SE445366B - PROCEDURE IN MULTIPLE STEPS FOR WHICH BLELLING CELLULOSA WITH ALKALIC PEROXIDE AND ACID CHLORITE SOLUTIONS - Google Patents
PROCEDURE IN MULTIPLE STEPS FOR WHICH BLELLING CELLULOSA WITH ALKALIC PEROXIDE AND ACID CHLORITE SOLUTIONSInfo
- Publication number
- SE445366B SE445366B SE7907850A SE7907850A SE445366B SE 445366 B SE445366 B SE 445366B SE 7907850 A SE7907850 A SE 7907850A SE 7907850 A SE7907850 A SE 7907850A SE 445366 B SE445366 B SE 445366B
- Authority
- SE
- Sweden
- Prior art keywords
- concentration
- cellulose
- minutes
- process according
- weight
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 16
- 229910001919 chlorite Inorganic materials 0.000 title claims description 10
- 229910052619 chlorite group Inorganic materials 0.000 title claims description 10
- 239000002253 acid Substances 0.000 title claims description 6
- 150000002978 peroxides Chemical class 0.000 title claims description 4
- QBWCMBCROVPCKQ-UHFFFAOYSA-M chlorite Chemical compound [O-]Cl=O QBWCMBCROVPCKQ-UHFFFAOYSA-M 0.000 title 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 229920002678 cellulose Polymers 0.000 claims description 22
- 239000001913 cellulose Substances 0.000 claims description 22
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 16
- 238000004061 bleaching Methods 0.000 claims description 16
- 150000001875 compounds Chemical class 0.000 claims description 9
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 claims description 8
- 159000000003 magnesium salts Chemical class 0.000 claims description 5
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 claims description 5
- 239000008139 complexing agent Substances 0.000 claims description 4
- 229960002218 sodium chlorite Drugs 0.000 claims description 4
- -1 chlorite compound Chemical class 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 description 18
- 238000005406 washing Methods 0.000 description 10
- 239000000460 chlorine Substances 0.000 description 7
- 229910052801 chlorine Inorganic materials 0.000 description 7
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 6
- 241000294754 Macroptilium atropurpureum Species 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 229910052754 neon Inorganic materials 0.000 description 4
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 241000218657 Picea Species 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 3
- 229920002955 Art silk Polymers 0.000 description 2
- 240000005589 Calophyllum inophyllum Species 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 229910017604 nitric acid Inorganic materials 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
- 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
- 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
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 1
- 206010029412 Nightmare Diseases 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- IENXJNLJEDMNTE-UHFFFAOYSA-N acetic acid;ethane-1,2-diamine Chemical compound CC(O)=O.NCCN IENXJNLJEDMNTE-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Inorganic materials Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002351 wastewater 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
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
79o7àsoe7 Cellulosan kan förbehandlas i vattenlösning vid en materialtäthet av 2-- 15 vikt-% (hänfört till atro cellulosa), företrädesvis av 3 - 5 vikt-%. Därvid kan temperaturen uppgå till mellan 5 och 800 C, företrädesvis mellan 5 och 20° C. The cellulose can be pretreated in aqueous solution at a material density of 2-15% by weight (based on atrocellulose), preferably 3-5% by weight. The temperature can be between 5 and 800 ° C, preferably between 5 and 20 ° C.
Förbehandlingens varaktighet kan ligga mellan 5 och 60 min, företrädesvis mellan 5 och 10 min. Magnesiumsaltets koncentra- tion kan uppgå till 0,05 - 0,6 vikt-%, företrädesvis 0,1 - 0,4 vikta (hänför: till etre cellulosa och Mg S04).The duration of the pretreatment can be between 5 and 60 minutes, preferably between 5 and 10 minutes. The concentration of the magnesium salt can amount to 0.05 - 0.6% by weight, preferably 0.1 - 0.4% by weight (refer to: ether cellulose and Mg SO 4).
