FI61925C - Saett vid kontinuerlig alkalisk delignifiering av lignocellulosamaterial i tvao eller flera steg varav det sista med syrgas - Google Patents
Saett vid kontinuerlig alkalisk delignifiering av lignocellulosamaterial i tvao eller flera steg varav det sista med syrgas Download PDFInfo
- Publication number
- FI61925C FI61925C FI751443A FI751443A FI61925C FI 61925 C FI61925 C FI 61925C FI 751443 A FI751443 A FI 751443A FI 751443 A FI751443 A FI 751443A FI 61925 C FI61925 C FI 61925C
- Authority
- FI
- Finland
- Prior art keywords
- liquor
- oxy
- cooking
- hydroxide
- digester
- Prior art date
Links
- 238000010411 cooking Methods 0.000 claims description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 24
- 238000005406 washing Methods 0.000 claims description 23
- 229910052760 oxygen Inorganic materials 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 14
- 230000008929 regeneration Effects 0.000 claims description 11
- 238000011069 regeneration method Methods 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 239000003513 alkali Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000001704 evaporation Methods 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 5
- 239000012978 lignocellulosic material Substances 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000010790 dilution Methods 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 150000003388 sodium compounds Chemical class 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 3
- 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 claims description 2
- 238000004458 analytical method Methods 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims description 2
- 238000010924 continuous production Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 230000001172 regenerating effect Effects 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims 3
- 239000000835 fiber Substances 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000007795 chemical reaction product Substances 0.000 claims 1
- 238000004140 cleaning Methods 0.000 claims 1
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 235000006408 oxalic acid Nutrition 0.000 claims 1
- 238000003918 potentiometric titration Methods 0.000 claims 1
- 239000002023 wood Substances 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 43
- 235000011121 sodium hydroxide Nutrition 0.000 description 18
- 238000004061 bleaching Methods 0.000 description 14
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 5
- 150000003464 sulfur compounds Chemical class 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- -1 peroxides and ozone Chemical class 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
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 235000019398 chlorine dioxide Nutrition 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 235000014347 soups Nutrition 0.000 description 3
- NHYCGSASNAIGLD-UHFFFAOYSA-N Chlorine monoxide Chemical compound Cl[O] NHYCGSASNAIGLD-UHFFFAOYSA-N 0.000 description 2
- 102100030386 Granzyme A Human genes 0.000 description 2
- 101001009599 Homo sapiens Granzyme A Proteins 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 229910001902 chlorine oxide Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000758794 Asarum Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- YDFHVOKEEMMIBE-RDJQXTLESA-N M-factor Chemical compound C([C@@H](C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CSC\C=C(/C)CC\C=C(/C)CCC=C(C)C)C(=O)OC)NC(=O)[C@H]1N(CCC1)C(=O)[C@@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H]1N(CCC1)C(=O)[C@@H](NC(=O)[C@@H](N)CC=1C=CC(O)=CC=1)[C@@H](C)O)C(C)C)C1=CC=C(O)C=C1 YDFHVOKEEMMIBE-RDJQXTLESA-N 0.000 description 1
- 101710204204 M-factor Proteins 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003113 alkalizing effect Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000010549 co-Evaporation Methods 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000000227 grinding Methods 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
