CN109024032A - A method of collaboration processing improves oxygen alkali pulping effect - Google Patents
A method of collaboration processing improves oxygen alkali pulping effect Download PDFInfo
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- CN109024032A CN109024032A CN201810735609.1A CN201810735609A CN109024032A CN 109024032 A CN109024032 A CN 109024032A CN 201810735609 A CN201810735609 A CN 201810735609A CN 109024032 A CN109024032 A CN 109024032A
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- over dry
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- 239000001301 oxygen Substances 0.000 title claims abstract description 48
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 48
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000004537 pulping Methods 0.000 title claims abstract description 40
- 239000003513 alkali Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000000694 effects Effects 0.000 title claims abstract description 14
- 238000009835 boiling Methods 0.000 claims abstract description 36
- 239000002994 raw material Substances 0.000 claims abstract description 34
- 150000003254 radicals Chemical class 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000010411 cooking Methods 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 238000001125 extrusion Methods 0.000 claims abstract description 13
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims description 44
- 239000000463 material Substances 0.000 claims description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000002585 base Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-O oxonium Chemical compound [OH3+] XLYOFNOQVPJJNP-UHFFFAOYSA-O 0.000 claims description 22
- CSNNHWWHGAXBCP-UHFFFAOYSA-L magnesium sulphate Substances [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 18
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 16
- 239000000654 additive Substances 0.000 claims description 15
- 230000000996 additive effect Effects 0.000 claims description 15
- 239000003223 protective agent Substances 0.000 claims description 12
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 12
- 150000004676 glycans Chemical class 0.000 claims description 10
- 229920001282 polysaccharide Polymers 0.000 claims description 10
- 239000005017 polysaccharide Substances 0.000 claims description 10
- 238000010792 warming Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 229920002472 Starch Polymers 0.000 claims description 8
- 238000004064 recycling Methods 0.000 claims description 8
- 235000019698 starch Nutrition 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 238000010009 beating Methods 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- GVJHHUAWPYXKBD-UHFFFAOYSA-N (±)-α-Tocopherol Chemical compound OC1=C(C)C(C)=C2OC(CCCC(C)CCCC(C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-UHFFFAOYSA-N 0.000 claims description 6
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000010902 straw Substances 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 3
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 claims description 3
- 229930195725 Mannitol Natural products 0.000 claims description 3
- 241000209140 Triticum Species 0.000 claims description 3
- 235000021307 Triticum Nutrition 0.000 claims description 3
- 229930003268 Vitamin C Natural products 0.000 claims description 3
- 229930003427 Vitamin E Natural products 0.000 claims description 3
- WIGCFUFOHFEKBI-UHFFFAOYSA-N gamma-tocopherol Natural products CC(C)CCCC(C)CCCC(C)CCCC1CCC2C(C)C(O)C(C)C(C)C2O1 WIGCFUFOHFEKBI-UHFFFAOYSA-N 0.000 claims description 3
- 235000010355 mannitol Nutrition 0.000 claims description 3
- 239000000594 mannitol Substances 0.000 claims description 3
- 235000019154 vitamin C Nutrition 0.000 claims description 3
- 239000011718 vitamin C Substances 0.000 claims description 3
- 235000019165 vitamin E Nutrition 0.000 claims description 3
- 229940046009 vitamin E Drugs 0.000 claims description 3
- 239000011709 vitamin E Substances 0.000 claims description 3
- 241001061264 Astragalus Species 0.000 claims description 2
- 241001349804 Juncus alpinoarticulatus Species 0.000 claims description 2
- 235000006533 astragalus Nutrition 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 210000004233 talus Anatomy 0.000 claims description 2
- 235000002710 Ilex cornuta Nutrition 0.000 claims 1
- 241001310146 Ilex cornuta Species 0.000 claims 1
- 235000010326 Osmanthus heterophyllus Nutrition 0.000 claims 1
- 240000000111 Saccharum officinarum Species 0.000 claims 1
- 235000007201 Saccharum officinarum Nutrition 0.000 claims 1
- 239000002893 slag Substances 0.000 claims 1
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 150000001720 carbohydrates Chemical class 0.000 description 12
- 235000014633 carbohydrates Nutrition 0.000 description 12
- 229920005610 lignin Polymers 0.000 description 9
- 238000004061 bleaching Methods 0.000 description 8
- 239000002023 wood Substances 0.000 description 8
- 241000609240 Ambelania acida Species 0.000 description 5
- 239000010905 bagasse Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- -1 oxygen radical Chemical class 0.000 description 5
- 239000000123 paper Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 230000003165 hydrotropic effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000003999 cyclitols Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005360 mashing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 235000018553 tannin Nutrition 0.000 description 1
- 229920001864 tannin Polymers 0.000 description 1
- 239000001648 tannin Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
- D21C3/026—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of O2, e.g. air
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/222—Use of compounds accelerating the pulping processes
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention discloses a kind of methods that collaboration processing improves oxygen alkali pulping effect, belong to pulp and paper technology field；This method pre-processes raw material using 30 DEG C of -60 DEG C of hot water, boiling vessel is sent into after screw extrusion by compression ratio 1:1.5-1:4 later, add free radical controlling agent during the cooking process to improve oxygen alkali pulping effect, it is compared with traditional oxygen alkali pulping method, the synergistic effect of hot-water pretreatment, screw extrusion conveying and free radical controlling agent can make oxygen alkali pulping screened yield improve 4%-7%, Kappa number reduces 2.1-3.4, and whiteness improves 4%ISO to 6%ISO.
