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WO2002039108A1 - Procede de mesure en direct de la turbidite et de la conductivite de suspensions fibreuses - Google Patents

Procede de mesure en direct de la turbidite et de la conductivite de suspensions fibreuses Download PDF

Info

Publication number
WO2002039108A1
WO2002039108A1 PCT/SE2001/002453 SE0102453W WO0239108A1 WO 2002039108 A1 WO2002039108 A1 WO 2002039108A1 SE 0102453 W SE0102453 W SE 0102453W WO 0239108 A1 WO0239108 A1 WO 0239108A1
Authority
WO
WIPO (PCT)
Prior art keywords
turbidity
pulp
filtrate
sample
conductivity
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.)
Ceased
Application number
PCT/SE2001/002453
Other languages
English (en)
Inventor
Sylvain Renaud
Bertil Olsson
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.)
BTG Eclepens SA
BTG Kalle Inventing AB
Original Assignee
BTG Eclepens SA
BTG Kalle Inventing AB
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 BTG Eclepens SA, BTG Kalle Inventing AB filed Critical BTG Eclepens SA
Priority to AU2002214453A priority Critical patent/AU2002214453A1/en
Publication of WO2002039108A1 publication Critical patent/WO2002039108A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/34—Paper
    • G01N33/343—Paper pulp

Definitions

  • the present invention relates to a method for on-line measurement of the turbidity in filtrates from samples extracted from pulp suspension so as to permit a fixative or coagulating control in order to reduce the process variation which is due to the variation of the quality of the filtrates which in a paper mill arises in response to the type of pulp and the water quality as caused by the time of the year, by chemical activation or by the load of the suspension.
  • Turbidity measurement in a pulp filtrate is previously known within the pulp and paper industry. However, this measurement is always made on a laboratory level, since there does not exist any filtrate sampling device which can deliver a filtrate free from colloidal material, i. e. small particles .
  • the filtrate sample extractors now available do always extract the filtrate under processed pressure. Very small particles of filling material or other materials will always be included in the filtrate because the conduit pressure force them out through the sampling device during the first seconds of the filtration process.
  • Filtrates from pulp suspensions are generally used for measurement of turbidity, conductivity, pH and cationic load. Turbidity and cationic load measurements are often made in order to measure the (fixative and coagulating) , efficiency of chemicals. Coagulating or fixative chemicals are generally used to change the supply of colloidal substances from anionic to neutral so that they are joined creating bigger particles which will be extracted from the system together with the fibres .
  • the object of the present invention is to provide a new method admitting collection of filtrates under essentially atmospheric pressure and in such a manner that there is obtained a filtrate substantially without any small particles.
  • This filtrate will now contain only colloidal substances (particles which have at least one dimension within a range from 10 nm to the micro interval) and which have not been neutralised by a chemical reaction and can move freely through a pulp bed.
  • colloidal substances particles which have at least one dimension within a range from 10 nm to the micro interval
  • exemplifying embodiment there is carried out measurement of the turbidity in filtrates from samples extracted from a pulp suspension.
  • the basic principle according to the invention is that at least two filtrates are derived from the same sample in order to eliminate the fine fraction which first leaves the sample as determined by the filter opening area and other mechanical disturbence sources.
  • the sample extracted from the pulp suspension is filtrated at least twice under essentially atmospheric pressure.
  • the purpose of this is to make sure that as a result of the first filtration there will continously be built up a pulp bed in the shape of a cake consisting of fine and big fibres and, when this is applicable, filling agents, after a predetermined time interval or after achievement of a definite volume from the first sample so that there is obtained a first filtrate containing the fine fraction.
  • the first filtrate has been removed out from the measurement chamber used at least one subsequent filtration is carried out in order to create a filtrate substantially comprising colloidal material and which is collected in the measurement chamber for determination of the turbidity and/or the conductivity of the sample.
  • the device or apparatus used in this connection comprises a sample extraction chamber and a measurement chamber.
  • the turbidity and the conductivity of the filtrate is determined.
  • a suspension sample is collected in the sampling chamber at the start of the filtration extraction procedure resulting in that a filter cake is continously created during the filtration on the filter felt forming part of the device.
  • the exact volume is checked with a special instrument also measuring the filtration speed.
  • a cleaning operation is initiated in order to remove all small particles which might have got jammed in the openings of the device during the executed starting filtration process. After this another filtrate is collected for use during the turbidity and/or the conductivity measurement proper.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

La présente invention concerne un procédé permettant de mesurer la turbidité et la conductivité dans un filtrat à partir d'un échantillon prélevé dans une suspension de pâte. Un échantillon prélevé dans la suspension de pâte d'origine est utilisé pour former une base de pâte. Cette base de pâte est formée dans des conditions principalement gravimétriques. Le procédé consiste ensuite à filtrer par diminution de la pression sur la base de pâte de manière à déterminer la turbidité et/ou la conductivité de l'échantillon.
PCT/SE2001/002453 2000-11-08 2001-11-08 Procede de mesure en direct de la turbidite et de la conductivite de suspensions fibreuses Ceased WO2002039108A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002214453A AU2002214453A1 (en) 2000-11-08 2001-11-08 A method for turbidity and conductivity measurements online in fibre suspensions

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0004093A SE0004093D0 (sv) 2000-11-08 2000-11-08 Sätt för turbiditetsmätning on-line i fibersuspensioner
SE0004093-1 2000-11-08

Publications (1)

Publication Number Publication Date
WO2002039108A1 true WO2002039108A1 (fr) 2002-05-16

Family

ID=20281750

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2001/002453 Ceased WO2002039108A1 (fr) 2000-11-08 2001-11-08 Procede de mesure en direct de la turbidite et de la conductivite de suspensions fibreuses

Country Status (3)

Country Link
AU (1) AU2002214453A1 (fr)
SE (1) SE0004093D0 (fr)
WO (1) WO2002039108A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2015059A1 (fr) * 2007-07-09 2009-01-14 Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO Capteur pour fluides avec détection electrique et optique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995035490A2 (fr) * 1994-06-20 1995-12-28 Lenzing Aktiengesellschaft Procede, dispositifs et utilisation de ces dispositifs pour mesurer l'extinction de suspensions troubles
US5964984A (en) * 1995-06-01 1999-10-12 Holmbom; Bjarne Method and apparatus for working up a sample of liquid
US6134952A (en) * 1997-09-18 2000-10-24 Alberta Research Council Inc. Dissolved solid analyzer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995035490A2 (fr) * 1994-06-20 1995-12-28 Lenzing Aktiengesellschaft Procede, dispositifs et utilisation de ces dispositifs pour mesurer l'extinction de suspensions troubles
US5964984A (en) * 1995-06-01 1999-10-12 Holmbom; Bjarne Method and apparatus for working up a sample of liquid
US6134952A (en) * 1997-09-18 2000-10-24 Alberta Research Council Inc. Dissolved solid analyzer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2015059A1 (fr) * 2007-07-09 2009-01-14 Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO Capteur pour fluides avec détection electrique et optique

Also Published As

Publication number Publication date
SE0004093D0 (sv) 2000-11-08
AU2002214453A1 (en) 2002-05-21

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