FI76135C - FOERFARANDE FOER BLEKNING AV PAPPERSMASSOR MED VAETEPEROXID. - Google Patents
FOERFARANDE FOER BLEKNING AV PAPPERSMASSOR MED VAETEPEROXID. Download PDFInfo
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- FI76135C FI76135C FI845121A FI845121A FI76135C FI 76135 C FI76135 C FI 76135C FI 845121 A FI845121 A FI 845121A FI 845121 A FI845121 A FI 845121A FI 76135 C FI76135 C FI 76135C
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- hydrogen peroxide
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 18
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000008139 complexing agent Substances 0.000 claims abstract description 7
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims abstract description 6
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 6
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical group [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- 150000001450 anions Chemical class 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims 1
- 239000001110 calcium chloride Substances 0.000 claims 1
- 229910001628 calcium chloride Inorganic materials 0.000 claims 1
- 238000009897 hydrogen peroxide bleaching Methods 0.000 claims 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 21
- 238000004061 bleaching Methods 0.000 abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052681 coesite Inorganic materials 0.000 abstract description 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 229910052682 stishovite Inorganic materials 0.000 abstract description 2
- 229910052905 tridymite Inorganic materials 0.000 abstract description 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 15
- 239000007844 bleaching agent Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 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
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005325 percolation Methods 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000004155 Chlorine dioxide Substances 0.000 description 1
- 241000218631 Coniferophyta Species 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
- 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
- 229910019093 NaOCl Inorganic materials 0.000 description 1
- 229920000388 Polyphosphate Polymers 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- HJMZMZRCABDKKV-UHFFFAOYSA-N carbonocyanidic acid Chemical compound OC(=O)C#N HJMZMZRCABDKKV-UHFFFAOYSA-N 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 150000001804 chlorine Chemical class 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 235000019398 chlorine dioxide Nutrition 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 235000011180 diphosphates Nutrition 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229960003330 pentetic acid Drugs 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- 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)
- Detergent Compositions (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
- Load-Bearing And Curtain Walls (AREA)
Abstract
Description
761 35761 35
Menetelmä paperimassojen valkaisemiseksi vetyperoksidin avullaMethod for bleaching pulps with hydrogen peroxide
Kyseessä oleva keksintö koskee menetelmää, jonka avulla voidaan valkaista kemiallisia paperimassoja vetyperoksidin avulla.The present invention relates to a process for bleaching chemical pulps with hydrogen peroxide.
Kemiallisten paperimassojen valkaiseminen, so. valkaisemattomien selluloosamassojen, jotka on saatu keittämällä ligno-selluloosa-aineita ns. sulfiitti-, sulfaatti- tai Kraft-menetel-män mukaan natriumhydroksidin tai -karbonaatin kanssa, suoritetaan teollisuudessa tavallisesti kloorin tai kloorijohdannaisten avulla, jotka ovat kuten kloori luonteeltaan hapettavia, kuten klooridioksidi CIC^ tai natriumhypokloriitti NaOCl.Bleaching of chemical pulps, i.e. unbleached cellulose pulps obtained by cooking ligno-cellulosic substances so-called according to the sulphite, sulphate or Kraft process with sodium hydroxide or carbonate, is usually carried out in industry by means of chlorine or chlorine derivatives which are oxidizing in nature, such as chlorine dioxide CIC2 or sodium hypochlorite NaOCl.
Mikään näistä hapettavista aineista ei kuitenkaan pysty yksinään takaamaan tyydyttävää valkaisua yhdessä ainoassa operaatiossa. On suoritettava useita erillisiä vaiheita ja välivaiheita kuten erikoisesti ns. alkaliliuoksessa uuttaminen. Tällaisista peräkkäisistä vaiheista peräisin olevat laskuvedet ovat hyvin voimakkaasti värjäytyneitä, saastuttavia ja syövyttäviä. Ne voivat jopa aiheuttaa räjähdysvaaran reagoivien aineiden sykliin palautuksen aikana. Ne sisältävät erikoisesti huomattavia määriä orgaanisia klooripitoisia aineita ja kloridi-ioneja. Tästä johtuen niitä ei voida heittää pois eikä palauttaa takaisin sykliin ilman monimutkaisia ja kalliita käsittelyjä.However, none of these oxidizing agents alone can guarantee satisfactory bleaching in a single operation. Several separate steps and intermediate steps have to be performed, such as the so-called extraction in alkaline solution. The low tide from such successive stages is very strongly discolored, polluting, and corrosive. They can even pose a risk of explosion during the return of reactants to the cycle. They contain particularly significant amounts of organic chlorine-containing substances and chloride ions. As a result, they cannot be thrown away or returned to the cycle without complicated and expensive treatments.
