MPa, reaction time 120min.
Slurry after oxygen takes off through three sections vacuum pulp washing machines wash, three sections screenings of one-level, three sections desanding of one-level and concentrate after, obtain the true qualities rice straw pulp.
The true qualities rice straw pulp is carried out oxygen float operation, obtain the bleaching rice straw pulp.
The index of bleaching rice straw pulp is: fracture length is 4400 meters, and tearability is 210mN, and whiteness is 72%ISO, and folding number is 15 times, 34 ° of SR of beating degree.
Embodiment 8
Select reed as raw material, the rotary spherical digester boiling.Adopt dry raw material preparation, in cutting the reed machine reed be cut off, selection by winnowing, screening, dedusting, edulcoration rate reaches 24%.
Raw material after getting the raw materials ready is packed in the rotary spherical digester and was controlled liquor ratio 1: 3, sodium carbonate amount 22% through belt conveyer.Open admission valve, cooking liquor and material are heated to 150 ℃, insulation 10min, it is 11 that boiling finishes back pH value, erupts in the jetting storehouse then.
Slurry in the jetting storehouse is pushed Double screw pulp extruder by conveying worm, and the slurry of concentration 22% is discongested pulping through deflaker behind the extruding black liquor, the slurry hardness 35K of this moment, and beating degree is 22 ° of SR.Ultrahigh hardness slurry after discongesting extracts the slurry that obtains cleaning after night, and concentration is 12%.
Slurry after discongesting through getting into the oxygen delignification unit behind the vacuum pulp washing machine extraction black liquor, adopts single hop oxygen to take off technology, alkali charge 10%, oxygen consuming amount 50Kg, and 120 ℃ of temperature, cat head oxygen is pressed 4.2MPa, reaction time 240min.
Slurry after oxygen takes off obtains the true qualities reed pulp through after the washing of single hop vacuum pulp washing machine, three sections screenings of one-level, three sections desanding of one-level and concentrating.
This reed pulp is carried out chlorine float operation, obtain the bleaching reed pulp.
The index of bleaching reed pulp is: fracture length is 5500 meters, and tearability is 220mN, and whiteness is 76%ISO, and folding number is 18 times, 26 ° of SR of beating degree.
Embodiment 9
The mixture of selecting straw and wheat straw is as raw material, continuous vertically digesting.Adopt wet feed preparation, in beater grinder, be cut off, draw down, rubbing slabbing, thread, selection by winnowing, screening, dedusting, edulcoration rate reaches 26%.
Raw material after getting the raw materials ready is packed into continuously in the upright pot and was controlled liquor ratio 1: 7, sodium carbonate amount 18% through the feeder in the wet feed preparation.Open admission valve, cooking liquor and material are heated to 145 ℃, insulation 20min, it is 9.7 that boiling finishes back pH value, erupts in the jetting storehouse then.
Slurry in the jetting storehouse is pushed Double screw pulp extruder by conveying worm, and the slurry of concentration 18% is discongested pulping through deflaker behind the extruding black liquor, the slurry hardness 34K of this moment, and beating degree is 30 ° of SR.Ultrahigh hardness slurry after discongesting extracts the slurry that obtains cleaning after night, and concentration is 9%.
Slurry after discongesting through getting into the oxygen delignification unit behind the vacuum pulp washing machine extraction black liquor, adopts single hop oxygen to take off technology, alkali charge 12%, oxygen consuming amount 90Kg, and 100 ℃ of temperature, cat head oxygen is pressed 5.0MPa, reaction time 200min.
Slurry after oxygen takes off through three sections vacuum pulp washing machines wash, three sections screenings of one-level, three sections desanding of one-level and concentrate after, obtain the true qualities mixed pulp.
The index of the true qualities mixed pulp that obtains is: fracture length is 4600 meters, and tearability is 200mN, and whiteness is 42%ISO, and folding number is 12 times, 36 ° of SR of beating degree.
