NO127410B - - Google Patents
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- NO127410B NO127410B NO02322/70A NO232270A NO127410B NO 127410 B NO127410 B NO 127410B NO 02322/70 A NO02322/70 A NO 02322/70A NO 232270 A NO232270 A NO 232270A NO 127410 B NO127410 B NO 127410B
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- Prior art keywords
- pulp
- ozone
- peroxide
- bleaching
- oven
- Prior art date
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 34
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 29
- 239000000835 fiber Substances 0.000 claims description 27
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 229920001131 Pulp (paper) Polymers 0.000 claims description 20
- 238000004061 bleaching Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 15
- 150000002978 peroxides Chemical class 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- -1 peroxide compound Chemical class 0.000 claims description 10
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- 239000008246 gaseous mixture Substances 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 8
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 7
- 230000032683 aging Effects 0.000 description 6
- 229920002678 cellulose Polymers 0.000 description 6
- 239000001913 cellulose Substances 0.000 description 6
- 230000001143 conditioned effect Effects 0.000 description 5
- 239000004857 Balsam Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 235000007173 Abies balsamea Nutrition 0.000 description 3
- 244000018716 Impatiens biflora Species 0.000 description 3
- 241000218657 Picea Species 0.000 description 3
- 239000007844 bleaching agent Substances 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- GRWZHXKQBITJKP-UHFFFAOYSA-N dithionous acid Chemical class OS(=O)S(O)=O GRWZHXKQBITJKP-UHFFFAOYSA-N 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 238000006385 ozonation reaction Methods 0.000 description 2
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 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
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- 239000012969 di-tertiary-butyl peroxide Substances 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000004045 organic chlorine compounds Chemical class 0.000 description 1
- 150000001451 organic peroxides Chemical class 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
- OVARTBFNCCXQKS-UHFFFAOYSA-N propan-2-one;hydrate Chemical compound O.CC(C)=O OVARTBFNCCXQKS-UHFFFAOYSA-N 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000004383 yellowing Methods 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
- D21C9/1073—Bleaching ; Apparatus therefor with O3
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Detergent Compositions (AREA)
Description
Fremgangsmåte for bleking av mekanisk masse. Process for bleaching mechanical pulp.
Den foreliggende oppfinnelse vedrører en fremgangsmåte for bleking av mekanisk masse med en konsistens på 15-60$ ved å behandle massen med en gassformet blanding av ozon-oksygen eller ozon-luft. The present invention relates to a method for bleaching mechanical pulp with a consistency of 15-60$ by treating the pulp with a gaseous mixture of ozone-oxygen or ozone-air.
Ved den vanlige bleking av mekanisk masse bevirkes blekingen for å avfarge massen uten å gjøre dens inneholdte lignin oppløs- In the usual bleaching of mechanical pulp, the bleaching is effected to decolorize the pulp without dissolving its contained lignin.
bar. For å oppnå slik bleking benyttes to klasser av blekekjemi-kalier, nemlig reduksjonsmidler og oksydasjonsmidler. bar. To achieve such bleaching, two classes of bleaching chemicals are used, namely reducing agents and oxidizing agents.
De vanligst benyttete reduksjonsmidler er hydrosulfiter. Bleking, gjennomføres i den vandige fase ved 3 til H% konsistens The most commonly used reducing agents are hydrosulphites. Bleaching is carried out in the aqueous phase at 3 to H% consistency
ved en pH fra 4,5 til 6,0 ved en temperatur på omtrent 60°C.med en oppholdstid på en time. Vanligvis er det også klorforbin-delser eller beskyttelsesmidler til stede. at a pH from 4.5 to 6.0 at a temperature of approximately 60°C. with a residence time of one hour. Usually chlorine compounds or protective agents are also present.
De vanligst benyttete oksydasjonsmidler for bleking av mekanisk masse er peroksyder som, i motsetning til hydrosulfiter,.med-fører en alkalisk pH, en relativt høy massekonsistens på fra 15 The most commonly used oxidizing agents for bleaching mechanical pulp are peroxides which, in contrast to hydrosulphites, bring with them an alkaline pH, a relatively high pulp consistency of from 15
til 25%, moderate temperaturer på omtrent 60°C og en oppholdstid på to til tre timer. Videre er det ved slik bleking med peroksyd nødvendig å benytte stabilisatorer, for'eksempel natriumsilikat og magne si ums ul fat, i blékévæsken for å hindre spalting av denne.... Ytterligere blir - den mekaniske masse vanligvis behandlet ,på'forhånd ved en lav konsistens med organiske klorforbindelser, for eksempel natrium-dietylentriamin-pentaacetat (DPTA), for å fjerne naturlig forekommende spor av metaller i de mekaniske masser. to 25%, moderate temperatures of approximately 60°C and a residence time of two to three hours. Furthermore, with such bleaching with peroxide, it is necessary to use stabilizers, for example sodium silicate and magne si ums ul fat, in the bleaching liquid to prevent splitting of this....Furthermore, the mechanical pulp is usually treated, in advance, by a low consistency with organic chlorine compounds, for example sodium diethylenetriamine pentaacetate (DPTA), to remove naturally occurring traces of metals in the mechanical masses.