Description
Technical field
The present invention relates to a kind of method that collaboration processing improves oxygen alkali pulping effect, the raw material after hot-water pretreatment passes through spiral shell
Rotation, which squeezes to convey into boiling vessel, carries out oxygen alkali pulping, and adds free radical controlling agent during oxygen alkali pulping to obtain high obtain
Rate, high whiteness and high performance paper pulp, belong to pulping and paper-making field.
Background technique
China is a pulping and paper-making big country, and the consumption figure early in China's paper in 1998 and cardboard has reached the first in the world.But
The lack of checks on power of paper grade (stock) wood raw material the development of China's pulp and paper industry, therefore using non-wood fibrous raw material slurrying can
Using the important supplement as pulping wood.The traditional pulping process of non-wood material, such as soda processes, sulfate process have slurry
The disadvantages of yield is low, and black liquor is difficult.Oxygen alkali pulping is as a kind of environment amenable pulping process, and whiteness is high, black liquor difficulty
Low advantage, non-wood material are a kind of methods more efficiently, environmentally friendly using oxygen alkali pulping.
But oxygen alkali pulping process is gas-liquid-solid phase reaction, and participates in the free radical of delignification reaction there are the times
It is short, it is higher to medicinal liquid osmosis requirement, it is more suitable for the of a relatively loose non-wood fibrous raw material of structure.Meanwhile oxygen alkali pulping process
The problems such as that there is delignification selectivities is poor for the oxygen radical of the high oxidation potential of middle generation, causes screened yield lower.
Free radical controlling agent can promote the production of free radical in cooking liquor in digestion process as a kind of digesting assistant
It is raw；The lower free radical of the redox potentials such as ultra-oxygen anion free radical, can react with lignin, promote the de- of lignin
Out, while to carbohydrate it has little effect；The oxygen radicals such as the higher hydroxyl radical free radical of redox potential are to wood
Degradation is generated to carbohydrate while element removing.Being added with for free radical controlling agent mutually turns conducive to free radical
Change, such as: the addition of anthraquinone-2-sodium promotes the generation of ultra-oxygen anion free radical, inhibits the oxidations such as hydroxyl radical free radical also
The generation of the former higher oxygen radical of potential, reduces the degradation of carbohydrate to a certain extent.But oxygen alkali pulping
Raw material, lignin content is higher, if the addition of free radical controlling agent is improper, will lead to carbohydrate degradation seriously or is difficult into
Slurry.
Addition carbohydrate protective agent is usually added in the slurrying of oxygen system and bleaching process.On the one hand, protective agent can be adjusted
Save the pH value and reaction reagent stability of reaction system；On the other hand it can react, inhibit with carbohydrate reducing end group
The degradation of carbohydrate；This can guarantee in free radical treatment process that carbohydrate is controlled better, and controllability mentions
Height, control difficulty decline.
By carrying out hot-water pretreatment, the hydrotropic lignin small molecule contained in raw material, hot water extract's (polysaccharide to raw material
Substance, cyclitol, tannin, pigment etc.) it is dissolved out with hot-water pretreatment.Non-fibrous material can be separated by screw extrusion
It goes out, meanwhile, by feedstock transportation to digester after helical compression, the variation of volume expands fibrous raw material, and the hole of fiber relaxes
Expansion, the infiltration and subsequent cooking liquor for being conducive to medical fluid, which reach, improves the accessibility of lignin, more accurately occurs with lignin anti-
It answers, improves the selectivity of delignification.
Therefore, by improving the accurate accessibility of raw material porosity and medical fluid, in conjunction with free radical control and carbohydrate
Protection can protect carbohydrate to greatest extent, improve effects on slurry making, obtain high yield pulp1, high whiteness paper pulp, while can also mention
High physical property of pulp.
