EP0881326B1 - Verfahren zur Herstellung von gebleichten Spezialzellstoffen - Google Patents
Verfahren zur Herstellung von gebleichten Spezialzellstoffen Download PDFInfo
- Publication number
- EP0881326B1 EP0881326B1 EP97108710A EP97108710A EP0881326B1 EP 0881326 B1 EP0881326 B1 EP 0881326B1 EP 97108710 A EP97108710 A EP 97108710A EP 97108710 A EP97108710 A EP 97108710A EP 0881326 B1 EP0881326 B1 EP 0881326B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bleaching
- pulp
- additive
- derivatives
- added
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- 229920002678 cellulose Polymers 0.000 title claims abstract description 8
- 239000001913 cellulose Substances 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title claims description 53
- 238000004061 bleaching Methods 0.000 claims abstract description 51
- 239000000654 additive Substances 0.000 claims abstract description 29
- 239000000126 substance Substances 0.000 claims abstract description 10
- 230000015556 catabolic process Effects 0.000 claims abstract description 8
- 238000006731 degradation reaction Methods 0.000 claims abstract description 7
- 230000000996 additive effect Effects 0.000 claims description 18
- 241000196324 Embryophyta Species 0.000 claims description 10
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 10
- 240000000907 Musa textilis Species 0.000 claims description 6
- 240000000797 Hibiscus cannabinus Species 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 3
- 244000198134 Agave sisalana Species 0.000 claims description 2
- 240000000491 Corchorus aestuans Species 0.000 claims description 2
- 235000011777 Corchorus aestuans Nutrition 0.000 claims description 2
- 235000010862 Corchorus capsularis Nutrition 0.000 claims description 2
- 229920001131 Pulp (paper) Polymers 0.000 claims description 2
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 claims description 2
- 150000004056 anthraquinones Chemical class 0.000 claims description 2
- YAZJBJXUPFNJSH-UHFFFAOYSA-N anthracene-9,10-dione;sulfurous acid Chemical compound OS(O)=O.C1=CC=C2C(=O)C3=CC=CC=C3C(=O)C2=C1 YAZJBJXUPFNJSH-UHFFFAOYSA-N 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000000835 fiber Substances 0.000 description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 13
- 238000006116 polymerization reaction Methods 0.000 description 8
- 238000010411 cooking Methods 0.000 description 7
- 239000004115 Sodium Silicate Substances 0.000 description 5
- 239000007844 bleaching agent Substances 0.000 description 5
- 229910052911 sodium silicate Inorganic materials 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 230000031018 biological processes and functions Effects 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000002657 fibrous material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 235000013311 vegetables Nutrition 0.000 description 3
- 240000006240 Linum usitatissimum Species 0.000 description 2
- 235000004431 Linum usitatissimum Nutrition 0.000 description 2
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 2
- 238000003421 catalytic decomposition reaction Methods 0.000 description 2
- 239000002738 chelating agent Substances 0.000 description 2
- 238000001311 chemical methods and process Methods 0.000 description 2
- 150000001804 chlorine Chemical class 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 230000005226 mechanical processes and functions Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 240000004246 Agave americana Species 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 239000004155 Chlorine dioxide Substances 0.000 description 1
- 241000220457 Crotalaria Species 0.000 description 1
- 244000151799 Crotalaria ochroleuca Species 0.000 description 1
- 235000002312 Crotalaria ochroleuca Nutrition 0.000 description 1
- 241000218033 Hibiscus Species 0.000 description 1
- 235000005206 Hibiscus Nutrition 0.000 description 1
- 235000007185 Hibiscus lunariifolius Nutrition 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 241000604152 Macrochloa tenacissima Species 0.000 description 1
- -1 Mn ++ Chemical class 0.000 description 1
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 238000004182 chemical digestion Methods 0.000 description 1
- 235000019398 chlorine dioxide Nutrition 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000004426 flaxseed Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 230000000968 intestinal effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- LQPLDXQVILYOOL-UHFFFAOYSA-I pentasodium;2-[bis[2-[bis(carboxylatomethyl)amino]ethyl]amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC(=O)[O-])CCN(CC([O-])=O)CC([O-])=O LQPLDXQVILYOOL-UHFFFAOYSA-I 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 150000004804 polysaccharides Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002023 wood 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
-
- 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
- D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
Definitions
- the present invention relates to a method for manufacturing of bleached special pulps from annual plants the preamble of claim 1.