Såsom magnesiumsalter kan användas: MgS04,_MgCl2,, Mg(NO3)2, Mg EDTA (etylendiamintetraättiksyra) eller magnesium- salter av polyoxikarbonsyra. Sådana polyoxikarbonsyror beskri- vee exempelvis i nE-os 19 04 940, nE-os 19 04 94l een DE-OS 19 42 556.- ' Koncentrationen för komplexbildaren i förbehandlings- vätskan kan uppgå till 0,005 - 0,6 vikt-%, företrädesvis 0,1 - 0,3 vikt-% (hänfört till atro cellulosa). Såsom komplex- bildare kan användas: etylendiaminättiksyra (EDTA), Na5DTPA, polyoxikarbonsyror, sådana som exempelvis beskrives i DE-OS 19 04 940, DE-OS 19 04 941 eller DE-OS 19 42 556.As magnesium salts can be used: MgSO 4, _MgCl 2, Mg (NO 3) 2, Mg EDTA (ethylenediaminetetraacetic acid) or magnesium salts of polyoxycarboxylic acid. Such polyoxycarboxylic acids are described, for example, in nE-os 19 04 940, nE-os 19 04 94l and DE-OS 19 42 556. The concentration of the complexing agent in the pretreatment liquid may amount to 0.005 - 0.6% by weight, preferably 0.1 - 0.3% by weight (attributed to atro cellulose). As complexing agents, the following can be used: ethylenediamine acetic acid (EDTA), Na5DTPA, polyoxycarboxylic acids, such as those described, for example, in DE-OS 19 04 940, DE-OS 19 04 941 or DE-OS 19 42 556.
Det första blekningssteget kan genomföras med en per- -förening vid en materialtäthet av 5 - 10 vikt-%, företrädesvis 8 - 12 vikt-% (hänfört till atro cellulosa) i vattenlösning§ Såsom perförening kan därvid användas en organisk eller oorga- nisk peroxid, exempelvis väteperoxid, natriumperoxid eller t-butylhydroperoxid. I en föredragen utföringsform användes väteperoxid. Temperaturen i det första blekningssteget kan uppgå till mellan 40 och 950 C, företrädesvis mellan 50 och 7s° c.The first bleaching step can be carried out with a per-compound at a material density of 5 - 10% by weight, preferably 8 - 12% by weight (based on atrocellulose) in aqueous solution. An organic or inorganic peroxide can be used as the per-compound. , for example hydrogen peroxide, sodium peroxide or t-butyl hydroperoxide. In a preferred embodiment, hydrogen peroxide is used. The temperature in the first bleaching step can be between 40 and 950 ° C, preferably between 50 and 7 ° C.
Det första stegets varaktighet kan uppgå till mellan 30 och 240 min, företrädesvis mellan 60 och 180 min.The duration of the first step can be between 30 and 240 minutes, preferably between 60 and 180 minutes.
Koncentrationen hos perföreningen kan uppgå till 0,5 - 5 vikt-%, företrädesvis 0,8 - 1,2 vikt-% (hänfört till atro cellulosa och 100 % HZOZ). _ Koncentrationen av alkali, företrädesvis natrium- hydroxid, kan uppgå till 1,5 - 10 vikt-%, företrädesvis' 2,0 - 4,0 vikt-% (hänfört till atro cellulosa och 100 % NaOH).The concentration of the per compound may be 0.5 to 5% by weight, preferably 0.8 to 1.2% by weight (based on atro cellulose and 100% H 2 O 2). The concentration of alkali, preferably sodium hydroxide, may be 1.5 to 10% by weight, preferably 2.0 to 4.0% by weight (based on atro cellulose and 100% NaOH).
I det andra steget kan i vattenlösningen såsom klorit användas en alkaliklorit, företrädesvis natriumklorit.In the second step, an alkali chlorite, preferably sodium chlorite, can be used in the aqueous solution such as chlorite.