Det er også blitt, foreslått (se kanadisk patentskrift It has also been suggested (see Canadian patent document
769.631) å bleke cellulose eller celluloseholdige blandinger ved å tilsette ozon til blandingen av hypokloritt og/eller underklorsyr-ling og/eller kloroppløsning som inneholder fri klor, som benyttes som blekemiddel, og cellulosen som skal blekes. Selv om hypoklo-ritter er blitt foreslått for bleking av mekaniske masser er det funnet at det kreves store mengder hypokloritt og dessuten at hypokloritt angriper ligninet' og karbohydratet- i den mekaniske -masse'-,', hvilket bevirker et betydelig tap i utbyttet av bleket masse. 769,631) to bleach cellulose or cellulose-containing mixtures by adding ozone to the mixture of hypochlorite and/or hypochlorous acid and/or chlorine solution containing free chlorine, which is used as a bleaching agent, and the cellulose to be bleached. Although hypochlorites have been proposed for bleaching mechanical pulps, it has been found that large amounts of hypochlorite are required and furthermore that hypochlorite attacks the lignin' and the carbohydrate in the mechanical pulp',' causing a significant loss in the yield of bleached mass.
Fra US-patentskrift 3.451.888 er det kjent å bleke masse for papirfremstilling i form av en vandig oppslemming med en konsistens på 30 — 65% ved å lede en gasstrøm som inneholder ozon og har- et fuktighetsinnhold på nær 100% gjennom massen. From US patent 3,451,888 it is known to bleach pulp for papermaking in the form of an aqueous slurry with a consistency of 30 - 65% by passing a gas stream containing ozone and having a moisture content of close to 100% through the pulp.
Det er allerede blitt foreslått, såsom i US-patentskrift 2.466.633 at fibrert kjemisk masse som inneholder fra 45 til 75% fuktighet kan blekes ved å behandle den med luft som inneholder 0,5% ozon ved en pH på 5 til 6 ved værelsestemperatur.. It has already been suggested, such as in US Patent 2,466,633, that fibrous chemical pulp containing from 45 to 75% moisture can be bleached by treating it with air containing 0.5% ozone at a pH of 5 to 6 at room temperature ..
Det er imidlertid også kjent (se Scoteland og Kringstad: However, it is also known (see Scotland and Kringstad:
"Norsk Skogindustri" utgave 2, side 59 og 51, 1968) at forsøk på "Norsk Skogindustri" issue 2, pages 59 and 51, 1968) that attempts to
å utvide denne behandling til blekingen av mekanisk masse ikke har vært fullstendig vellykket.' Når ozon føres inn i en oppløsning av mekanisk masse eller når ozoniseringen utføres med et tørrstoff-innhold i området fra 30 til 40%, vil således den mekaniske masse bli gulere og få lavere lyshet enn den ubehandlete masse. For å redusere dette tap i lyshet er det blitt foreslått at den mekaniske masse-enten blir redusert véd preacetylering, eller at;.reaksjonen med ozon blir utført med massen i et aceton-vann-medium. Dessuten er det blitt funnet at forsøkene på å oppnå en mer bestemt ozonise*-ring, det vil si å heve lysheten i massen og å fjerne gulningsef-' to extend this treatment to the bleaching of mechanical pulp has not been entirely successful.' When ozone is introduced into a solution of mechanical pulp or when the ozonization is carried out with a dry matter content in the range from 30 to 40%, the mechanical pulp will thus become yellower and have a lower brightness than the untreated pulp. In order to reduce this loss in brightness, it has been proposed that the mechanical mass is either reduced by preacetylation, or that the reaction with ozone is carried out with the mass in an acetone-water medium. Moreover, it has been found that the attempts to achieve a more definite ozonization*-ring, that is, to raise the lightness of the pulp and to remove the yellowing effect-'
fekten utén preacetylering av massen ikke har vært heldige. the fence without preacetylation of the mass have not been lucky.
Et hovedformål med denne oppfinnelse er a frembringe en fremgangsmåte for bleking av en mekanisk masse med ozon hvorved lysheten og/eller styrkeegenskapene til massen forbedres. A main purpose of this invention is to produce a method for bleaching a mechanical pulp with ozone, whereby the lightness and/or strength properties of the pulp are improved.
Den foreliggende oppfinnelse kjennetegnes ved at blekingen ut-føres etterat det i massen er innført en peroksyd-forbindelse inneholdende en peroksyd-ekvivalent på 0,025 - 1% regnet på basis av ovnstørket masse, idet blekingen finner sted ved en temperatur på 20-80°C i en periode på 1 .- 60 minutter ved en pH-verdi på 3,5 - The present invention is characterized by the fact that the bleaching is carried out after a peroxide compound containing a peroxide equivalent of 0.025 - 1% calculated on the basis of oven-dried pulp has been introduced into the pulp, the bleaching taking place at a temperature of 20-80°C for a period of 1 .- 60 minutes at a pH value of 3.5 -
11,5 inntil omtrent 1% ozon regnet på basis av ovnstørket masse er blitt innført i massen. 11.5 until approximately 1% ozone calculated on the basis of oven-dried pulp has been introduced into the pulp.
