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
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 |
---|---|---|---|
ES97108710T ES2164279T3 (es) | 1997-05-30 | 1997-05-30 | Procedimiento para la fabricacion de celulosas especiales blanqueadas. |
AT97108710T ATE207153T1 (de) | 1997-05-30 | 1997-05-30 | Verfahren zur herstellung von gebleichten spezialzellstoffen |
PT97108710T PT881326E (pt) | 1997-05-30 | 1997-05-30 | Processo para a preparacao de celuloses speciais branqueadas |
EP97108710A EP0881326B1 (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 |
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 DE DE59704964T patent/DE59704964D1/de not_active Expired - Lifetime
- 1997-05-30 AT AT97108710T patent/ATE207153T1/de not_active IP Right Cessation
- 1997-05-30 DK DK97108710T patent/DK0881326T3/da active
- 1997-05-30 EP EP97108710A patent/EP0881326B1/de not_active Expired - Lifetime
- 1997-05-30 ES ES97108710T patent/ES2164279T3/es not_active Expired - Lifetime
- 1997-05-30 PT PT97108710T patent/PT881326E/pt unknown
Also Published As
Publication number | Publication date |
---|---|
DE59704964D1 (de) | 2001-11-22 |
DK0881326T3 (da) | 2002-02-11 |
EP0881326A1 (de) | 1998-12-02 |
ATE207153T1 (de) | 2001-11-15 |
PT881326E (pt) | 2002-04-29 |
ES2164279T3 (es) | 2002-02-16 |
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