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- HYWYRSMBCFDLJT-UHFFFAOYSA-N nimesulide Chemical compound CS(=O)(=O)NC1=CC=C([N+]([O-])=O)C=C1OC1=CC=CC=C1 HYWYRSMBCFDLJT-UHFFFAOYSA-N 0.000 description 1
- 229960000965 nimesulide Drugs 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 150000002927 oxygen compounds Chemical class 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 210000004885 white matter Anatomy 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
- D21C9/1026—Other features in bleaching processes
-
- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Claims (6)
1. Förfarande för kontinuerlig framställning av massa av ligno-cellulosamaterial, exempelvis vedflis, genom alkalisk delignifiering, företrädesvis enligt sulfatmetoden, dvs. med lutar som innehäller hydroxidavgivande natriumföreningar, varvid delignifiering utföres i tvä eller flera steg (3, 4), varvid i det avslutande steget (4), dvs. oxysteget, en ur lignocellulosamaterialet framställd brunmassa oxideras med oxygen till oxymassa medan närmast föregaende steg, som är ett koksteg i ett kontinuerligt kokeri (3) innefattande ett eller flera med varandra förbundna kokarkärl eller zoner i nägot av kärlen för lignocellulosamaterialet, genomföres med av hydroxidavgivande lut säsom vitlut (1, 5) beredd koklut, vilken innehäller oxygenförbrukande utlöst materialsubstans och eventuellt andra redu-cerande föreningar, varefter ur brunmassan utlöst substans och andra svartlutbildande substanser förtränges genom uttvättning (15) frän brunmassa med oxylut (14), varvid den i kokeriet införda oxylutens vatteninnehäll utspäder den frän kokeriet utvunna svartluten, av-sedd för kemikalieregenerering, i sä liten grad att regenereringen ur svartlutsubstansen (25, 30) av de hydroxidavgivande natrium-föreningarna kan genomföras med ekonomiskt gynnsam energibalans för vattnets avdrivning under svartlutindunstning (25) i relation till oxystegets belastning med oxygenreducerande lÖsta substanser, kännetecknat därav, att a) för svartlut resp. för koklut gällande förhällande 61925 11 oxygenreducerande substans natrium styres genom tillförsel till kokluten i kokaren (3) (kokzonen (3a) i en flerzonskokare) av oxylut (14) och ätminstone större delen av till processen totalt tillförd hydroxidavgivande lut (vitlut), vil-ken koklut ledes ätminstone delvis motströms lignocellulosamaterialet si att frän kokaren (kokarzonen (3b) i en flerzonskokare) avdragna svartlutens (18) R-värde blir större än R-värdet för i brunmassan innesluten fraktion av kokluten efter hydroxiddelignifieringen när uttvättningen (15) av reaktionsprodukterna med oxylut inledes, b) koklutens innehäll av hydroxid och förbrukningen av hydroxid styres genom hydroxidlutdosering (vitlut) via en reglerventil (16) sä att den ur oxyluten frigörbara hydroxiden och den successivt bildade svartlutens innehäll av hydroxidrester helt eller tili över-vägande del förbrukas av lignocellulosamaterialets (19) surt reage-rande beständsdelar i ett koksteg (kokzonen (3b) i en flerzonskokare) medan i brunmassan innesluten fraktion av kokluten tili över-vägande del förtränges motströms brunmassan i ett tvättsteg (tvätt-zonen (15) i en flerzonskokare) med oxylut (14) samt att efter eventuella ytterligare förträngningssteg och/eller tvättsteg med oxylut den resulterande lutblandningen överföres med brunmassan (7) tili oxysteget (4), vilket förutom direkt via (6) tillföres hydroxid frän recirkulerad oxylut (14) och frän den brunmassan medföljande äterstoden av hydroxid, som tillförts systemet med vitlut (5, 16).
2. Sätt enligt patentkravet 1, kännetecknat därav, att en del av den för lutförträngning frän brunmassan använda oxyluten avledes tili regenereringen (25, 30) frän ett förträngningssteg (15) i anslutning tili kokaren.
3. Sätt enligt patentkravet 1 eller 2, kännetecknat därav, att en del av oxyluten (14) användes för upplösning och/ eller beredning vid regenerering av hydroxid, företrädesvis brun-lut frän kausticeringssteg (30), varefter delarna (5 och 14) äter-förenas i kokzonen (3a).