Summary of the invention
The purpose of the present invention is to provide a kind of methods that collaboration processing improves oxygen alkali pulping effect, squeeze by using spiral
The mode of pressure conveys raw material and addition free radical controlling agent collaboration after hot-water pretreatment and improves oxygen alkali pulping effect, which is
It is achieved through the following technical solutions:
(1) raw material is mixed with 30 DEG C -60 DEG C of hot water in the ratio that solid-to-liquid ratio g:mL is 1:4-1:10, raw material is pressed after mixing
The ratio of compression ratio 1:1.5-1:4 conveys into boiling vessel after screw extrusion is handled and carries out boiling, cooking schedule are as follows: slurry is dense
7.5%-15.0%(mass ratio), NaOH additive amount is the 20.0%-35.1% of over dry material quality, and protective agent additive amount is that over dry is former
Expect that the 0.1%-4.0% of quality, free radical controlling agent additive amount are the 0.05%-1.50% of over dry material quality, is filled with oxygen to oxygen
0.4MPa-0.8MPa is pressed, then 80 DEG C -120 DEG C is warming up in 50min-70min and keeps the temperature 90min-200min；
(2)) after boiling, cooking waste liquor enters alkali collection, and gained slurry carries out screening the pulp with screen slot pulp screen, after washing
The good slurry of oxonium base is obtained, the good slurry of gained oxonium base can be directly used for bleaching or direct beating and papermaking, is mixed into after slurry recycling to slurrying original
Material is re-fed into boiling vessel.
The protective agent is MgSO4Or MgSO4And Na2SiO3Mixture, MgSO4And Na2SiO3Mass ratio be 1:
0.1-1:7。
The free radical controlling agent anthraquinone-2-sodium, vitamin C, vitamin E, mannitol, polysaccharide, before boiling
Or it is warming up to 80 DEG C -120 DEG C and is added before keeping the temperature 60min；Polysaccharide is that polysaccharides, astragalus polyose or Fructus Schisandrae Polysaccharide etc. are planted
Object extract.
The raw material is the non-wood fibrous raw materials such as bagasse, straw, wheat straw or Chinese alpine rush.
Compared with prior art, present invention is characterized in that
(1) oxygen alkali pulping is a kind of environmental-friendly pulping process, using domestic sufficient non-wood-fiber resource system
Slurry, gained oxonium base starch screened yield height, can reach higher whiteness without bleaching, paper properties are more excellent, are a kind of rings
The pulping process of guarantor；
(2) in such a way that hot-water pretreatment and screw extrusion conveying combine, it is small to greatly reduce hydrotropic lignin in raw material
Molecule, water extract content, improve raw material porosity and specific surface area, increase the penetrating power of medical fluid, make alkali and generation
Free radical it is more accurate, faster react with lignin；
(3) free radical controlling agent is added in the cooking and heat-preservation stage, adjusts the generation of free radical in reaction process, removing can be improved
The selectivity of lignin；
(4) the protectant addition of carbohydrate can make up delignification caused by free radical control during oxygen alkali pulping and imitate
The contradiction of rate and delignification selectivity, the inhibition and delignification efficiency for so that oxygen alkali pulping carbohydrate is degraded are improved simultaneously；
(5) it is compared with tradition oxygen alkali pulping method, hot-water pretreatment, screw extrusion convey and the synergistic effect of free radical controlling agent
Oxygen alkali pulping screened yield can be made to improve 4%-7%, Kappa number reduces 2.1-3.4, and whiteness improves 4%ISO to 6%ISO.
Specific embodiment
The present invention will be further explained with reference to the examples below, but protection scope of the present invention is not limited to the model
It encloses.
