WO2000077294A1 - Lessive de cuisson pour pate a papier et procede de production de pate a papier - Google Patents

Lessive de cuisson pour pate a papier et procede de production de pate a papier Download PDF

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Publication number
WO2000077294A1
WO2000077294A1 PCT/JP2000/003834 JP0003834W WO0077294A1 WO 2000077294 A1 WO2000077294 A1 WO 2000077294A1 JP 0003834 W JP0003834 W JP 0003834W WO 0077294 A1 WO0077294 A1 WO 0077294A1
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WO
WIPO (PCT)
Prior art keywords
pulp
cooking liquor
cooking
liquor
polysulfide
Prior art date
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PCT/JP2000/003834
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English (en)
Japanese (ja)
Inventor
Tatsuya Andoh
Junji Tanaka
Toshihiko Sumino
Keigo Watanabe
Makoto Nakao
Original Assignee
Kawasaki Kasei Chemicals Ltd.
Nippon Paper Industries Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Kasei Chemicals Ltd., Nippon Paper Industries Co., Ltd. filed Critical Kawasaki Kasei Chemicals Ltd.
Priority to JP2001503731A priority Critical patent/JP4704638B2/ja
Priority to AU51097/00A priority patent/AU5109700A/en
Publication of WO2000077294A1 publication Critical patent/WO2000077294A1/fr

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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
    • 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

