NO153342B - PROCEDURE FOR CELLULOSIZING CELLULOSE. - Google Patents
PROCEDURE FOR CELLULOSIZING CELLULOSE. Download PDFInfo
- Publication number
- NO153342B NO153342B NO792067A NO792067A NO153342B NO 153342 B NO153342 B NO 153342B NO 792067 A NO792067 A NO 792067A NO 792067 A NO792067 A NO 792067A NO 153342 B NO153342 B NO 153342B
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- Prior art keywords
- cellulose
- bleaching
- weight
- stage
- referred
- Prior art date
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- 229920002678 cellulose Polymers 0.000 title claims description 37
- 239000001913 cellulose Substances 0.000 title claims description 33
- 238000000034 method Methods 0.000 title claims description 19
- 238000004061 bleaching Methods 0.000 claims description 24
- 229910001919 chlorite Inorganic materials 0.000 claims description 9
- 229910052619 chlorite group Inorganic materials 0.000 claims description 9
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 7
- 159000000003 magnesium salts Chemical class 0.000 claims description 5
- 150000002978 peroxides Chemical class 0.000 claims description 5
- 239000008139 complexing agent Substances 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 235000010980 cellulose Nutrition 0.000 description 32
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 241000294754 Macroptilium atropurpureum Species 0.000 description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 10
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 8
- 241001070947 Fagus Species 0.000 description 5
- 235000010099 Fagus sylvatica Nutrition 0.000 description 5
- 241000218657 Picea Species 0.000 description 5
- 239000003513 alkali Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 229920002955 Art silk Polymers 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
- 229920000297 Rayon Polymers 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 description 2
- 229960002218 sodium chlorite Drugs 0.000 description 2
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 2
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- 239000004155 Chlorine dioxide Substances 0.000 description 1
- 201000004624 Dermatitis Diseases 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 241000219000 Populus Species 0.000 description 1
- 208000010668 atopic eczema Diseases 0.000 description 1
- 235000019398 chlorine dioxide Nutrition 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008719 thickening 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
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
Description
Oppfinnelsen vedrører en fleretrinns, minst tretrinns fremgangsmåte til helbleking av cellulose. The invention relates to a multi-stage, at least three-stage method for completely bleaching cellulose.
Fra DOS 23 27 900 og tysk patent 22 19 504 er det kjent å From DOS 23 27 900 and German patent 22 19 504 it is known to
bleke cellulose under anvendelse av peroksyder. bleach cellulose using peroxides.
Ved fremgangsmåten ifølge det tyske patent 22 19 504 som be-står av en trinnrekkefølge P-D-P kan det opptre betraktelige korrosjonsproblemer. With the method according to the German patent 22 19 504, which consists of a sequence of steps P-D-P, considerable corrosion problems can occur.
Oppfinnelsen vedrører en fremgangsmåte for helbleking av cellulose i flere trinn med alkaliske peroksyd- og sure klorittoppløsninger etter en eventuell forbehandling med magnesiumsalter og/eller organiske kompleksdannere, idet fremgangsmåten er karakterisert ved at den minst er tretrinnet, idet cellulosen i første trinn blekes med perfor-bindelsene, i annet trinn ved en temperatur på 20-60°C med kloritt og i tredje trinn igjen med en perforbindelse, og ved at det bare vaskes med vann mellom første og annet trinn på kjent måte. The invention relates to a method for complete bleaching of cellulose in several stages with alkaline peroxide and acid chlorite solutions after any pre-treatment with magnesium salts and/or organic complexing agents, the method being characterized by the fact that it is at least three-stage, the cellulose being bleached in the first stage with perfor- the bonds, in the second step at a temperature of 20-60°C with chlorite and in the third step again with a per compound, and by only washing with water between the first and second steps in a known manner.
Ved vanskelig blekbare celluloser eller for innstilling av For celluloses that are difficult to bleach or for setting of
en ønsket polymerisasjonsgrad kan det tilknyttes ytterligere kjente bleketrinn. a desired degree of polymerization, further known bleaching steps can be associated.
