CN106012627A - Method for preparing high-brightness bleached mechanical pulp of bamboo by utilizing alcohol solvent - Google Patents
Method for preparing high-brightness bleached mechanical pulp of bamboo by utilizing alcohol solvent Download PDFInfo
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- CN106012627A CN106012627A CN201610348522.XA CN201610348522A CN106012627A CN 106012627 A CN106012627 A CN 106012627A CN 201610348522 A CN201610348522 A CN 201610348522A CN 106012627 A CN106012627 A CN 106012627A
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- carrying
- bamboo
- hydrogen peroxide
- alcohol solvent
- pulp
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/023—Cleaning wood chips or other raw materials
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
-
- 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
-
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1026—Other features in bleaching processes
- D21C9/1052—Controlling the process
-
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
Abstract
The invention discloses a method for preparing a high-brightness bleached mechanical pulp of bamboo by utilizing an alcohol solvent. The method comprises the following steps: (1) washing a bamboo raw material with hot water, and carrying out extruding dewatering; (2) carrying out pre-steaming; (3) carrying out screw extrusion; (4) carrying out chemical impregnation; (5) carrying out pulping with high concentration at high pressure; (6) carrying out bleaching hydrogen peroxide of a highly-concentrated alkaline alcohol solvent phase; and (7) carrying out latency elimination, washing and screening so as to prepare the pulp. Compared with a conventional water-phase bleaching process, an alkaline alcohol solvent phase bleaching process provided by the invention can prepare a high-brightness pulp with a brightness higher than 76% ISO; meanwhile, the alcohol solvent can be distilled and recycled, so the process can greatly reduce the usage amount of water in the stage of bleaching of pulp preparation; and since a medium is the alcohol solvent, a discharged waste liquid has good combustibility and combustion heat value and can be directly delivered into a boiler for combustion, so emission of COD in the beaching stage of pulp preparation is greatly reduced, and no harmful gas is discharged at the same time.
Description
Technical field
The present invention relates to pulping technique by chemical-mechanical method field, utilize alcohols solvent to prepare bamboo more particularly to one
The method of material High brightenss bleach reducing rules.
Background technology
China's bamboo resource is the abundantest, and bamboo grove area reaches 4,200,000 hectares, accounts for 1/4th of world's cultivated area.
Bamboo fiber cellulose content is high, and intensity is good, is excellent paper making raw material.Bamboo wood non-bleached high yield pulp strength character
Excellent, it is possible to meet the needs of manufacturing paper with pulp of true qualities paper product.It is excellent that soda processes and Arbiso process can produce capability and performance
Good bamboo wood non-bleached high yield pulp, joins and is ferreted out performance indications and is fully achieved kraft liner cardboard paper technical specification
(GB13024-91) board product of the above standard of B level.
But owing to bamboo wood component structure is special, chromophoric group chemical constituent structure is special, source complexity.Crowd
In many conventional natural paper making raw materials, the p-hydroxyphenyl relative amount of bamboo wood lignin structure is the highest, contains knot simultaneously
The Syringa oblata Lindl. base phenylpropyl alcohol alkyl structure unit that structure is stable.Document (Chengrong Qin etc, 2011,16th
International symposium on wood, fiber and pulping chemistry.vol.1) research point out,
Original whiteness is up to the bamboo chemimechanical pulp (APMP) of 55.6%ISO through single hop hydrogen peroxide, peracetic acid drift
Bai Hou, is only capable of reaching 69.9%ISO and 70.9%ISO whiteness.Patent (ZL200910184496.1) group
Close three sections (H2O2 activation, high density bleaching, desolventing technology) bleaching bamboo chemimechanical pulp whiteness at 71%ISO extremely
Between 73%ISO. the research of document (T.K Roy, 1985, ISWPC, Vancouver, BC, 43-47) also indicates that
Bamboo chemimechanical pulp good strength, but bleachability is poor, uses oxidized form (hydrogen peroxide) bleaching meeting in bamboo pulp
Produce secondary carbonyl structure so that whiteness cannot improve；Use reduced form (sodium dithionite) bleaching, right
Quinoid and the carbonyl structure effect of condensation are the least.Multiple studies have shown that in recent years, it is considered to the routine of economic factor
Aqueous alkaline hydrogen peroxide bleaching technique (hydrogen peroxide use is less than 8%), bamboo chemimechanical pulp can only be bleached
To 62%ISO.Hydrogen peroxide use is improved to 12%, even if bleach residue also has a large amount of hydrogen peroxide residues,
Pulp brightness also cannot be more than 68%ISO.(grinding of Liang Fangmin, cizu reducing rules Technology and bleaching mechanism
Study carefully [D], 2011)
In sum, even if in the case of not considering economic feasibility, the various bleaching handss of tradition aqueous media
Duan Wufa prepares the whiteness bamboo chemimechanical pulp slurry more than 73%ISO.Bamboo chemimechanical pulp physical strength index is excellent,
But it is the most up to standard to be limited by optical property, it is impossible to be applied to the high-grade sheet paper products of high whiteness demand.
