FI970106A0 - Process for bleaching wood pulp by hydrogen peroxide - Google Patents

Process for bleaching wood pulp by hydrogen peroxide

Info

Publication number
FI970106A0
FI970106A0 FI970106A FI970106A FI970106A0 FI 970106 A0 FI970106 A0 FI 970106A0 FI 970106 A FI970106 A FI 970106A FI 970106 A FI970106 A FI 970106A FI 970106 A0 FI970106 A0 FI 970106A0
Authority
FI
Finland
Prior art keywords
pulp
hydrogen peroxide
phase
reaction
residual
Prior art date
Application number
FI970106A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI970106A (en
Inventor
Gustavo L Bottan
Original Assignee
Beloit Technologies Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beloit Technologies Inc filed Critical Beloit Technologies Inc
Publication of FI970106A0 publication Critical patent/FI970106A0/en
Publication of FI970106A publication Critical patent/FI970106A/en

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.
FI970106A 1994-07-11 1997-01-10 Method for bleaching wood pulp using hydrogen peroxide FI970106A (en)

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 (2)

Publication Number Publication Date
FI970106A0 true FI970106A0 (en) 1997-01-10
FI970106A FI970106A (en) 1997-01-10

Family

ID=23044429

Family Applications (1)

Application Number Title Priority Date Filing Date
FI970106A FI970106A (en) 1994-07-11 1997-01-10 Method 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) FI970106A (en)
WO (1) WO1996001922A1 (en)
ZA (1) ZA955190B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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.

Also Published As

Publication number Publication date
BR9508390A (en) 1997-10-28
EP0770158B1 (en) 1998-10-21
CA2194881A1 (en) 1996-01-25
ZA955190B (en) 1996-03-14
JPH09508184A (en) 1997-08-19
WO1996001922A1 (en) 1996-01-25
EP0770158A1 (en) 1997-05-02
FI970106A (en) 1997-01-10
ATE172504T1 (en) 1998-11-15
DE69505536D1 (en) 1998-11-26

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