- the physical properties of paper include, for example Basis weight, paper thickness, volume, porosity, mechanical strength, whiteness, opacity, etc.
- Chemical properties are, for example, the alkalinity of the Paper, amount and type of fillers, amount and type of impregnation salts, Amount and type of polysaccharide components in the raw material used, e.g. of pentosans, lot and type of non-polysaccharide residues used in the Raw material such as Resin, etc., amount and type of the manufacturing process auxiliary materials used etc.
- US-A-4 248 663 describes an alkaline cooking in the presence of additives such as anthraquinone for the production of wood pulp or annual plants.
- the determination of the viscosity or the degree of polymerization belongs in the optimization of paper technology Properties of pulp to the important criteria for the Choice of pulp.
- paper types that are supposed to be lightweight (e.g. 7.0 - 35 g / m 2 ) and have good filtration properties for gases and liquids (e.g. highly porous filter wrapping papers for cigarette filters, cigarette paper, teabag filter papers etc.) or have good impregnation properties (e.g. electrolytic Papers, fiber intestinal papers, etc.), special pulps based on annual plants are required as fiber raw materials.
- gases and liquids e.g. highly porous filter wrapping papers for cigarette filters, cigarette paper, teabag filter papers etc.
- impregnation properties e.g. electrolytic Papers, fiber intestinal papers, etc.
- special pulps based on annual plants are required as fiber raw materials.
- the plants are processed into special pulp generally in a first stage by means of a mechanical and / or biological process.
- the unwanted vegetable parts removed.
- the non-cellulose-containing components are broken down and the chemical digestion for the subsequent chemical Process facilitated.
- the fibrous raw material becomes certain components, i.e. the unwanted vegetable Parts removed, which are the removed components act about 20 to even 70 wt .-% of the original mass can.
- the bleaching process depends on the bleach and used method of the degree of polymerization of the pulp reduced. Such a reduction during the bleaching process is predominantly undesirable, however, because the degree of polymerization is reduced e.g. the solubility of the pulp, its behavior in the initial or slightly ground state and the ability to impregnate of the individual fibers changes.
- degree of polymerization e.g. the solubility of the pulp, its behavior in the initial or slightly ground state and the ability to impregnate of the individual fibers changes.
- the object of the present invention is therefore a chlorine-free process specify for the production of bleached special pulps, with a clear one with the same whiteness of the pulp Reduction in the degradation of the degree of polymerization of the pulp is achieved in the bleaching process.
- Special pulp can according to the invention according to the desired Properties from a wide variety of fiber materials getting produced.
- suitable fiber-donating plants such as flax (Linum usitatissimum), Hemp (Canabis Sativa), jute (Carchorus olitorius), Kenaf (Hibiscus Sabdoriffa), Sun hemp (Crotalaria junicea), Manila hemp (Musa textilis), Sisal (Agave sisalina), Esparto (Stipa tenacissima) etc.
- flax Lium usitatissimum
- Hemp Canabis Sativa
- jute Carchorus olitorius
- Kenaf Hibiscus Sabdoriffa
- Sun hemp Crotalaria junicea
- Manila hemp Mosal (Agave sisalina), Esparto (Stipa tenacissima) etc.
- the fiber donors Plants under a mechanical or biological Process or a combination thereof from the undesirable exempted from vegetable parts.
- a fiberization then takes place in a further process step of the plants in single fibers in a chemical-mechanical Process stage.
- they are already mechanical or biologically prepared fibers with inorganic and / or organic chemicals cooked and, if necessary, mechanically frayed.
- usable organic chemicals to influence the delignification process for example Call antrachinone.
- Any pulp obtained from the cooking process Cooking process for example an alkaline process or a neutral sulfite process.
- it can be according to the invention in the case of the pulps used for pulps Trade hard fibers or pulps from soft fibers.
- the pulp obtained during the cooking process is then as part of a single or multi-stage bleaching process bleached.
- this bleaching takes place under Use of additives.
- the additives are Naphthalene or derivatives thereof or Antrachinone or derivatives thereof, in particular antrachinone or Derivatives thereof, such as 9,10-antrachinone.
