FI59434C - Delignifiering och blekning av cellulosa med syre - Google Patents
Delignifiering och blekning av cellulosa med syre Download PDFInfo
- Publication number
- FI59434C FI59434C FI649/74A FI64974A FI59434C FI 59434 C FI59434 C FI 59434C FI 649/74 A FI649/74 A FI 649/74A FI 64974 A FI64974 A FI 64974A FI 59434 C FI59434 C FI 59434C
- Authority
- FI
- Finland
- Prior art keywords
- slurry
- bleaching
- tower
- pressure
- pulp
- Prior art date
Links
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
- D21C9/1068—Bleaching ; Apparatus therefor with O2
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Cereal-Derived Products (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
Claims (15)
1. Kontinuerligt förfarande för blekning och delignifiering av cellulosa, varvid framställes en massauppslamning med en koncentra-tion om högst 10 % i alkalisk lösning och denna uppslamning be-handlas med syre vid förhöjd temperatur och vid ett begynnelse-tryck som är över atmosfärstryck, kännetecknat av, att syre loses i uppslamningen och dispergeras grundligt i denna sä att inga agglomererande bubblor uppstär, att uppslamningen utsättes för ett begynnelsetryck, som är mindre än 9 atmosfärer, varefter trycket smäningom sänkes utan att uppslamningen undergär nägon hu-vudsaklig omröring sä, att en tryckgradient om ca 1-10 atmosfärer erhälles mellan begynnelsetrycket och det slutliga trycket.
2. Förfarande enligt patentkravet 1,kännetecknat av att uppslamningen kontinuerligt införes i den nedre delen av ett vertikalt längsträckt torn, att uppslamningen ledes uppät genom tornet utan att den undergär nägon huvudsaklig omröring, att det uppehälles en tryckgradient om 1-10 atmosfärer mellan uppslamning-ens införselpunkt i tornets nedre del och den punkt i tornets övre del vid vilken uppslamningen uttas, och att behandlad uppslamning kontinuerligt uttas ur tornets övre del.
3. Förfarande enligt patentkravet 2,kännetecknat av att huvudsakligen ingen olöst syra föreligger i uppslamningen dä denna införes i tornet.
4. Förfarande enligt patentkravet 2,kännetecknat av att den syrsatta uppslamningen som införes i tornet är fri frän
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US33886273 | 1973-03-07 | ||
US00338862A US3832276A (en) | 1973-03-07 | 1973-03-07 | Delignification and bleaching of a cellulose pulp slurry with oxygen |
Publications (2)
Publication Number | Publication Date |
---|---|
FI59434B FI59434B (fi) | 1981-04-30 |
FI59434C true FI59434C (fi) | 1983-07-04 |
Family
ID=23326465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI649/74A FI59434C (fi) | 1973-03-07 | 1974-03-05 | Delignifiering och blekning av cellulosa med syre |
Country Status (14)
Country | Link |
---|---|
US (1) | US3832276A (sv) |
JP (1) | JPS5747798B2 (sv) |
AR (1) | AR202919A1 (sv) |
BR (1) | BR7401573D0 (sv) |
CA (1) | CA1007807A (sv) |
DE (1) | DE2410934C2 (sv) |
FI (1) | FI59434C (sv) |
FR (1) | FR2220620B1 (sv) |
GB (1) | GB1445276A (sv) |
IT (1) | IT1011546B (sv) |
NO (1) | NO144930C (sv) |
PH (1) | PH10177A (sv) |
SE (1) | SE397983B (sv) |
ZA (1) | ZA741287B (sv) |
Families Citing this family (49)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI48764C (sv) * | 1973-05-30 | 1977-07-26 | Ahlstroem Oy | Förfarande och anordning för blekning av cellulosamassa med molekylärt syre. |
US4089737A (en) * | 1974-02-18 | 1978-05-16 | Toyo Pulp Company, Ltd. | Delignification of cellulosic material with an alkaline aqueous medium containing oxygen dissolved therein |