Embodiment 1
In terms of over dry, according to the ratio of solid-to-liquid ratio g:mL 1:10, bagasse is uniformly mixed with 60 DEG C of hot water, later according to compression
Ratio than 1:4, raw material conveys into boiling vessel through screw extrusion and carries out boiling after mixing, starches dense 11.5%(mass ratio), NaOH adds
Dosage is the 20% of over dry material quality, protective agent (MgSO4And Na2SiO3Mixture) additive amount is over dry material quality
2.1%, wherein MgSO4With Na2SiO3Mass ratio be 1:4, be passed through oxygen to oxygen press 0.8 MPa, then 50min is warming up to 80 DEG C
And keep the temperature 200min, wherein the anthraquinone-2-sodium of over dry material quality 0.05% is added in digester after heating；It steams
After boiling, cooking waste liquor enters alkali collection, and gained slurry carries out screening the pulp with screen slot pulp screen, and it is good to obtain oxonium base after washing
Slurry, the good slurry of gained oxonium base can be directly used for bleaching or direct beating and papermaking, be mixed into after slurry recycling and be re-fed into pulping raw material
Boiling vessel；The good slurry quality of gained oxonium base are as follows: screened yield 54.84%-55.28%, Kappa number 8.8-9.5, whiteness 63.7%ISO-
64.5%ISO。
Embodiment 2
In terms of over dry, according to the ratio of solid-to-liquid ratio g:mL 1:7, bagasse is uniformly mixed with 45 DEG C of hot water, later according to compression ratio
The ratio of 1:2.5, raw material conveys into boiling vessel through screw extrusion and carries out boiling after mixing, starches dense 12%(mass ratio), NaOH addition
Amount is the 23% of over dry material quality, protective agent (MgSO4And Na2SiO3Mixture) additive amount is over dry material quality
1.0%, wherein MgSO4With Na2SiO3Mass ratio be 1:7, be passed through oxygen to oxygen press 0.6 MPa, then 60min is warming up to 105
DEG C and keep the temperature 170min, wherein digester is added in the vitamin C of over dry material quality 0.25% by 40 min after heating
In；After boiling, cooking waste liquor enters alkali collection, and gained slurry carries out screening the pulp with screen slot pulp screen, obtains after washing
The good slurry of oxonium base, the good slurry of gained oxonium base can be directly used for bleaching or direct beating and papermaking, be mixed into after slurry recycling to pulping raw material weight
It is new to be sent into boiling vessel；The good slurry quality of gained oxonium base are as follows: screened yield 63.52%-63.56%, Kappa number 10.4-10.6, whiteness
60.4%ISO-62.4%ISO。
Embodiment 3
In terms of over dry, according to the ratio of solid-to-liquid ratio g:mL 1:4, bagasse is uniformly mixed with 30 DEG C of hot water, later according to compression ratio
The ratio of 1:1.5, raw material conveys into boiling vessel through screw extrusion and carries out boiling after mixing, starches dense 7.5%(mass ratio), NaOH adds
Dosage is the 28% of over dry material quality, protective agent (MgSO4And Na2SiO3Mixture) additive amount is over dry material quality
4.0%, vitamin E additive amount is the 0.5% of over dry material quality, wherein MgSO4With Na2SiO3Mass ratio be 1:6, be passed through oxygen
Gas to oxygen presses 0.4MPa, and then 70min is warming up to 120 DEG C and keeps the temperature 90min, and after boiling, cooking waste liquor enters alkali collection,
Gained slurry carries out screening the pulp with screen slot pulp screen, obtains the good slurry of oxonium base after washing, and the good slurry of gained oxonium base can be directly used for floating
White or direct beating and papermaking is mixed into after slurry recycling and is re-fed into boiling vessel to pulping raw material；The good slurry quality of gained oxonium base are as follows: thin
Pulp yield 59.23%-59.94%, Kappa number 11.5-12.4, whiteness 53.2%ISO-54.8%ISO.
Embodiment 4
In terms of over dry, according to the ratio of solid-to-liquid ratio g:mL 1:6, bagasse is uniformly mixed with 50 DEG C of hot water, later according to compression ratio
The ratio of 1:3, raw material conveys into boiling vessel through screw extrusion and carries out boiling after mixing, starches dense 10%(mass ratio), NaOH additive amount
It is the 25% of over dry material quality, protective agent (MgSO4) additive amount be over dry material quality 3.0%, be passed through oxygen to oxygen pressure
0.5MPa, then 60min is warming up to 100 DEG C and keeps the temperature 180min, wherein 55min is by over dry material quality after heating
1.5% anthraquinone-2-sodium is added in digester；After boiling, cooking waste liquor enters alkali collection, gained slurry screen slot
Pulp screen carries out screening the pulp, obtains the good slurry of oxonium base after washing, the good slurry of gained oxonium base can be directly used for bleaching or directly mashing is copied
Paper is mixed into after slurry recycling and is re-fed into boiling vessel to pulping raw material；The good slurry quality of gained oxonium base are as follows: screened yield 58.58%-
60.52%, Kappa number 10.8-11.9, whiteness 61.2%ISO-62.6%ISO.