Ifølge et trekk ved'den foreliggende oppfinnelse kan fremgangsmåten utføres'ved å findele massen før ozonbehandlingen slik at den omdannes til fiber og fiberaggregater med en konsistens på According to a feature of the present invention, the method can be carried out by comminuting the mass before the ozone treatment so that it is converted into fiber and fiber aggregates with a consistency of
fra 15 til 60 vektsprosent' fast masse. from 15 to 60 percent by weight of solid mass.
Peroksydforbindelsen kan således tilsettes enten under eller etter findelingen av massen. Det vesentlige trekk ved oppfinnelsen er at blekingen med ozon finner sted i nærvær av peroksydforbindelsen mens massen er i form av fiber og fiberaggregater. Med andre ord kan peroksydforbindelsen tilsettes den ublekete mekaniske masse, enten forut for findeling eller under findelingen, for eksempel ved å sprøyte en oppløsning av peroksydforbindelsen på fibrene og- fiberaggregatene. Den findelte masse i form av fiber og fiberaggregater føres deretter inn i en reaktor hvori den behandles med den ozoninneholdende gass i et tidsrom på fra ltil 60 minutter og ved en pH-verdi fra 3,5 til 11,5. The peroxide compound can thus be added either during or after the pulp is finely divided. The essential feature of the invention is that the bleaching with ozone takes place in the presence of the peroxide compound while the mass is in the form of fibers and fiber aggregates. In other words, the peroxide compound can be added to the unbleached mechanical pulp, either prior to comminution or during comminution, for example by spraying a solution of the peroxide compound onto the fibers and fiber aggregates. The finely divided pulp in the form of fiber and fiber aggregates is then fed into a reactor in which it is treated with the ozone-containing gas for a period of from 1 to 60 minutes and at a pH value from 3.5 to 11.5.
Peroksydforbindelsen kan være et uorganisk peroksyd, herun- The peroxide compound can be an inorganic peroxide, including
der hydrogenperoksyd og natriumperoksyd eiler organisk peroksyd som omfatter benzoylperoksyd eller ditertiærbuty1-peroksyd. wherein hydrogen peroxide and sodium peroxide are organic peroxides comprising benzoyl peroxide or di-tertiary butyl peroxide.
Ozonet kan fremstilles i konsentrasjoner fra omtrent H vektsprosent på basis av 0^/ 0^ ved benyttelse av en kommersiell ozon-fremstiller for laboratoriebruk, eller kan erholdes på trykktanker. The ozone can be produced in concentrations from approximately H percent by weight on a 0^/0^ basis using a commercial ozone producer for laboratory use, or can be obtained from pressure tanks.
Det er også blitt funnet at forbedringen i styrkeegenskapene til den mekaniske masse er en funksjon av berøringstiden og pH-verdien når en konstant fast dosering av ozon (basert på ovnstør- It has also been found that the improvement in the strength properties of the mechanical pulp is a function of the contact time and the pH value when a constant fixed dosage of ozone (based on
ket masse) tilføres til massen. ket mass) is added to the mass.
Fremgangsmåten ifølge den foreliggende oppfinnelse har flere fordeler i forhold til kjente fremgangsmåter som omfatter anven-delse av enten ozon alene eller peroksyd alene. Det er blitt ut-ført forsøk som omfatter ingen behandling, behandling med hydrogenperoksyd alene, med hydrogenperoksyd og oksygen sammen, med hydrogenperoksyd og' luft sammen og med hydrogenperoksyd og 1%. ozon sammen.■Resultatene viser at sprengfaktoren for masse som er behandlet med hydrogenperoksyd alene, med hydrogenperoksyd og oksygen og med hydrogenperoksyd og luft er den samme som sprengfaktoren for ubehandlet masse. Etter behandling med hydrogenperoksyd <q>g ozon er sprengfaktoren 39% høyere .enn etter behandling med hydrogenperok- The method according to the present invention has several advantages compared to known methods which include the use of either ozone alone or peroxide alone. Experiments have been carried out which include no treatment, treatment with hydrogen peroxide alone, with hydrogen peroxide and oxygen together, with hydrogen peroxide and air together and with hydrogen peroxide and 1%. ozone together.■The results show that the blast factor for pulp treated with hydrogen peroxide alone, with hydrogen peroxide and oxygen and with hydrogen peroxide and air is the same as the blast factor for untreated pulp. After treatment with hydrogen peroxide <q>g ozone, the explosion factor is 39% higher than after treatment with hydrogen peroxide
syd og luft. Videre er lysheten ved de andre behandlingsmetoder stort sett som for•ubehandlet masse,.mens lysheten. for masse som er behandlet.med hydrogenperoksyd og.ozon er omtrent 10% høyere enn for masse som er behandlet med hydrogenperoksyd og luft. Videre oppnås det ved fremgangsmåten ifølge•oppfinnelsen øket bruddlengde. south and air. Furthermore, the lightness of the other treatment methods is largely the same as untreated pulp, while the lightness of for pulp treated with hydrogen peroxide and ozone is approximately 10% higher than for pulp treated with hydrogen peroxide and air. Furthermore, the method according to the invention results in an increased breaking length.