Summary of the invention
In order to solve the technical barrier of bamboo chemimechanical pulp difficulty bleaching, the invention provides a kind of bamboo chemimechanical pulp Gao Bai
The method of degree bleaching, can obtain the whiteness high whiteness bamboo chemimechanical pulp more than 76%ISO.
For realizing above-mentioned technical purpose, the alcohols solvent that utilizes that the present invention proposes prepares bamboo wood High brightenss bleach machine
The method of slurry comprises the following steps:
(1) preparation of raw material: first bamboo material is carried out hot wash, then carries out extrusion dehydration；
(2) presteaming；
(3) screw extrusion: step (2) is processed and obtains by the double-screw extrusion machine using compression ratio to be 1: 4
Material carries out extrusion dehydration, it is preferable that after extruding, material mass dryness fraction is 30%-50%；
(4) chemical impregnation: with sodium sulfite medicinal liquid, step (3) is processed the material obtained and carry out chemical treatment,
Treatment conditions are；
(5) highly concentrated atmospheric refining runs: the material after processing step (4) with highly concentrated mill carries out highly concentrated normal pressure mill
Slurry；
(6) highly concentrated alkaline alcohol kind solvent phase hydrogen peroxide bleaching: with alkaline hydrogen peroxide alcohols solvent phase medicinal liquid
Step (5) being processed the material obtained and carries out chemical treatment several times, each treatment conditions are: hydrogen peroxide
Consumption is the 2～8% of over dry quality of material, and sodium hydroxide concentration is the 1～10% of over dry quality of material, metal
Ion chelating agent consumption is the 0.1～0.3% of absolute dry mass, and stabilizer of hydrogen peroxide is over dry quality of material
0.1～1.0%, impregnation concentrations is 5～35%, dipping temperature 40～100 DEG C, dip time 15～60 minutes, often
After secondary process, material is through being washed to filtrate clear；
(7) reach after step (6) repeatedly processes the slurry of target whiteness disappear latent, wash, screen, finally
Pulping.
Specifically, in step (2), the condition of presteaming is: exist the material of the process that step (1) obtains
1 atmospheric pressure, carry out presteaming 10～30 minutes at 100～105 DEG C.
In step (2), the condition of chemical impregnation is: sodium sulfite consumption is the 1～4% of over dry quality of material,
Sodium hydroxide concentration is the 0～4% of over dry quality of material, and metal ion chelation agent consumption is absolute dry mass
0.1～0.3%, impregnation concentrations is 30～40% (after i.e. adding above-mentioned chemical agent, to be supplemented to this with the water of surplus
Concentration), dipping temperature 40～150 DEG C, dip time 15～60 minutes.
Described metal ion chelation agent is diethylene triamine pentacetic acid (DTPA) five sodium.
In step (5), highly concentrated atmospheric refining runs, refining concentration is 25～35%.
In step (6), described alcohols solvent be methanol, ethanol, ethylene glycol, 1-propanol, 2-propanol,
Any one or a few mixture in propylene glycol and glycerol.
Stabilizer of hydrogen peroxide is sodium silicate or organic phosphonate, and described organic phosphonate includes and is not limited to 1
-hydroxy ethylidene i.e. the HEDPA of-1.1-di 2 ethylhexyl phosphonic acid, 1-hydroxy ethylidene-1,1-diphosphonic acid i.e. HEDP, the adjacent phenyl second of ethylenediamine two
Acid i.e. EDDHA, diethylenetriamine penta i.e. DETPMP.
In step (6), with alkaline hydrogen peroxide alcohols solvent phase medicinal liquid, step (5) is processed the material obtained
Carry out 1-8 chemical treatment.