SE394466C (sv) * | 1974-05-16 | 1986-06-23 | Mannbro Systems Handelsbolag | Sett vid kontinuerlig alkalisk delignifiering av lignocellulosamaterial i tva eller flera steg, varav det sista med syrgas |
US3951733A (en) * | 1974-11-06 | 1976-04-20 | International Paper Company | Delignification and bleaching of wood pulp with oxygen |
US4002526A (en) * | 1975-10-10 | 1977-01-11 | International Paper Company | Oxygen-alkali delignification of low consistency wood pulp |
AU3102077A (en) * | 1976-12-01 | 1979-06-07 | New Zealand Dev Finance | Treating lignocellulosic or cellulosic pulp |
US4216054A (en) * | 1977-09-26 | 1980-08-05 | Weyerhaeuser Company | Low-consistency ozone delignification |
US4198266A (en) * | 1977-10-12 | 1980-04-15 | Airco, Inc. | Oxygen delignification of wood pulp |
US4209359A (en) * | 1978-10-23 | 1980-06-24 | International Paper Company | Process for removing residual oxygen from oxygen-bleached pulp |
US4259150A (en) * | 1978-12-18 | 1981-03-31 | Kamyr Inc. | Plural stage mixing and thickening oxygen bleaching process |
SE462919B (sv) * | 1979-05-11 | 1990-09-17 | Sunds Defibrator Ind Ab | Saett att genomfoera alkaliextraktion av cellulosamassa i naervaro av syre |
US4295927A (en) * | 1979-06-15 | 1981-10-20 | Weyerhaeuser Company | Method and apparatus for treating pulp with oxygen and storing the treated pulp |
US4295925A (en) * | 1979-06-15 | 1981-10-20 | Weyerhaeuser Company | Treating pulp with oxygen |
US4295926A (en) * | 1979-06-15 | 1981-10-20 | Weyerhaeuser Company | Method and apparatus for treating pulp with oxygen |
US4294654A (en) * | 1980-03-21 | 1981-10-13 | International Paper Company | Delignification and bleaching of lignocellulosic pulp via photo-oxygenation |
SE421019B (sv) * | 1980-08-26 | 1981-11-16 | Kamyr Ab | Forfarande for kemikaliereglering vid behandling av en substans, speciellt massa, med gas |
US4384920A (en) * | 1981-04-06 | 1983-05-24 | The Black Clawson Company | Method and apparatus for oxygen delignification |
FI67241B (fi) * | 1981-06-10 | 1984-10-31 | Aga Ab | Saett foer blekning av cellulosahaltiga material |
BR8109039A (pt) * | 1981-09-04 | 1983-09-06 | Weyerhaeuser Co | Tratamento de polpa com oxigenio |
BR8109040A (pt) * | 1981-09-04 | 1983-09-06 | Weyerhaeuser Co | Tratamento de polpa com oxigenio |
DE3207157C1 (de) * | 1982-02-27 | 1983-06-09 | Degussa Ag, 6000 Frankfurt | Verfahren zur Herstellung von halbgebleichten Zellstoffen |
US4684442A (en) * | 1984-03-29 | 1987-08-04 | Weyerhaeuser Company | Oxygen reactor deaeration tank and system |
FR2566015B1 (fr) * | 1984-06-15 | 1986-08-29 | Centre Tech Ind Papier | Procede de blanchiment de pate mecanique par le peroxyde d'hydrogene |
FI71178C (sv) * | 1984-11-08 | 1988-05-18 | Rauma Repola Oy | Förfarande för reglering av syreblekningsprocess |
US4568420B1 (en) * | 1984-12-03 | 1999-03-02 | Int Paper Co | Multi-stage bleaching process including an enhanced oxidative extraction stage |
EP0215781B1 (en) * | 1985-04-01 | 1990-06-27 | Weyerhaeuser Company | A deaeration tank and installation using the tank |
US4886577A (en) * | 1985-05-03 | 1989-12-12 | Kamyr, Inc. | Method and apparatus for mixing oxygen gas with medium consistency pulp in a pump discharge |
US4978426A (en) * | 1987-02-24 | 1990-12-18 | Westvaco Corporation | Production of high strength linerboard with oxygen and alkali |
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 |
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 |
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 |