Betegnelsen "fiber og fiberaggregater" er blitt benyttet- The term "fiber and fiber aggregates" has been used-
foran. Dette uttrykk omfatter;opprevet mekanisk cellulosemasse (noen ganger kalt fibrert mekanisk cellulosemasse). som er det produkt som fåes ved oppdeling av en mekanisk cellulosemas-se i fiber og fiberaggregater eller fnokker. Hvert enke.lt . fiber eller fiber-fnokk er ■ svamp akt ig, sammenpressbart og lett .gj ennomt rengelig .for gass. Fibrene og. fiberaggregatene har vanligvis, en gjennomsnitt- in front of. This term includes; shredded mechanical cellulose pulp (sometimes called fibrous mechanical cellulose pulp). which is the product obtained by dividing a mechanical cellulose pulp into fibers and fiber aggregates or strands. Each one . fiber or fiber fluff is ■ spongy, compressible and easy to clean, even for gas. The fibers and. the fiber aggregates usually have an average
lig størrelse på omtrent.6,5 - 25,4 mm- i diameter og oppviser et opprevet, tørt utseende selv-med omtrent 40 til 85 vektsprosent fuktighet i massen. En foretrukket måte til å fibrere den. mekaniske masse for å frembringe det- beskrevne produkt er angitt i kanadisk patentskrift, nr. 869.267.... equal size of about 6.5 - 25.4 mm- in diameter and exhibit a torn, dry appearance even with about 40 to 85 weight percent moisture in the pulp. A preferred way to fiber it. mechanical mass to produce the product described is set forth in Canadian patent document, No. 869,267....
I en ut førelses form kan den mekaniske masse behandles med en oksydoppløsning av uorganisk eller organisk natur, deretter findeles eller rives som beskrevet, i nevnte patentskrift og endelig behandles me.d en ozoninneholdende gass. Den resulterende, oksyderte masse vil da ha nådd en egnet lyshet.med forbedrete styrkeegenskaper. In one embodiment, the mechanical pulp can be treated with an oxide solution of an inorganic or organic nature, then crushed or shredded as described in the aforementioned patent and finally treated with an ozone-containing gas. The resulting oxidized mass will then have reached a suitable lightness with improved strength properties.
De følgende sammenliknende eksempler viser at uventete fordeler kan oppnås ved hjelp av fremgangsmåten ifølge oppfinnelsen. The following comparative examples show that unexpected advantages can be achieved by means of the method according to the invention.
Eksempel I. Example I.
En handelsvanlig spruce-balsam-mekanisk masse, med'lyshet A commercially available spruce balsam mechanical pulp, with lightness
57,3, ble presset til en konsistens på 35%. Den pressete masse ble besprøytet med en oppløsning som inneholdt hydrogenperoksyd (0,2% t^C^bas.ert på ovnstørket masse), natriumsilikat (2,5% Na2SiO^ basert på ovnstørket masse), natriumhydroksyd (1% NaOH basert på ovnstørket masse), magnesiumsulfat (0,05% MgSO^ på basis av ovns-tørket . masse ) og tilstrekkelig vann til å redusere massen til. en 57.3, was pressed to a consistency of 35%. The pressed pulp was sprayed with a solution containing hydrogen peroxide (0.2% t^C^ based on oven-dried pulp), sodium silicate (2.5% Na2SiO^ based on oven-dried pulp), sodium hydroxide (1% NaOH based on oven-dried pulp), magnesium sulfate (0.05% MgSO^ on the basis of oven-dried . pulp ) and sufficient water to reduce the pulp to. one
konsistens på. 30%. Massen ble deretter findelt i fibre og fiberaggregater. a) En del av den peroksydbehandlete masse ble anbragt i. et kar som ble satt i efbad og temperaturen ble holdt på 40°C i 2 timer. consistency on. 30%. The pulp was then finely divided into fibers and fiber aggregates. a) Part of the peroxide-treated mass was placed in a vessel which was placed in a water bath and the temperature was kept at 40°C for 2 hours.
