FI70940C - Avlaegsnande av lignin med anvaendning av laog ozonhalt - Google Patents
Avlaegsnande av lignin med anvaendning av laog ozonhalt Download PDFInfo
- Publication number
- FI70940C FI70940C FI793664A FI793664A FI70940C FI 70940 C FI70940 C FI 70940C FI 793664 A FI793664 A FI 793664A FI 793664 A FI793664 A FI 793664A FI 70940 C FI70940 C FI 70940C
- Authority
- FI
- Finland
- Prior art keywords
- pulp
- ozone
- slurry
- amount
- gas
- Prior art date
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 170
- 239000000835 fiber Substances 0.000 claims description 51
- 238000004061 bleaching Methods 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 238000012546 transfer Methods 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 40
- 239000002002 slurry Substances 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 17
- 229920001131 Pulp (paper) Polymers 0.000 claims description 14
- 229920003043 Cellulose fiber Polymers 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 156
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 123
- 239000013055 pulp slurry Substances 0.000 description 76
- 239000004155 Chlorine dioxide Substances 0.000 description 63
- 235000019398 chlorine dioxide Nutrition 0.000 description 63
- 238000011282 treatment Methods 0.000 description 41
- 239000007844 bleaching agent Substances 0.000 description 37
- 239000000126 substance Substances 0.000 description 36
- 239000007789 gas Substances 0.000 description 34
- 239000001301 oxygen Substances 0.000 description 32
- 229910052760 oxygen Inorganic materials 0.000 description 32
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 31
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 30
- 238000002474 experimental method Methods 0.000 description 29
- 239000000463 material Substances 0.000 description 27
- 239000000460 chlorine Substances 0.000 description 25
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 23
- 238000000605 extraction Methods 0.000 description 23
- 238000006243 chemical reaction Methods 0.000 description 22
- 229910052801 chlorine Inorganic materials 0.000 description 18
- 239000000243 solution Substances 0.000 description 18
- 229920002678 cellulose Polymers 0.000 description 16
- 239000001913 cellulose Substances 0.000 description 16
- 238000010411 cooking Methods 0.000 description 16
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 16
- 239000002655 kraft paper Substances 0.000 description 16
- 239000002023 wood Substances 0.000 description 16
- 230000035484 reaction time Effects 0.000 description 15
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 14
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 14
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 12
- 229920005610 lignin Polymers 0.000 description 12
- 230000000670 limiting effect Effects 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 239000012071 phase Substances 0.000 description 10
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 8
- 239000000872 buffer Substances 0.000 description 8
- 230000007704 transition Effects 0.000 description 8
- 239000003513 alkali Substances 0.000 description 7
- -1 ozone peroxide Chemical class 0.000 description 7
- 239000000123 paper Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 238000006385 ozonation reaction Methods 0.000 description 6
- 238000012216 screening Methods 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 239000012286 potassium permanganate Substances 0.000 description 5
- 241000283153 Cetacea Species 0.000 description 4
- NHYCGSASNAIGLD-UHFFFAOYSA-N Chlorine monoxide Chemical compound Cl[O] NHYCGSASNAIGLD-UHFFFAOYSA-N 0.000 description 4
- 240000001416 Pseudotsuga menziesii Species 0.000 description 4
- 235000008572 Pseudotsuga menziesii Nutrition 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 238000013508 migration Methods 0.000 description 4
- 230000005012 migration Effects 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 235000017550 sodium carbonate Nutrition 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- RSPISYXLHRIGJD-UHFFFAOYSA-N OOOO Chemical compound OOOO RSPISYXLHRIGJD-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- JFBJUMZWZDHTIF-UHFFFAOYSA-N chlorine chlorite Inorganic materials ClOCl=O JFBJUMZWZDHTIF-UHFFFAOYSA-N 0.000 description 3
- 229910001902 chlorine oxide Inorganic materials 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- 150000002978 peroxides Chemical class 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 235000014347 soups Nutrition 0.000 description 3
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 3
- 238000004448 titration Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- RRCYYLHJWRYWEI-UHFFFAOYSA-N OOOOOOOOOOOOOOOOOOOOO Chemical compound OOOOOOOOOOOOOOOOOOOOO RRCYYLHJWRYWEI-UHFFFAOYSA-N 0.000 description 2
- 241000218657 Picea Species 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- OGIIWTRTOXDWEH-UHFFFAOYSA-N [O].[O-][O+]=O Chemical compound [O].[O-][O+]=O OGIIWTRTOXDWEH-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 235000014633 carbohydrates Nutrition 0.000 description 2
- 150000001720 carbohydrates Chemical class 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000009790 rate-determining step (RDS) Methods 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 2
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 2
- 235000019345 sodium thiosulphate Nutrition 0.000 description 2
- 239000011122 softwood Substances 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 229910021653 sulphate ion Inorganic materials 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- DNNMMTMWKAQQMC-UHFFFAOYSA-N C(C)(=O)O.O=[O+][O-].[O] Chemical compound C(C)(=O)O.O=[O+][O-].[O] DNNMMTMWKAQQMC-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000218631 Coniferophyta Species 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-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
- 101000737983 Enterobacter agglomerans Monofunctional chorismate mutase Proteins 0.000 description 1
- 244000166124 Eucalyptus globulus Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- 239000004133 Sodium thiosulphate Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- JLMIGTMAQZSLCL-UHFFFAOYSA-L [OH-].[Na+].[Cl+](=O)=O.[OH-] Chemical compound [OH-].[Na+].[Cl+](=O)=O.[OH-] JLMIGTMAQZSLCL-UHFFFAOYSA-L 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- HOVAGTYPODGVJG-ZFYZTMLRSA-N methyl alpha-D-glucopyranoside Chemical compound CO[C@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O HOVAGTYPODGVJG-ZFYZTMLRSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- QKFJKGMPGYROCL-UHFFFAOYSA-N phenyl isothiocyanate Chemical compound S=C=NC1=CC=CC=C1 QKFJKGMPGYROCL-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004076 pulp bleaching Methods 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 244000148755 species properties Species 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Landscapes
- Paper (AREA)
Claims (24)
1. Förfarande för blekning av cellulosafibrer om- fattande följande steg: man bildar en uppslamning genom att sätta fibrerna tili ett lösningsmedel, man inleder i uppslamningen en ozonhaltig gas, varvid ozonet är närvaran-de i en mängd av 0,5 - 23 vikt-% beräknat pä totalmängden av den ozonhaltiga gasen, man omrör uppslamningen och gasen, kännetecknat därav, att lösningsmedlet bestär väsentligen av vatten med ett begynnelse-pH-värde av 2-8, att fibrerna är närvarande i uppslamningen i en mängd av 0,017 - cirka 0,7 % beräknat pä totalvikten av den icke gashaltiga, ungnstorra uppslamningen, och att man till om-röring av uppslamningen och gasen använder omröringseffekt 3 i en mängd av 0,05 - 26 kW per m gasbehandlad uppslamning, varvid överföring av ozon underlättas.
