NO852330L - PROCEDURES FOR PEROXIDE BLACKING OF CELLULOSE-CONTAINING Masses. - Google Patents
PROCEDURES FOR PEROXIDE BLACKING OF CELLULOSE-CONTAINING Masses.Info
- Publication number
- NO852330L NO852330L NO852330A NO852330A NO852330L NO 852330 L NO852330 L NO 852330L NO 852330 A NO852330 A NO 852330A NO 852330 A NO852330 A NO 852330A NO 852330 L NO852330 L NO 852330L
- Authority
- NO
- Norway
- Prior art keywords
- peroxide
- bleaching
- cellulose
- blacking
- procedures
- Prior art date
Links
- 150000002978 peroxides Chemical class 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 7
- 238000004061 bleaching Methods 0.000 claims description 19
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 9
- 239000000395 magnesium oxide Substances 0.000 claims description 8
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 7
- 239000008139 complexing agent Substances 0.000 claims description 2
- 239000002243 precursor Substances 0.000 claims description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 239000000126 substance Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 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 2
- 239000002585 base Substances 0.000 description 2
- SPAGIJMPHSUYSE-UHFFFAOYSA-N Magnesium peroxide Chemical compound [Mg+2].[O-][O-] SPAGIJMPHSUYSE-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012978 lignocellulosic material Substances 0.000 description 1
- 229960004995 magnesium peroxide Drugs 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- JESHZQPNPCJVNG-UHFFFAOYSA-L magnesium;sulfite Chemical compound [Mg+2].[O-]S([O-])=O JESHZQPNPCJVNG-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229960003330 pentetic acid Drugs 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- RPACBEVZENYWOL-XFULWGLBSA-M sodium;(2r)-2-[6-(4-chlorophenoxy)hexyl]oxirane-2-carboxylate Chemical compound [Na+].C=1C=C(Cl)C=CC=1OCCCCCC[C@]1(C(=O)[O-])CO1 RPACBEVZENYWOL-XFULWGLBSA-M 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 230000002087 whitening effect Effects 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
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
FREMGANGSMÅTE VED PEROKSYDBLEKING AV CELLULOSEHOLDIGE MASSER PROCEDURE FOR PEROXIDE BLEACHING OF CELLULOSE-CONTAINING PUPS
Foreliggende oppfinnelse angår peroksydbleking av ligno-celluloseholdig materiale, spesielt mekanisk, termomekanisk og kjemimekanisk masse i utbyttesområde over 70% forttrinn-vis 80-98%, såkalte høybyttemasser. The present invention relates to peroxide bleaching of ligno-cellulosic material, especially mechanical, thermomechanical and chemimechanical pulp in the yield range above 70% gradually 80-98%, so-called high yield pulps.
Peroksydbleking foregår i alkalisk miljø, og etter dagens teknikk anvendes natriumhydroksyd som base for dette for-mål. I tillegg til hjelpekjemikalier for å oppnå maksimal lyshet under blekingen. Disse hjelpekjemikaliene er i første rekke natriumsilikat og magnesiumsulfat, og i de fleste tilfeller anvendes også en kompleksdanner, så som DTPA. (DTP'A = Na-salt av dietylen-triamin-pentaeddiksyre ) I norsk søknad nr. 811225 med tittelen: "Fremgangsmåten for fremstilling av praktisk talt harpiksfri cellulose masse" er vist eksempler på peroksydblekning under anvendelse av Na-silikat eller NaOH som alkali. Peroxide bleaching takes place in an alkaline environment, and according to current technology, sodium hydroxide is used as a base for this purpose. In addition to auxiliary chemicals to achieve maximum lightness during bleaching. These auxiliary chemicals are primarily sodium silicate and magnesium sulphate, and in most cases a complexing agent, such as DTPA, is also used. (DTP'A = Na-salt of diethylene-triamine-pentaacetic acid) In Norwegian application no. 811225 with the title: "Procedure for the production of practically resin-free cellulose pulp" examples of peroxide bleaching using Na-silicate or NaOH as alkali are shown .