US5472572A (en) * | 1990-10-26 | 1995-12-05 | Union Camp Patent Holding, Inc. | Reactor for bleaching high consistency pulp with ozone |
US5525195A (en) * | 1989-02-15 | 1996-06-11 | Union Camp Patent Holding, Inc. | Process for high consistency delignification using a low consistency alkali pretreatment |
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 |
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 |
US5188708A (en) * | 1989-02-15 | 1993-02-23 | Union Camp Patent Holding, Inc. | Process for high consistency oxygen delignification followed by ozone relignification |
FI89516B (fi) * | 1989-05-10 | 1993-06-30 | Ahlstroem Oy | Foerfarande foer blekning av cellulosamassa med otson |
WO1991000386A1 (en) * | 1989-06-30 | 1991-01-10 | Nekoosa Papers, Inc. | A method for bleaching kraft pulp with a mixture of oxygen and peroxide |
US5164044A (en) * | 1990-05-17 | 1992-11-17 | Union Camp Patent Holding, Inc. | Environmentally improved process for bleaching lignocellulosic materials with ozone |
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 |
FI922279A (fi) * | 1991-05-24 | 1992-11-25 | Union Camp Patent Holding | Tvaostegsreaktor foer blekning av massa |
CA2082557C (en) * | 1992-02-24 | 1997-03-11 | Charles W. Hankins | Integrated pulping process of waste paper yielding tissue-grade paper fibers |
US5387317A (en) * | 1993-01-28 | 1995-02-07 | The Mead Corporation | Oxygen/ozone/peracetic aicd delignification and bleaching of cellulosic pulps |
US6340409B1 (en) * | 1993-04-29 | 2002-01-22 | Lewis Donald Shackford | Method for multistage bleaching using gaseous reagent in the first stage with controlled gas release |
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 |
US7812153B2 (en) * | 2004-03-11 | 2010-10-12 | Rayonier Products And Financial Services Company | Process for manufacturing high purity xylose |
-
1973
- 1973-03-07 US US00338862A patent/US3832276A/en not_active Expired - Lifetime
-
1974
- 1974-02-12 CA CA192,339A patent/CA1007807A/en not_active Expired
- 1974-02-27 ZA ZA00741287A patent/ZA741287B/xx unknown
- 1974-02-28 GB GB921874A patent/GB1445276A/en not_active Expired
- 1974-03-05 BR BR1573/74A patent/BR7401573D0/pt unknown
- 1974-03-05 FI FI649/74A patent/FI59434C/fi active
- 1974-03-06 SE SE7402968A patent/SE397983B/sv not_active IP Right Cessation
- 1974-03-06 NO NO740795A patent/NO144930C/no unknown
- 1974-03-07 FR FR7407858A patent/FR2220620B1/fr not_active Expired
- 1974-03-07 PH PH15590*A patent/PH10177A/en unknown
- 1974-03-07 JP JP49026701A patent/JPS5747798B2/ja not_active Expired
- 1974-03-07 IT IT67618/74A patent/IT1011546B/it active
- 1974-03-07 DE DE2410934A patent/DE2410934C2/de not_active Expired
-
1975
- 1975-01-01 AR AR20291975D patent/AR202919A1/es active
Also Published As
Publication number | Publication date |
---|---|
AR202919A1 (es) | 1975-07-31 |
NO740795L (no) | 1974-09-10 |
FI59434B (fi) | 1981-04-30 |
AU6602374A (en) | 1975-08-28 |
US3832276A (en) | 1974-08-27 |
JPS5747798B2 (sv) | 1982-10-12 |
NO144930B (no) | 1981-08-31 |
ZA741287B (en) | 1975-02-26 |
JPS5024503A (sv) | 1975-03-15 |
DE2410934C2 (de) | 1983-12-01 |
PH10177A (en) | 1976-09-16 |
CA1007807A (en) | 1977-04-05 |
FR2220620A1 (sv) | 1974-10-04 |
NO144930C (no) | 1981-12-09 |
GB1445276A (en) | 1976-08-11 |
DE2410934A1 (de) | 1974-09-19 |
SE397983B (sv) | 1977-11-28 |
IT1011546B (it) | 1977-02-10 |
FR2220620B1 (sv) | 1978-04-21 |
BR7401573D0 (pt) | 1974-11-05 |
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