4. Sätt enligt patentkravet 1, kännetecknat därav, att i oxysteget (4) ofullständigt delignifierade fiberaggregat medelst silar och/eller andra massarenare avskiljes frän oxymassan i närvaro av oxylut och att silrejektet tillsammans med medföljande oxylut äterföres tili oxysteget, sä att de där sekundärt utlösta
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7406537A SE394466C (sv) | 1974-05-16 | 1974-05-16 | Sett vid kontinuerlig alkalisk delignifiering av lignocellulosamaterial i tva eller flera steg, varav det sista med syrgas |
| SE7406537 | 1974-05-16 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| FI751443A FI751443A (sv) | 1975-11-17 |
| FI61925B FI61925B (fi) | 1982-06-30 |
| FI61925C true FI61925C (fi) | 1982-10-11 |
Family
ID=20321136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI751443A FI61925C (fi) | 1974-05-16 | 1975-05-15 | Saett vid kontinuerlig alkalisk delignifiering av lignocellulosamaterial i tvao eller flera steg varav det sista med syrgas |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4155806A (sv) |
| JP (1) | JPS6012477B2 (sv) |
| BR (1) | BR7502958A (sv) |
| CA (1) | CA1035104A (sv) |
| FI (1) | FI61925C (sv) |
| SE (1) | SE394466C (sv) |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1127357A (en) * | 1978-05-23 | 1982-07-13 | Makoto Kikuiri | Process for producing alkali pulp |
| SE412771C (sv) * | 1978-07-27 | 1981-07-13 | Obbola Linerboard Ab | Sett vid satsvis kokning av cellulosamaterial for att tillvarata verme- och terpentininnehall i blasanga |
| US4436586A (en) | 1982-01-22 | 1984-03-13 | Kamyr, Inc. | Method of producing kraft pulp using an acid prehydrolysis and pre-extraction |
| US5217574A (en) * | 1989-02-15 | 1993-06-08 | Union Camp Patent Holdings Inc. | Process for oxygen delignifying high consistency pulp by removing and recycling pressate from alkaline pulp |
| US5525195A (en) * | 1989-02-15 | 1996-06-11 | Union Camp Patent Holding, Inc. | Process for high consistency delignification using a low consistency alkali pretreatment |
| US5173153A (en) * | 1991-01-03 | 1992-12-22 | Union Camp Patent Holding, Inc. | Process for enhanced oxygen delignification using high consistency and a split alkali addition |
| US5472572A (en) * | 1990-10-26 | 1995-12-05 | Union Camp Patent Holding, Inc. | Reactor for bleaching high consistency pulp with ozone |
| US5409570A (en) * | 1989-02-15 | 1995-04-25 | Union Camp Patent Holding, Inc. | Process for ozone bleaching of oxygen delignified pulp while conveying the pulp through a reaction zone |
| US5181989A (en) * | 1990-10-26 | 1993-01-26 | Union Camp Patent Holdings, Inc. | Reactor for bleaching high consistency pulp with ozone |
| US5211811A (en) * | 1989-02-15 | 1993-05-18 | Union Camp Patent Holding, Inc. | Process for high consistency oxygen delignification of alkaline treated pulp followed by ozone delignification |
| US5085734A (en) * | 1989-02-15 | 1992-02-04 | Union Camp Patent Holding, Inc. | Methods of high consistency oxygen delignification using a low consistency alkali pretreatment |
| US5188708A (en) * | 1989-02-15 | 1993-02-23 | Union Camp Patent Holding, Inc. | Process for high consistency oxygen delignification followed by ozone relignification |
| US5053108A (en) * | 1989-06-28 | 1991-10-01 | Kamyr Ab | High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
| US5164044A (en) * | 1990-05-17 | 1992-11-17 | Union Camp Patent Holding, Inc. | Environmentally improved process for bleaching lignocellulosic materials with ozone |
| US5441603A (en) * | 1990-05-17 | 1995-08-15 | Union Camp Patent Holding, Inc. | Method for chelation of pulp prior to ozone delignification |