Mainittujen epäkohtien korjaamiseksi on harkittu ei-kloorattu-jen hapettavien aineiden käyttämistä, nimenomaan hapen tai vetyperoksidin. Hapen käyttö, jossa on pakko työskennellä paineen alaisena ja suurin kustannuksin, on saavuttanut vain rajoitetun käytön teollisuudessa.To remedy these drawbacks, the use of non-chlorinated oxidizing agents, namely oxygen or hydrogen peroxide, has been considered. The use of oxygen, which is forced to work under pressure and at high cost, has achieved only limited use in industry.
Vetyperoksidia voidaan käyttää atmosfäärin paineessa tavanmukaisissa valkaisulaitteissa. Kuitenkaan sen käytön avulla 761 35 2 suoraan valkaisemattomiin massoihin, joiden kappaindeksi on suunnilleen 30, ei ole voitu saada sellaisia käsiteltyjä massoja, joiden kappaindeksi olisi suunnilleen alle 20-25. Lisä-vaiheen avulla, jossa näitä massoja esikäsitellään happamassa väliaineessa, ja joka on vireillä olevien hakemusten kohteena, voidaan parantaa näitä tuloksia, mutta kaikissa tunnetuissa valkaisumenetelmissä, jotka perustuvat vuorotteleviin happaman liuoksen ja emäksisen liuoksen vaiheisiin, ei voida välttää probleemeja jotka syntyvät käytettyjen liuosten poisheittämisestä tai uudelleen sykliin palauttamisesta eikä saavuttaa alhaisia kappa-arvoja käsitellyille massoille.Hydrogen peroxide can be used at atmospheric pressure in conventional bleaching equipment. However, by using it 761 35 2 directly on unbleached pulps with a kappa index of approximately 30, it has not been possible to obtain treated pulps with a kappa index of approximately less than 20-25. An additional step of pretreating these pulps in an acidic medium, which is the subject of pending applications, can improve these results, but in all known bleaching methods based on alternating steps of acidic solution and basic solution, problems arising from discarding or re-cycling and does not achieve low kappa values for the treated masses.
Keksinnön mukaisen menetelmän avulla voidaan saada valkaistuja selluloosapaperimassoja, joiden kappaindeksi on alle 10 ja samalla sellaisia laskuvesiä, jotka voidaan suoraan paLauttaa sykliin valkaisumenetelmään.By means of the process according to the invention, bleached cellulosic pulps with a kappa index of less than 10 can be obtained, and at the same time such trough waters can be directly returned to the cycle in the bleaching process.
Menetelmä käsittää sen, että valkaisemattomia selluloosapaperimassoja käsitellään vetyperoksidin avulla, yhdessä ainoassa vaiheessa, lämpötilavälillä 70-100°C valkaisuliuoksen avulla, jonka pH pidetään välillä 11-11,5 ja vetyperoksidin lisäksi käytetään ainakin yhtä alkalista ainetta joksi voidaan valita joko natriumhydroksidi tai natriumkarbonaatti, ainakin yhtä alkalimetallisilikaattia, jonka konsentraatio ilmoitettuna piidioksidina S1O2 on ainakin 0,3 paino-%, ainakin yhtä magne-siumsuolaa ja ainakin yhtä kalsiumsuolaa sellainen määrä, että kummankin maa-alkalialkuaineen konsentraatio on välillä 0,05-1 paino-%, ja nämä pidetään liuenneina ainakin yhden maa-alkali-ioneja kompleksoivan aineen avulla, ja kompleksia muodostavan aineen kokonaiskonsentraatio ei ylitä 10 paino-%.The method comprises treating unbleached cellulosic pulps with hydrogen peroxide, in a single step, at a temperature in the range of 70-100 ° C with a bleaching solution maintained at a pH between 11-11.5 and using at least one alkaline substance selected from hydrogen peroxide, either sodium hydroxide or sodium carbonate, at least one alkali metal silicate having a concentration, expressed as silica, of S1O2 of at least 0.3% by weight, at least one magnesium salt and at least one calcium salt in an amount such that the concentration of each alkaline earth element is between 0.05 and 1% by weight, and these are considered dissolved with at least one alkaline earth ion complexing agent, and the total concentration of the complexing agent does not exceed 10% by weight.
