CA2456538A1 - Method in a paper or pulp process to control the chemical state of the pulp and circulation water system - Google Patents

Method in a paper or pulp process to control the chemical state of the pulp and circulation water system Download PDF

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Publication number
CA2456538A1
CA2456538A1 CA002456538A CA2456538A CA2456538A1 CA 2456538 A1 CA2456538 A1 CA 2456538A1 CA 002456538 A CA002456538 A CA 002456538A CA 2456538 A CA2456538 A CA 2456538A CA 2456538 A1 CA2456538 A1 CA 2456538A1
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CA
Canada
Prior art keywords
pulp
tmp
raw
reject
process water
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002456538A
Other languages
French (fr)
Other versions
CA2456538C (en
Inventor
Sakari Laitinen-Vellonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liqum Paper Oy
Original Assignee
Individual
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 FI20015022A external-priority patent/FI20015022A0/en
Application filed by Individual filed Critical Individual
Publication of CA2456538A1 publication Critical patent/CA2456538A1/en
Application granted granted Critical
Publication of CA2456538C publication Critical patent/CA2456538C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0018—Paper-making control systems controlling the stock preparation
    • 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
    • D21C9/1052—Controlling the process
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/78—Controlling or regulating not limited to any particular process or apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/08—Controlling the addition by measuring pulp properties, e.g. zeta potential, pH

Abstract

The invention relates to a method in a paper or pulp process to control the chemical state of the pulp and circulation water system (10). In the said process one or more raw-material components (PROCESS WATER, TMP, PULP, REJEC T) diluted in liquid, possible fillers, and one or more additives are mixed to form stock. In the method, the elctro-chemical state of at least one raw- material component (PROCESS WATER, TMP, PULP, REJECT) and/or the stock is regulated, without the regulation substantially affecting the pH values of t he raw-material components (PROCESS WATER, TMP, PULP, REJECT) and/or of the sto ck.

Claims (10)

1. A method in a paper or pulp process to control the chemical state of the pulp and circulation water system (10), in which said process one or more raw-material components (PROCESS
WATER, TMP, PULP, REJECT) diluted in liquid, possible fillers, and one or more additives are mixed to form stock, character-ized in that the electrochemical state of at least one raw-material component (PROCESS WATER, TMP, PULP, REJECT) and/or the stock is regulated, without the regulation substantially affecting the pH values of the raw-material components (PROCESS
WATER, TMP, PULP, REJECT) and/or of the stock.
2. A method according to Claim 1, characterized in that the electrochemical state of the raw-material component (PROCESS
WATER, TMP, PULP, REJECT) and/or the stock is regulated by adding a reducing agent, such as sulphur dioxide SO2, to it.
3. A method according to Claim 1 or 2, characterized in that the electrochemical state of the raw-material component (PROCESS WATER, TMP, PULP, REJECT) and/or the stock is regu-lated by adding an oxidizing agent (16, 17), such as hydrogen peroxide H2O2, to it.
4. A method according to Claims 1 - 3, characterized in that the electrochemical state of the raw-material component (PROCESS WATER, TMP, PULP, REJECT) is regulated with the aid of an external current source.
5. A method according to Claims 1 - 4, characterized in that the electrochemical state of the raw-material component (PROCESS WATER, TMP, PULP, REJECT) is regulated with the aid of an external magnetic field.
6. A method according to Claims 1 - 5, characterized in that the electrochemical state of the raw-material component (PROCESS WATER, TMP, PULP, REJECT) is regulated with the aid of a gas.
7. A method according to any of Claims 1 - 6, characterized in that the electrochemical state of the raw-material component (PROCESS WATER, TMP, PULP, REJECT) is determined by measuring the electrochemical state of the dilution liquid in relation to at least one reference electrode.
8. A method according to any of Claims 1 - 7 characterized in that the electrochemical state of the raw-material component (PROCESS WATER, TMP, PULP, REJECT) is regulated before it is fed into the mixing tank (12).
9. A method according to any of Claims 1 - 8, characterized in that the regulation of the electrochemical state is carried out in pulses and/or by changing polarity.
10. A method according to any of Claims 1 - 9, characterized in that at least one raw-material component (PROCESS WATER, TMP, PULP, REJECT) is divided into at least two parts and the electrochemical state of at least one part is regulated before the parts are combined to achieve the desired reactions.
CA2456538A 2001-08-21 2002-08-21 Method in a paper or pulp process to control the chemical state of the pulp and circulation water system Expired - Fee Related CA2456538C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FI20015022A FI20015022A0 (en) 2001-08-21 2001-08-21 Process for making paper or board
FI20015022 2001-08-21
FI20025023 2002-05-17
FI20025023A FI20025023A (en) 2001-08-21 2002-05-17 Process of a paper or cellulose process to check chemical status in a pulp and backwater system
PCT/FI2002/000684 WO2003018908A1 (en) 2001-08-21 2002-08-21 Method in a paper or pulp process to control the chemical state of the pulp and circulation water system

