FI862082A0 - TRYCKKLORERING AV MASS OCH INMATNING AV KLOR I FORM AV MYCKET SMAO BUBBLOR. - Google Patents
TRYCKKLORERING AV MASS OCH INMATNING AV KLOR I FORM AV MYCKET SMAO BUBBLOR.Info
- Publication number
- FI862082A0 FI862082A0 FI862082A FI862082A FI862082A0 FI 862082 A0 FI862082 A0 FI 862082A0 FI 862082 A FI862082 A FI 862082A FI 862082 A FI862082 A FI 862082A FI 862082 A0 FI862082 A0 FI 862082A0
- Authority
- FI
- Finland
- Prior art keywords
- mixer
- treatment
- pulp
- chlorine gas
- retention vessel
- 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
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
Abstract
A method and apparatus are provided for increasing the efficiency of treatment of a paper pulp slurry with chlorine gas, such as in the bleaching or delignification of deciduous wood chemical pulps, coniferous wood chemical pulps, and non-wood fibrous chemical pulps. Chlorine gas is intimately mixed with the pulp in a fluidizing mixer (14), the pulp preferably having a consistency of about 7-12%, and then is passed to a retention vessel (20). The discharge of pulp from the mixer to the retention vessel, and from the retention vessel to other treatment structures, is throttled by valves (30, 31) so as to increase the pressure in both the mixer and the retention vessel to above atmospheric, and preferably in the range of about 15-150 psig (1 to 10 bar above atmospheric pressure). The chlorine gas is added to the mixer through one more discs (53) of porous materials having pore sizes in the range of about 5-175 microns, such as porous ceramic or sintered metal discs. The increased pressure during the chlorine treatment, and the introduction of the chlorine gas in the form of minute bubbles, improve the solubility of the chlorine in the pulp slurry and thereby increase the efficiency of treatment. (Figure 1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US74467885A | 1985-06-14 | 1985-06-14 | |
US74467885 | 1985-06-14 |
Publications (4)
Publication Number | Publication Date |
---|---|
FI862082A0 true FI862082A0 (en) | 1986-05-19 |
FI862082A FI862082A (en) | 1986-12-15 |
FI85728B FI85728B (en) | 1992-02-14 |
FI85728C FI85728C (en) | 1992-05-25 |
Family
ID=24993592
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI862082A FI85728C (en) | 1985-06-14 | 1986-05-19 | Pressure chlorination of pulp and input of chlorine in the form of very small bubbles |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0207062B1 (en) |
JP (1) | JPS61289192A (en) |
AT (1) | ATE48452T1 (en) |
BR (1) | BR8602738A (en) |
CA (1) | CA1276408C (en) |
DE (1) | DE3667310D1 (en) |
FI (1) | FI85728C (en) |
NO (1) | NO168123C (en) |
SE (1) | SE466459B (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US56833A (en) * | 1866-07-31 | Improvement in bleaching paper-stock | ||
US1971241A (en) * | 1933-04-01 | 1934-08-21 | Pennsylvania Salt Mfg Co | Method of chlorination |
DE1621684A1 (en) * | 1967-10-04 | 1971-07-08 | Bellmer Geb Kg Maschf | Machine combination for the line section in pulp processing plants |
SE387671B (en) * | 1973-04-27 | 1976-09-13 | Mo Och Domsjoe Ab | COMPACT WHITE BLEACHING, NON-FLUFFAT LIQUID LIGNOCELLULOSE MATERIAL WITH GASY BLEACHING, PREFERABLY ACID GAS |
-
1985
- 1985-10-25 CA CA000493830A patent/CA1276408C/en not_active Expired - Fee Related
-
1986