Vetyperoksidin konsentraatio valkaisuliuoksessa on sama kuin teollisuudessa yleisesti hyväksytty. Se ei tavallisesti ylitä 1 paino-% ja se on tavallisimmin välillä 0,02-0,5 %.The concentration of hydrogen peroxide in the bleach solution is the same as generally accepted in the industry. It usually does not exceed 1% by weight and is usually between 0.02 and 0.5%.
Alkalimetallisilikaatin konsentraatio painoprosenteissa, il maistuna SiO^ina, valitaan taloudellisista syistä alle 20 %:ksi ja se on tavallisimmin alle 5 %.The concentration of alkali metal silicate by weight, expressed as SiO 2, is chosen for economic reasons to be less than 20% and is usually less than 5%.
3 761353 76135
Parhaiten soveltuvia kalsiumsuoloja ja magnesiumsuoloja ovat ne, joiden anioni on mahdollisimman inertti vetyperoksidiin nähden keksinnön mukaisen menetelmän suorittamisolosuhteissa, kuten esimerkiksi kloridit.The most suitable calcium salts and magnesium salts are those whose anion is as inert as possible to hydrogen peroxide under the conditions for carrying out the process according to the invention, such as chlorides.
Magnesium- ja kalsiumioneja kompleksoiva aine tai aineet valitaan esimerkiksi alkalimetallipolyfosfaateista ja -pyrofosfaa-teista, typpeä sisältävistä hapoista kuten etyleenidiamiini-tetraetikkahappo, dietyleenitriamiinipentaetikkahappo ja nitrilo-etikkahappo, tai niiden suoloista, monomeerisistä tai polymeerisistä fosforihapoista, polyelektrolyyteistä kuten poly-a-hydroksiakryylihappo ja vastaava laktoni.The magnesium and calcium ion complexing agent or agents are selected, for example, from alkali metal polyphosphates and pyrophosphates, nitrogen-containing acids such as ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid and polyylacetic acid and nitriloacetic acid, or salts thereof, monomeric, monomeric .
Natriumhydroksidia ja natriumkarbonaattia pidetään muita aikalisiä aineita parempina taloudellisista syistä.Sodium hydroxide and sodium carbonate are considered superior to other temporal substances for economic reasons.
Kun keksinnön mukainen menetelmä suoritetaan alle 70°C lämpötilassa, on saatu valkaisu erinomainen, mutta sen saavuttamiseen vaaditaan reaktioaikojaf jotka tulevat nopeasti haitallisiksi.When the process according to the invention is carried out at a temperature below 70 ° C, the bleaching obtained is excellent, but reaction times are required to achieve it, which quickly become harmful.
Kun keksinnön mukainen menetelmä suoritetaan yli 100°C lämpötilassa, tulee vetyperoksidin hajoaminen nopeasti häiritseväksi. Parhaana pidetty lämpötilaväli on 85-95°C.When the process according to the invention is carried out at a temperature above 100 ° C, the decomposition of hydrogen peroxide rapidly becomes disturbing. The preferred temperature range is 85-95 ° C.
Jotta valkaisuliuoksen koostumus olisi tyydyttävä, pidetään parhaana suorittaa vesiväliaineessa olevien kalsium- ja magnesium-suolojen liuottaminen siten, että läsnä on maa-alkali-ioneja kompleksoivaa ainetta tai aineita ja lisätä sitten näin saatuun liuokseen alkalimetallisilikaattia konsentroidun vesiliuoksen muodossa, sitten vetyperoksidin liuos ennen kuin seoksen pH säädetään arvoon välille 11-11,5 natriumhydroksidin tai -karbonaatin avulla.In order to obtain a satisfactory composition of the bleaching solution, it is preferable to dissolve the calcium and magnesium salts in the aqueous medium in the presence of alkaline earth ionizing agent or agents and then add alkali metal silicate in the form of a concentrated aqueous solution, then hydrogen peroxide solution. adjusted to a value between 11 and 11.5 by means of sodium hydroxide or carbonate.
