FI955007A - Method and apparatus for pulp handling - Google Patents

Method and apparatus for pulp handling Download PDF

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Publication number
FI955007A
FI955007A FI955007A FI955007A FI955007A FI 955007 A FI955007 A FI 955007A FI 955007 A FI955007 A FI 955007A FI 955007 A FI955007 A FI 955007A FI 955007 A FI955007 A FI 955007A
Authority
FI
Finland
Prior art keywords
pulp
treatment
degrees celsius
reduce
acid
Prior art date
Application number
FI955007A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI102193B1 (en
FI102193B (en
FI955007A0 (en
Inventor
Kaj Henricson
Original Assignee
Ahlstrom Machinery 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
Application filed by Ahlstrom Machinery Oy filed Critical Ahlstrom Machinery Oy
Publication of FI955007A0 publication Critical patent/FI955007A0/en
Priority to FI955007A priority Critical patent/FI102193B/en
Priority to FI955878A priority patent/FI105701B/en
Priority to FI960214A priority patent/FI104574B/en
Priority to PCT/FI1996/000552 priority patent/WO1997015713A1/en
Priority to AU73016/96A priority patent/AU7301696A/en
Priority to DE69613989T priority patent/DE69613989D1/en
Priority to PT96934841T priority patent/PT856080E/en
Priority to US09/051,678 priority patent/US6306253B2/en
Priority to BR9611258A priority patent/BR9611258A/en
Priority to CA002235325A priority patent/CA2235325C/en
Priority to ES96934841T priority patent/ES2158355T3/en
Priority to EP96934841A priority patent/EP0856080B1/en
Priority to AT96934841T priority patent/ATE203291T1/en
Priority to ZA968823A priority patent/ZA968823B/en
Publication of FI955007A publication Critical patent/FI955007A/en
Application granted granted Critical
Publication of FI102193B1 publication Critical patent/FI102193B1/en
Publication of FI102193B publication Critical patent/FI102193B/en
Priority to US09/793,652 priority patent/US20010020521A1/en

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Abstract

The invention concerns a method for treatment of pulp in conjunction with bleaching. The pulp is first cooked and acid delignified as required to reduce its kappa number to below 24, preferably below 14 and then treated in an acid stage at a pH of 2-5 in the temperature range of 75-130 degrees Celsius to reduce its kappa number by 2 to 9 units. To prevent the pulp's strength value from being significantly reduced, the holding time in the treatment tower of the acid stage, t, min is 30-300 minutes and the treatment temperature T degrees Celsius Tmin < T < Tmax. The invention also refers to an apparatus system intended for use in the method.
FI955007A 1995-10-20 1995-10-20 Method and apparatus for treating pulp FI102193B (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
FI955007A FI102193B (en) 1995-10-20 1995-10-20 Method and apparatus for treating pulp
FI955878A FI105701B (en) 1995-10-20 1995-12-07 Method and arrangement for treatment of pulp
FI960214A FI104574B (en) 1995-10-20 1996-01-07 Method and apparatus for pulping
BR9611258A BR9611258A (en) 1995-10-20 1996-10-18 High temperature acid pulp treatment in connection with bleaching
ES96934841T ES2158355T3 (en) 1995-10-20 1996-10-18 ACID TREATMENT OF PAPER PASTE AT HIGH TEMPERATURE IN RELATION TO WHITENING.
DE69613989T DE69613989D1 (en) 1995-10-20 1996-10-18 HIGH TEMPERATURE ACID TREATMENT OF FIBER WHILE BLEACHING
PT96934841T PT856080E (en) 1995-10-20 1996-10-18 ACUTE TREATMENT OF HIGH TEMPERATURE PAPER PASTE IN COMBINATION WITH BLEACHING
US09/051,678 US6306253B2 (en) 1995-10-20 1996-10-18 Acid treatment of pulp at high temperature prior to chlorine dioxide bleaching
PCT/FI1996/000552 WO1997015713A1 (en) 1995-10-20 1996-10-18 Acid treatment of pulp at high temperature in connection with bleaching
CA002235325A CA2235325C (en) 1995-10-20 1996-10-18 Acid treatment of pulp at high temperature in connection with bleaching
AU73016/96A AU7301696A (en) 1995-10-20 1996-10-18 Acid treatment of pulp at high temperature in connection with bleaching
EP96934841A EP0856080B1 (en) 1995-10-20 1996-10-18 Acid treatment of pulp at high temperature in connection with bleaching
AT96934841T ATE203291T1 (en) 1995-10-20 1996-10-18 HIGH TEMPERATURE ACID TREATMENT OF PULP DURING BLEACHING
ZA968823A ZA968823B (en) 1995-10-20 1996-10-21 Method and apparatus for treatment of pulp
US09/793,652 US20010020521A1 (en) 1995-10-20 2001-02-27 Acid treatment of pulp at high temperature in connection with bleaching

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI955007A FI102193B (en) 1995-10-20 1995-10-20 Method and apparatus for treating pulp
FI955007 1995-10-20

Publications (4)

Publication Number Publication Date
FI955007A0 FI955007A0 (en) 1995-10-20
FI955007A true FI955007A (en) 1997-04-21
FI102193B1 FI102193B1 (en) 1998-10-30
FI102193B FI102193B (en) 1998-10-30

Family

ID=8544226

Family Applications (1)

Application Number Title Priority Date Filing Date
FI955007A FI102193B (en) 1995-10-20 1995-10-20 Method and apparatus for treating pulp

Country Status (2)

Country Link
FI (1) FI102193B (en)
ZA (1) ZA968823B (en)

Also Published As

Publication number Publication date
FI102193B1 (en) 1998-10-30
ZA968823B (en) 1997-06-23
FI102193B (en) 1998-10-30
FI955007A0 (en) 1995-10-20

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Legal Events

Date Code Title Description
GB Transfer or assigment of application

Owner name: AHLSTROM MACHINERY OY