Beneficial effect: compared with prior art, present invention have the advantage that
(1) present invention uses alcohols solvent alkaline hydrogen peroxide bleaching technique, utilizes alcohol under strong basicity environment to divide
The strong nucleation of the alkoxyl that son ionization produces, helps the obstinate chromophore in hydrogen peroxide attack bamboo material
Group, is oxidized the small-molecule substance being decomposed into solubility, and postmenstruation, washing separated from slurry, effectively dropped
The low bleaching difficulty of bamboo chemimechanical pulp, improves pulp brightness.
(2) compared with existing aqueous phase bleaching process, the technological process of this method is simple, the recyclable circulation of solvent
Utilizing, be effectively increased the whiteness of bamboo chemimechanical pulp, the alkaline alcohol kind solvent phase bleaching process that the present invention uses can
The high whiteness slurrying more than 76%ISO of the preparation whiteness, and owing to alcohols solvent can be with Distillation recovery, this technique
The water consumption of pulping bleaching section can be greatly reduced, and the waste liquid of discharge is alcohols solvent due to medium, has good
Combustibility and combustion heat value, can directly send boiler combustion, be greatly reduced pulping bleaching section COD row
Put, discharge without harmful gas simultaneously, be simultaneously achieved the bamboo material higher value application in high-grade paper product field.
Detailed description of the invention
The present invention is described in detail below by specific embodiment.
Embodiment 1:
First bamboo chip washs through hot water (temperature is 60-70 DEG C), removes the heavy seeds such as silt, the bamboo after washing
Sheet carries out normal pressure decatize in 100～105 DEG C of steam, and steaming time is 15min, pair spiral shells of the material after decatize
Rotation extruder extrudes under the compression ratio of 1: 4 and is concentrated into 50% concentrations above, removes the water in raw material as much as possible
Dissolubility extract, is subsequently adding sodium sulfite medicinal liquid and carries out chemical impregnation, and immersion condition is: sodium sulfite consumption
2.0% (to over dry material), DTPA (diethylene triamine pentacetic acid (DTPA) five sodium) consumption 0.2% (to over dry material),
Dipping starches dense (over dry material heavily accounts for wet stock gross weight) 35%, dipping temperature 135 DEG C, dip time 10 minutes；
Material after dipping is sent into highly concentrated mill and is carried out highly concentrated atmospheric refining runs, and pulping freedom controls about 350ml.Will
Mill disposed slurry carries out alkaline hydrogen peroxide ethanol and bleaches mutually, and bleaching section chemicals addition is: hydrogen peroxide use
3.0% (to over dry material), sodium hydroxide concentration 3.0% (to over dry material), DTPA (diethylenetriamine
Pentaacetic acid five sodium) consumption 0.5% (to over dry material), amount of sodium silicate 1.5% (to over dry material), molten
Agent is ethanol, bleaching levels be 10% (to over dry material) reaction temperature be 90 DEG C, at closed pressure resistant container
Middle reaction 120 minutes.After completing once to bleach with deionized water by slurry washing to filtrate clear.Then
Continue to carry out three bleachings again by above-mentioned bleaching section medicine addition and reaction condition, after bleaching, slurry is washed every time
Wash to filtrate clear.Complete the slurry after four bleachings altogether disappear latent, wash, screen, finally become
Slurry.Pulp quality: whiteness 76.5%ISO, the bulk of paper pulp is 1.9cm3/ g, tensile strength 31.46N.m/g.
And using the aqueous phase bleaching process gained slurrying whiteness under the conditions of same medicine is 68%ISO, bulk is
1.91cm3/ g, tensile strength 30.28N.m/g.
Embodiment 2
First bamboo chip washs through hot water (temperature is 60-70 DEG C), removes the heavy seeds such as silt, the bamboo after washing
Sheet carries out normal pressure decatize in 100～105 DEG C of steam, and steaming time is 15min, pair spiral shells of the material after decatize
Rotation extruder extrudes under the compression ratio of 1: 4 and is concentrated into 50% concentrations above, removes the water in raw material as much as possible
Dissolubility extract, is subsequently adding sodium sulfite medicinal liquid and carries out chemical impregnation, and immersion condition is: sodium sulfite consumption
2.0% (to over dry material), sodium hydroxide concentration 2.0%, DTPA consumption 0.2% (to over dry material),
Dipping starches dense (over dry material heavily accounts for wet stock gross weight) 35%, dipping temperature 135 DEG C, dip time 10 minutes；
Material after dipping is sent into highly concentrated mill and is carried out highly concentrated atmospheric refining runs, and pulping freedom controls about 350ml.Point
Mill disposed slurry does not carry out alkaline hydrogen peroxide aqueous phase, ethylene glycol phase, ethanol phase, and normal propyl alcohol is bleached mutually, bleaches
Section chemicals addition is: hydrogen peroxide use 9% (to over dry material), sodium hydroxide concentration 10.0% is (right
Over dry material), DTPA consumption 0.5% (to over dry material), mix organic phosphate stabilizer (30%HEDP,
40%EDDHA, 30%DEIPMP) consumption 0.5% (to over dry material), bleaching levels is 10% (right
Over dry material) reaction temperature is 90 DEG C, stops reaction 120 minutes in hermetic container.After bleaching
Slurry disappear latent, wash, screen, last pulping.Pulp brightness is: aqueous phase system 66.4%ISO, ethylene glycol
Phase whiteness 73.6%ISO ethanol phase whiteness 76.4%ISO, propanol phase whiteness 76.8%ISO.