Poon QUALITY 7907850-7 3 Materialtätheten vid det andra steget kan uppgå till 5 - 15 vikt- %, företrädesvis 8 - 12 vikt-% (hänfört till atro cellulosa).Poon QUALITY 7907850-7 3 The material density in the second step can amount to 5 - 15% by weight, preferably 8 - 12% by weight (attributed to atro cellulose).
Temperaturen kan uppgå till 20 - 80° C, företrädesvis 25 - 600 C. Det andra stegets varaktighet kan ligga mellan 30 och 240 min, företrädesvis mellan 60 och 180 min. Alkalikloritens koncentration kan uppgå till 0,05 - 1,0 vikt-%, företrädesvis 0,1 - 0,3 vikt-% (hänfört till atro cellulosa och 100 % natriumklorit). pH-värdet i det andra steget kan uppgå till 2,5 - 5,0, företrädesvis 3,0 - 4,0. pH-väraet kan' instäiias genom tillsats av en organisk syra, exempelvis myrsyra eller ättiksyra eller en mineralsyra. I en föredragen utföringsform användes salpetersyra (HNO3).The temperature can amount to 20 - 80 ° C, preferably 25 - 600 C. The duration of the second stage can be between 30 and 240 minutes, preferably between 60 and 180 minutes. The concentration of the alkali chlorite may be 0.05 - 1.0% by weight, preferably 0.1 - 0.3% by weight (based on atrocellulose and 100% sodium chlorite). The pH value in the second step can amount to 2.5 - 5.0, preferably 3.0 - 4.0. The pH may be adjusted by the addition of an organic acid, for example formic acid or acetic acid or a mineral acid. In a preferred embodiment, nitric acid (HNO3) is used.
Det tredje blekningssteget kan genomföras med en per- förening i vattenlösning vid en materialtäthet av 5 - 15 vikt- %, företrädesvis 8 - 12 vikt-% ( hänfört till atro cellulosa).The third bleaching step can be carried out with a per compound in aqueous solution at a material density of 5 - 15% by weight, preferably 8 - 12% by weight (attributed to atro cellulose).
Såsom perförening kan användas oorganiska eller organiska peroxider, exempelvis väteperoxid, natriumperoxid eller t-butylhydroperoxid. Företrädesvis användes väteperoxid såsom perförening. Temperaturen kan uppgå till 40 - 950 C, företrädesvis 50 - 65° C. Det tredje blekningsstegets varaktig- het kan uppgå till 30 - 240 min, företrädesvis 60 - 120 min.As the per compound, inorganic or organic peroxides can be used, for example, hydrogen peroxide, sodium peroxide or t-butyl hydroperoxide. Preferably hydrogen peroxide is used as the per compound. The temperature can amount to 40 - 950 ° C, preferably 50 - 65 ° C. The duration of the third bleaching step can amount to 30 - 240 minutes, preferably 60 - 120 minutes.
Koncentrationen i avseende på perföreningen, företrädesvis väteperoxid, kan uppgå till 0,2 - 2,0 vikt-%, företrädes- vis 0,4 - 0,8 vikt-% (hänfört till atro cellulosa och 100 % H202L Koncentrationen i avseende på alkali kan uppgå till 0,5 - 3,0 vikt-%, företrädesvis 0,8 - 1,2 vikt-% (hänfört till atro cellulosa och 100 % NaOH). Såsom alkali kan före- trädesvis användas natriumhydroxid. _ Förfarandet enligt uppfinningen uppvisar den fördelen att genom kombinationen och ordningsföljden hos bleknings- stegen perförening, klorit och perförening samt genom klorit-blekningsstegets genomförande vid ett pH-värde mellan 3 och 5 den möjligheten erhålles att hålla den använda mängden klorit så låg att icke några nämnvärda mängder klor hamnar i avvattensystemet. Detta betyder att förfarandet enligt upp- finningen arbetar praktiskt taget klorfritt. vitheten hos slutprodukten är förbättrad i jäm- förelse med slutprodukterna från de kända förfarandena, varvid e Pøon QUALITY . 79Ö7850-7 k dessutom ntbytet kan ökas med 2 - 3 %.The concentration with respect to the per compound, preferably hydrogen peroxide, may be 0.2 to 2.0% by weight, preferably 0.4 to 0.8% by weight (based on atrocellulose and 100% H 2 O 2 L). The concentration with respect to alkali may amount to 0.5 to 3.0% by weight, preferably 0.8 to 1.2% by weight (based on atro cellulose and 100% NaOH). Sodium hydroxide may preferably be used as the alkali. the advantage that by the combination and order of the bleaching steps per compound, chlorite and percompound and by carrying out the chlorite bleaching step at a pH value between 3 and 5 the possibility is obtained of keeping the amount of chlorite used so low that no appreciable amounts of chlorine end up in This means that the process according to the invention operates practically chlorine-free.The whiteness of the final product is improved in comparison with the final products from the known processes, whereby e Pøon QUALITY 79Ö7850-7 k in addition ntb the area can be increased by 2 - 3%.