Definitions

  • the present invention relates to an effective pulp cooking liquor for cooking lignocellulosic materials and a method for producing pulp and pulp, and more particularly to a novel and useful pulp capable of improving pulp yield with a small amount of chemical solution
  • the present invention relates to a cooking liquor and a pulp manufacturing method using the pulp cooking liquor.
  • the main method for producing chemical pulp that has been industrially implemented so far is the alkaline cooking method of lignocellulosic materials for wood chips, of which alkaline cooking liquor is mainly composed of sodium hydroxide and sodium sulfide.
  • the craft method using is often used.
  • the quinone cooking method in which a quinone compound is present in such a kraft cooking method, is also widely known. According to the quinone cooking method, it is also known that, when compared with the same kappa monovalent value of pulp, the yield of pulp increases and the amount of cooking liquor used (chemical solution) decreases.
  • the quinone compound oxidizes and stabilizes the terminal aldehyde group of cellulose and hemicellulose in the wood chip, thereby suppressing the cell opening and the peeling reaction which is the hemicellulose dissolution reaction.
  • the quinone compound which has been reduced to a hydroquinone form by itself acts on lignin, reduces and elutes the lignin, and is itself oxidized to the quinone form.
  • the quinone compound stabilizes cellulose and hemicellulose through its own redox cycle and promotes delignification, thereby improving pulp yield when compared with the same kappa monovalent value of pulp. At the same time, it has the effect of reducing the amount of active alkali required for cooking.
  • polysulfide (polysulfide) digestion is widely known as a technique for improving pulp yield.
  • the polysulfide cooking method is a cooking method using a cooking liquor obtained by oxidizing white liquor used for kraft pulp cooking and partially converting sulfide ions in components into polysulfide ions. According to such a polysulfide digestion method, the terminal alcohol of cellulose and hemicellulose is used.
  • PS polysulfide
  • this cooking method produces the above-mentioned effects synergistically.
  • the PS-quinone cooking method improves the pulp yield at the same monovalent kappa and reduces the amount of active alkali used. Due to both effects, if the same amount of unbleached pulp is obtained, the amount of chemical solution used is small, so the load on the recovery boiler is reduced, and the power blister value is reduced, so that the load on the subsequent bleaching process is reduced. Has the effect.
  • pulp cooking liquor that can further improve the pulp yield and reduce the amount of chemical solution used without disrupting the chemical solution recovery balance in the pulp mill is desired. It is also desired to reduce the load on the recovery boiler.
  • pulp cooking liquor improvement such as pulp yield, differs depending on the type of wood chip used.
  • a chip selected from the scientific name: Fagus Crenata Blue as wood chip is selected and compared with the case of cooking with ordinary kraft pulp (KP).
  • KP ordinary kraft pulp
  • the pulp yield is increased by about 1% with respect to the absolutely dried chips compared with the same kappa monovalent pulp obtained, and the amount of cooking liquor (chemical solution) used There decreased about 1% relative to the bone-dry chip, as active alkali (N a 2 0 equivalent).
  • the pulp yield increases by about 16 with respect to the absolutely dry chips compared with the same kappa monovalent pulp obtained, but the cooking liquor used (chemical solution used) ) amount increases about 1% relative to the bone-dry chip, as active alkali (N a 2 0 equivalent).
  • the effects of each are said to appear synergistically.
  • the present invention provides a novel and useful pulp cooking liquor capable of improving the pulp yield with a small amount of added chemical solution and reducing the load on the recovery boiler, and a pulp manufacturing method using this pulp cooking liquor.
  • the purpose is to provide. Disclosure of the invention
  • the present invention relates to a digestion method for producing pulp having a kappa monovalent value of 10 to 45, in which the liquid ratio to absolutely dry chips is 1.5 to 5.0 LZ kg, and the maximum temperature is 140 to 180.
  • the wood chips scientific name: chips selected from Fagus C renata Blume
  • pulp of 8 When pulp of 8 is obtained, increase pulp yield by 3.5% or more and add Providing pulp cooking liquor, characterized in that the cooking liquor to reduce the rate more than 2%.
  • This invention is hereinafter referred to as a first invention.
  • the present invention relates to a white liquor or a green liquor containing at least polysulfide ions, wherein the concentration of sulfur sulfide constituting polysulfide ions is 6 gZL or more, and 0.01 to 1.
  • This invention is hereinafter referred to as a second invention.
  • the pulp cooking liquor of the present invention when pulp obtained by cooking is compared with the same kappa monovalent value, the effect of improving the yield and the effect of reducing the amount of active alkali used are achieved. Therefore recovery The load on the boiler can be reduced, and the cooking time can be reduced.
  • the present invention is applicable to all current pulp digestion systems.
  • the liquid ratio to the absolutely dry chip is 1.5 to 5.OLZkg
  • the maximum temperature is 140 to It is a pulp cooking liquor applicable to cooking methods in which the temperature is 180 ° C and the time required for the chips to reach the maximum temperature is 5 minutes or more. It is defined as a pulp cooking liquor having a predetermined effect when compared under certain cooking conditions.
  • the lignocellulosic material scientific name: F agus C renata B l um tip selected from e, N a OH: 70 g / L, N a 2 S: 3 0 g / L, N a 2 C 0 3: 1 5 g / L (N a 2 0 equivalent) as needed to evaporation solution liquid composition of distilled water was added, liquor ratio: 3. cooked under given conditions at 0 L / kg (bone dry per chip) Then, the temperature of the heating pulp file is such that the kappa monovalent value of the pulp becomes 18; for example, the temperature is raised from room temperature to 160 ° C in 60 minutes, and the temperature is raised to 160 ° C for 41 minutes.
  • Pulping is performed under conditions that are maintained.
  • a standard chip is a wood chip capable of obtaining pulp such that the pulp yield at that time is 50 to 51% based on the absolutely dry chip.And, using the same standard chip of the same material and the same shape, If necessary, add distilled water to make the same liquor ratio, raise the temperature with the same heating profile, and cook under the same conditions for the infiltration of the cooking liquor, for example, the same chip shape and size. Try to get 18 pulp.
  • cooking is performed by adjusting the amount of cooking liquor added. Increase the yield of the resulting pulp with a zipper value of 18 to 3.5% or more with respect to the absolutely dry chips and reduce the active alkali addition rate per absolutely dry chip by 2% or more with respect to the chip weight. Pulp cooking liquor.
  • the cooking liquor according to the present invention when a chip selected from the scientific name: Fagus C renata B 1 ume is selected as a wood chip, compared with a case where ordinary craft pulp (KP) cooking is performed, For the first time, an unprecedented large effect of improving pulp yield by 3.5% or more and a large effect of reducing chemical consumption by 2% or more as an active alkali addition rate are achieved.