Slike bleketrinn er omtalt i Ullmanns Enzyklopådie der technischen Chemie, 3. opplag, 18. bind, side 778 (1967). Gjennomføringen av fremgangsmåten ifølge oppfinnelsen kan eksempelvis foregå i blekeinnretninger, slik det omtales i Ullmans Enzyklopådie der technischen Chemie, 3. opplag, Such bleaching steps are discussed in Ullmann's Enzyklopådie der technischen Chemie, 3rd edition, 18th volume, page 778 (1967). The implementation of the method according to the invention can, for example, take place in bleaching devices, as described in Ullman's Enzyklopådie der technischen Chemie, 3rd edition,
18. bind, side 755. Volume 18, page 755.
Mellom de enkelte bleketrinn kan det på kjent måte gjennom-føres en vasking med vann. I en foretrukket utførelsesform av oppfinnelsen kan det imidlertid mellom annet og tredje trinn utelates en vasking uten at det kan fastslås en ulempe for produktets kvalitet. Between the individual bleaching steps, washing with water can be carried out in a known manner. In a preferred embodiment of the invention, however, washing can be omitted between the second and third steps without a disadvantage for the product's quality being determined.
Fremgangsmåten ifølge oppfinnelsen kan anvendes for alle kjente cellulosetyper. Slike celluloser kan være vilkårlige nåletre- eller løvtre-sulfit-celluloser som f.eks. grantre-sulfit-cellulose eller bøkesulfit-cellulose. Med spesiell fordel kan fremgangsmåten ifølge oppfinnelsen anvendes til bleking av gran-, papir- og viskose-sulfit-cellulose eller bøkesulfit-kunstsilke-cellulose. Den kan imidlertid også anvendes til bleking av alle lang- og kortfibrede celluloser, som fra poppel eller bjerk. Forbehandlingen av cellulosen kan gjennomføres i vandig oppløsning med en stofftetthet fra 2- 15 vekt-% (referert til atro cellulose), fortrinnsvis fra 3- 5 vekt-%. Derved kan temperaturen utgjøre mellom 5 og 80°C, fortrinnsvis mellom 5 og 20°C. Forbehandlingens varighet kan ligge mellom 5 og 60 minutter, fortrinnsvis mellom 5 og 10 minutter. Magnesiumsaltkonsentrasjon kan utgjøre 0,05-0,6 vekt-%, fortrinnsvis 0,1-0,4 vekt-% (referert til atro cellulose og MgSO^). The method according to the invention can be used for all known cellulose types. Such celluloses can be arbitrary softwood or hardwood sulphite celluloses such as e.g. spruce sulphite cellulose or beech sulphite cellulose. With particular advantage, the method according to the invention can be used for bleaching spruce, paper and viscose sulphite cellulose or beech sulphite artificial silk cellulose. However, it can also be used for bleaching all long and short fiber celluloses, such as from poplar or birch. The pre-treatment of the cellulose can be carried out in an aqueous solution with a density of 2-15% by weight (referred to atro cellulose), preferably from 3-5% by weight. Thereby, the temperature can be between 5 and 80°C, preferably between 5 and 20°C. The duration of the pretreatment can be between 5 and 60 minutes, preferably between 5 and 10 minutes. Magnesium salt concentration may amount to 0.05-0.6% by weight, preferably 0.1-0.4% by weight (referred to atro cellulose and MgSO 4 ).
Som magnesiumsalter kan det anvendes: MgSO^, Mg C^, Mg( VlO^) ^, MgEDTA (etylendiamintetraeddiksyre) eller magnesiumsalter As magnesium salts, the following can be used: MgSO^, Mg C^, Mg(VlO^)^, MgEDTA (ethylenediaminetetraacetic acid) or magnesium salts
av polyoksykarboksylsyrer. Slike polyoksykarboksylsyrer omtales f.eks. i DOS 19 04 940, 19 04 941 og 19 42 556. of polyoxycarboxylic acids. Such polyoxycarboxylic acids are referred to e.g. in DOS 19 04 940, 19 04 941 and 19 42 556.
Konsentrasjonen av kompleksdannere i forbehandlingsbadet The concentration of complex formers in the pretreatment bath
kan utgjøre 0,005-0,6 vekt-%, fortrinnsvis 0,1-0,3 vekt-% may amount to 0.005-0.6% by weight, preferably 0.1-0.3% by weight
(referert til atro cellulose). Som kompleksdannere kan det anvendes: etylendiamineddiksyre (EDTA), Na^DTPA, polyoksykarboksylsyrer, slik de eksempelvis omtales i DOS 19 04 940, 19 04 941 eller 19 42 556. (referred to atro cellulose). As complexing agents, the following can be used: ethylenediamineacetic acid (EDTA), Na^DTPA, polyoxycarboxylic acids, as they are for example mentioned in DOS 19 04 940, 19 04 941 or 19 42 556.