En mer omfattende omtale av bleking under anvendelse av peroksyd er å finne i "The Bleaching of Pulp", Third Edition, Revised, tappi press, kapittel 8. A more extensive discussion of bleaching using peroxide is to be found in "The Bleaching of Pulp", Third Edition, Revised, tappi press, Chapter 8.
En typisk resept for peroksydbleking av en mekanisk masse vil således bestå av følgende stoffer: A typical prescription for peroxide bleaching of a mechanical pulp will thus consist of the following substances:
Natriumhydroksyd og hjelpekjemikalier utgjør en vesentlig del av blekekostnadene for peroksydbleking, idet kostnadene for disse vil ligge i størrelseorden 50 % av peroksydkostnadene. Sodium hydroxide and auxiliary chemicals form a significant part of the bleaching costs for peroxide bleaching, as the costs for these will be in the order of 50% of the peroxide costs.
Det har nå overraskende vist seg at man under peroksydbleking av høyutbyttemasser kan erstatte alle tilleggskjemikalier inkludert natriumhydroksyd med ett eneste kjemikalium, nemlig magnesiumoksyd. Den tidligere omtalte blekeresept vil ifølge oppfinnelsen nå se slik ut: It has now surprisingly been shown that during peroxide bleaching of high-yield pulps, all additional chemicals, including sodium hydroxide, can be replaced with a single chemical, namely magnesium oxide. According to the invention, the previously mentioned whitening recipe will now look like this:
Dette innebærer en betydelig kostnadsreduksjon, opp til 50-60 % på tilleggskjemikalier, dvs. ca. 20-30 kr/t., samtidig som blekeprosessen forenkles i stor grad. Oppfinnelsen innebærer også at utbyttetapet under blekeprosessen blir mindre sammenlignet med dagens teknikk, hvor natriumhydroksyd anvendes som base. Dette betyr også redusert utslipp fra et blekeri på magnesiumoksyd som base. This entails a significant cost reduction, up to 50-60% on additional chemicals, i.e. approx. NOK 20-30/h, while the bleaching process is greatly simplified. The invention also means that the yield loss during the bleaching process is smaller compared to current technology, where sodium hydroxide is used as a base. This also means reduced emissions from a magnesium oxide-based bleaching plant.
For integrerte fabrikker som har produskjon av magnesium-sulfittmasse med kjemikaliegjenvinning og samtidig produksjon av peroksydbleket høybyttemasse, vil man p.g.a. foreliggende oppfinnelse kunne forbrenne blekeavluten fra høybyttemassen og gjenvinne magnesiumoksydet. Samtidig elimineres utslippsbelastningen fra blekeriet. For integrated factories that have production of magnesium sulphite pulp with chemical recycling and simultaneous production of peroxide-bleached high-yield pulp, one will, due to the present invention could incinerate the bleaching liquor from the hay stock and recover the magnesium oxide. At the same time, the emission burden from the bleaching plant is eliminated.
Oppfinnelsen kan illustreres med følgende tabell, hvor tre massetyper er bleket etter dagens teknikk (la, 2a og 3a) og etter ny fremgangsmåte ifølge oppfinnelsen (lb, 2b og 3b): Blekingen er foretatt^ed 20% konsistens ved 70^C og 3 timers reaksjonstid. The invention can be illustrated with the following table, where three pulp types are bleached according to current technology (la, 2a and 3a) and according to a new method according to the invention (lb, 2b and 3b): The bleaching is carried out with 20% consistency at 70°C and 3 hours reaction time.