Claims (9)
1. one kind utilizes the method that alcohols solvent prepares bamboo wood High brightenss bleach reducing rules, it is characterised in that bag
Include following steps:
(1) preparation of raw material: first bamboo material is carried out hot wash, then carries out extrusion dehydration；
(2) presteaming；
(3) screw extrusion: step (2) is processed and obtains by the double-screw extrusion machine using compression ratio to be 1: 4
Material carries out extrusion dehydration；
(4) chemical impregnation: with sodium sulfite medicinal liquid, step (3) is processed the material obtained and carry out chemical treatment,
Treatment conditions are；
(5) highly concentrated atmospheric refining runs: the material after processing step (4) with highly concentrated mill carries out highly concentrated normal pressure mill
Slurry；
(6) highly concentrated alkaline alcohol kind solvent phase hydrogen peroxide bleaching: with alkaline hydrogen peroxide alcohols solvent phase medicinal liquid
Step (5) being processed the material obtained and carries out chemical treatment several times, each treatment conditions are: hydrogen peroxide
Consumption is the 2～8% of over dry quality of material, and sodium hydroxide concentration is the 1～10% of over dry quality of material, metal
Ion chelating agent consumption is the 0.1～0.3% of absolute dry mass, and stabilizer of hydrogen peroxide is over dry quality of material
0.1～1.0%, impregnation concentrations is 5～35%, dipping temperature 40～100 DEG C, dip time 15～60 minutes, often
After secondary process, material is through being washed to filtrate clear；
(7) reach after step (6) repeatedly processes the slurry of target whiteness disappear latent, wash, screen, finally
Pulping.
Method the most according to claim 1, it is characterised in that in step (1), the bar of hot wash
Part is to wash under 40-100 degree Celsius, then carries out extrusion dehydration, and after extruding, material mass dryness fraction is 30%-50%.
Method the most according to claim 1, it is characterised in that in step (2), the condition of presteaming
For: to the material of the process that step (1) obtains at 1 atmospheric pressure, carry out presteaming 10～30 at 100～105 DEG C
Minute.
Method the most according to claim 1, it is characterised in that the condition of chemical impregnation in step (2)
For: sodium sulfite consumption is the 1～4% of over dry quality of material, sodium hydroxide concentration be over dry quality of material 0～
4%, metal ion chelation agent consumption is the 0.1～0.3% of absolute dry mass, and impregnation concentrations is 30～40%, dipping
Temperature 40～150 DEG C, dip time 15～60 minutes.
Method the most according to claim 4, it is characterised in that described metal ion chelation agent diethyl
Alkene Pentetate Pentasodium.
Method the most according to claim 1, it is characterised in that in step (5), highly concentrated atmospheric refining runs,
Refining concentration be 25～35%.
Method the most according to claim 1, it is characterised in that in step (6), described alcohols is molten
Agent be in methanol, ethanol, ethylene glycol, 1-propanol, 2-propanol, propylene glycol and glycerol any one or several
The mixture planted.
Method the most according to claim 1, it is characterised in that stabilizer of hydrogen peroxide be sodium silicate or
Organic phosphonate.