Første bleketrinn kan gjennomføres med en perforbindelse med en stofftetthet fra 5-10 vekt-%, fortrinnsvis fra 8-12 vekt-% (referert til atro cellulose) i vandig oppløsning. Som perforbindelse kan det derved anvendes en organisk eller uorganisk peroksyd, som hydrogenperoksyd, natriumperoksyd eller t-butyl-hydroperoksyd. I en foretrukket utførelses-form anvendes hydrogenperoksyd. Temperaturen kan i første bleketrinn utgjøre mellom 40 og 95°C, fortrinnsvis mellom 50 og 75°C. The first bleaching step can be carried out with a compound with a material density of from 5-10% by weight, preferably from 8-12% by weight (referred to atro cellulose) in aqueous solution. An organic or inorganic peroxide, such as hydrogen peroxide, sodium peroxide or t-butyl hydroperoxide, can thereby be used as per compound. In a preferred embodiment, hydrogen peroxide is used. In the first bleaching stage, the temperature can be between 40 and 95°C, preferably between 50 and 75°C.
Varigheten av første trinn kan utgjøre mellom 30 og 240 minutter, fortrinnsvis mellom 60 og 80 minutter. The duration of the first step can be between 30 and 240 minutes, preferably between 60 and 80 minutes.
Konsentrasjonen av perforbindelser kan utgjøre fra 0,5-5 vekt-%, fortrinnsvis fra 0,8-1,2 vekt-% (referert til atro cellulose og 100% H202). The concentration of per compounds can be from 0.5-5% by weight, preferably from 0.8-1.2% by weight (referred to atro cellulose and 100% H 2 O 2 ).
Konsentrasjonen av alkali, fortrinnsvis natriurahydroksyd kan utgjøre 1,5-10 vekt-%, fortrinnsvis 2,0-4,0 vekt-% (referert til atro cellulose og 100% NaOH). The concentration of alkali, preferably sodium hydroxide, can amount to 1.5-10% by weight, preferably 2.0-4.0% by weight (referred to atro cellulose and 100% NaOH).
I annet trinn kan det i den vandige oppløsning som kloritt In the second step, it can in the aqueous solution as chlorite
anvendes et alkalikloritt, fortrinnsvisnatriumkloritt. Stoff-tettheten av annet trinn kan utgjøre 5-15 vekt-%, fortrinnsvis 8-12 vekt-% (referert til atro cellulose). Temperaturen kan være 20-80°C, fortrinnsvis 25-60°C. Varigheten av annet trinn kan ligge mellom 30 og 240 minutter, fortrinnsvis mellom 60 og 180 minutter. Konsentrasjonen av alkalikloritt kan utgjøre 0,05-1,0 vekt-%, fortrinnsvis 0,1-0,3 vekt-% an alkali chlorite is used, preferably sodium chlorite. The substance density of the second stage can amount to 5-15% by weight, preferably 8-12% by weight (referred to atro cellulose). The temperature can be 20-80°C, preferably 25-60°C. The duration of the second step can be between 30 and 240 minutes, preferably between 60 and 180 minutes. The concentration of alkali chlorite can amount to 0.05-1.0% by weight, preferably 0.1-0.3% by weight
(referert til atro cellulose og 100% natriumkloritt). (referred to atro cellulose and 100% sodium chlorite).
Annet trinns pH-verdi kan utgjøre 2,5-5,0, fortrinnsvis 3,0-4. pH-verdien kan innstilles ved tilsetning av en organisk syre, f.eks. maursyre eller eddiksyre eller en mineralsyre. I en foretrukket utførelsesform anvendes sal-petersyre (HNO-j). The pH value of the second step can be 2.5-5.0, preferably 3.0-4. The pH value can be adjusted by adding an organic acid, e.g. formic or acetic acid or a mineral acid. In a preferred embodiment, nitric acid (HNO-j) is used.
