BR9508390A - Process for bleaching wood pulp using hydrogen peroxide - Google Patents
Process for bleaching wood pulp using hydrogen peroxideInfo
- Publication number
- BR9508390A BR9508390A BR9508390A BR9508390A BR9508390A BR 9508390 A BR9508390 A BR 9508390A BR 9508390 A BR9508390 A BR 9508390A BR 9508390 A BR9508390 A BR 9508390A BR 9508390 A BR9508390 A BR 9508390A
- Authority
- BR
- Brazil
- Prior art keywords
- pulp
- hydrogen peroxide
- phase
- reaction
- residual
- 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
-
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
A method for bleaching wood pulp using a hydrogen peroxide solution as a bleaching agent, utilizes a two phase reaction, viz. a short high temperature phase followed by a longer second phase to consume virtually all the hydrogen peroxide remaining after the short phase. The method includes the steps of introducing pulp (10), at a consistency of 10-18 %, to a mixer (100) in which the pulp is heated to a temperature between 80 and 100 DEG C; adding sufficient sodium hydroxide (15) to bring the pulp to a pH of 9.5-11.5; adding sufficient hydrogen peroxide (35) to provide a peroxide residual after the first reactor column; passing the pulp through a reactor column (400) at a rate providing a reaction time on the column of between 5 to 60 minutes; introducing the pulp to a mixer (500) and reactivating residual hydrogen peroxide by bringing the pulp to a pH of at least 9; and depositing the pulp in a reaction tower (600) and allowing the reaction to proceed for 1-4 hours until a substantial portion of the residual hydrogen peroxide has been consumed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US27355694A | 1994-07-11 | 1994-07-11 | |
| PCT/US1995/008152 WO1996001922A1 (en) | 1994-07-11 | 1995-06-28 | Method for bleaching wood pulp using hydrogen peroxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BR9508390A true BR9508390A (en) | 1997-10-28 |
Family
ID=23044429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BR9508390A BR9508390A (en) | 1994-07-11 | 1995-06-28 | Process for bleaching wood pulp using hydrogen peroxide |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0770158B1 (en) |
| JP (1) | JPH09508184A (en) |
| AT (1) | ATE172504T1 (en) |
| BR (1) | BR9508390A (en) |
| CA (1) | CA2194881A1 (en) |
| DE (1) | DE69505536D1 (en) |
| FI (1) | FI970106A0 (en) |
| WO (1) | WO1996001922A1 (en) |
| ZA (1) | ZA955190B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106758446B (en) * | 2016-11-17 | 2018-03-06 | 鲁洪飞 | A kind of environment friendly pulping process |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3207157C1 (en) * | 1982-02-27 | 1983-06-09 | Degussa Ag, 6000 Frankfurt | Process for the production of semi-bleached cellulose |
| FR2582692B1 (en) * | 1985-05-29 | 1987-12-11 | Atochem | TREATMENT OF CHEMICAL PAPER PULP WITH HYDROGEN PEROXIDE FOR BLEACHING |
| FR2661430B1 (en) * | 1990-04-30 | 1992-07-17 | Atochem | HIGH-YIELD PAPER PULP HYDROGEN PEROXIDE BLEACHING PROCESS. |
-
1995
- 1995-06-22 ZA ZA955190A patent/ZA955190B/en unknown
- 1995-06-28 WO PCT/US1995/008152 patent/WO1996001922A1/en active IP Right Grant
- 1995-06-28 AT AT95925355T patent/ATE172504T1/en not_active IP Right Cessation
- 1995-06-28 JP JP8504332A patent/JPH09508184A/en active Pending
- 1995-06-28 BR BR9508390A patent/BR9508390A/en not_active Application Discontinuation
- 1995-06-28 CA CA002194881A patent/CA2194881A1/en not_active Abandoned
- 1995-06-28 EP EP95925355A patent/EP0770158B1/en not_active Expired - Lifetime
- 1995-06-28 DE DE69505536T patent/DE69505536D1/en not_active Expired - Lifetime
-
1997
- 1997-01-10 FI FI970106A patent/FI970106A0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE69505536D1 (en) | 1998-11-26 |
| WO1996001922A1 (en) | 1996-01-25 |
| EP0770158A1 (en) | 1997-05-02 |
| JPH09508184A (en) | 1997-08-19 |
| ATE172504T1 (en) | 1998-11-15 |
| FI970106A (en) | 1997-01-10 |
| CA2194881A1 (en) | 1996-01-25 |
| EP0770158B1 (en) | 1998-10-21 |
| FI970106A0 (en) | 1997-01-10 |
| ZA955190B (en) | 1996-03-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FF | Decision: intention to grant | ||
| FA11 | Dismissal: dismissal - article 38, par. 2 of industrial property law |