Den endelige pH-verdi i massen var 10,9. En porsjon av den blekete masse ble vasket og lufttørket og lysheten målt. Lyshets-prøvene ble deretter plassert i en sirkulerende varmluftsovn med 105°C i en time, deretter behandlet i en konstant atmosfære til en relativ fuktighet på 50% ved 21,1°C. Lysheten og lyshetstapet ble målt igjen etter aldring og massens, styrkeegenskaper ble undersøkt på standardhåndarkprøver som angitt i tabell I. The final pH value in the pulp was 10.9. A portion of the bleached pulp was washed and air-dried and the lightness measured. The brightness samples were then placed in a circulating hot air oven at 105°C for one hour, then treated in a constant atmosphere to a relative humidity of 50% at 21.1°C. The brightness and brightness loss were measured again after aging and the mass, strength properties were examined on standard hand sheet samples as indicated in Table I.
b) En porsjon av den peroksydbehandlete masse ble anbrakt i et roterende kar som ble plassert i et bad og temperaturen ble holdt b) A portion of the peroxide-treated pulp was placed in a rotating vessel which was placed in a bath and the temperature was maintained
ved 40°C. En gassformet ozon-oksygen-blanding ble ført inn i det roterende kar slik at i løpet' av 5 minutter ble 1,0% ozon basert på ovnstørket masse ført inn i karet. pH-verdien til den fuktige, findelte masse var 10,5. En porsjon av den blekete masse ble vasket og lufttørket og lysheten ble målt. Lyshets-prøvene ble deretter anbrakt i en sirkulerende varmluftovn ved 105°C i 1 time, deretter kondisjonert i en konstant atmosfære til en relativ fuktighet på 50% ved 21,1°C. Lysheten og lyshetstapet ble målt igjen etter aldring og massens styrkeegenskaper ble undersøkt på standardhåndarkprøver som angitt i tabell I. at 40°C. A gaseous ozone-oxygen mixture was introduced into the rotating vessel so that within 5 minutes 1.0% ozone based on oven-dried mass was introduced into the vessel. The pH value of the moist, finely divided pulp was 10.5. A portion of the bleached pulp was washed and air dried and the brightness was measured. The brightness samples were then placed in a circulating hot air oven at 105°C for 1 hour, then conditioned in a constant atmosphere to a relative humidity of 50% at 21.1°C. The lightness and loss of lightness were measured again after aging and the strength properties of the pulp were examined on standard hand sheet samples as indicated in Table I.
c) En porsjon av den peroksydbehandlete masse ble anbrakt i et roterende kar som ble plassert i et bad hvor temperaturen ble c) A portion of the peroxide-treated pulp was placed in a rotating vessel which was placed in a bath where the temperature was
holdt ved 40°C. En gassformet ozon-oksygen-blanding ble ført inn i det roterende kar slik at i løpet av 30 minutter ble til-ført 1% ozon basert på ovnstørket masse til karet. pH-verdien til den fuktige, findelte masse var 10,3. En porsjon av den blekete masse ble vasket og lufttørket og lysheten målt. Lyshets-prøvene ble deretter plassert i en sirkulerende varmluftovn ved 105°C i 1 time, og deretter kondisjonert i en konstant atmosfære til en relativ fuktighet på 50% ved 21,1°C. Lysheten og lyshetstapet ble målt etter aldring og massens styrkeegenskaper ble undersøkt på standardhåndarkprøver som angitt i tabell I. kept at 40°C. A gaseous ozone-oxygen mixture was introduced into the rotating vessel so that within 30 minutes 1% ozone based on oven-dried pulp was added to the vessel. The pH value of the moist, finely divided pulp was 10.3. A portion of the bleached pulp was washed and air-dried and the lightness measured. The brightness samples were then placed in a circulating hot air oven at 105°C for 1 hour, and then conditioned in a constant atmosphere to a relative humidity of 50% at 21.1°C. The lightness and loss of lightness were measured after aging and the strength properties of the pulp were examined on standard hand sheet samples as indicated in Table I.
d) En handelsvanlig spruce-balsam-mekanisk masse med lyshet 57 } 3 ble presset til 35% konsistens. Den pressete masse ble besprøy-tet med en oppløsning som inneholdt natriumhydroksyd (1,5% NaOH basert på ovnstørket masse) og tilstrekkelig vann til å redusere mas'sens konsistens til 30%. Massen ble deretter findelt til fibre og fiberaggregater. d) A commercially available spruce balsam mechanical pulp with lightness 57 } 3 was pressed to 35% consistency. The pressed pulp was sprayed with a solution containing sodium hydroxide (1.5% NaOH based on oven-dried pulp) and sufficient water to reduce the consistency of the pulp to 30%. The pulp was then finely divided into fibers and fiber aggregates.
Den opprevne masse ble deretter anbrakt i et roterende kar som ble plassert i et bad hvor temperaturen ble holdt ved <i>)0°C. En gassformet ozon-oksygen-blanding ble ført inn i karet slik' at det i løpet av 30 minutter ble ført inn 1% ozon basert på ovnstørket mas se.nH-verdien til den fuktige, findelte masse var 10,0. Massen b^e deretter vasket, lufttørket og lysheten målt. Lysheten er angitt i tabell I. The shredded pulp was then placed in a rotating vessel which was placed in a bath where the temperature was maintained at <i>)0°C. A gaseous ozone-oxygen mixture was introduced into the vessel so that within 30 minutes 1% ozone was introduced based on the oven-dried pulp. The nH value of the moist, finely divided pulp was 10.0. The pulp was then washed, air-dried and the lightness measured. The brightness is given in Table I.
Eksempel II. Example II.