Tredje bleketrinn kan gjennomføres med en perforbindelse i vandig oppløsning ved en stofftetthet fra 5-15 vekt-%, fortrinnsvis 8-12 vekt-% (referert til atro cellulose). Som perforbindelse kan det anvendes uorganiske eller organiske peroksyder som f.eks. hydrogenperoksyd, natriumperoksyd eller t-butyl-hydroperoksyd. Fortrinnsvis kan det anvendes hydrogenperoksyd som perforbindelse. Temperaturen kan ut-gjøre 40-95°C, fortrinnsvis 50-65°C. Varigheten av tredje bleketrinn kan utgjøre 30-240 minutter, fortrinnsvis 60-120 minutter. Konsentrasjonen av perforbindelse, fortrinnsvis hydrogenperoksyd, kan utgjøre 0,2-2,0 vekt-%, fortrinnsvis 0,4-0,8 vekt-% (referert til atro cellulose og 100% H2°2*" Konsentrasjonen av alkali kan utgjøre 0,5-3,0 vekt-%, fortrinnsvis 0,8-1,2 vekt-% (referert til atro cellulose og 100% NaOH). Som alkali anvendes fortrinnsvis natriumhydrok-syd. The third bleaching step can be carried out with a percompound in aqueous solution at a material density of 5-15% by weight, preferably 8-12% by weight (referred to atro cellulose). Inorganic or organic peroxides such as e.g. hydrogen peroxide, sodium peroxide or t-butyl hydroperoxide. Preferably, hydrogen peroxide can be used as per compound. The temperature can be 40-95°C, preferably 50-65°C. The duration of the third bleaching step can be 30-240 minutes, preferably 60-120 minutes. The concentration of per compound, preferably hydrogen peroxide, may amount to 0.2-2.0% by weight, preferably 0.4-0.8% by weight (referred to atro cellulose and 100% H2°2*" The concentration of alkali may amount to 0 .5-3.0% by weight, preferably 0.8-1.2% by weight (referred to atro cellulose and 100% NaOH). The alkali used is preferably sodium hydroxide.
Fremgangsmåten ifølge oppfinnelsen har den fordel at ved kombinasjon og rekkefølge av bleketrinnene perforbindelse, kloritt og perforbindelse, samt ved føring av kloritt-bleke-trinnet ved en pH-verdi mellom 3 og 5 er det mulig å holde anvendelsesmengden av kloritt så liten at det ikke kommer nevneverdige mengder av klor i avvannsystemet. Det vil si at fremgangsmåten ifølge oppfinnelsen arbeider omtrent klorfritt. The method according to the invention has the advantage that by combining and sequencing the bleaching steps per compound, chlorite and per compound, as well as by conducting the chlorite-bleaching step at a pH value between 3 and 5, it is possible to keep the amount of chlorite used so small that it does not significant amounts of chlorine enter the waste water system. That is to say, the method according to the invention works almost chlorine-free.
Sluttproduktets hvithetsinnhold er forbedret i henhold til sluttproduktet fra kjente fremgangsmåter, idet i tillegg kan dessuten utbyttet økes rundt 2-3%. The final product's whiteness content is improved in accordance with the final product from known methods, as the yield can also be increased by around 2-3%.
Videre kan vaskingen mellom annet og tredje bleketrinn bort-falle, hvorved det oppnås en forbedret varmeøkonomi. Furthermore, the washing between the second and third bleaching stage can be omitted, whereby an improved heat economy is achieved.
Temperaturen i annet trinn kan senkes.inntil 20°C, idet The temperature in the second stage can be lowered to 20°C, as
det bevirkes en betraktelig redusering av korrosjonsprob-lemene som f.eks. kan opptre ved fremgangsmåten ifølge tysk patent 22 19 504 i klordioksydtrinnet (D). there is a considerable reduction in corrosion problems such as e.g. can occur in the process according to German patent 22 19 504 in the chlorine dioxide step (D).
Fremgangsmåten ifølge oppfinnelsen skal forklares nærmere ved hjelp av noen eksempler. The method according to the invention will be explained in more detail with the help of some examples.
