PT83649A - PROCESS FOR WHITENING CHEMICAL PAPER PULP - Google Patents
PROCESS FOR WHITENING CHEMICAL PAPER PULPInfo
- Publication number
- PT83649A PT83649A PT83649A PT8364986A PT83649A PT 83649 A PT83649 A PT 83649A PT 83649 A PT83649 A PT 83649A PT 8364986 A PT8364986 A PT 8364986A PT 83649 A PT83649 A PT 83649A
- Authority
- PT
- Portugal
- Prior art keywords
- pulp
- alkaline extraction
- treatment
- paper pulp
- chlorine dioxide
- 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
- D21C9/1026—Other features in bleaching processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Detergent Compositions (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
1. Process for bleaching chemical papermaking pulps in a bleaching sequence including, in succession, a treatment of the pulp by means of chlorine and chlorine dioxide acting in a single bath, a first alkaline extraction by means of sodium hydroxide, a treatment of the pulp by means of chlorine dioxide, a second alkaline extraction by means of sodium hydroxide and again a treatment of the pulp by means of chlorine dioxide, characterized in that the pulp is subjected at the same time to the action of oxygen during the first alkaline extraction and to the action of hydrogen peroxide during the second alkaline extraction.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8516332A FR2589494B1 (en) | 1985-10-30 | 1985-10-30 | PROCESS FOR BLEACHING CHEMICAL PAPER PULP |
Publications (2)
Publication Number | Publication Date |
---|---|
PT83649A true PT83649A (en) | 1986-11-01 |
PT83649B PT83649B (en) | 1989-05-31 |
Family
ID=9324477
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PT83649A PT83649B (en) | 1985-10-30 | 1986-10-29 | PROCESS FOR THE WHITING OF QIMICAS PAPER PASTES |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0222674B1 (en) |
JP (1) | JPS62141188A (en) |
AT (1) | ATE48291T1 (en) |
AU (1) | AU603556B2 (en) |
DE (2) | DE3667184D1 (en) |
ES (1) | ES2000019B3 (en) |
FI (1) | FI85294B (en) |
FR (1) | FR2589494B1 (en) |
NO (1) | NO864319L (en) |
PT (1) | PT83649B (en) |
ZA (1) | ZA868275B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4031597A1 (en) * | 1990-10-05 | 1992-04-09 | Sueddeutsche Kalkstickstoff | METHOD FOR LOW-CHLORINE BLEACHING AND DELIGNIFICATION OF CELLULAR |
US6569284B1 (en) * | 1996-09-24 | 2003-05-27 | International Paper Company | Elemental-chlorine-free bleaching process having an initial Eo or Eop stage |
FR3062138B1 (en) * | 2017-01-23 | 2019-06-07 | Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses | PROCESS FOR WHITENING A PAPER PULP |
-
1985
- 1985-10-30 FR FR8516332A patent/FR2589494B1/en not_active Expired
-
1986
- 1986-10-28 AT AT86420266T patent/ATE48291T1/en not_active IP Right Cessation
- 1986-10-28 EP EP86420266A patent/EP0222674B1/en not_active Expired
- 1986-10-28 ES ES86420266T patent/ES2000019B3/en not_active Expired - Lifetime
- 1986-10-28 DE DE8686420266T patent/DE3667184D1/en not_active Revoked
- 1986-10-28 DE DE198686420266T patent/DE222674T1/en active Pending
- 1986-10-29 PT PT83649A patent/PT83649B/en not_active IP Right Cessation
- 1986-10-29 NO NO864319A patent/NO864319L/en unknown
- 1986-10-29 AU AU64492/86A patent/AU603556B2/en not_active Ceased
- 1986-10-29 FI FI864411A patent/FI85294B/en not_active Application Discontinuation
- 1986-10-30 JP JP61259562A patent/JPS62141188A/en active Granted
- 1986-10-30 ZA ZA868275A patent/ZA868275B/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP0222674B1 (en) | 1989-11-29 |
PT83649B (en) | 1989-05-31 |
DE222674T1 (en) | 1987-10-15 |
AU6449286A (en) | 1987-05-07 |
EP0222674A1 (en) | 1987-05-20 |
JPS62141188A (en) | 1987-06-24 |
ES2000019B3 (en) | 1990-03-16 |
NO864319D0 (en) | 1986-10-29 |
FR2589494A1 (en) | 1987-05-07 |
JPH0116958B2 (en) | 1989-03-28 |
FI864411A (en) | 1987-05-01 |
AU603556B2 (en) | 1990-11-22 |
NO864319L (en) | 1987-05-04 |
DE3667184D1 (en) | 1990-01-04 |
FR2589494B1 (en) | 1988-07-29 |
FI864411A0 (en) | 1986-10-29 |
ZA868275B (en) | 1987-06-24 |
ATE48291T1 (en) | 1989-12-15 |
ES2000019A4 (en) | 1987-09-16 |
FI85294B (en) | 1991-12-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM3A | Annulment or lapse |
Free format text: LAPSE DUE TO NON-PAYMENT OF FEES Effective date: 19940531 |