  • the digester used for defining the pulp digestion liquid as described above is preferably a rotatable digester rather than a stationary cooker.
  • the pulp cooking liquor of the present invention preferably contains sodium hydroxide and sodium sulfide, and contains polysulfide ions.
  • polysulfide ion what is polysulfide ion?
  • Sulfur polysulfide refers to sulfur with an oxidation number of 0 in polysulfide ions and (X-1) sulfur in S. Further, N a
  • the 2 S state sulfur shall be the generic term for sulfide ions and sulfur (Sx 2 in one minute sulfur) of Ta ⁇ hydride ion during the oxidation number II.
  • the active alkali (hereinafter also referred to as "AA") is obtained by converting the N a OH + N a 2 S in N a 2 0 concentration.
  • the pulp cooking liquor of the first invention preferably contains polysulfide ion.
  • Examples of the method for producing the pulp cooking liquor containing polysulfide ions include an air oxidation method and an electrolytic method. .
  • the air oxidation method uses a solution containing sodium sulfide such as white liquor in the presence of an activated carbon catalyst. It comes into contact with air and oxidizes sulfide ions to produce polysulfide ions.
  • thiosulfate ion is inevitably produced as a by-product, and it is relatively difficult to increase the concentration of sulfur polysulfide constituting polysulfide ion. For this reason, in the present invention, it may be produced by an air oxidation method, but preferably, an electrolytic method is used.
  • the pulp cooking liquor of the first invention preferably contains a sulfur polysulfide concentration of 6 gZL or more.
  • a sulfur polysulfide concentration of 6 gZL or more.
  • the electrolysis method which is one of the methods for producing a pulp cooking liquor containing polysulfide ions, is particularly preferable as a method for producing a cooking liquor having a sulfur polysulfide concentration of 8 gZL or more.
  • Examples of such an electrolysis method include, for example, PCT No. JP 97/01456, Japanese Patent Application No. 10-16663 74, Japanese Patent Application No. 111-151016, developed by the present inventors. Japanese Patent Application 1 1 1 5 1 0 33 Electrolysis method such as No. 3 can be applied.
  • the electrolysis method when the reaction rate is increased to produce a high sulfur polysulfide concentration as in the air oxidation method, the selectivity is reduced, and a large amount of thiosulfate, which is ineffective for cooking, is not produced.
  • a solution containing sulfide ions for example, a white liquor or the like in an anode chamber of an electrolytic cell having an anode chamber provided with an anode, a cathode chamber provided with a cathode, and a diaphragm separating the two chambers.
  • a cooking liquor containing polysulfide ion can be obtained.
  • the anode must have alkali resistance and oxidation resistance.
  • nonmetals include carbon materials
  • metals include base metals such as nickel, cobalt, and titanium, and alloys and oxides thereof, or platinum, gold, and rhodium. And the like, and alloys and oxides thereof.
  • the structure of the anode is preferably a porous structure having a physically three-dimensional network structure.
  • an alkali-resistant material is preferable, and nickel, Raney nickel, nickel sulfide, steel, stainless steel, or the like can be used.
  • the shape is a flat plate or a mesh shape, and one or a plurality of them are used in a multilayer structure.
  • a three-dimensional electrode combining linear electrodes can also be used.
  • a cation exchange membrane As the membrane separating the anode compartment and the cathode compartment. Force cation exchange membranes guide cations from the anodic compartment to the cathodic compartment, but hinder the transfer of sulfide and polysulfide ions.
  • a cation exchange membrane a polymer membrane in which a cation exchange group such as a sulfonic acid group or a carboxylic acid group is introduced into a hydrocarbon-based or fluorine-based high molecule is preferable. If there is no problem in terms of alkali resistance or the like, a bipolar membrane, an anion exchange membrane, or the like can be used.
  • a part of the sulfide ion of the white liquor or the green liquor is oxidized to generate a polysulfide ion, which is supplied to the digestion step.
  • the pulp cooking liquor of the first invention if it contains polysulfide ions, it is preferable that N a 2 S state sulfur concentration remains 9 g ZL more than N a 2 0 conversion. If the concentration is less than 9 g / L, polysulfide ions become unstable, and the kappa monovalent of the pulp obtained by cooking may increase or the pulp yield may decrease.
  • the cooking liquor of the first invention preferably contains a quinone compound.
  • quinone compounds include 9,10-anthraquinone and 2-methyl-9,10-anthraquino Alkyl, anthraquinones such as 2,4-ethyl-9,10-anthraquinone, 1,4,4a, 9a-tetrahydro9,10-anthraquinone, 1,4-dihidro9,10-anthraquinone Quinone compounds such as, 2- (9,10-anthraquinol) -11-ethanesulfonic acid, 9,10-anthraquinone-2-sulfonic acid, amino-9,10-anthraquinone, and their reduced forms ( A dihydro form or a sodium salt of a dihydro form).
  • the addition to the state in reduced form in quinone body Ru oxidized der It can be either a hydroquinone body.
  • the state after addition may be either.
  • 1,4,4a, 9a-tetrahydro-9,10-anthraquinone is converted to 1,4-dihydro-19,10-dihydroxy-thracenedinatridium salt in an alkaline cooking liquor. ing.
  • the quinone compound preferably contained in the pulp cooking liquor of the first invention is preferably present in the cooking liquor such that the quinone compound is contained in an amount of 0.01 to 1.5% by weight per absolutely dried chip. More preferably rather is 0.02 to 0.06 weight 0/0. If abundance 0.0 less than 1 wt 0/0 per bone dry chips quinone compound is not Kappa monovalent or AA usage digestion after pulp abundance is too small can be reduced, the force wrapper value and AA The relationship between the addition rate and the pulp yield is not improved.
  • the pulp cooking liquor of the second invention is a white liquor or a green liquor containing at least polysulfide ions, wherein the concentration of sulfur sulfide constituting polysulfide ions is 6 gZL or more and 0.0 per absolutely dry chip.
  • 1 1. contains a quinone compound 5 weight 0/0.
  • the method for producing polysulfide ions contained in the cooking liquor may be an air oxidation method as in the case of the cooking liquor of the first invention, but the concentration of sulfur sulfide constituting the polysulfide ions may be reduced.
  • Cooking liquor above 6 g / L is preferably produced electrolytically. The electrolysis method can be performed as described above.
  • the sulfur polysulfide concentration is less than 6 g / L, the effect of improving pulp yield may be reduced. More preferably, it is 8 g / L or more.
  • the quinone compound is present in an amount of 0.01 to 1.5% by weight per absolutely dry chip. More preferably, it is 0.02 to 0.06% by weight. If the amount of the quinone compound is less than 0.01% by weight based on the absolutely dry chips, the amount of the quinone compound is too small to reduce the pulp power and AA consumption of the pulp after digestion. The relationship between additivity and pulp yield is not improved.