Eksemp_el_l Example_el_l
Bleking av bøkesulfit-kunstsilke-cellulose i henhold til teknikkens stand Bleaching of beech sulphite-artificial silk-cellulose according to the state of the art
Eksemrj§l_2 Eczema_2
Bleking av bøkesulfitt-kunstsilke-cellulose ifølge oppfinnelsen: Resultater Bleaching of beech sulphite-artificial silk-cellulose according to the invention: Results
De to eksempler viser for en bøkesulfit-kunstsilke-cellulose at med fremgangsmåten ifølge oppfinnelsen oppnås en bedre bleking. Det 3,3% høyere celluloseutbytte fåes ved omtrent uendret a-celluloseinnhold. Den bare svakt nedsatte R 19-verdi viser at utbyttegevinsten ved mask-alkalisering og viskosefremstilling bibeholdes sterkt. Den høyere viskosi-tet viser at fremgangsmåten forløper meget fiberskånende. The two examples show for a beech sulphite artificial silk cellulose that with the method according to the invention better bleaching is achieved. The 3.3% higher cellulose yield is obtained with an approximately unchanged α-cellulose content. The only slightly reduced R 19 value shows that the yield gain from mask alkalization and viscose production is strongly maintained. The higher viscosity shows that the process is very fiber-friendly.
Den samlede kloranvendelse ved den kjente blekefremgangsmåte i henhold til eks. 1 var referert til cellulose 2,6%, ved blekingen ifølge oppfinnelsen 0,06%, The overall use of chlorine in the known bleaching method according to e.g. 1 was referred to cellulose 2.6%, in the bleaching according to the invention 0.06%,
Eksempel_3 Example_3
Bleking av en gran-sulfit-cellulose i henhold til teknikkens stand. Bleaching of a spruce sulphite cellulose according to the state of the art.
Eksemgel_4 Eczema gel_4
Bleking av en gran-sulfit-cellulose for papir ifølge oppfinnelsen. Resultater Bleaching of a spruce sulphite cellulose for paper according to the invention. Results
Ved svakt høyere hvithetsinnhold og noe bedre utbytte reduseres klorinnholdet i avvann ved fremgangsmåten ifølge oppfinnelsen fra 6%, referert til anvendt cellulose til 0,16%. With a slightly higher whiteness content and somewhat better yield, the chlorine content in waste water is reduced by the method according to the invention from 6%, referred to the cellulose used, to 0.16%.
Eksemp_el_5 Example_el_5
Bleking av en gran-sulfit-cellulose ifølge oppfinnelsen. Bleaching of a spruce sulphite cellulose according to the invention.
0,3% MgS04 10 min. 5% stofftetthet 15°C. 0.3% MgSO4 10 min. 5% fabric density 15°C.
Fortykning til 10% stofftetthet. Thickening to 10% fabric density.
Det blekede stoff oppnådde 91,0% hvithetsinnhold. The bleached fabric achieved 91.0% whiteness content.
Ved forbehandlingen med MgSO^ kunne peroksydanvendelsen i første trinn reduseres til 1,3% t^C^ • During the pretreatment with MgSO^, the peroxide use in the first stage could be reduced to 1.3% t^C^ •
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2841013A DE2841013C2 (en) | 1978-09-21 | 1978-09-21 | Process for full bleaching of pulp |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO792067L NO792067L (en) | 1980-03-24 |
| NO153342B true NO153342B (en) | 1985-11-18 |
| NO153342C NO153342C (en) | 1986-02-26 |
Family
ID=6049994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO792067A NO153342C (en) | 1978-09-21 | 1979-06-20 | PROCEDURE FOR CELLULOSIZING CELLULOSE. |
Country Status (11)
| Country | Link |
|---|---|
| AT (1) | AT372426B (en) |
| BE (1) | BE878841A (en) |
| BR (1) | BR7905860A (en) |
| CA (1) | CA1122358A (en) |
| CH (1) | CH641515A5 (en) |
| DE (1) | DE2841013C2 (en) |
| FI (1) | FI68681C (en) |
| FR (1) | FR2436846A1 (en) |
| IT (1) | IT1119314B (en) |
| NO (1) | NO153342C (en) |
| SE (1) | SE445366B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3937932A1 (en) * | 1989-11-15 | 1991-05-16 | Holtzmann & Cie Ag E | Delignification and bleaching of pulp with alkali chlorite - by adding chlorite before acidification to produce nascent reagent, minimising pollution |