Embodiment 5
In terms of over dry, according to the ratio of solid-to-liquid ratio g:mL 1:5, straw is uniformly mixed with 40 DEG C of hot water, later according to compression ratio
The ratio of 1:4, raw material conveys into boiling vessel through screw extrusion and carries out boiling after mixing, starches dense 13%(mass ratio), NaOH additive amount
It is the 35.1% of over dry material quality, protective agent (MgSO4) additive amount be over dry material quality 0.1%, be passed through oxygen to oxygen pressure
0.5 MPa, then 50min is warming up to 90 DEG C and keeps the temperature 160min, wherein by over dry material quality 0.05% after heating
Mannitol is added in digester；After boiling, cooking waste liquor enters alkali collection, and gained slurry is sieved with screen slot pulp screen
Slurry obtains the good slurry of oxonium base after washing, and the good slurry of gained oxonium base can be directly used for bleaching or direct beating and papermaking, after slurry recycling
It is mixed into and is re-fed into boiling vessel to pulping raw material；The good slurry quality of gained oxonium base are as follows: screened yield 52.83%-54.05%, Kappa number
11.8-12.9, whiteness 53.2%ISO-54.6%ISO.
Embodiment 6
In terms of over dry, according to the ratio of solid-to-liquid ratio g:mL 1:8, wheat straw is uniformly mixed with 60 DEG C of hot water, later according to compression ratio
The ratio of 1:2, raw material conveys into boiling vessel through screw extrusion and carries out boiling after mixing, starches dense 15%(mass ratio), NaOH additive amount
It is the 30% of over dry material quality, protective agent (MgSO4And Na2SiO3Mixture) additive amount be over dry material quality 2.0%,
Wherein MgSO4With Na2SiO3Mass ratio be 1:1, be passed through oxygen to oxygen press 0.7MPa, then 50min is warming up to 90 DEG C and keeps the temperature
200min, wherein the polysaccharides of over dry material quality 0.1% is added in digester after heating；After boiling,
Cooking waste liquor enters alkali collection, and gained slurry carries out screening the pulp with screen slot pulp screen, obtains the good slurry of oxonium base, gained oxygen after washing
The good slurry of alkali can be directly used for bleaching or direct beating and papermaking, is mixed into after slurry recycling and is re-fed into boiling vessel to pulping raw material；Institute
Obtain the good slurry quality of oxonium base are as follows: screened yield 54.75%-55.25%, Kappa number 12.1-12.9, whiteness 52.1%ISO-53.4%ISO.
Claims (5)
1. a kind of method that collaboration processing improves oxygen alkali pulping effect, it is characterised in that: by over dry raw material and hot water solid-to-liquid ratio g:
ML is that the ratio of 1:4-1:10 mixes raw material with 30 DEG C -60 DEG C of hot water, and raw material is by compression ratio 1:1.5-1:4's after mixing
Ratio conveys into boiling vessel after screw extrusion is handled and carries out boiling, cooking schedule are as follows: starch dense 7.5%-15.0%, NaOH adds
Dosage is the 20.0%-35.1% of over dry material quality, and protective agent additive amount is the 0.1%-4.0% of over dry material quality, free radical
Controlling agent additive amount is the 0.05%-1.50% of over dry material quality, is filled with oxygen to oxygen and presses 0.4MPa-0.8MPa, then
50min-70min is warming up to 80 DEG C -120 DEG C and keeps the temperature 90min-200min；After boiling, cooking waste liquor enters alkali collection,
Gained slurry carries out screening the pulp with screen slot pulp screen, obtains the good slurry of oxonium base after washing, and the good slurry of gained oxonium base can be directly used for floating
White or direct beating and papermaking is mixed into after slurry recycling and is re-fed into boiling vessel to pulping raw material.
2. the method that collaboration processing according to claim 1 improves oxygen alkali pulping effect, it is characterised in that: protective agent is
MgSO4Or MgSO4And Na2SiO3Mixture, MgSO4And Na2SiO3Mass ratio be 1:0.1-1:7.
3. the method that collaboration processing according to claim 1 improves oxygen alkali pulping effect, it is characterised in that: free radical control
Agent anthraquinone-2-sodium, vitamin C, vitamin E, mannitol, polysaccharide before boiling or are warming up to 80 DEG C -120 DEG C and protect
It is added before warm 60min.
4. the method that collaboration processing according to claim 3 improves oxygen alkali pulping effect, it is characterised in that: polysaccharide is Chinese holly
Qi polysaccharide, astragalus polyose or Fructus Schisandrae Polysaccharide.
5. the method that collaboration processing according to claim 1 improves oxygen alkali pulping effect, it is characterised in that: raw material is sugarcane
Slag, straw, wheat straw or Chinese alpine rush.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810735609.1A CN109024032A (en) | 2018-07-06 | 2018-07-06 | A method of collaboration processing improves oxygen alkali pulping effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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