FI76134C - Foerfarande foer behandling av kemiska pappersmassor. - Google Patents
Foerfarande foer behandling av kemiska pappersmassor. Download PDFInfo
- Publication number
- FI76134C FI76134C FI830288A FI830288A FI76134C FI 76134 C FI76134 C FI 76134C FI 830288 A FI830288 A FI 830288A FI 830288 A FI830288 A FI 830288A FI 76134 C FI76134 C FI 76134C
- Authority
- FI
- Finland
- Prior art keywords
- treatment
- pulp
- acid
- temperature
- pulps
- Prior art date
Links
- 238000011282 treatment Methods 0.000 title claims description 71
- 238000000034 method Methods 0.000 title claims description 18
- 229920001131 Pulp (paper) Polymers 0.000 title claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 23
- 239000002253 acid Substances 0.000 claims description 21
- 150000002978 peroxides Chemical class 0.000 claims description 17
- 238000010306 acid treatment Methods 0.000 claims description 9
- 150000007524 organic acids Chemical class 0.000 claims description 3
- 150000007522 mineralic acids Chemical class 0.000 claims 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 239000000243 solution Substances 0.000 description 16
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 12
- 229910021653 sulphate ion Inorganic materials 0.000 description 12
- 238000004061 bleaching Methods 0.000 description 11
- 150000001768 cations Chemical class 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 239000011122 softwood Substances 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 229920005610 lignin Polymers 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- UDHXJZHVNHGCEC-UHFFFAOYSA-N Chlorophacinone Chemical compound C1=CC(Cl)=CC=C1C(C=1C=CC=CC=1)C(=O)C1C(=O)C2=CC=CC=C2C1=O UDHXJZHVNHGCEC-UHFFFAOYSA-N 0.000 description 6
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 239000004155 Chlorine dioxide Substances 0.000 description 3
- 241001070947 Fagus Species 0.000 description 3
- 235000010099 Fagus sylvatica Nutrition 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 235000019398 chlorine dioxide Nutrition 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000011121 hardwood Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N hydrochloric acid Substances Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000000123 paper Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 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 2
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 235000005985 organic acids Nutrition 0.000 description 2
- XXQBEVHPUKOQEO-UHFFFAOYSA-N potassium superoxide Chemical compound [K+].[K+].[O-][O-] XXQBEVHPUKOQEO-UHFFFAOYSA-N 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 239000004343 Calcium peroxide Substances 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- IVAOQJNBYYIDSI-UHFFFAOYSA-N [O].[Na] Chemical compound [O].[Na] IVAOQJNBYYIDSI-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- AFVAAKZXFPQYEJ-UHFFFAOYSA-N anthracene-9,10-dione;sodium Chemical compound [Na].C1=CC=C2C(=O)C3=CC=CC=C3C(=O)C2=C1 AFVAAKZXFPQYEJ-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 description 1
- 235000019402 calcium peroxide Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- -1 manganese cations Chemical class 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 229960001922 sodium perborate Drugs 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
- YKLJGMBLPUQQOI-UHFFFAOYSA-M sodium;oxidooxy(oxo)borane Chemical compound [Na+].[O-]OB=O YKLJGMBLPUQQOI-UHFFFAOYSA-M 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- 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
- D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8201603 | 1982-01-28 | ||
| FR8201603A FR2520397A1 (fr) | 1982-01-28 | 1982-01-28 | Procede pour le traitement de pates papetieres chimiques |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| FI830288A0 FI830288A0 (fi) | 1983-01-27 |
| FI830288L FI830288L (fi) | 1983-07-29 |
| FI76134B FI76134B (fi) | 1988-05-31 |
| FI76134C true FI76134C (fi) | 1988-09-09 |
Family
ID=9270561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI830288A FI76134C (fi) | 1982-01-28 | 1983-01-27 | Foerfarande foer behandling av kemiska pappersmassor. |
Country Status (16)
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1227304A (en) * | 1984-08-01 | 1987-09-29 | Raymond C. Francis | Delignification of pulp |