| US5607546A (en) * | 1990-02-13 | 1997-03-04 | Molnlycke Ab | CTMP-process |
| SE466060C (en) | 1990-02-13 | 1995-07-11 | Moelnlycke Ab | Absorbent chemitermomechanical mass and preparation thereof |
| AU642971B2 (en) * | 1990-02-19 | 1993-11-04 | Paper Australia Pty Ltd | Bleaching of paper pulp |
| NZ237019A (en) * | 1990-02-19 | 1992-11-25 | Amcor Ltd | Bleaching paper pulp by initially treating with oxygen and/or hydrogen peroxide and subsequently treating with a bleaching agent without intervening washing steps |
| US6398908B1 (en) | 1991-04-30 | 2002-06-04 | Eka Nobel Ab | Process for acid bleaching of lignocellulose-containing pulp with a magnesium compound |
| SE500353C2 (en) * | 1992-10-26 | 1994-06-06 | Sca Wifsta Oestrand Ab | Peroxide bleaching of sulfate pulp with the addition of magnesium before bleaching |
| SE9203366L (en) * | 1992-11-11 | 1994-05-12 | Mo Och Domsjoe Ab | Process for delignification and / or bleaching of cellulose pulp |
| SE501325E (en) * | 1993-01-29 | 1999-06-09 | Kvaerner Pulping Tech | Process for chlorine-free bleaching of pulp, wherein the pulp is acidified with acetic acid in the treatment with complexing agents |
| SE502706E (en) * | 1994-04-05 | 1999-06-18 | Mo Och Domsjoe Ab | Preparation of bleached cellulose pulp by bleaching with chlorine dioxide and treatment of complexing agents in the same step |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE582239C (en) * | 1929-03-16 | 1933-09-14 | I G Farbenindustrie Akt Ges | Process for bleaching bast fibers, in particular linen and hemp, in the form of yarns and fabrics as well as in the form of raw fibers using superoxide and hypochlorite balls |
| FR1010501A (en) * | 1948-08-31 | 1952-06-12 | Papiers Abadie Sa Des | Cellulose pulp bleaching process |
| SE335053B (en) * | 1969-05-13 | 1971-05-10 | Mo Och Domsjoe Ab | |
| DE2219504C2 (en) * | 1972-04-21 | 1974-10-03 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt | Multi-stage bleaching of cellulose with significantly reduced use of chlorine |
| DE2327900C3 (en) * | 1973-06-01 | 1985-02-07 | Degussa Ag, 6000 Frankfurt | Bleaching of cellulose with considerably reduced use of chlorine |
| DE2721402C2 (en) * | 1977-05-12 | 1984-04-12 | Degussa Ag, 6000 Frankfurt | Process for bleaching pulp |
-
1978
- 1978-09-21 DE DE2841013A patent/DE2841013C2/en not_active Expired
-
1979
- 1979-06-20 NO NO792067A patent/NO153342C/en unknown
- 1979-06-29 IT IT68380/79A patent/IT1119314B/en active
- 1979-07-04 FI FI792115A patent/FI68681C/en not_active IP Right Cessation
- 1979-07-10 FR FR7917876A patent/FR2436846A1/en active Granted
- 1979-09-11 CA CA335,412A patent/CA1122358A/en not_active Expired
- 1979-09-13 BR BR7905860A patent/BR7905860A/en unknown
- 1979-09-17 BE BE6/46946A patent/BE878841A/en not_active IP Right Cessation
- 1979-09-20 AT AT0620579A patent/AT372426B/en not_active IP Right Cessation
- 1979-09-20 CH CH849479A patent/CH641515A5/en not_active IP Right Cessation
- 1979-09-21 SE SE7907850A patent/SE445366B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| BR7905860A (en) | 1980-05-20 |
| FI68681B (en) | 1985-06-28 |
| FI792115A (en) | 1980-03-22 |
| IT1119314B (en) | 1986-03-10 |
| FR2436846A1 (en) | 1980-04-18 |
| DE2841013C2 (en) | 1984-06-07 |
| SE445366B (en) | 1986-06-16 |
| FI68681C (en) | 1985-10-10 |
| NO153342C (en) | 1986-02-26 |
| CH641515A5 (en) | 1984-02-29 |
| BE878841A (en) | 1980-03-17 |
| IT7968380A0 (en) | 1979-06-29 |
| NO792067L (en) | 1980-03-24 |
| ATA620579A (en) | 1983-02-15 |
| SE7907850L (en) | 1980-03-22 |
| AT372426B (en) | 1983-10-10 |
| DE2841013A1 (en) | 1980-04-03 |
| CA1122358A (en) | 1982-04-27 |
| FR2436846B1 (en) | 1982-08-27 |
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