  • quinone compound even if the quinone compound is present in an amount exceeding 1.5% by weight, further reduction of pulp power and AA consumption after cooking and improvement of the relationship between pulp yield and pulp yield and AA consumption It is not allowed.
  • Specific examples and forms of the quinone compound are the same as those in the first invention.
  • N a 2 S state sulfur concentration remains N a 2 0 translated at 9 GZL above. If this concentration is less than 9 g / L, the polysulfide ions become unstable, and the pulp obtained by cooking may have a higher strength and the pulp yield may be reduced.
  • the method of adding the quinone compound may be any of a method of adding the compound at one time before or during the cooking or a method of adding the compound in steps.
  • the cooking liquor containing the quinone compound sufficiently penetrates into the chips.
  • the cooking liquor of the present invention is preferably used so that the liquor ratio when performing cooking using a batch digester is 2.0 to 5.0 LZkg per absolutely dry chip. More preferably, it is 2.5 to 4.0 LZkg. If the liquid ratio is less than 2.0 LZkg, the cooking liquor may not sufficiently penetrate into the chips, which may reduce the cooking effect, which is not preferable. When the liquid ratio exceeds 5.OLZkg, the effect of reducing the amount of used chemical liquid decreases, which is not preferable.
  • the liquid ratio is preferably adjusted to 1.5 to 5.0 L Zkg per absolutely dry chip. More preferably, it is 2.0 to 3.5 L / kg. If the liquid ratio is less than 1.5 L / kg, a gas phase is formed in the infiltration stage, and the digestion effect may be reduced, which is not preferable. If the liquid ratio exceeds 5.OL / kg, the effect of reducing the amount of chemical used decreases, which is not preferable. In addition, it is more preferable to use 1.5 to 3.5 L / kg when a softwood chip is used as a lignocellulosic material and 2.5 to 5.0 L / kg when a hardwood chip is used.
  • the cooking effect may be reduced due to insufficient penetration of the alkaline cooking liquor into the chips.
  • the liquor ratio refers to a bone-dry chip weight per liquid volume in the case of batch cooker force 5, in the continuous digester, Ze'inuichi-up flowing into the kettle per unit time It refers to the ratio between the weight and the volume of liquid flowing into the kettle.
  • the composition of white liquor usually used in pulp cooking is that white liquor used in current kraft pulp cooking usually contains 2 to 6 mol 1 ZL as alkali metal ions, of which 90% or more Is sodium ion, and the rest is almost force ion.
  • Anions are mainly composed of hydroxide ions, sulfide ions, and carbonate ions.
  • the sulfide ion concentration is usually 0.5 to 0.8 mo1 / L, and sulfate ions and thiosulfate ions are also included. , Including chloride ion and sulfite ion. It also contains trace components such as calcium, silicon, aluminum, phosphorus, magnesium, copper, manganese and iron.
  • the composition of green liquor is basically the same as white liquor. However, while white liquor is mainly composed of sodium sulfide and sodium hydroxide, green liquor is mainly composed of sodium sulfide and sodium carbonate.
  • a good cooking effect can be obtained with any of the lignocellulosic materials, coniferous or hardwood.
  • conifers such as Crypt 0 meria (cedar), P icea (ezoma, spruce, oshuyu spruce, sika pine), Pinus (radius pine, akamatsu, black pine, etc.), Thuja (bay Japanese cedars and cats), T suga (e.g., pegga), hardwoods such as E uca 1 yptus (eucalyptus), Fagus (beech), Quercus (oak, oak, etc.), and Acacia (acacia) Is raised.
  • Crypt 0 meria cedar
  • P icea ezoma, spruce, oshuyu spruce, sika pine
  • Pinus radius pine, akamatsu, black pine, etc.
  • Thuja bay Japanese cedars and cats
  • T suga
  • test method is as follows.
  • model white liquor was prepared of sodium hydroxide 70 GZL Contact and sodium sulfide 3 0 GZL, sodium carbonate 1 5 g / L (both N a 2 0 equivalent), the active alkali the addition of 1 4, 1 6, 1 8% by weight; was added at a rate of (vs.
  • the cooking liquor is assumed to be a polysulfide solution obtained by oxidizing the model white liquor of the composition of Comparative Example 1 with activated carbon catalyst, and assuming a reaction rate of 60% and a selectivity of 63%.
  • Sodium hydroxide 70 gZL, Na 2 S form 12.0 g / L, sodium carbonate 15 g / L and sodium thiosulfate 3.3 g / (all converted to Na 20 )
  • sulfur polysulfide 5.9 g / (sulfur conversion) model polysulfide cooking liquor was prepared.
  • Nickel plate on anode stack nickel foam on anode (100 mm x 20 mm x 4 mm, average mesh diameter of 0.5 mm, anode surface area per anode chamber volume: 56 0 m 2 Zm 3 , surface area with respect to the diaphragm area: 28 m 2 / m 2 ), a two-chamber electrolytic cell composed of iron expansion metal as a force source and a fluororesin cation exchange membrane as a diaphragm Assembled.
  • the anode chamber is 100 mm high, 20 mm wide and 4 mm thick.
  • the force source chamber is 100 mm high, 20 mm wide and 5 mm thick, and the effective area of the diaphragm is 20 cm.
  • the anode chamber is 100 mm high, 20 mm wide and 4 mm thick.
  • the force source chamber is 100 mm high, 20 mm wide and 5 mm thick, and the effective area of the diaphragm is 20 cm.
  • the digestion was performed under the same temperature conditions as in Comparative Example 1.
  • the kappa monovalent value and pulp yield after cooking are as follows. AA addition rate 0 / o Kappa monovalent pulp yield%
  • the digestion was performed under the same temperature conditions as in Comparative Example 1.
  • the kappa monovalent value and pulp yield after cooking are as follows.
  • Comparative Example 1 is positioned as one of the standard cooking conditions for defining the cooking liquor of the present invention.Comparative Examples and Examples described below were performed in Comparative Examples 1 to 5 and Examples 1 and 2. This is an example in which the same cooking liquor is used under the same cooking conditions as that of a conventional cooking and applied to different types of wood. ⁇ Comparative Example 6>
  • Example 1 The same experiment as in Example 1 was performed using the same wood chips as in Comparative Example 6 and the same cooking liquor as in Example 1.
  • the kappa monovalent value and pulp yield after cooking are as follows.
  • Example 2 The same experiment as in Example 2 was performed using the same wood chips as in Comparative Example 6 and using the same cooking liquor as in Example 2.
  • the kappa monovalent value and pulp yield after cooking are as follows.
  • Example 1 The same experiment as in Example 1 was performed using the same wood chips as in Comparative Example 11 and the same cooking liquor as in Example 1.
  • the kappa monovalent value and pulp yield after cooking are as follows.
  • Example 2 The same experiment as in Example 2 was performed using the same wood chips as in Comparative Example 11 and the same cooking liquor as in Example 2.
  • the kappa monovalent value and pulp yield after cooking are as follows.
  • the pulp yield can be further improved, and the relationship between monovalent kappa and pulp yield can be further improved. That is, according to the present invention, the pulp monovalent value at the same active alkali addition rate is reduced, and the pulp yield is improved at the same motive power value. The effect of reducing the load on the recovery boiler is achieved. Moreover, these effects can be achieved without breaking the chemical solution recovery balance in the pulp mill.