4 761 354,761 35
Kontakti valkaistavan massan ja tähän tarkoitukseen muodostetun liuoksen kanssa, mihin kuluva aika voi vaihdella riippuen erikoisesti lämpötilasta, mutta ei kuitenkaan tavallisesti ylitä kymmentä tuntia, tapahtuu joko ei-jatkuvana tai jatkuvana siten, että valkaisuliuos johdetaan kiinteän faasin läpi, joka muodostuu selluloosa-aineesta tai siten, että tämä liuos sekoitetaan hyvin tämän kiinteän faasin kanssa.Contact with the pulp to be bleached and the solution formed for this purpose, which may vary depending in particular on temperature, but usually does not exceed ten hours, takes place either non-continuously or continuously by passing the bleach solution through a solid phase of cellulosic material or that this solution is mixed well with this solid phase.
Ensimmäisessä tapauksessa, eli perkolaatiotekniikassa voi paino-suhde valkaisuliuos/kiinteä aine olla välillä 10-100 ja mieluummin välillä 15-50. Toisessa tapauksessa tämä suhde voi olla välillä 4-100 ja mieluummin välillä 8-20.In the first case, i.e. in the percolation technique, the weight ratio of bleach solution / solid may be between 10-100 and preferably between 15-50. In the second case, this ratio may be between 4-100 and preferably between 8-20.
Seuraavat esimerkit, jotka on annettu ei-rajoittavassa mielessä, valaisevat keksinnön mukaista menetelmää:The following examples, given in a non-limiting sense, illustrate the method of the invention:
Esimerkki 1 20 g valkaisematonta massaa, joka on peräisin havupuun Kraft-kei-tosta ja jonka kappaindeksi on 30, käsitellään perkolaation avulla lämpötilassa 90°C 8 h ajan 500 g:n avulla valkaisuliuos-ta, jonka pH pidetään vakiona arvossa 11-11,5 lisäämällä nat-riumhydroksidia ja joka kiertää suljetussa piirissä nopeudella 300 ml/h, vetyperoksidipitoisuus pidetään vakiona lisäämällä tätä reagoivaa ainetta, ja liuos sisältää paino-osissa: natriumsilikaattia (ilmoitettuna Na20,3,36 Si02) 1,7 % kalsiumia (CaCl2:n muodossa) 0,3 % magnesiumia (MgCl2:n muodossa) 0,15 % natriumtripolyfosfaattia 0,6 % natriumhydroksidia 0,4 % vetyperoksidia, 100-prosenttista 0,34 % Käsittelyn jälkeen on massan kappaindeksi vain 8 ja tämän saavuttamiseksi kulutetun vetyperoksidin määrä ei edusta kuin 4 paino-% käytetystä massasta.Example 1 20 g of unbleached pulp from conifer Kraft soup with a kappa index of 30 are treated by percolation at 90 ° C for 8 h with 500 g of a bleaching solution having a constant pH of 11-11, 5 by the addition of sodium hydroxide and circulating in a closed circuit at a rate of 300 ml / h, the hydrogen peroxide concentration is kept constant by the addition of this reactant and the solution contains in parts by weight: sodium silicate (expressed as Na 2 O, 3,36 SiO 2) 1.7% calcium (CaCl 2 0.3% magnesium (in the form of MgCl2) 0.15% sodium tripolyphosphate 0.6% sodium hydroxide 0.4% hydrogen peroxide, 100% 0.34% After treatment, the mass has a kappa index of only 8 and the amount of hydrogen peroxide consumed to achieve this is not. represent than 4% by weight of the pulp used.
5 761355 76135
Esimerkki 2Example 2
Työskennellään kuten esimerkissä 1 ja valkaisuliuoksena on sama, jota on käytetty käsittelemään esimerkin 1 valkaisemattoman massan panos; käsitellään toinen valkaisemattoman massan panos ja sitten kolmas. Tämän kolmannen operaation jälkeen todetaan, että valkaisuliuos on säilyttänyt koko tehokkuutensa, koska käsitellyn massan kappaindeksi on 8 ja kulutettu vetyperoksidi ei ole kuin 4,1 paino-% laskettuna käytetyn massan painosta.Work as in Example 1 and the bleach solution is the same as that used to treat the batch of unbleached pulp of Example 1; the second batch of unbleached pulp is treated and then the third. After this third operation, it is found that the bleaching solution has retained its full effectiveness, since the kappa index of the treated pulp is 8 and the hydrogen peroxide consumed is not more than 4.1% by weight based on the weight of the pulp used.