| FR2593527B1 (fr) * | 1986-01-30 | 1988-03-25 | Centre Tech Ind Papier | Procede de blanchiment des pates mecaniques. |
| DK0402335T4 (da) * | 1989-06-06 | 2001-06-25 | Eka Chemicals Ab | Fremgangsmåde til blegning af lignocelluloseholdigpulp |
| US5246543A (en) * | 1989-08-18 | 1993-09-21 | Degussa Corporation | Process for bleaching and delignification of lignocellulosic materials |
| US5091054A (en) * | 1989-08-18 | 1992-02-25 | Degussa Corporation | Process for bleaching and delignification of lignocellulosic |
| DE3937932A1 (de) * | 1989-11-15 | 1991-05-16 | Holtzmann & Cie Ag E | Verfahren zum delignifizieren und bleichen von ungebleichten zellstoffsuspensionen mit alkalichlorit |
| SE466061B (sv) * | 1990-04-23 | 1991-12-09 | Eka Nobel Ab | Blekning av kemisk massa genom behandling med foerst ett komplexbildande aemne och sedan ett peroxidinnehaallande aemne |
| SE9001481L (sv) * | 1990-04-23 | 1991-10-24 | Eka Nobel Ab | Reduktion av halogenorganiska foereningar i blekeriavlopp |
| US6398908B1 (en) | 1991-04-30 | 2002-06-04 | Eka Nobel Ab | Process for acid bleaching of lignocellulose-containing pulp with a magnesium compound |
| SE470065C (sv) * | 1991-04-30 | 1996-01-15 | Eka Nobel Ab | Behandling av kemisk massa med en syra och därefter en magnesium- och kalciumförening vid klorfri blekning |
| SE500113C2 (sv) | 1992-07-09 | 1994-04-18 | Kamyr Ab | Sätt vid blekning av massa för omhändertagande av utlösta metaller |
| SE512137C2 (sv) * | 1992-10-29 | 2000-01-31 | Eka Chemicals Ab | Förfarande för blekning av lignocellulosahaltig massa |
| SE9301960L (sv) * | 1993-06-08 | 1994-07-25 | Kvaerner Pulping Tech | Blekning av kemisk massa med peroxid vid övertryck |
| US6776876B1 (en) | 1994-10-13 | 2004-08-17 | Andritz Oy | Method of treating cellulosic pulp to remove hexenuronic acid |
| WO1996025552A1 (en) * | 1995-02-17 | 1996-08-22 | Ahlstrom Machinery Oy | Method of pretreating pulp to be bleached with peroxide |
| SE526241C2 (sv) * | 2003-12-18 | 2005-08-02 | Metso Paper Inc | Förfarande för att surgöra lignocellulosahaltig massa före ozonblekning |
| US8080560B2 (en) | 2004-12-17 | 2011-12-20 | 3M Innovative Properties Company | Immune response modifier formulations containing oleic acid and methods |
| FI121311B (fi) * | 2005-05-03 | 2010-09-30 | M Real Oyj | Menetelmä paperin- ja kartonginvalmistukseen soveltuvan mekaanisen massan valmistamiseksi |
| US8889154B2 (en) | 2005-09-15 | 2014-11-18 | Medicis Pharmaceutical Corporation | Packaging for 1-(2-methylpropyl)-1H-imidazo[4,5-c] quinolin-4-amine-containing formulation |
| US8980051B2 (en) | 2009-04-24 | 2015-03-17 | International Paper Company | Sulfonation of pulp produced by alkali pulping process |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1705897A (en) * | 1922-03-16 | 1929-03-19 | Bradley Linn | Bleaching of pulp |
| GB601292A (en) * | 1945-02-05 | 1948-05-03 | Buffalo Electro Chem Co | Improvements in the bleaching of ground wood pulp |
| FR1010501A (fr) * | 1948-08-31 | 1952-06-12 | Papiers Abadie Sa Des | Procédé de blanchîment des pâtes cellulosiques |
| US2668095A (en) * | 1950-09-22 | 1954-02-02 | Du Pont | Bleaching chemical paper pulp |
| FR1201712A (fr) * | 1958-07-11 | 1960-01-05 | Fr Du Xylon Soc | Perfectionnements au blanchiment des pâtes cellulosiques |
| JPS51102103A (en) * | 1975-03-05 | 1976-09-09 | Nippon Parupu Kogyo Kk | Ryusanenhoparupuno hyohakuhoho |
| FR2398839A1 (fr) * | 1977-07-29 | 1979-02-23 | Centre Tech Ind Papier | Procede de fabrication de pates papetieres chimiques |
| DE2742262C2 (de) * | 1977-09-20 | 1982-06-09 | Degussa Ag, 6000 Frankfurt | Verfahren zur Herstellung eines mittel- bis hochviskosen Nadelholz-Sulfitzellstoffs |
| SE420430B (sv) * | 1978-02-17 | 1981-10-05 | Mo Och Domsjoe Ab | Forfarande for blekning och extraktion av lignocellulosahaltig material med peroxidhaltiga blekmedel |
| JPS5685489A (en) * | 1979-12-10 | 1981-07-11 | Kogyo Gijutsuin | Pulp production |
| DE3005947B1 (de) * | 1980-02-16 | 1981-01-29 | Degussa | Verfahren zur Bleiche von Zellstoffen mittels organischer Persaeure |
-
1982
- 1982-01-28 FR FR8201603A patent/FR2520397A1/fr active Granted
- 1982-12-22 SE SE8207356A patent/SE462288B/sv unknown