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  • Inorganic Chemistry (AREA)
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Abstract

L'invention concerne une lessive de cuisson destinée à la production de pâte à papier. Lorsqu'on cuit un copeau standard avec cette lessive de cuisson à un profil de température correspondant à une lessive de cuisson standard et à un ratio de lessive de 3,0 L/kg (sur la base d'un copeau totalement sec) pour produire une pâte à papier présentant une valeur Kappa de 18, le copeau standard étant un copeau de bois offrant une pâte à papier présentant une valeur Kappa de 18 et un rendement variant entre 50 et 51 % grâce à l'utilisation d'une lessive de cuisson standard à composition spécifique dans des conditions identiques et avec le même ratio de lessive, on obtient une augmentation de rendement de 3,5 % ou plus et une réduction de 2 % ou plus du ratio d'addition d'un alcali actif à la pâte à papier. L'invention concerne également un procédé de production d'une pâte à papier avec ladite lessive de cuisson. On peut utiliser cette lessive de cuisson pour améliorer la relation entre la valeur Kappa et le rendement de la pâte à papier, pour diminuer la quantité de produits chimiques nécessaires et pour réduire la charge d'un lessiveur destiné à la récupération.
PCT/JP2000/003834 1999-06-15 2000-06-13 Lessive de cuisson pour pate a papier et procede de production de pate a papier WO2000077294A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2001503731A JP4704638B2 (ja) 1999-06-15 2000-06-13 パルプ蒸解液およびパルプ製造方法
AU51097/00A AU5109700A (en) 1999-06-15 2000-06-13 Digesting liquor for pulp and method for producing pulp