Dessutom kan tvättningen mellan det andra och tredje gblekningssteget elimineras, varigenom värmeekonomin förbättras.In addition, the washing between the second and third bleaching steps can be eliminated, thereby improving the heat economy.
Temperaturen i det andra steget kan reduceras till 200 C, vilket innebär en betydande minskning av de korrosions- problem vilka exempelvis kan uppträda vid förfarandet enligt DE-Ps 22 19 504 i_k1°rdioxidsreget (D). d Förfarandet enligt uppfinningen fdrklaras och beskri- ves närmare med ledning av följande exempel; Exempel l Blekning av en boksulfit-konstsilke-cellusa enligt teknikens ståndpunkt l. Steg = 2,2 % Cl tvättning 2 l timme 3 % materialtäthet l5° C 2. steg = 3,6 % Naon 3 rimmar 10 % mareriairärner 7s° c tvättning 3. Steg = 0,4 % akt. ' O klor 4 timmar lO % materialtäthet 40 C tvättning (Ca-hypoklorit) Exempel 2 Blekning av en boksulfit4konstsilke-cellulosa enligt uppfinningen _ 1. steg = 1,0 % Hzoz 4 rimmar 10 2 marerialrärher 75° c 3,0 % NaOH tvättning 2. Steg = 0,15 % NaCl02 l2timmar 10 % materialtäthet 300 C o,4_ % HNo3 d ingen tvättning 3. steg 2 0,4 % Hzoz 2 rimmar 10 % mareria1rärher_ es° c l,0 % NaOH 7907850-7 5 Resultat _ _ Exempel 1 Exempel 2 Vithet i blekt A tillstånd (Elrepho) 92,0 94,6 utbyte t 93, 3 _ 96, e a-cellulosa _ '% 90,6 90,4 R 19 _ % i 94,2 - 93,8 viskositet (SKV) 178 214 _ De båda exemplen visar beträffande en boksulfit-konst- silke-cellulosa att en bättre blekning uppnås med förfarandet enligt uppfinningen. Det med 3,3 % högre cellulosautbyte er- hålles vid i det närmaste oförändrad a-cellulosahalt. Det endast lätt minskade R 19-värdet visar att utbytevinsten i stor utsträckning bibehålles vid mäsk-alkaliseringen och viskostillverkningen. Den högre viskositeten antyder att för- farandet förlöper i hög grad skonsamt för fibern.The temperature in the second stage can be reduced to 200 DEG C., which means a significant reduction in the corrosion problems which may occur, for example, in the process according to DE-Ps 22 19 504 in the carbon dioxide reaction (D). The process according to the invention is explained and described in more detail with reference to the following examples; Example 1 Bleaching of a box sulphite-artificial silk cellus according to the prior art 1. Step = 2.2% Cl washing 2 l hour 3% material density l5 ° C 2nd step = 3.6% Naon 3 rhymes 10% nightmares 7s ° c washing Step = 0.4% act. 0 chlorine 4 hours 10% material density 40 ° C washing (Ca-hypochlorite) Example 2 Bleaching of a box sulphite -cartosilk cellulose according to the invention _ 1st step = 1.0% Hzoz 4 rhymes 10 2 material tubes 75 ° c 3.0% NaOH washing Step 2 = 0.15% NaClO 2 l2 hours 10% material density 300 C 0,4% HNo 3 d no washing 3. step 2 0,4% Hzoz 2 rhymes 10% mareria1rärher_ es ° cl, 0% NaOH 7907850-7 5 Result _ Example 1 Example 2 Whiteness in bleached A state (Elrepho) 92.0 