Method the most according to claim 1, it is characterised in that in step (6), with alkalescence peroxidating
Hydrogen alcohols solvent phase medicinal liquid processes, to step (5), the material obtained and carries out 1-8 chemical treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610348522.XA CN106012627B (en) | 2016-05-24 | 2016-05-24 | A kind of method that bamboo wood High brightenss bleach reducing rules are prepared using alcohols solvent |
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| CN201610348522.XA CN106012627B (en) | 2016-05-24 | 2016-05-24 | A kind of method that bamboo wood High brightenss bleach reducing rules are prepared using alcohols solvent |
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| CN106012627B CN106012627B (en) | 2018-05-04 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108149502A (en) * | 2017-12-23 | 2018-06-12 | 林荣铨 | A kind of bamboo fibre environment protecting paper and preparation method thereof |
| CN108193550A (en) * | 2017-12-23 | 2018-06-22 | 林荣铨 | A kind of graphene/bamboo fibre and preparation method thereof |
| CN108193541A (en) * | 2017-12-01 | 2018-06-22 | 广西金桂浆纸业有限公司 | A kind of preparation method of high whiteness reducing rules |
| CN108342923A (en) * | 2018-03-15 | 2018-07-31 | 中国制浆造纸研究院衢州分院 | A kind of preparation method of moso bamboo true qualities reducing rules |
| CN108642943A (en) * | 2018-04-03 | 2018-10-12 | 中国林业科学研究院林产化学工业研究所 | A method of preparing high-whiteness high-strength Eucalyptus chemi-mechanical pulp |
| CN109098026A (en) * | 2018-08-14 | 2018-12-28 | 中国林业科学研究院林产化学工业研究所 | A kind of method of reinforcing fiber raw material bleaching medicinal liquid osmosis |
| CN109534296A (en) * | 2019-01-14 | 2019-03-29 | 浙江金科双氧水有限公司 | A kind of anthraquinone oxidized residual liquid stabilizer for preparing hydrogen peroxide |
| CN113073488A (en) * | 2021-04-23 | 2021-07-06 | 华南理工大学 | Low-energy-consumption high-yield oxygen-barrier paper-based slurry pretreatment process |
| CN115992460A (en) * | 2023-01-18 | 2023-04-21 | 中国林业科学研究院林产化学工业研究所 | Closed condensation circulation bleaching reactor and efficient bleaching method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108193541A (en) * | 2017-12-01 | 2018-06-22 | 广西金桂浆纸业有限公司 | A kind of preparation method of high whiteness reducing rules |
| CN108193550A (en) * | 2017-12-23 | 2018-06-22 | 林荣铨 | A kind of graphene/bamboo fibre and preparation method thereof |
| CN108149502A (en) * | 2017-12-23 | 2018-06-12 | 林荣铨 | A kind of bamboo fibre environment protecting paper and preparation method thereof |
| CN108342923A (en) * | 2018-03-15 | 2018-07-31 | 中国制浆造纸研究院衢州分院 | A kind of preparation method of moso bamboo true qualities reducing rules |
| CN108642943B (en) * | 2018-04-03 | 2021-03-19 | 中国林业科学研究院林产化学工业研究所 | Method for preparing high-whiteness and high-strength eucalyptus chemi-mechanical pulp |
| CN108642943A (en) * | 2018-04-03 | 2018-10-12 | 中国林业科学研究院林产化学工业研究所 | A method of preparing high-whiteness high-strength Eucalyptus chemi-mechanical pulp |
| CN109098026A (en) * | 2018-08-14 | 2018-12-28 | 中国林业科学研究院林产化学工业研究所 | A kind of method of reinforcing fiber raw material bleaching medicinal liquid osmosis |
| CN109098026B (en) * | 2018-08-14 | 2021-01-26 | 中国林业科学研究院林产化学工业研究所 | Method for enhancing penetration of fiber raw material bleaching liquor |
| CN109534296A (en) * | 2019-01-14 | 2019-03-29 | 浙江金科双氧水有限公司 | A kind of anthraquinone oxidized residual liquid stabilizer for preparing hydrogen peroxide |
| CN113073488A (en) * | 2021-04-23 | 2021-07-06 | 华南理工大学 | Low-energy-consumption high-yield oxygen-barrier paper-based slurry pretreatment process |
| CN113073488B (en) * | 2021-04-23 | 2022-02-15 | 华南理工大学 | Low-energy-consumption high-yield oxygen-barrier paper-based slurry pretreatment process |
| CN115992460A (en) * | 2023-01-18 | 2023-04-21 | 中国林业科学研究院林产化学工业研究所 | Closed condensation circulation bleaching reactor and efficient bleaching method |
| CN115992460B (en) * | 2023-01-18 | 2024-01-30 | 中国林业科学研究院林产化学工业研究所 | Closed condensation circulation bleaching reactor and efficient bleaching method |
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