- the additives are usually used in amounts of 0.001 to 10% by weight, expediently from 0.01 to 1% by weight, preferably from 0.05 to 0.55% by weight, in particular 0.1 to 0.3% by weight, based on the mass of absolutely dry fibers, which is to be dispersed in the bleaching liquor.
- bleaching is used in the bleaching process of chlorine and its derivatives and the chlorine-free bleaching processes using other special oxidizing agents distinguished.
- One of the oldest bleaching agents is chlorine and its derivatives. Because when bleaching with chlorine or its derivatives organically bound chlorine derivatives, which are undesirable for environmental reasons are larger (when using chlorine gas) or smaller amounts (when using chlorine dioxide) arise this type of bleaching process is less preferred today.
- a bleaching process using chlorine-free bleaching agents for example using oxygen (O 2 ), ozone (O 3 ), hydrogen peroxide (H 2 O 2 ), peracetic acid (C 2 H 4 ), is predominantly used today O 3 ) etc., preferred.
- the bleaching process is concerned a single or multi-stage chlorine-free Bleaching process. It is preferably chlorine-free Bleaching process from several bleaching stages.
- the bleaching liquor contains various others Components such as bleaching chemicals and other auxiliary components.
- the bleaching liquor for example, can contain chelating agents such as sodium diethylenetriaminepentaacetate (DTPA). , are added. These chelating agents bind the metals contained in the bleaching liquor and thus prevent catalytic decomposition of the bleaching agents.
- chelating agents such as sodium diethylenetriaminepentaacetate (DTPA).
- Example 1 unbleached cellulose made from kenaf or abaca fibers was used as the pulp.
- the pulp suspension was adjusted to the desired consistency, adjusted to the desired pH with NaOH, buffered with sodium silicate, warmed and mixed with H 2 O 2 as a bleaching chemical.
- Naphthalene or antrachinone was used as an additive in an amount of 0.2% additive per kg of absolutely dry fibers.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
- [η]
- Grenzviskosität
- KM
- Konstante
- M
- Molmasse
- η
- Viskosität einer Zellstofflösung
- ηo
- Viskosität des verwendeten Lösungsmittels
- t
- Auslaufzeit einer Zellstofflösung im Viskosimeter
- to
- Auslaufzeit eines Lösungsmittels im Viskosimeter
- c
- Konzentration der Zellstofflösung
| Versuch 1 | |||
| Additiv | [Typ] | 0 | Naphthalin |
| Halbstoff | [Typ] | Kenaf | Kenaf |
| Fasermenge | [kg] | 7,00 | 7,00 |
| H2O | [kg] | 92,072 | 92,072 |
| NaOH 100%-ig | [kg] | 0,088 | 0,088 |
| pH | 10,8 | 10,8 | |
| Natriumsilikat | [kg] | 0,140 | 0,140 |
| Temperatur | [°C] | 70 | 70 |
| Bleichdauer | [h] | 3,0 | 3,0 |
| H2O2 35%-ig | [kg] | 0,700 | 0,700 |
| Versuch 2 | |||
| Additiv | [Typ] | 0 | Naphthalin |
| Halbstoff | [Typ] | Abaca | Abaca |
| Fasermenge | [kg] | 7,00 | 7,00 |
| H2O | [kg] | 92,072 | 92,072 |
| NaOH 100%-ig | [kg] | 0,088 | 0,088 |
| pH | 10,9 | 10,9 | |
| Natriumsilikat | [kg] | 0,140 | 0,140 |
| Temperatur | [°C] | 70 | 70 |
| Bleichdauer | [h] | 3,0 | 3,0 |
| H2O235%-ig | [kg] | 0,700 | 0,700 |
| Versuch 3 | |||
| Additiv | [Typ] | 0 | Antrachinon |
| Halbstoff | [Typ] | Kenaf | Kenaf |
| Fasermenge | [kg] | 7,00 | 7,00 |
| H2O | [kg] | 92,072 | 92,072 |
| NaOH 100%-ig | [kg] | 0,088 | 0,088 |
| pH | 10,8 | 10,8 | |
| Natriumsilikat | [kg] | 0,140 | 0,140 |
| Temperatur | [°C] | 70 | 70 |
