EP1949095A2 - Dispositif de mesure d'un potentiel d'ecoulement sur un liquide contenant des solides - Google Patents

Dispositif de mesure d'un potentiel d'ecoulement sur un liquide contenant des solides

Info

Publication number
EP1949095A2
EP1949095A2 EP06840940A EP06840940A EP1949095A2 EP 1949095 A2 EP1949095 A2 EP 1949095A2 EP 06840940 A EP06840940 A EP 06840940A EP 06840940 A EP06840940 A EP 06840940A EP 1949095 A2 EP1949095 A2 EP 1949095A2
Authority
EP
European Patent Office
Prior art keywords
electrode
flow
potential
measuring
filter
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.)
Withdrawn
Application number
EP06840940A
Other languages
German (de)
English (en)
Inventor
Markus Mornhinweg
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 Instruments GmbH
Original Assignee
BTG Instruments GmbH
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 DE200510061639 external-priority patent/DE102005061639B4/de
Application filed by BTG Instruments GmbH filed Critical BTG Instruments GmbH
Publication of EP1949095A2 publication Critical patent/EP1949095A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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 paper pulp

Definitions

  • the invention relates to a device for measuring a flow potential on a liquid containing solids according to claim 1.
  • the zeta potential plays a decisive role in addition to the surface energy.
  • the zeta potential is a measure of ionic attachment processes at the boundary layer and indicates how strongly ions are bound.
  • the zeta potential serves as a parameter for acid-base properties of fiber and powder surfaces.
  • the zeta potential may possibly be neutralized by an accumulation of ions at the interfaces in the interface between the solid surface and the fluid and therefore also serves as a measure of the stability of suspensions and emulsions.
  • the zeta potential of the starting materials is used in particular in microencapsulation processes to optimize the process flow in order to make the most optimal selection of suitable additives for the microencapsulation process and thus to be able to increase the efficiency of the encapsulation process.
  • the measurement of the zeta potential plays a decisive role, in particular in papermaking.
  • synthetic sizing agents such as Alkylketene dimer (AKD) and succinic acid (ASA) used as a hydrophobing agent.
  • the sizing systems often have different zeta potentials and thus different properties, so that the papermaker must weigh which is the optimum sizing agent for his paper machine or for the respective paper product.
  • the zeta potential of the fibers present in the pulp plays a decisive role.
  • the zeta potential of the fibers in the pulp is different in batches, since the composition of the raw materials (waste paper) of the pulp varies constantly. Therefore, particularly in the production of waste paper, the zeta potential of the pulp must be continuously determined in order to be able to add suitable sizing agents and additives.
  • the zeta potential plays a crucial role.
  • the zeta potential is determined by the flow potential method. First, the flow potential and the conductivity of the suspension are measured, from which the zeta potential is subsequently determined.
  • Flow potential method is a physical-surface analytical method for characterizing the electrokinetic properties of solids in contact with aqueous solutions. If a solid is in contact with an aqueous electrolyte solution, then there is a different distribution of the electrical charge at the phase boundary than in the interior of the liquid phase. The accumulation of charge carriers at the phase boundary leads to the formation of an electrochemical double layer: the charge carriers located on a solid surface are compensated by counter ions, which are partly in a rigid arrangement and partly in a diffuse distribution in the liquid. To determine the zeta potential according to the flow potential method, a fluid movement is generated in a measuring cell in which there is a capillary system by a driving pressure.
  • the resulting potential difference is detected by measuring electrodes located at the two ends of the flow channel.
  • the zeta potential is approximately equal to the potential of a boundary between rigid and diffuse layer and can be calculated from the measured flow potential.
  • US Pat. No. 4,535,285 discloses a method for measuring the flow potential within a fiber-containing liquid, wherein a multiplicity of flow paths of the liquid are produced by a filter cake and the flow potential arising via the filter cake is stored as a potential measurement series. The multiplicity of flow paths of the liquid are repeated at a frequency periodically.
  • the known method also has the method step of storing the flow profile as a flow measurement series.
  • the publication discloses a device for measuring the flow potential within the fiber-containing liquid, wherein a multiplicity of flow paths of the liquid are produced by the filter cake and the flow potential arising via the filter cake is stored as a potential measurement series.
  • a flow-through line which is closed by a filter, a flow-generating device for conveying the suspension through the line and for producing the filter cake on the filter and an electrode arrangement for measuring over at least parts of the filter cake electrical potential provided.