- 1986-05-19 FI FI862082A patent/FI85728C/en not_active IP Right Cessation
- 1986-05-28 NO NO862116A patent/NO168123C/en unknown
- 1986-06-04 JP JP61128270A patent/JPS61289192A/en active Pending
- 1986-06-06 AT AT86890168T patent/ATE48452T1/en not_active IP Right Cessation
- 1986-06-06 DE DE8686890168T patent/DE3667310D1/en not_active Expired - Fee Related
- 1986-06-06 EP EP86890168A patent/EP0207062B1/en not_active Expired
- 1986-06-10 SE SE8602592A patent/SE466459B/en not_active IP Right Cessation
- 1986-06-11 BR BR8602738A patent/BR8602738A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
JPS61289192A (en) | 1986-12-19 |
EP0207062B1 (en) | 1989-12-06 |
ATE48452T1 (en) | 1989-12-15 |
SE466459B (en) | 1992-02-17 |
NO168123B (en) | 1991-10-07 |
CA1276408C (en) | 1990-11-20 |
FI862082A (en) | 1986-12-15 |
SE8602592L (en) | 1986-12-15 |
NO168123C (en) | 1992-01-15 |
SE8602592D0 (en) | 1986-06-10 |
DE3667310D1 (en) | 1990-01-11 |
FI85728B (en) | 1992-02-14 |
FI85728C (en) | 1992-05-25 |
BR8602738A (en) | 1987-02-10 |
EP0207062A1 (en) | 1986-12-30 |
NO862116L (en) | 1986-12-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FI89516B (en) | Foerfarande Foer blekning av cellulosamassa med Otson | |
RO107715B1 (en) | Celluloses whitening, without chlorine process | |
GB1489520A (en) | Fluffed pulp and a method for producing same | |
DE69108712D1 (en) | Medium consistency pulp ozone bleaching. | |
ATE54475T1 (en) | PROCESSES FOR BLEACHING AND DELIGNIFICATION OF PULP-CONTAINING PRODUCTS. | |
NZ218294A (en) | Dispersing and dissolving of a gas, such as oxygen, or gases in a pulp slurry for use in bleaching the pulp | |
ES8704569A1 (en) | Sulphite pulping process for preparing cellulose pulp from lignocellulosic materials with recovery of the pulping chemicals. | |
FI862082A0 (en) | TRYCKKLORERING AV MASS OCH INMATNING AV KLOR I FORM AV MYCKET SMAO BUBBLOR. | |
ES2000032A6 (en) | Use of ligninolytic enzymes in paper pulp production. | |
DE59007258D1 (en) | Process for bleaching cellulosic materials and plant for carrying out the process. | |
FI62362B (en) | LIGNINAVLAEGSNING OCH BLEKNING AV LIGNOCELLULOSAMASSA MED OZON | |
DE59705632D1 (en) | Process for the production of pulp | |
SE9403227L (en) | Methods for Preparation of Chemistry Thermomechanical Pulp (CTMP) | |
RU2010068C1 (en) | Process for making of unbleached pulp | |
RU92016575A (en) | A METHOD OF ACHIEVING AN IMPROVED DELHINIFICATION SELECTIVITY OF UNCLEARED FIBROUS WEIGHT | |
GB1455399A (en) | Method for digesting wood | |
SU1258929A1 (en) | Pulp composition for making parchment paper | |
CA2150385A1 (en) | Method and apparatus for bleaching pulp | |
Nassar | Electrochemical bleaching- A novel method for bleaching kraft and sulphite pulps. | |
Lincoln et al. | METHOD OF BLEACHING WOOD PULP | |
ES8606557A1 (en) | Process for preparing chemical wood pulps with a view to bleaching. | |
JPS6440692A (en) | Bleaching of old paper pulp by waste gas desulfurizing product | |
RU94007623A (en) | DEVICE FOR PRODUCING WOOD | |
TH9978EX (en) | Two-step process for removing lignin from lignocellulose fibers using first-stage peroxide-enriched oxygen. | |
RO103604B1 (en) | Process of micro-organisms fighting when producing paper |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM | Patent lapsed | ||
MM | Patent lapsed |
Owner name: KAMYR INC. |