Esimerkki 3 10 g samaa alkuperää olevaa valkaisematonta massaa, jonka kappa-indeksi on sama kuin esimerkissä 1, sekoitetaan 100 g:n kanssa liuosta, jolla on sama painokoostumus kuin esimerkissä 1. Seosta pidetään 90°C:ssa 10 h ajan ja lisätään 5 h kuluttua 0,34 g vetyperoksidia.Example 3 10 g of unbleached pulp of the same origin with the same kappa index as in Example 1 are mixed with 100 g of a solution having the same weight composition as in Example 1. The mixture is kept at 90 ° C for 10 h and added for 5 h. after 0.34 g of hydrogen peroxide.
Käsittelyn jälkeen on massan kappaindeksi = 8 ja tämän tuloksen saavuttamiseen tarvitun vetyperoksidin kulutus ei ole kuin 4,3 paino-% laskettuna käytetystä massasta.After treatment, the mass has a kappa index = 8 and the consumption of hydrogen peroxide required to achieve this result is not more than 4.3% by weight, based on the mass used.
Analoginen tulos saavutetaan kun työskennellään samassa lämpötilassa kuin edellä mutta jatkuvana lisäämällä valkaistavaa massaa ja poistamalla ekvivalentti määrä valkaistua massaa ja ottamalla takaisin sykliin valkaisuliuosta, joka on erotettu poistetusta massasta ja jonka vetyperoksidin tiitteri on säädetty uudelleen samoin kuin muilla valkaisuliuoksen aineosiin kuuluvilla aineilla siten, että käsittelyalueella vallitsevat muuttumattomat olosuhteet ja että kontakti tapahtuu 8 h aikana massan ja valkaisuliuoksen välillä.An analogous result is obtained by working at the same temperature as above but continuously by adding the pulp to be bleached and removing an equivalent amount of bleached pulp and re-cycling the bleach solution separated from the removed pulp and readjusted to the hydrogen peroxide titre as with other bleach solution components, unchanged conditions and that contact takes place within 8 h between the pulp and the bleach solution.
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8320990 | 1983-12-29 | ||
| FR8320990A FR2557605B1 (en) | 1983-12-29 | 1983-12-29 | PROCESS FOR BLEACHING PAPER PULP BY HYDROGEN PEROXIDE |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| FI845121A0 FI845121A0 (en) | 1984-12-27 |
| FI845121L FI845121L (en) | 1985-06-30 |
| FI76135B FI76135B (en) | 1988-05-31 |
| FI76135C true FI76135C (en) | 1992-04-15 |
Family
ID=9295687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI845121A FI76135C (en) | 1983-12-29 | 1984-12-27 | FOERFARANDE FOER BLEKNING AV PAPPERSMASSOR MED VAETEPEROXID. |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0148712B1 (en) |
| JP (1) | JPS60181391A (en) |
| AT (1) | ATE29537T1 (en) |
| AU (1) | AU567787B2 (en) |
| CA (1) | CA1262805A (en) |
| DE (2) | DE3466024D1 (en) |
| ES (1) | ES539151A0 (en) |
| FI (1) | FI76135C (en) |
| FR (1) | FR2557605B1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3544398A1 (en) * | 1985-12-16 | 1987-06-19 | Sueddeutsche Kalkstickstoff | METHOD FOR THE BLEACHING AND DELIGNIFICATION OF CELLULAR-BASED PRODUCTS |
| JPH0642046B2 (en) * | 1987-01-29 | 1994-06-01 | 新王子製紙株式会社 | Support for photographic paper |
| SE470065C (en) * | 1991-04-30 | 1996-01-15 | Eka Nobel Ab | Treatment of chemical pulp with an acid and then a magnesium and calcium compound in chlorine-free bleaching |
