FI953343A - Process for pre-treatment of pulp to be bleached with peroxide - Google Patents

Process for pre-treatment of pulp to be bleached with peroxide Download PDF

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Publication number
FI953343A
FI953343A FI953343A FI953343A FI953343A FI 953343 A FI953343 A FI 953343A FI 953343 A FI953343 A FI 953343A FI 953343 A FI953343 A FI 953343A FI 953343 A FI953343 A FI 953343A
Authority
FI
Finland
Prior art keywords
pulp
peroxide
tower
bleached
acid
Prior art date
Application number
FI953343A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI103819B (en
FI953343A0 (en
FI103819B1 (en
Inventor
Kaj Henricson
Olavi Pikka
Original Assignee
Ahlstroem Oy
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
Priority claimed from FI950749A external-priority patent/FI103817B1/en
Application filed by Ahlstroem Oy filed Critical Ahlstroem Oy
Publication of FI953343A0 publication Critical patent/FI953343A0/en
Priority to CA002211223A priority Critical patent/CA2211223C/en
Priority to EP96902301A priority patent/EP0858526A1/en
Priority to US08/875,424 priority patent/US6736934B1/en
Priority to PCT/FI1996/000090 priority patent/WO1996025552A1/en
Publication of FI953343A publication Critical patent/FI953343A/en
Application granted granted Critical
Publication of FI103819B publication Critical patent/FI103819B/en
Publication of FI103819B1 publication Critical patent/FI103819B1/en

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Abstract

The present invention relates to a process for pretreating pulp, which is to be bleached with peroxide, by treating it with acid and by chelating. In particular, the purpose of the invention is to render more efficient and at the same time simplify, the pretreatment which the peroxide bleaching requires. The process according to the invention is characterized in that the pulp is fed, at a consistency of 8-20%, into a pressurized acid tower 14 in which the pressure is 0-20 bar, preferably 1-10 bar and the temperature is 75-130 degree C, the pulp is treated in the acid tower 14 for 20-240 minutes, in order to decrease the kappa number and improve the bleachability, at a pH of 2-6, preferably at 3-4, the pulp is conveyed from the acid tower 14 to the chelating tower 24, the pulp is treated with complexing agent for at least 10-60 minutes at a pH of 4-9, preferably at 5-6, and the pulp is washed and/or pressed. <IMAGE>
FI953343A 1995-02-17 1995-07-06 Process for pretreating pulp which is to be bleached with peroxide FI103819B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002211223A CA2211223C (en) 1995-02-17 1996-02-16 Method of pretreating pulp to be bleached with peroxide
EP96902301A EP0858526A1 (en) 1995-02-17 1996-02-16 Method of pretreating pulp to be bleached with peroxide
US08/875,424 US6736934B1 (en) 1995-02-17 1996-02-16 Method of pretreating pulp in an acid tower prior to bleaching with peroxide
PCT/FI1996/000090 WO1996025552A1 (en) 1995-02-17 1996-02-16 Method of pretreating pulp to be bleached with peroxide

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI950749A FI103817B1 (en) 1995-02-17 1995-02-17 Process for pretreating pulp which is to be bleached with peroxide
FI950749 1995-02-17
SE9502087 1995-06-07
SE9502087A SE516688E (en) 1995-02-17 1995-06-07 Treatment of pulp before peroxide bleaching with acid and complexing agents

Publications (4)

Publication Number Publication Date
FI953343A0 FI953343A0 (en) 1995-07-06
FI953343A true FI953343A (en) 1996-08-18
FI103819B FI103819B (en) 1999-09-30
FI103819B1 FI103819B1 (en) 1999-09-30

Family

ID=26159918

Family Applications (1)

Application Number Title Priority Date Filing Date
FI953343A FI103819B1 (en) 1995-02-17 1995-07-06 Process for pretreating pulp which is to be bleached with peroxide

Country Status (1)

Country Link
FI (1) FI103819B1 (en)

Also Published As

Publication number Publication date
FI103819B (en) 1999-09-30
FI953343A0 (en) 1995-07-06
FI103819B1 (en) 1999-09-30

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Owner name: AHLSTROM MACHINERY OY