En handelsvanlig spruce-balsam-mekanisk masse, med lyshet 57,3 ble press.et til en konsistens på 35%. Den pressete masse ble besprøytet med en oppløsning som inneholdt hydrogenperoksyd (0-,2% ^ 2^ 2 basert På ovnstørket masse), natriumsilikat (0,5% NaSiO basert på ovnstørket masse), natriumhydroksyd (0,25% NaOH basert på ovnstørket masse og magnesiumsulfat (0,05% MgSO^ basert på ovns--, tørket masse.) samt tilstrekkelig vann til å redusere massens konsistens til 30%. Massen ble-deretter findelt til fibre og fiberaggregater. A commercially available spruce-balsam mechanical pulp, with lightness 57.3, was pressed to a consistency of 35%. The pressed pulp was sprayed with a solution containing hydrogen peroxide (0-.2% ^ 2^ 2 based on oven-dried pulp), sodium silicate (0.5% NaSiO based on oven-dried pulp), sodium hydroxide (0.25% NaOH based on oven-dried pulp and magnesium sulfate (0.05% MgSO^ based on oven-dried pulp) as well as sufficient water to reduce the consistency of the pulp to 30% The pulp was then finely divided into fibers and fiber aggregates.
a) En porsjon av den- peroksydbehandlete masse ble anbrakt i et kar som ble plassert i et bad hvor temperature-n ble holdt ve-d a) A portion of the peroxide-treated pulp was placed in a vessel which was placed in a bath where the temperature was maintained at
40°C i 2 timer. Den endelige pH-verdi :til massen var 3-8. En porsjon, av den blekete masse ble vasket og lufttørket og lysheten målt. Lyshetsprøvene ble deretter plassert i en sirkulerende, varmluftovn ved 105°C i 1 time, deretter kondisjonert i en. atmosfære til en relativ fuktighet på 50% ved 21,1°C. Lysheten og lyshetstapet ble målt etter aldring, og massens styrkeegenskaper ble undersøkt på standardhåndarkprøver som angitt i tabell I. 40°C for 2 hours. The final pH value of the pulp was 3-8. A portion of the bleached mass was washed and air-dried and the lightness measured. The brightness samples were then placed in a circulating hot air oven at 105°C for 1 hour, then conditioned in a. atmosphere to a relative humidity of 50% at 21.1°C. The lightness and lightness loss were measured after ageing, and the strength properties of the pulp were examined on standard hand sheet samples as indicated in Table I.
b) En porsjon av den peroksydbehandlete masse ble anbrakt i et. roterende kar som ble plassert i et bad hvor temperaturen ble b) A portion of the peroxide-treated pulp was placed in a rotating vessel which was placed in a bath where the temperature was
holdt ved i)0°C. En gassformet ozon-oksygen-blanding ble ført inn i det roterende kar.slik at det i løpet av 5 minutter ble tilført karet 1,0% ozon basert på ovnstørket masse. pH-verdien til den fuktige, findelte masse var 3,6. En porsjon av den blekete masse ble vasket og lufttørket og lysheten målt. Lyshets-prøvene ble deretter plassert i en sirkulerende varmluftovn kept at i)0°C. A gaseous ozone-oxygen mixture was introduced into the rotating vessel, so that within 5 minutes 1.0% ozone based on oven-dried mass was added to the vessel. The pH value of the moist, finely divided pulp was 3.6. A portion of the bleached pulp was washed and air-dried and the lightness measured. The brightness samples were then placed in a circulating hot air oven
ved 105°C i en time, deretter kondisjonert i en konstant atmos- at 105°C for one hour, then conditioned in a constant atmos-
fære til en relativ fuktighet på 50% ved 21,1°C. Lysheten og lyshetstapet ble målt etter aldring og massens styrkeegenskaper ble undersøkt på standardhåndarkprøver. bring to a relative humidity of 50% at 21.1°C. The lightness and lightness loss were measured after aging and the strength properties of the pulp were examined on standard hand sheet samples.
c) En porsjon av den peroksydbehandlete masse ble anbrakt i et roterende kar som ble plassert i et bad hvor temperaturen ble c) A portion of the peroxide-treated pulp was placed in a rotating vessel which was placed in a bath where the temperature was
holdt på 40°C. En gassformet ozon-oksygen-blanding ble ført inn i det roterende kar slik at det i løpet av 30° minutter ble ført inn i karet 1% ozon basert på ovnstørket masse. pH-verdien til den fuktige, findelte masse var 3 >5• En porsjon av den blekete masse ble vasket og lufttørket og lysheten målt. Lyshetsprøvene ble deretter'plassert i en sirkulerende varmluftovn ved en temperatur på 105°C i en time, deretter kondisjonert i en konstant atmosfære til en relativ fuktighet på 50% ved 21,1°C. Lysheten og lyshetstapet ble målt etter aldring og massens styrkeegenskaper ble undersøkt på standardhåndarkprøver som angitt i tabell I. held at 40°C. A gaseous ozone-oxygen mixture was introduced into the rotating vessel so that 1% ozone based on oven-dried pulp was introduced into the vessel within 30° minutes. The pH value of the moist, finely divided pulp was 3 >5• A portion of the bleached pulp was washed and air-dried and the brightness measured. The brightness samples were then placed in a circulating hot air oven at a temperature of 105°C for one hour, then conditioned in a constant atmosphere to a relative humidity of 50% at 21.1°C. The lightness and loss of lightness were measured after aging and the strength properties of the pulp were examined on standard hand sheet samples as indicated in Table I.