| Bleichdauer | [h] | 3,0 | 3,0 |
| H2O235%-ig | [kg] | 0,700 | 0,700 |
| Versuch 4 | |||
| Additiv | [Typ] | 0 | Antrachinon |
| Halbstoff | [Typ] | Abaca | Abaca |
| Fasermenge | [kg] | 7,00 | 7,00 |
| H2O | [kg] | 92,072 | 92,072 |
| NaOH 100%-ig | [kg] | 0,088 | 0,088 |
| pH | 11,0 | 11,0 | |
| Natriumsilikat | [kg] | 0,140 | 0,140 |
| Temperatur | [°C] | 70 | 70 |
| Bleichdauer | [h] | 3,0 | 3,0 |
| H2O2 35%-ig | [kg] | 0,700 | 0,700 |
| Ergebnisse | ||
| Versuch 1 | ohne Additiv | mit Additiv |
| Weiße (%) | 63,0 | 63,4 |
| Viskosität (dm3/kg) | 513 | 610 |
| Versuch 2 | ohne Additiv | mit Additiv |
| Weiße (%) | 80,0 | 80,3 |
| Viskosität (dm3/kg) | 1273 | 1520 |
| Versuch 3 | ohne Additiv | mit Additiv |
| Weiße (%) | 69,3 | 70,1 |
| Viskosität(dm3/kg) | 683 | 759 |
| Versuch 4 | ohne Additiv | mit Additiv |
| Weiße (%) | 81,4 | 81,2 |
| Viskosität (dm3/kg) | 1463 | 1787 |
| Ergebnisse | |||||
| Ungebl. Halbstoff | [gekocht] | Na + A.Q. | Na + SO3 + A.Q. | ||
| Additiv | [Typ] | 0 | A.Q. | 0 | A.Q. |
| Weiße | [%] | 72,1 | 71,8 | 73,2 | 73,8 |
| Viskosität | [dm3/kg] | 740 | 884 | 621 | 811 |
Claims (8)
- Verfahren zur Reduzierung des Abbaus von Cellulose und Derivaten hiervon unter Mitverwendung von Additiven, die zum Halbstoff zugefügt werden, bei der Herstellung von gebleichten Spezialzellstoffen aus Einjahrespflanzen, dadurch gekennzeichnet, daß bei einem vollkommen chlorfreien Bleichprozeß Additive zugefügt werden, die aus Naphthalin, Derivaten hiervon, Anthrachinon oder Derivaten hiervon ausgewählt sind und nicht mit dem Halbstoff, den Bleichchemikalien und anderen Komponenten der Bleichflotte reagieren, aber den Abbau von Cellulose und den Derivaten hiervon mindern.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß es sich bei den Halbstoffen um Halbstoffe aus Hartfasern (wie z.B. Abaca, Sisal, usw.) handelt.
- Verfahren nach einem der Ansprüche loder 2. dadurch gekennzeichnet, daß es sich bei den Halbstoffen um Halbstoffe aus Weichfasern (wie z.B. Jute, Kenaf, usw.) handelt.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß 0,001 - 10 Gew.-% Additiv, bezogen auf die Masse an absolut trockenen Fasern, die in der Bleichflotte dispergiert werden soll, zugegeben werden.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß 0,01 - 1 Gew.-% Additiv, bezogen auf die Masse an absolut trockenen Fasern, die in der Eleichflotte dispergiert werden soll, zugegeben werden.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß 0,05 - 0,55 Gew.-% Additiv, bezogen auf die Masse an absolut trockenen Fasern, die in der Eleichflotte dispergiert werden soll, zugegeben werden.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Halbstoffe in einem Alkali-Anthrachinon-Verfahren vor dem Bleichprozeß gekocht wurden.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Halbstoffe vor dem Eleichprozeß in einem Neutralsulfit-Anthrachinon-Verfahren gekocht wurden.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97108710A EP0881326B1 (de) | 1997-05-30 | 1997-05-30 | Verfahren zur Herstellung von gebleichten Spezialzellstoffen |
| AT97108710T ATE207153T1 (de) | 1997-05-30 | 1997-05-30 | Verfahren zur herstellung von gebleichten spezialzellstoffen |
| DE59704964T DE59704964D1 (de) | 1997-05-30 | 1997-05-30 | Verfahren zur Herstellung von gebleichten Spezialzellstoffen |
| DK97108710T DK0881326T3 (da) | 1997-05-30 | 1997-05-30 | Fremgangsmåde til fremstilling af blegede specialcellulosemasser |