Embodiment 10
Select maize straw as raw material, intermittently vertically digesting.Adopt dry raw material preparation, in beater grinder, be cut off, draw down, rubbing slabbing, thread, selection by winnowing, screening, dedusting, edulcoration rate reaches 32%.
Raw material after getting the raw materials ready is packed in the intermittently upright pot and was controlled liquor ratio 1: 9, sodium carbonate amount 15% through belt conveyer.Open admission valve, cooking liquor and material are heated to 130 ℃, insulation 30min, it is 9 that boiling finishes back pH value, erupts in the jetting storehouse then.
Slurry in the jetting storehouse is pushed Double screw pulp extruder by conveying worm, and the slurry of concentration 18% is discongested pulping through deflaker behind the extruding black liquor, the slurry hardness 30K of this moment, and beating degree is 35 ° of SR.Ultrahigh hardness slurry after discongesting extracts the slurry that obtains cleaning after night, and concentration is 12%.
Slurry after discongesting through getting into the oxygen delignification unit behind the vacuum pulp washing machine extraction black liquor, adopts single hop oxygen to take off technology, alkali charge 8%, oxygen consuming amount 100Kg, and 90 ℃ of temperature, cat head oxygen is pressed 4.8MPa, reaction time 270min.
Slurry after oxygen takes off through two sections vacuum pulp washing machines wash, three sections screenings of one-level, three sections desanding of one-level and concentrate after, obtain true qualities maize straw slurry.
The index of true qualities maize straw slurry is: fracture length is 4600 meters, and tearability is 210mN, and whiteness is 48%ISO, and folding number is 13 times, 36 ° of SR of beating degree.
Claims (13)
1. fibers in grass class raw material sodium carbonate pulping by cooking method, said method comprise the steps: that (1) get the raw materials ready; (2) boiling; (3) discongest also pulp washing; (4) post processing;
It is characterized in that wherein the said boiling of step (2) comprises: after grass raw material after step (1) is got the raw materials ready and cooking liquor mix, add in the boiling vessel; Sodium carbonate amount 15-22%, liquor ratio 1: 2.8～1: 9, heating also heats up; Be warming up to 130～160 ℃, preferred 130-145 ℃, and be incubated 0～60min; Preferred 30-45min, boiling finishes, and is slightly starched.
2. method according to claim 1 is characterized in that, the thick slurry pH after the said boiling of step (2) finishes is 9～12, is preferably 10～11.
3. method according to claim 1 is characterized in that, the said boiling of step (2) is steamed for adopting rotary spherical digester or transverse tube to connect, perhaps for adopting intermittently vertically digesting, perhaps for adopting the vertical steaming device boiling that connects;
When adopting rotary spherical digester or transverse tube even to steam, liquor ratio is 1: 2.8～1: 4;
When adopting intermittently upright pot or vertical even steaming device boiling, liquor ratio is 1: 6～1: 9.
4. method according to claim 1 is characterized in that, step (3) is said to be discongested is that slurry to step (2) obtains carries out mechanical jordaning, and the starch degree that obtains after discongesting is a permanganate number 30～40, is preferably 30～36; Said pulp washing carries out black liquid extraction for the ultrahigh hardness slurry that will discongest after the end, and clean slurry concentration is 8～12%.
5. method according to claim 4 is characterized in that, the slurry beating degree that obtains after said the discongesting of step (3) is 22～38 ° of SR.
6. method according to claim 1 is characterized in that, discongesting and after pulp washing finishes, and before the post processing of step (4), also comprise the oxygen delignification step in step (3); Perhaps do not comprise the oxygen delignification step.
7. method according to claim 6; It is characterized in that; Said oxygen delignification comprises: the clean disposed slurry that obtains behind step (3) pulp washing is sent into the oxygen delignification tower, slurry is heated to 90～120 ℃, add NaOH and oxygen; Tower top pressure is kept 0.4～0.5Mpa, reaction time 120～330min.