d) En handels vanlig spruce-balsam mekanisk masse med lyshet '57,3, ble presset til en konsistens på 50% og deretter findelt til'd) A commercially available spruce balsam mechanical pulp of lightness '57.3, was pressed to a consistency of 50% and then finely divided to'
fiber og fiberaggregater. Den opprevne masse ble deretter anbrakt i et roterende kar som ble plassert i et bad hvor temperaturen ble holdt på 40°C. En gassformet, ozon-oksygen-blanding ble ført inn !i karet slik . at det i løpet av. 30 minutter ble ført inn i karet 1% ozon basert på ovnstørket 'masse. pH-verdien til den fuktige, findelte masse var '4,1. Massen ble der-' etter vasket, lufttørket og lysheten .målt. Lysheten er angitt, i tabell I. fiber and fiber aggregates. The shredded mass was then placed in a rotating vessel which was placed in a bath where the temperature was maintained at 40°C. A gaseous ozone-oxygen mixture was introduced into the vessel as follows. that during the. For 30 minutes, 1% ozone based on oven-dried pulp was introduced into the tub. The pH value of the moist, finely divided pulp was 4.1. The mass was then washed, air-dried and the lightness measured. The brightness is indicated in Table I.
Den uventete synergistiske effekt på lysheten fremgår klart ved sammenlikning av lysheten til masse bleket med hydrogenperoksyd alene, med ozon alene og med kombinasjon av peroksydforbindelsen og ozon. The unexpected synergistic effect on lightness is clearly evident when comparing the lightness of pulp bleached with hydrogen peroxide alone, with ozone alone and with a combination of the peroxide compound and ozone.
De foranstående eksempler kan gjentas med liknende hell ved The preceding examples can be repeated with similar success by
å benytte de generelt og spesielt angitte reaksjonsdeltakere og driftsbetingelser ifølge oppfinnelsen istedenfor de som er benyt-tet i eksemplene. to use the generally and specifically specified reaction participants and operating conditions according to the invention instead of those used in the examples.
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CA68520 | 1969-11-27 |
Publications (1)
Publication Number | Publication Date |
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NO127410B true NO127410B (en) | 1973-06-18 |
Family
ID=4085994
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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NO02322/70A NO127410B (en) | 1969-11-27 | 1970-06-16 |
Country Status (9)
Country | Link |
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US (1) | US3663357A (en) |
AT (1) | AT302012B (en) |
CA (1) | CA902861A (en) |
DE (1) | DE2058232C3 (en) |
FI (1) | FI50552C (en) |
FR (1) | FR2056606A5 (en) |
GB (1) | GB1274615A (en) |
NO (1) | NO127410B (en) |
SE (1) | SE354492B (en) |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7208092A (en) * | 1972-06-14 | 1973-12-18 | ||
FR2255418B1 (en) * | 1973-12-21 | 1976-05-07 | Europeen Cellulose | |
US4080249A (en) | 1976-06-02 | 1978-03-21 | International Paper Company | Delignification and bleaching of a lignocellulosic pulp slurry with ozone |
US4216054A (en) | 1977-09-26 | 1980-08-05 | Weyerhaeuser Company | Low-consistency ozone delignification |
US4372812A (en) * | 1978-04-07 | 1983-02-08 | International Paper Company | Chlorine free process for bleaching lignocellulosic pulp |
US4410397A (en) * | 1978-04-07 | 1983-10-18 | International Paper Company | Delignification and bleaching process and solution for lignocellulosic pulp with peroxide in the presence of metal additives |
TR22594A (en) * | 1987-04-07 | 1987-12-15 | Nur Emaye San Ve Tic Tic A S | STOVE PIPE EXTENSION APPARATUS |
US5409570A (en) * | 1989-02-15 | 1995-04-25 | Union Camp Patent Holding, Inc. | Process for ozone bleaching of oxygen delignified pulp while conveying the pulp through a reaction zone |
US5181989A (en) * | 1990-10-26 | 1993-01-26 | Union Camp Patent Holdings, Inc. | Reactor for bleaching high consistency pulp with ozone |
US5211811A (en) * | 1989-02-15 | 1993-05-18 | Union Camp Patent Holding, Inc. | Process for high consistency oxygen delignification of alkaline treated pulp followed by ozone delignification |
US5188708A (en) * | 1989-02-15 | 1993-02-23 | Union Camp Patent Holding, Inc. | Process for high consistency oxygen delignification followed by ozone relignification |