Magnesiumoksyd ble tilsatt i form av en oppslemning til de respektive masser med etterfølgende avpresning til ønsket massekonsistens. Eventuelt kan man istedenfor en blanding av magnesiumoksyd og hydrogenperoksyd anvende en foreløper for disse forbindelser, så som magnesiumperoksyd, hvor det vanlige kommersielle produkt inneholder opptil 50% MgG^Magnesium oxide was added in the form of a slurry to the respective masses with subsequent pressing to the desired mass consistency. Alternatively, instead of a mixture of magnesium oxide and hydrogen peroxide, a precursor for these compounds can be used, such as magnesium peroxide, where the usual commercial product contains up to 50% MgG^
mens resten utgjøres hovedsaklig av MgO. while the rest consists mainly of MgO.
Claims (1)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO852330A NO852330L (en) | 1985-06-10 | 1985-06-10 | PROCEDURES FOR PEROXIDE BLACKING OF CELLULOSE-CONTAINING Masses. |
| SE8602065A SE8602065L (en) | 1985-06-10 | 1986-05-06 | PROCEDURES FOR PEROXID WHEATING OF CELLULOSA-MADE MASS |
| DE19863617942 DE3617942A1 (en) | 1985-06-10 | 1986-05-28 | METHOD FOR PEROXIDE BLEACHING OF HIGH-PERFORMANCE LIGNOCELLULOSE PULPS |
| FI862437A FI862437A (en) | 1985-06-10 | 1986-06-06 | FOERFARANDE VID PEROXIDBLEKNING AV CELLULOSAHALTIGA MASSOR. |
| FR8608272A FR2583078A1 (en) | 1985-06-10 | 1986-06-09 | Process for peroxide bleaching of pulps containing cellulose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO852330A NO852330L (en) | 1985-06-10 | 1985-06-10 | PROCEDURES FOR PEROXIDE BLACKING OF CELLULOSE-CONTAINING Masses. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO852330L true NO852330L (en) | 1986-12-11 |
Family
ID=19888331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO852330A NO852330L (en) | 1985-06-10 | 1985-06-10 | PROCEDURES FOR PEROXIDE BLACKING OF CELLULOSE-CONTAINING Masses. |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE3617942A1 (en) |
| FI (1) | FI862437A (en) |
| FR (1) | FR2583078A1 (en) |
| NO (1) | NO852330L (en) |
| SE (1) | SE8602065L (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4400954B4 (en) * | 1994-01-14 | 2007-03-01 | Stefan Kürzeder | Process for increasing the brightness of bleaching wood pulp with hydrogen peroxide |
| AUPN352095A0 (en) * | 1995-06-13 | 1995-07-06 | Ici Australia Operations Proprietary Limited | Peroxide bleaching of pulp |
| AU2001256024A1 (en) * | 2000-05-04 | 2001-11-12 | University Of New Brunswick | Peroxide bleaching of wood pulp |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5545806A (en) * | 1978-09-21 | 1980-03-31 | Oji Paper Co | Peroxide bleaching method of wood pulp |
| JPS5922832B2 (en) * | 1978-12-09 | 1984-05-29 | 王子製紙株式会社 | Method for producing peroxide bleached pulp |
| DE3428352A1 (en) * | 1984-08-01 | 1986-02-13 | Degussa Ag, 6000 Frankfurt | METHOD FOR DELIGNIFICATION AND BLEACHING OF CELLULAS |
-
1985
- 1985-06-10 NO NO852330A patent/NO852330L/en unknown
-
1986
- 1986-05-06 SE SE8602065A patent/SE8602065L/en not_active Application Discontinuation
- 1986-05-28 DE DE19863617942 patent/DE3617942A1/en not_active Ceased
- 1986-06-06 FI FI862437A patent/FI862437A/en not_active Application Discontinuation
- 1986-06-09 FR FR8608272A patent/FR2583078A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| SE8602065L (en) | 1986-12-11 |
| FR2583078A1 (en) | 1986-12-12 |
| SE8602065D0 (en) | 1986-05-06 |
| DE3617942A1 (en) | 1986-12-11 |
| FI862437A (en) | 1986-12-11 |
| FI862437A0 (en) | 1986-06-06 |
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