- 1982-12-23 KR KR8205769A patent/KR850001341B1/ko not_active Expired
-
1983
- 1983-01-07 IT IT67014/83A patent/IT1162810B/it active
- 1983-01-19 BE BE0/209926A patent/BE895645A/fr not_active IP Right Cessation
- 1983-01-25 CA CA000420203A patent/CA1206704A/fr not_active Expired
- 1983-01-26 PT PT76145A patent/PT76145B/pt not_active IP Right Cessation
- 1983-01-26 DE DE19833302580 patent/DE3302580A1/de active Granted
- 1983-01-27 BR BR8300402A patent/BR8300402A/pt not_active IP Right Cessation
- 1983-01-27 CH CH463/83A patent/CH653720A5/fr not_active IP Right Cessation
- 1983-01-27 FI FI830288A patent/FI76134C/fi not_active IP Right Cessation
- 1983-01-27 NO NO830268A patent/NO161391C/no unknown
- 1983-01-27 AT AT0026383A patent/AT381736B/de not_active IP Right Cessation
- 1983-01-27 ES ES519327A patent/ES519327A0/es active Granted
- 1983-01-28 OA OA57907A patent/OA07313A/xx unknown
- 1983-01-28 JP JP58011603A patent/JPS58132190A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| ES8400520A1 (es) | 1983-10-16 |
| NO161391C (no) | 1989-08-09 |
| DE3302580C2 (enrdf_load_stackoverflow) | 1992-07-02 |
| ATA26383A (de) | 1986-04-15 |
| FI76134B (fi) | 1988-05-31 |
| IT1162810B (it) | 1987-04-01 |
| KR840002934A (ko) | 1984-07-21 |
| ES519327A0 (es) | 1983-10-16 |
| JPS58132190A (ja) | 1983-08-06 |
| CH653720A5 (fr) | 1986-01-15 |
| SE462288B (sv) | 1990-05-28 |
| FR2520397B1 (enrdf_load_stackoverflow) | 1984-03-09 |
| FI830288L (fi) | 1983-07-29 |
| JPH0217679B2 (enrdf_load_stackoverflow) | 1990-04-23 |
| PT76145A (fr) | 1983-02-01 |
| BR8300402A (pt) | 1983-11-01 |
| CA1206704A (fr) | 1986-07-02 |
| SE8207356D0 (sv) | 1982-12-22 |
| OA07313A (fr) | 1984-08-31 |
| NO161391B (no) | 1989-05-02 |
| AT381736B (de) | 1986-11-25 |
| FI830288A0 (fi) | 1983-01-27 |
| SE8207356L (sv) | 1983-07-29 |
| NO830268L (no) | 1983-07-29 |
| DE3302580A1 (de) | 1983-08-04 |
| FR2520397A1 (fr) | 1983-07-29 |
| KR850001341B1 (ko) | 1985-09-19 |
| PT76145B (fr) | 1985-11-25 |
| BE895645A (fr) | 1983-07-19 |
| IT8367014A0 (it) | 1983-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FI76134C (fi) | Foerfarande foer behandling av kemiska pappersmassor. | |
| RU2071519C1 (ru) | Способ делигнификации и отбеливания целлюлозы | |
| US5310458A (en) | Process for bleaching lignocellulose-containing pulps | |
| RU2044808C1 (ru) | Способ многостадийной отбелки целлюлозы | |
| JPS6320953B2 (enrdf_load_stackoverflow) | ||
| JPH08503750A (ja) | リグノセルロース含有パルプの脱リグニン化法 | |
| JPH05148784A (ja) | リグノセルロース含有パルプの漂白方法 | |
| US3725194A (en) | Treatment of alkaline pulp with an acidic medium followed by oxygen bleaching and delignification | |
| RU2439232C2 (ru) | Способ отбеливания бумажной целлюлозной массы путем конечной обработки озоном при высокой температуре | |
| FI74053C (fi) | Foerfarande foer delignifiering av kemisk massa. | |
| RU2019613C1 (ru) | Способ отбелки лиственной сульфатной целлюлозы | |
| US6679972B1 (en) | Process for the bleaching of a pulp suspension by separating calcium from lignin | |
| NZ205971A (en) | Delignifying bleaching of cellulosic pulp using nitrogen oxides with addition of sodium nitrate | |
| US10006168B2 (en) | Method for treating chemical pulps by treatment with ozone in the presence of magnesium ions | |
| FI118572B (fi) | Menetelmä lignoselluloosaa sisältävän massan valkaisemiseksi | |
| WO1992017639A1 (en) | Method for reducing colored matter from bleach effluent using a dzd bleach sequence | |
| RU2072014C1 (ru) | Способ отбеливания лигноцеллюлозосодержащей древесной пульпы | |
| US4787959A (en) | Process for preparing chemical paper pulps by cooking, intermediate grinding and a final alkaline peroxide delignification | |
| JPS6214678B2 (enrdf_load_stackoverflow) | ||
| RU2097462C1 (ru) | Способ делигнификации и отбеливания лигноцеллюлозосодержащей пульпы | |
| SK4793A3 (en) | Process for delignifying raw cellulose | |
| CA2405325A1 (en) | A method for controlling the delignification and bleaching of a pulp suspension | |
| JPH05195467A (ja) | ケミカルペーパーパルプの脱リグニン化の選択性を改良するための方法 | |
| CA1274655A (en) | Process for the bleaching of ns-aq or sap pulp | |
| RU2123552C1 (ru) | Способ отбелки целлюлозы |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM | Patent lapsed | ||
| MM | Patent lapsed |
Owner name: PCUK PRODUITS CHIMIGUES UGINE KUHLMANN |