| DE69420306T2 (en) * | 1993-04-20 | 2000-04-20 | Eka Chemicals Ab | Process for bleaching lignocellulosic pulp |
| IT1290070B1 (en) * | 1997-03-13 | 1998-10-19 | 3V Sigma Spa | COMPOSITIONS FOR THE PAPER WHITENING |
| GB2327894A (en) * | 1997-08-01 | 1999-02-10 | Nippon Paint Co Ltd | Method of multi-layer coating formation |
| EP1088130B1 (en) * | 1998-05-15 | 2004-03-31 | National Silicates Partnership | Peroxide, oxygen, and peroxide/oxygen brightening of chemical and mixed waste pulps |
| US6699358B1 (en) | 1998-05-15 | 2004-03-02 | National Silicates Partnership | Method for brightening chemical pulp with hydrogen peroxide using a magnesium compound in silicate solution |
| US7001484B2 (en) | 2000-05-04 | 2006-02-21 | University Of New Brunswick | Peroxide bleaching of wood pulp using stabilizers and sodium hydrosulfide reducing agent |
| US8845860B2 (en) | 2010-09-16 | 2014-09-30 | Georgia-Pacific Consumer Products Lp | High brightness pulps from lignin rich waste papers |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US437813A (en) * | 1890-10-07 | Envelope-machine | ||
| NL97796C (en) * | 1958-05-29 | |||
| US3472813A (en) * | 1967-01-18 | 1969-10-14 | Argus Chem | Resistance of acrylonitrile butadiene styrene polymers to discoloration |
| FR2038056A1 (en) * | 1969-03-07 | 1971-01-08 | Air Liquide | Stable, clear bleaching bath for paper - pulp |
| SE7510015L (en) * | 1975-09-09 | 1977-03-10 | Dev Ab Sca | WAY TO TREAT LIGNOCELLULOSIS-CONTAINING MATERIAL |
| JPS583074B2 (en) * | 1975-11-17 | 1983-01-19 | 三菱瓦斯化学株式会社 | Palpuno Kasan Kabutsu Hiyou Hakuhou |
| JPS5927436B2 (en) * | 1979-05-29 | 1984-07-05 | 王子製紙株式会社 | Peroxide bleaching method for wood pulp |
| FR2476684A1 (en) * | 1980-02-21 | 1981-08-28 | Interox | PROCESS FOR INHIBITING CORROSION OF TITANIUM APPLIANCES |
-
1983
- 1983-12-29 FR FR8320990A patent/FR2557605B1/en not_active Expired
-
1984
- 1984-12-21 DE DE8484420215T patent/DE3466024D1/en not_active Expired
- 1984-12-21 AT AT84420215T patent/ATE29537T1/en not_active IP Right Cessation
- 1984-12-21 EP EP84420215A patent/EP0148712B1/en not_active Expired
- 1984-12-21 DE DE198484420215T patent/DE148712T1/en active Pending
- 1984-12-27 JP JP59274194A patent/JPS60181391A/en active Granted
- 1984-12-27 FI FI845121A patent/FI76135C/en not_active IP Right Cessation
- 1984-12-28 AU AU37243/84A patent/AU567787B2/en not_active Ceased
- 1984-12-28 ES ES539151A patent/ES539151A0/en active Granted
- 1984-12-28 CA CA000471164A patent/CA1262805A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE148712T1 (en) | 1986-01-02 |
| FI845121A0 (en) | 1984-12-27 |
| AU567787B2 (en) | 1987-12-03 |
| FI845121L (en) | 1985-06-30 |
| JPS6261716B2 (en) | 1987-12-23 |
| EP0148712A1 (en) | 1985-07-17 |
| ATE29537T1 (en) | 1987-09-15 |
| FR2557605B1 (en) | 1987-12-11 |
| EP0148712B1 (en) | 1987-09-09 |
| AU3724384A (en) | 1985-07-04 |
| ES8602173A1 (en) | 1985-11-16 |
| DE3466024D1 (en) | 1987-10-15 |
| ES539151A0 (en) | 1985-11-16 |
| CA1262805A (en) | 1989-11-14 |
| JPS60181391A (en) | 1985-09-17 |
| FR2557605A1 (en) | 1985-07-05 |
| FI76135B (en) | 1988-05-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM | Patent lapsed |
Owner name: ATOCHEM |