GB1170686A - A process for Bleaching Cellulose Pulp and a Pulp Bleached according to the process - Google Patents
A process for Bleaching Cellulose Pulp and a Pulp Bleached according to the processInfo
- Publication number
- GB1170686A GB1170686A GB5361/67A GB536167A GB1170686A GB 1170686 A GB1170686 A GB 1170686A GB 5361/67 A GB5361/67 A GB 5361/67A GB 536167 A GB536167 A GB 536167A GB 1170686 A GB1170686 A GB 1170686A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulp
- bleaching
- naoh
- bleached
- chlorine
- 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
- 238000004061 bleaching Methods 0.000 title abstract 7
- 238000000034 method Methods 0.000 title abstract 4
- 229920002678 cellulose Polymers 0.000 title abstract 2
- 239000001913 cellulose Substances 0.000 title abstract 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract 15
- 239000000460 chlorine Substances 0.000 abstract 7
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract 3
- 229910052801 chlorine Inorganic materials 0.000 abstract 3
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 abstract 2
- 229920005610 lignin Polymers 0.000 abstract 2
- -1 C10 2 Chemical compound 0.000 abstract 1
- 239000004155 Chlorine dioxide Substances 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 1
- 235000019398 chlorine dioxide Nutrition 0.000 abstract 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 abstract 1
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 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
- D21C9/12—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
Abstract
1,170,686. Bleaching pulp. STORA KOPPARBERGS BERGSLAGS A.B. 3, Feb., 1967 [25 Feb., 1966], No. 5361/67. Heading D1P. In a process for bleaching cellulose pulp in a sequence of bleaching stages the prebleached pulp from which a major proportion of the lignin has been removed in an introductory bleaching process is subjected to a treatment at pulp concentrations of 5% or more by weight with chlorine in amounts exceeding those capable of reacting with the lignin in the pulp during the treatment period. The pulp may be sulphite pulp bleached in five stages according to the bleaching sequence Cl 2 , NaOH, Cl 2 +C10 2 , NaOH, C10 2 or sulphate pulp bleached in seven stages according to the bleaching sequence Cl 2 , NaOH, Cl 2 +C10 2 , NaOH, C10 2 , NaOH, C10 2 , the treatment of the pulp with excess chlorine being effected at the third stage in either case. The pulp may be bleached at this stage for 2-6 hours at a temperature below 35C. and the pulp may contain 0.5-2 grams of chlorine dioxide per kilogram of pulp calculated as active chlorine.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE2506/66A SE313985B (en) | 1966-02-25 | 1966-02-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1170686A true GB1170686A (en) | 1969-11-12 |
Family
ID=20260076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5361/67A Expired GB1170686A (en) | 1966-02-25 | 1967-02-03 | A process for Bleaching Cellulose Pulp and a Pulp Bleached according to the process |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3560330A (en) |
| FI (1) | FI48367C (en) |
| GB (1) | GB1170686A (en) |
| SE (1) | SE313985B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA989112A (en) * | 1972-05-30 | 1976-05-18 | Pulp And Paper Research Institute Of Canada | Bleaching of textiles with chlorine monoxide |
| US4255013A (en) * | 1979-05-17 | 1981-03-10 | John E. McNair | Rifle scope having compensation for elevation and drift |
| SE458209B (en) * | 1987-06-04 | 1989-03-06 | Nils Bertil Carnoe | SET TO REDUCE DANGEROUS CHLORPHENOL COMPOUNDS BY CHLOROSAMASSA |
-
1966
- 1966-02-25 SE SE2506/66A patent/SE313985B/xx unknown
-
1967
- 1967-02-03 GB GB5361/67A patent/GB1170686A/en not_active Expired
- 1967-02-03 US US613733A patent/US3560330A/en not_active Expired - Lifetime
- 1967-02-15 FI FI670438A patent/FI48367C/en active
Also Published As
| Publication number | Publication date |
|---|---|
| FI48367B (en) | 1974-05-31 |
| SE313985B (en) | 1969-08-25 |
| US3560330A (en) | 1971-02-02 |
| FI48367C (en) | 1974-09-10 |
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