8. method according to claim 7 is characterized in that, said NaOH weight consumption is 6～12% of the slurry weight of cleaning that obtains behind step (3) pulp washing; Said flow of oxygen is that the slurry of cleaning that obtains behind step per ton (3) pulp washing uses 50～100kg oxygen.
9. according to claim 7 or 8 described methods, it is characterized in that, is 3～10 through the slurry permanganate number that obtains after step (4) post processing, whiteness 40～62%, fracture length 4.5～7.0km, tearability 200～248mN, folding strength 10～30 times.
10. method according to claim 1 is characterized in that, the combination of one or more during the said post processing of step (4) comprises washing, screening, purifies or bleaches.
11. according to any described method of claim 1～10; It is characterized in that; Described cooking liquor comprises green liquor, preferably also comprises at least a in black liquor or the NaOH, and carbonate content is 95-260g/L in the said green liquor; Sodium hydroxide concentration is 0～4%, and green liquor pH value is 10.3～10.6.
12. method according to claim 11 is characterized in that, said sodium carbonate is for to use granularity to be raw material less than the sodium carbonate of 40ppm.
13., it is characterized in that described fibers in grass class raw material is one or more the combination in straw, wheat straw, maize straw, cotton stalk, reed or the giantreed according to any described method of claim 1～10.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194505A (en) * | 2013-03-27 | 2013-07-10 | 北京林业大学 | Enzyme hydrolysis saccharification method for furfural residue pretreatment by using green liquor |
| CN104131483A (en) * | 2014-06-06 | 2014-11-05 | 四川省西龙生物质材料科技有限公司 | High-yield high-performance bamboo fiber material prepared from bamboo used as raw material and preparation method thereof |
| CN105401477A (en) * | 2015-10-28 | 2016-03-16 | 昆明理工大学 | Method for improving beating degree and strength through intensive defibering |
| CN108316029A (en) * | 2018-02-27 | 2018-07-24 | 徐州工程学院 | A kind of High-efficiency straw utilizes method and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101177921A (en) * | 2007-12-12 | 2008-05-14 | 中冶纸业银河有限公司 | Continuous pulping method for cotton stalk natural color chemomechanical pulp |
| CN102154906A (en) * | 2011-04-20 | 2011-08-17 | 山东泉林纸业有限责任公司 | Paper pulp prepared from maize straw, preparation method thereof and paper product prepared from paper pulp |
-
2011
- 2011-10-20 CN CN201110319628.4A patent/CN102337700B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101177921A (en) * | 2007-12-12 | 2008-05-14 | 中冶纸业银河有限公司 | Continuous pulping method for cotton stalk natural color chemomechanical pulp |
| CN102154906A (en) * | 2011-04-20 | 2011-08-17 | 山东泉林纸业有限责任公司 | Paper pulp prepared from maize straw, preparation method thereof and paper product prepared from paper pulp |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194505A (en) * | 2013-03-27 | 2013-07-10 | 北京林业大学 | Enzyme hydrolysis saccharification method for furfural residue pretreatment by using green liquor |
| CN104131483A (en) * | 2014-06-06 | 2014-11-05 | 四川省西龙生物质材料科技有限公司 | High-yield high-performance bamboo fiber material prepared from bamboo used as raw material and preparation method thereof |
| CN104131483B (en) * | 2014-06-06 | 2018-09-28 | 四川环龙新材料有限公司 | A kind of high yield pulp1 high-performance bamboo fiber material and preparation method thereof prepared as raw material using bamboo |
| CN105401477A (en) * | 2015-10-28 | 2016-03-16 | 昆明理工大学 | Method for improving beating degree and strength through intensive defibering |
| CN108316029A (en) * | 2018-02-27 | 2018-07-24 | 徐州工程学院 | A kind of High-efficiency straw utilizes method and system |
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