Publications (2)

Publication Number Publication Date
CA2456538A1 true CA2456538A1 (en) 2003-03-06
CA2456538C CA2456538C (en) 2010-04-27

Family

ID=26161249

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2456538A Expired - Fee Related CA2456538C (en) 2001-08-21 2002-08-21 Method in a paper or pulp process to control the chemical state of the pulp and circulation water system

Country Status (7)

Country Link
US (1) US20040238140A1 (en)
EP (1) EP1430178B1 (en)
AT (1) ATE357556T1 (en)
CA (1) CA2456538C (en)
DE (1) DE60219046T2 (en)
FI (1) FI20025023A (en)
WO (1) WO2003018908A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20051096A (en) * 2005-10-31 2007-05-01 Savcor Process Oy Procedure in a wet portion of a paper machine, cardboard machine or other similar forming machine
FI123392B (en) * 2008-02-22 2013-03-28 Upm Kymmene Oyj Method for Precipitation of Calcium Carbonate in a Fibrous Web Process and Fiber Machine Machine Approach
WO2011149797A1 (en) * 2010-05-22 2011-12-01 Eltron Research & Development Inc. Paper dewatering
DE102010041052A1 (en) * 2010-09-20 2012-03-22 Voith Patent Gmbh Method for controlling the formation of a fibrous web
DE102011083709A1 (en) * 2011-09-29 2013-04-04 Voith Patent Gmbh Operating procedure for a stock preparation
EP3508635A4 (en) * 2016-08-31 2020-05-20 Seiko Epson Corporation Sheet manufacturing device, and control method of sheet manufacturing device
JP7211022B2 (en) * 2018-11-07 2023-01-24 セイコーエプソン株式会社 Web manufacturing equipment and sheet manufacturing equipment
WO2020109660A1 (en) * 2018-11-27 2020-06-04 Kemira Oyj Method for estimating the vapor phase corrosion load

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876497A (en) * 1971-11-23 1975-04-08 Sterling Drug Inc Paper mill waste sludge oxidation and product recovery
DE2746179A1 (en) * 1977-10-14 1979-04-19 Bayer Ag METHOD FOR MEASURING THE CHARGE STATE OF SUSPENSIONS AND FOR CONTROLLING THE ADDITION OF ADDITIVES TO SUSPENSIONS
SE442414B (en) * 1981-09-22 1985-12-23 Holmens Bruk Ab SETTING TO REDUCE OR INHIBIT THE MARKING OF PASS OR PAPER IN BACKWATER SYSTEM
ATE26888T1 (en) * 1981-11-09 1987-05-15 Wiggins Teape Group Ltd APPARATUS FOR DETERMINING AN ELECTRICAL CHARACTERISTIC OF A FIBER DISPERSION.
US4752356A (en) * 1985-10-18 1988-06-21 Miami University Papermaking process
US6072309A (en) * 1996-12-13 2000-06-06 Honeywell-Measurex Corporation, Inc. Paper stock zeta potential measurement and control
US6176974B1 (en) * 1997-12-22 2001-01-23 International Paper Company Method for determining electrokinetic properties of papermaking furnish
US5936151A (en) * 1997-12-22 1999-08-10 International Paper Company Method and apparatus for measuring an electrical property of papermaking furnish
US6086716A (en) * 1998-05-11 2000-07-11 Honeywell-Measurex Corporation Wet end control for papermaking machine
FI113089B (en) * 1999-10-06 2004-02-27 Liqum Oy Method for analyzing papermaking process and electrochemical sensor for analyzing liquid
DE60105421T2 (en) * 2000-04-05 2005-09-22 Liqum Oy METHOD AND SYSTEM FOR MONITORING AND ANALYZING A PAPER MANUFACTURING PROCESS
US7056419B2 (en) * 2002-09-30 2006-06-06 American Air Liquide, Inc. Methods for modifying electrical properties of papermaking compositions using carbon dioxide
FI20021901A0 (en) * 2002-10-24 2002-10-24 Liqum Oy Procedure for controlling a process

Also Published As

Publication number Publication date
EP1430178B1 (en) 2007-03-21
EP1430178A1 (en) 2004-06-23
US20040238140A1 (en) 2004-12-02
DE60219046T2 (en) 2007-12-13
FI20025023A (en) 2003-02-22
CA2456538C (en) 2010-04-27
WO2003018908A1 (en) 2003-03-06
DE60219046D1 (en) 2007-05-03
ATE357556T1 (en) 2007-04-15
FI20025023A0 (en) 2002-05-17

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