2. Förfarande enligt patentkravet 1, kännetecknat därav, att uppslamningen och gasen omrörs med en omröringseffekt av 0,05 - 10 kW per m^ gasbehandlad uppslamning för att underlätta överföring av ozon genom gränsytan gas/vätska.
3. Förfarande enligt patentkravet 2, kännetecknat därav, att cellulosafibrerna är närvarande i en mängd av 0,15 - 0,7 % beräknad pä totalvikten av icke-gashaltig uppslamning.
4. Förfarande enligt patentkravet 3, kännetecknat därav, att cellulosafibrerna är närvarande i en mängd av 0,3 - cirka 0,7 % beräknat pä totalvikten av icke-gashaltig uppslamning.
5. Förfarande enligt patentkravet 2, kännetecknat därav, att cellulosafibrerna utgörs av trä-massafibrer.
6. Förfarande enligt patentkravet 2, kännetecknat därav, att den ozonhaltiga gasen har en yt-hastighet av 60-1140 m/h.
7. Förfarande enligt patentkravet 6, kännetecknat därav, att gasen har en ythastighet av 60-420 m/h. 46 7 0 9 4 0
8. Förfarande enligt patentkravet 1, känne-t e c k n a t därav, att uppslamningen och gasen omrörs med en omröringseffekt av 5-25 kW per gasbehandlad uppslamning.
9. Förfarande enligt patentkravet 8, känne-t e c k n a t därav, att cellulosafibrerna är närvarande i en mängd av 0,15 - cirka 0,7 % beräknat pä totalvikten av icke-gashaltig uppslamning.
10. Förfarande enligt patentkravet 9, känne-t e c k n a t därav, att cellulosafibrerna är närvarande i en mängd av 0,3 - cirka 0,7 % beräknat pä totalvikten av icke-gashaltig uppslamning.
11. Förfarande enligt patentkravet 8, känne-t e c k n a t därav, att cellulosafibrerna utgörs av trä-massafibrer.
12. Förfarande enligt patentkravet 1, känne-t e c k n a t därav, att uppslamningen och gasen blandas under användning av en blandningseffekt av 0,05-5 kW per m^ gasbehandlad uppslamning för att underlätta överföring av ozon genom gränsytan gas/vätska.
13. Förfarande enligt patentkravet 12, känne-t e c k n a t därav, att cellulosafibrerna är närvarande i en mängd av 0,3 - cirka 0,7 % beräknat pä totalvikten av icke-gashaltig uppslamning.
14. Förfarande enligt patentkravet 13, känne-t e c k n a t därav, att cellulosafibrerna är närvarande i en mängd av 0,3 - cirka 0,7 % beräknat pä totalvikten av icke-gashaltig uppslamning.
15. Förfarande enligt patentkravet 12, känne-t e c k n a t därav, att gasen innehällande ozon har genom uppslamningen en ythastighet av 60-1140 m/h.
16. Förfarande enligt patentkravet 15, känne-t e c k n a t därav, attgasen innehällande ozon har genom uppslamningen en ythastighet av 60-420 m/h.
17. Förfarande enligt patentkravet 12, känne-t e c k n a t därav, att cellulosafibrerna utgörs av trä-massafibrer. Il
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI793664A FI70940C (fi) | 1979-11-22 | 1979-11-22 | Avlaegsnande av lignin med anvaendning av laog ozonhalt |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI793664A FI70940C (fi) | 1979-11-22 | 1979-11-22 | Avlaegsnande av lignin med anvaendning av laog ozonhalt |
| FI793664 | 1979-11-22 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| FI793664A7 FI793664A7 (fi) | 1981-05-23 |
| FI70940B FI70940B (fi) | 1986-07-18 |
| FI70940C true FI70940C (fi) | 1986-10-27 |
Family
ID=8513066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI793664A FI70940C (fi) | 1979-11-22 | 1979-11-22 | Avlaegsnande av lignin med anvaendning av laog ozonhalt |
Country Status (1)
| Country | Link |
|---|---|
| FI (1) | FI70940C (sv) |
-
1979
- 1979-11-22 FI FI793664A patent/FI70940C/fi not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FI793664A7 (fi) | 1981-05-23 |
| FI70940B (fi) | 1986-07-18 |
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