94.6 yield t 93, 3 _ 96, e α-cellulose _ '% 90.6 90.4 R 19 _% in 94.2 - 93 Viscosity (SKV) 178 214 The two examples show with respect to a box sulphite-artificial silk cellulose that a better bleaching is achieved with the process according to the invention. The 3.3% higher cellulose yield is obtained at an almost unchanged α-cellulose content. The only slightly reduced R 19 value shows that the yield gain is largely maintained in the mash alkalization and viscose production. The higher viscosity indicates that the process is very gentle on the fiber.
Den totala kloranvändningen hos det kända bleknings- .förfarandet enligt exempel 1 uppgick hänfört till cellulosa till 2,6 % och vid blekningen enligt uppfinningen till 0,06 %.The total chlorine use of the known bleaching process according to Example 1 amounted to 2.6% in relation to cellulose and in the bleaching according to the invention to 0.06%.
Exempel 3 Blekning av en gran-sulfitcellulosa enligt teknikens ståndpunkt. _ _ ' _ 1. steg = 4,0 t C12 1 timme 3 % meterieltäthet 1s° c i tvättning 2. steg = 3,5 t Neon 1 timme 10 æ meterieltäthet 7o° c tvättning 3. Steg = 1,0 % akt. 7 ' tklor 3 timmar 10 % materialtäthet 40° C tvättning 4. Steg = 1,0' % akt. O klor 3 timmar 10 % materia1täthet_ 40 C g Poon QUALITY 7907050-7 6 Exempel 4 Blekning.av en gran-sulfitcellulosa för papper enligt suppfinningen ' 1. steg = 1,5 % Hzoz 1 timme 10 t meterieltäthet 70° c 3,0 % Neon ' etvättning 2; steg = 0,4 t Necloz 3 timmer 10 % meterie1täthet s0° c 0,5 % HNo3 0 ~ ingen tvättning 3, steg = 1,0 t Hzcz 3 timmer 103% meteria1tätnet_ 60° c 1,5 % Neon tvättning Resultat _ 3 Exempel 3 Exempel 4 ' (uppfinning) vithet i blekt 3 tillstånd 90,3 0 ' 90,7 utbyte , % 92,5 ' ' 93,1 Vid i ringa grad ökad vithet och något bättre utbyte minskas klorhalten i avloppsvattnet genom förfarandet enligt uppfinningen från 6 %, hänfört till den behandlade cellulosan, ti11 0,16 %. _ Exempel 5 Blekning av en gran-sulfitcellulosa enligt uppfinningen Förbehandlingssteg 10 min. 5 % materialtäthet l5° C 0,3 % Mgso4 förtjockning till 10 % materialtäthet 1. steg = 1,3 % Hzoz 1 timme 10 t meterie1tätnet 70° c 3,0 % NaOH tvättning 2; Steg = 0,4 % NaCl02 3 timmar 10 % materialtäthet 30° C 3. Steg = 1,0 %'H2O2 _ 1,5 t Neon _ 3 timmer 10 t mete;ie1täthet e0° c Det blekta materialet kom upp till.9l,O % vithet. Genom förbehandlingen med MgSQ4 kunde peroxidanvändningen i det första steget minskas till I,3 % H2O2; G I mot. QiïaimfExample 3 Bleaching of a prior art spruce sulfite cellulose. _ _ '_ 1st step = 4.0 t C12 1 hour 3% material density 1s ° c in washing 2nd step = 3.5 t Neon 1 hour 10 æ material density 7o ° c washing 3. Step = 1.0% act. 7 'chlorine 3 hours 10% material density 40 ° C washing 4. Step = 1.0'% act. Chlorine 3 hours 10% material density_ 40 C g Poon QUALITY 7907050-7 6 Example 4 Bleaching of a spruce sulphite cellulose