US5472572A (en) * | 1990-10-26 | 1995-12-05 | Union Camp Patent Holding, Inc. | Reactor for bleaching high consistency pulp with ozone |
AT393701B (en) * | 1989-12-22 | 1991-12-10 | Schmidding Wilh Gmbh & Co | METHOD FOR BLEACHING CELLULOSE-CONTAINING MATERIALS, AND SYSTEM FOR CARRYING OUT THE METHOD |
US5441603A (en) * | 1990-05-17 | 1995-08-15 | Union Camp Patent Holding, Inc. | Method for chelation of pulp prior to ozone delignification |
US5164044A (en) * | 1990-05-17 | 1992-11-17 | Union Camp Patent Holding, Inc. | Environmentally improved process for bleaching lignocellulosic materials with ozone |
US5164043A (en) * | 1990-05-17 | 1992-11-17 | Union Camp Patent Holding, Inc. | Environmentally improved process for bleaching lignocellulosic materials with ozone |
US5520783A (en) * | 1990-10-26 | 1996-05-28 | Union Camp Patent Holding, Inc. | Apparatus for bleaching high consistency pulp with ozone |
US5174861A (en) * | 1990-10-26 | 1992-12-29 | Union Camp Patent Holdings, Inc. | Method of bleaching high consistency pulp with ozone |
SE468355B (en) * | 1991-04-30 | 1992-12-21 | Eka Nobel Ab | CHEMISTRY OF CHEMICAL MASS THROUGH TREATMENT WITH COMPLEX PICTURES AND OZONE |
CA2068981C (en) * | 1991-05-24 | 1996-08-27 | Michael A. Pikulin | Two stage pulp bleaching reactor |
US6231718B1 (en) | 1992-02-28 | 2001-05-15 | International Paper Company | Two phase ozone and oxygen pulp treatment |
GB9206415D0 (en) * | 1992-03-24 | 1992-05-06 | Albright & Wilson | Stabilisation of bleach liquors |
US5411635A (en) * | 1993-03-22 | 1995-05-02 | The Research Foundation Of State University Of New York | Ozone/peroxymonosulfate process for delignifying a lignocellulosic material |
EP0644965B1 (en) * | 1993-04-06 | 1998-01-21 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Bleaching recycled pulp with ozone and hydrogen peroxide |
US5464501A (en) * | 1993-04-06 | 1995-11-07 | Societe Anonyme Pour L'etude Et L'exploitation L'air Liquide, Des Procedes Georges Claude | Bleaching recycled pulp with a reductive-oxidative sequence |
US5554259A (en) * | 1993-10-01 | 1996-09-10 | Union Camp Patent Holdings, Inc. | Reduction of salt scale precipitation by control of process stream Ph and salt concentration |
JPH108092A (en) * | 1996-06-21 | 1998-01-13 | Mitsubishi Paper Mills Ltd | Stabilizer for peroxide bleaching treatment and bleaching of fibrous substance with the same |
FR2801327B1 (en) * | 1999-11-18 | 2002-07-12 | Papeteries Matussiere Forest | PROCESS FOR DEINKING, DECOLORING, SANITIZING AND BLEACHING RECOVERY PAPER |
DE102009046797A1 (en) * | 2009-11-18 | 2011-05-19 | Voith Patent Gmbh | bleaching |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2838459A (en) * | 1955-02-01 | 1958-06-10 | Pennsalt Chemicals Corp | Stabilization of solutions containing peroxygen compounds |
US2859087A (en) * | 1955-03-28 | 1958-11-04 | Du Pont | Process for bleaching webs of fibrous cellulose material with hydrogen peroxide vapor containing water vapor |
FR1441787A (en) * | 1965-04-30 | 1966-06-10 | Progil | Pulp bleaching process |
US3492199A (en) * | 1966-10-04 | 1970-01-27 | Fmc Corp | Bleaching fluffed mechanical wood pulp with hydrogen peroxide |
-
1969
- 1969-11-27 CA CA902861A patent/CA902861A/en not_active Expired
-
1970
- 1970-03-18 US US20824A patent/US3663357A/en not_active Expired - Lifetime
- 1970-06-16 NO NO02322/70A patent/NO127410B/no unknown
- 1970-06-17 GB GB29401/70A patent/GB1274615A/en not_active Expired
- 1970-06-26 FI FI701810A patent/FI50552C/en active
- 1970-07-03 SE SE09278/70A patent/SE354492B/xx unknown
- 1970-08-05 FR FR7028861A patent/FR2056606A5/fr not_active Expired
- 1970-11-26 DE DE2058232A patent/DE2058232C3/en not_active Expired
- 1970-11-26 AT AT1065470A patent/AT302012B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
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SE354492B (en) | 1973-03-12 |
FI50552C (en) | 1976-04-12 |
CA902861A (en) | 1972-06-20 |
FR2056606A5 (en) | 1971-05-14 |
DE2058232C3 (en) | 1974-10-24 |
FI50552B (en) | 1975-12-31 |
US3663357A (en) | 1972-05-16 |
AT302012B (en) | 1972-09-25 |
DE2058232A1 (en) | 1971-06-09 |
DE2058232B2 (en) | 1974-03-14 |
GB1274615A (en) | 1972-05-17 |
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