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16900299 1999-06-15
JP11/169002 1999-06-15

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WO2000077294A1 true WO2000077294A1 (fr) 2000-12-21

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7056418B2 (en) 1999-06-15 2006-06-06 Kawasaki Kasei Chemicals Ltd. Cooking method for pulp
WO2010137535A1 (fr) * 2009-05-26 2010-12-02 日本製紙株式会社 Procédé pour lessiver un matériau lignocellulosique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5729690A (en) * 1980-07-31 1982-02-17 Sanyo Kokusaku Pulp Co Pulping of lignocellulose material
JPH08218290A (ja) * 1995-02-09 1996-08-27 Mitsubishi Paper Mills Ltd 非塩素漂白パルプの製造方法
WO1997041295A1 (fr) * 1996-04-26 1997-11-06 Asahi Glass Company Ltd. Procede de production de polysulfures par oxydation electrolytique
JPH11100783A (ja) * 1997-09-26 1999-04-13 Oji Paper Co Ltd リグノセルロース材料のパルプ化法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1073161A (fr) * 1975-09-05 1980-03-11 Canadian Industries Limited Procede de delignification
JPH09268488A (ja) * 1996-03-27 1997-10-14 Mitsubishi Paper Mills Ltd クラフトパルプの製造方法
JPH10280290A (ja) * 1997-03-31 1998-10-20 Mitsubishi Paper Mills Ltd 蒸解廃液燃焼溶融物の処理方法及びクラフトパルプの製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5729690A (en) * 1980-07-31 1982-02-17 Sanyo Kokusaku Pulp Co Pulping of lignocellulose material
JPH08218290A (ja) * 1995-02-09 1996-08-27 Mitsubishi Paper Mills Ltd 非塩素漂白パルプの製造方法
WO1997041295A1 (fr) * 1996-04-26 1997-11-06 Asahi Glass Company Ltd. Procede de production de polysulfures par oxydation electrolytique
JPH11100783A (ja) * 1997-09-26 1999-04-13 Oji Paper Co Ltd リグノセルロース材料のパルプ化法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7056418B2 (en) 1999-06-15 2006-06-06 Kawasaki Kasei Chemicals Ltd. Cooking method for pulp
WO2010137535A1 (fr) * 2009-05-26 2010-12-02 日本製紙株式会社 Procédé pour lessiver un matériau lignocellulosique
JP4629164B2 (ja) * 2009-05-26 2011-02-09 日本製紙株式会社 リグノセルロース材料の蒸解法

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