CA932908A - Cellulosic bleaching process - Google Patents
Cellulosic bleaching processInfo
- Publication number
- CA932908A CA932908A CA944750A CA944750A CA932908A CA 932908 A CA932908 A CA 932908A CA 944750 A CA944750 A CA 944750A CA 944750 A CA944750 A CA 944750A CA 932908 A CA932908 A CA 932908A
- Authority
- CA
- Canada
- Prior art keywords
- bleaching process
- cellulosic
- cellulosic bleaching
- bleaching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
- D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
- D21C9/142—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 in a multistage process involving ClO2/Cl2 exclusively
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US46769765A | 1965-06-28 | 1965-06-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA932908A true CA932908A (en) | 1973-09-04 |
Family
ID=37084838
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA944750A Expired CA932908A (en) | 1965-06-28 | 1965-11-06 | Cellulosic bleaching process |
Country Status (7)
Country | Link |
---|---|
US (1) | US3433702A (en) |
BE (1) | BE699505A (en) |
CA (1) | CA932908A (en) |
DE (1) | DE1594861B2 (en) |
FR (1) | FR1484998A (en) |
GB (1) | GB1145339A (en) |
NO (1) | NO126747B (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1100709A (en) * | 1965-06-25 | 1968-01-24 | Pulp Paper Res Inst | Two-stage purification of fibrous cellulose material |
USRE28777E (en) * | 1969-02-06 | 1976-04-20 | Ethyl Corporation | Refining of vegetable matter and delignification of the refined matter with chlorine dioxide |
US3884752A (en) * | 1973-09-17 | 1975-05-20 | Int Paper Co | Single vessel wood pulp bleaching with chlorine dioxide followed by sodium hypochlorite or alkaline extraction |
US3907632A (en) * | 1973-10-23 | 1975-09-23 | Ppg Industries Inc | Bleaching cellulosic pulps with gaseous chlorine at a pH of 7 to 10 in a multistage bleaching process |
US4081317A (en) * | 1973-12-18 | 1978-03-28 | Hooker Chemicals & Plastics Corporation | Process for the reduction of effluent color from a cellulosic pulp bleaching sequence |
SE391750B (en) * | 1974-03-21 | 1977-02-28 | Kamyr Ab | SEE THAT IN A KERL CONTINUALLY TREAT CELLULOSA MASS WITH CHLORINE |
US4039374A (en) * | 1975-08-29 | 1977-08-02 | Union Camp Corporation | Bleaching of cellulosic pulp fibers with chlorine dioxide in the presence of a vanadium compound |
US4096029A (en) * | 1976-04-26 | 1978-06-20 | The Dow Chemical Company | Cellulosic pulp delignification using an acidic bromine-chlorine mixture |
US4325783A (en) * | 1978-03-30 | 1982-04-20 | Erco Industries Limited | Bleaching procedure using chlorine dioxide and chlorine solutions |
US4259149A (en) * | 1978-05-03 | 1981-03-31 | Hooker Chemicals & Plastics Corp. | Method of reducing waste stream pollutants by the control and separation of waste contaminants from a multi-stage cellulosic bleaching sequence |
US4299653A (en) * | 1979-04-16 | 1981-11-10 | Erco Industries Limited | Method of bleaching pulp with an aqueous solution of chlorine dioxide and chlorine followed by a chlorine solution |
WO1991005910A1 (en) * | 1989-10-19 | 1991-05-02 | North Carolina State University | Chlorine dioxide pulp bleaching process using sequential chlorine addition |
EP0496782B1 (en) * | 1989-10-19 | 1996-03-20 | North Carolina State University | High efficiency chlorine dioxide pulp bleaching process |
US5268075A (en) * | 1989-10-19 | 1993-12-07 | North Carolina State University | High efficiency two-step, high-low pH chlorine dioxide pulp bleaching process |
US5030324A (en) * | 1990-01-29 | 1991-07-09 | Champion International Corporation | Sequential bleaching procedure using chlorine and chlorine dioxide in a first chlorination stage of a multistage bleaching process |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2513788A (en) * | 1947-01-31 | 1950-07-04 | Brown Co | Bleaching of sulfate wood pulp |
BE518419A (en) * | 1952-03-26 | |||
US2903326A (en) * | 1956-10-17 | 1959-09-08 | Pennsalt Chemicals Corp | Improved process for bleaching cellulose pulp using chlorate |
US3020197A (en) * | 1960-08-05 | 1962-02-06 | Allied Chem | Method for production of high brightness high strength wood pulps |
-
1965
- 1965-06-28 US US467697A patent/US3433702A/en not_active Expired - Lifetime
- 1965-11-06 CA CA944750A patent/CA932908A/en not_active Expired
-
1966
- 1966-06-28 GB GB28988/66A patent/GB1145339A/en not_active Expired
- 1966-06-28 DE DE1594861A patent/DE1594861B2/en active Granted
- 1966-06-28 FR FR67213A patent/FR1484998A/en not_active Expired
- 1966-06-28 NO NO00163696A patent/NO126747B/no unknown
-
1967
- 1967-06-05 BE BE699505D patent/BE699505A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
NO126747B (en) | 1973-03-19 |
FR1484998A (en) | 1967-06-16 |
DE1594861A1 (en) | 1972-05-25 |
DE1594861B2 (en) | 1973-10-04 |
DE1594861C3 (en) | 1974-05-09 |
BE699505A (en) | 1967-11-16 |
US3433702A (en) | 1969-03-18 |
GB1145339A (en) | 1969-03-12 |
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