| PT97108710T PT881326E (pt) | 1997-05-30 | 1997-05-30 | Processo para a preparacao de celuloses speciais branqueadas |
| ES97108710T ES2164279T3 (es) | 1997-05-30 | 1997-05-30 | Procedimiento para la fabricacion de celulosas especiales blanqueadas. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97108710A EP0881326B1 (de) | 1997-05-30 | 1997-05-30 | Verfahren zur Herstellung von gebleichten Spezialzellstoffen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0881326A1 EP0881326A1 (de) | 1998-12-02 |
| EP0881326B1 true EP0881326B1 (de) | 2001-10-17 |
Family
ID=8226853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97108710A Expired - Lifetime EP0881326B1 (de) | 1997-05-30 | 1997-05-30 | Verfahren zur Herstellung von gebleichten Spezialzellstoffen |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0881326B1 (de) |
| AT (1) | ATE207153T1 (de) |
| DE (1) | DE59704964D1 (de) |
| DK (1) | DK0881326T3 (de) |
| ES (1) | ES2164279T3 (de) |
| PT (1) | PT881326E (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AR088787A1 (es) * | 2011-08-30 | 2014-07-10 | Cargill Inc | Composicion de pulpa |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2367771A (en) * | 1941-10-08 | 1945-01-23 | Mathieson Alkali Works Inc | Bleaching cellulosic materials |
| US2478379A (en) * | 1948-07-30 | 1949-08-09 | Hercules Powder Co Ltd | Cellulose bleaching |
| US4248663A (en) * | 1978-07-05 | 1981-02-03 | Pulp And Paper Research Institute Of Canada | Pulping with an alkaline liquor containing a cyclic keto compound and an amino compound |
| SE434284B (sv) * | 1980-05-07 | 1984-07-16 | Mo Och Domsjoe Ab | Forfarande vid syrgasdelignifiering av kemiskt uppsluten cellulosamassa varvid aromatiska diaminer tillfores |
| US4298428A (en) * | 1980-08-07 | 1981-11-03 | Nalco Chemical Company | Use of additives in pulp bleaching processes to preserve pulp strength |
| US4295928A (en) * | 1980-08-07 | 1981-10-20 | Nalco Chemical Company | Phenolic compounds as viscosity preservatives during hypochlorite pulp bleaching |
| US4487656A (en) * | 1983-09-30 | 1984-12-11 | Melamine Chemicals, Inc. | Process for bleaching paper pulp using melamine as a viscosity stabilizer |
| JPS6112992A (ja) * | 1984-06-26 | 1986-01-21 | 新王子製紙株式会社 | リグノセルロ−ス物質の漂白方法 |
| DE4137761A1 (de) * | 1991-05-17 | 1992-11-19 | Call Hans Peter | Verfahren zur delignifizierung von lignocellulosehaltigem material, bleiche und behandlung von abwaessern mittels laccasen mit erweiteter wirksamkeit |
| WO1995033884A1 (en) * | 1994-06-02 | 1995-12-14 | Macmillan Bloedel Limited | Ozone bleaching |
| US5529662A (en) * | 1994-07-06 | 1996-06-25 | Macmillan Bloedel Limited | Method of bleaching cellulosic pulps with ozone and a protective amount of an N-alkylated urea |
-
1997
- 1997-05-30 AT AT97108710T patent/ATE207153T1/de not_active IP Right Cessation
- 1997-05-30 PT PT97108710T patent/PT881326E/pt unknown
- 1997-05-30 ES ES97108710T patent/ES2164279T3/es not_active Expired - Lifetime
- 1997-05-30 EP EP97108710A patent/EP0881326B1/de not_active Expired - Lifetime
- 1997-05-30 DK DK97108710T patent/DK0881326T3/da active
- 1997-05-30 DE DE59704964T patent/DE59704964D1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| PT881326E (pt) | 2002-04-29 |
| ATE207153T1 (de) | 2001-11-15 |
| DE59704964D1 (de) | 2001-11-22 |
| EP0881326A1 (de) | 1998-12-02 |
| ES2164279T3 (es) | 2002-02-16 |
| DK0881326T3 (da) | 2002-02-11 |
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