| US5164043A (en) * | 1990-05-17 | 1992-11-17 | Union Camp Patent Holding, Inc. | Environmentally improved process for bleaching lignocellulosic materials with ozone |
| US5174861A (en) * | 1990-10-26 | 1992-12-29 | Union Camp Patent Holdings, Inc. | Method of bleaching high consistency pulp with ozone |
| US5520783A (en) * | 1990-10-26 | 1996-05-28 | Union Camp Patent Holding, Inc. | Apparatus for bleaching high consistency pulp with ozone |
| CA2068981C (en) * | 1991-05-24 | 1996-08-27 | Michael A. Pikulin | Two stage pulp bleaching reactor |
| US5554259A (en) * | 1993-10-01 | 1996-09-10 | Union Camp Patent Holdings, Inc. | Reduction of salt scale precipitation by control of process stream Ph and salt concentration |
| US5736004A (en) * | 1995-03-03 | 1998-04-07 | Union Camp Patent Holding, Inc. | Control scheme for rapid pulp delignification and bleaching |
| US5672247A (en) * | 1995-03-03 | 1997-09-30 | Union Camp Patent Holding, Inc. | Control scheme for rapid pulp delignification and bleaching |
| US5728265A (en) * | 1995-06-12 | 1998-03-17 | Henkel Corporation | Process for enhancing white liquor penetration into wood chips by contacting the chips with a mixture of the white liquor and a polymethylalkyl siloxane |
| US7815876B2 (en) | 2006-11-03 | 2010-10-19 | Olson David A | Reactor pump for catalyzed hydrolytic splitting of cellulose |
| US7815741B2 (en) | 2006-11-03 | 2010-10-19 | Olson David A | Reactor pump for catalyzed hydrolytic splitting of cellulose |
| US20110281298A1 (en) * | 2010-05-11 | 2011-11-17 | Andritz Inc. | Method and apparatus to extracted and reduce dissolved hemi-cellulosic solids in biomass following pre-hydrolysis |
| SE539501C2 (sv) * | 2014-10-31 | 2017-10-03 | Valmet Oy | Method and arrangement for discharge dilution |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB945957A (en) * | 1960-02-08 | 1964-01-08 | Ass Pulp & Paper Mills | Continuous pulping process |
| US3413189A (en) * | 1964-01-29 | 1968-11-26 | Kamyr Ab | Method of performing hydrolysis and alkalic digestion of cellulosic fiber material with prevention of lignin precipitation |
| US3679543A (en) * | 1970-08-18 | 1972-07-25 | Calgon Corp | Controlling the cooking process in pulp digestion by differential conductivity measurements |
| SE360128C (sv) * | 1970-08-25 | 1983-10-31 | Mo Och Domsjoe Ab | Sett att bleka cellulosamassa med en syreinnehallande gas i nervaro av alkali |
| US3830688A (en) * | 1970-10-23 | 1974-08-20 | Skogsaegarnas Ind Ab | Method of reducing the discharge of waste products from pulp mills |
| SE373397C (sv) * | 1972-03-30 | 1984-02-06 | Mo Och Domsjoe Ab | Sett att forbettra blekningsforloppet vid bleknig av cellulosamassa med en syre innehallande gas |
| US3832276A (en) * | 1973-03-07 | 1974-08-27 | Int Paper Co | Delignification and bleaching of a cellulose pulp slurry with oxygen |
-
1974
- 1974-05-16 SE SE7406537A patent/SE394466C/sv not_active IP Right Cessation
-
1975
- 1975-05-02 CA CA226,135A patent/CA1035104A/en not_active Expired
- 1975-05-06 US US05/574,908 patent/US4155806A/en not_active Expired - Lifetime
- 1975-05-14 BR BR3763/75A patent/BR7502958A/pt unknown
- 1975-05-15 FI FI751443A patent/FI61925C/fi not_active IP Right Cessation
- 1975-05-16 JP JP50058466A patent/JPS6012477B2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FI751443A (sv) | 1975-11-17 |
| BR7502958A (pt) | 1976-03-23 |
| SE394466B (sv) | 1977-06-27 |
| SE7406537L (sv) | 1975-11-17 |
| FI61925B (fi) | 1982-06-30 |
| JPS6012477B2 (ja) | 1985-04-01 |
| SE394466C (sv) | 1986-06-23 |
| US4155806A (en) | 1979-05-22 |
| JPS5129501A (en) | 1976-03-12 |
| CA1035104A (en) | 1978-07-25 |
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