for paper according to the soup invention '1st step = 1.5% Hzoz 1 hour 10 h material density 70 ° c 3.0 % Neon 'wash 2; step = 0.4 t Necloz 3 hours 10% meter density1 s0 ° c 0.5% HNo3 0 ~ no washing 3, step = 1.0 h Hzcz 3 hours 103% density_ 60 ° c 1.5% Neon wash Results _ 3 Example 3 Example 4 '(invention) whiteness in bleached 3 state 90.3 0' 90.7 yield,% 92.5 '' 93.1 With slightly increased whiteness and slightly better yield, the chlorine content in the wastewater is reduced by the process according to the invention from 6%, attributed to the treated cellulose, to 0.16%. Example 5 Bleaching of a spruce sulphite cellulose according to the invention Pretreatment step 10 min. 5% material density l5 ° C 0.3% Mgso4 thickening to 10% material density 1st step = 1.3% Hzoz 1 hour 10 h material density 70 ° c 3.0% NaOH wash 2; Step = 0.4% NaClO2 3 hours 10% material density 30 ° C 3. Step = 1.0% 'H2O2 _ 1.5 t Neon _ 3 hours 10 h mete; density1 e0 ° c The bleached material came up to.9l , 0% whiteness. Through the pretreatment with MgSQ4, the peroxide use in the first step could be reduced to 1.3% H2O2; G I mot. Qiïaimf
Claims (6)
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 (2)
| Publication Number | Publication Date |
|---|---|
| SE7907850L SE7907850L (en) | 1980-03-22 |
| SE445366B true SE445366B (en) | 1986-06-16 |
Family
ID=6049994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7907850A SE445366B (en) | 1978-09-21 | 1979-09-21 | PROCEDURE IN MULTIPLE STEPS FOR WHICH BLELLING CELLULOSA WITH ALKALIC PEROXIDE AND ACID CHLORITE SOLUTIONS |
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 |
| SE466060C (en) | 1990-02-13 | 1995-09-11 | Moelnlycke Ab | Absorbent chemitermomechanical mass and preparation thereof |
| US5607546A (en) * | 1990-02-13 | 1997-03-04 | Molnlycke Ab | CTMP-process |
| 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 | 1999-09-20 | 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 | 1999-09-27 | 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 |
|---|---|
| ATA620579A (en) | 1983-02-15 |
| CH641515A5 (en) | 1984-02-29 |
| DE2841013C2 (en) | 1984-06-07 |
| FR2436846B1 (en) | 1982-08-27 |
| NO153342C (en) | 1986-02-26 |
| FI68681B (en) | 1985-06-28 |
| NO153342B (en) | 1985-11-18 |
| BR7905860A (en) | 1980-05-20 |
| IT1119314B (en) | 1986-03-10 |
| NO792067L (en) | 1980-03-24 |
| CA1122358A (en) | 1982-04-27 |
| IT7968380A0 (en) | 1979-06-29 |
| AT372426B (en) | 1983-10-10 |
| DE2841013A1 (en) | 1980-04-03 |
| FR2436846A1 (en) | 1980-04-18 |
| FI792115A7 (en) | 1980-03-22 |
| SE7907850L (en) | 1980-03-22 |
| BE878841A (en) | 1980-03-17 |
| FI68681C (en) | 1985-10-10 |
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| Date | Code | Title | Description |
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| NUG | Patent has lapsed |
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