  • the conventional device has a flow measuring arrangement for detecting and storing a flow measuring series, a computing device for deriving the Height of the flow potential and a flow device for controlling the flow path.
  • Flow potential within a fluid-containing fluid and a device for measuring a flow potential within a fiber-containing fluid comprises a flow-through conduit, which is closed by a filter; a flow generating means for conveying the suspension through the conduit and for producing the filter cake on the filter; and an electrode assembly for measuring the electrical potential applied across at least portions of the filter cake.
  • a flow measuring arrangement for detecting and storing a flow measuring series; a computing device; and to provide a control device for controlling the flow path.
  • the invention is based on the object of developing a device of the type mentioned in such a way that the reproducibility of the measurement results is improved.
  • this object is achieved in a device for measuring a flow potential on a liquid containing solids having a first electrode means in the flow direction with a first staB shaped electrode and a second electrode means with a second rod-shaped electrode and with a
  • the first electrode is so in a wall of a flow channel of the first electrode means let in that it protrudes maximally with its diameter, preferably with half of its diameter in the flow channel transverse to the flow direction.
  • At least the first electrode has a round cross-section.
  • a round cross section is particularly easy to manufacture.
  • At least the first electrode is preferably made of a drawn wire.
  • pulling wires it is possible in a simple manner to produce a uniform and, above all, very smooth surface.
  • the first and the second electrodes are all preferably produced from a single batch of drawn wire.
  • the first and / or the second electrode are made of platinum-iridium or drawn from a wire consisting of this material.
  • This material offers surprisingly good results, in particular with regard to the constancy of the measurement results or their reproducibility.
  • the first and / or the second electrode preferably have a defined surface roughness.
  • a defined surface roughness for example by blasting and / or etching and / or electropolishing the electrode surfaces.
  • all electrodes exhibit very similar to the same properties within the measuring cells.
  • the filter device preferably comprises a replaceable sieve, so that a slight cleaning possibility is given.
  • the filter device may comprise a paper filter which can be placed on the screen, which is the case in particular when the solids are very small particles.
  • FIG. 1 shows a plan view of a second electrode device
  • FIG. 2 shows a section along the line II-II through the arrangement according to FIG. 1,
  • FIG. 3 shows a plan view of a first electrode device
  • FIG. 4 shows a section along the line IV-IV from FIG. 3,
  • FIG. 5 is a detail view of the section corresponding to the figure 4 and
  • FIG. 6 shows a longitudinal section through a measuring cell with the electrode devices.
  • the measuring cell 10 shown in the figures has a flow channel 11, which tapers in accordance with the drawings to the top. In this tapering direction, the flow channel 11 is flowed through by the sample liquid.
  • the sample liquid first flows through a first electrode device 20, which has a holding frame 22 in which an electrode 21 is mounted. Thereafter, the sample liquid flows through an intermediate piece 12 and a second electrode means 30 with a holding frame 32, in which a second electrode 31 is mounted.
  • the holding frame 22 of the first electrode device is connected via a shoulder 24 with the spacer 12 liquid-tight but separable.
  • the holding frame 32 of the second electrode device 30 is liquid-tightly but separably connected via a shoulder 34 with the intermediate piece 12, wherein at the junction, a filter device 40 is attached, which initially comprises an exchangeable sieve.
  • a filter paper may be placed.
  • the holding frames 22 and 32 of the first electrode means 20 and second electrode means 30 have concentric bores whose walls 23 and 33 are aligned with a wall 13 of the intermediate piece 12 at the transition areas.
  • the first electrode 21 is inserted in such a tangential manner to the wall 23 of the first electrode device 20 or its holding frame 22 that its outer surface is half its (or less) its, as shown in FIG Diameter D protrudes beyond the wall 23 and extends into the flow channel 12.
  • a bore for the first electrode 21 is first introduced into the holding frame 32, before the central bore for forming the wall 23 of the holding frame 22 is introduced. In this way, a precise production in a simple manner possible.
  • the second electrode 31 of the second electrode device 30 is mounted centrally in the holding frame 32, as shown in FIGS. 1 and 2.
  • the special attachment of the first electrode 21 now causes, after use and even during use, solids which are present in the sample liquid, find no place, in particular no undercut, in which they could get stuck.
  • the second electrode 31 is downstream of the filter so that solids do not contact them.
  • the material used for the electrodes 21 and 31 is, in particular, platinum-iridium, with drawn wire in particular being used as semifinished product.
  • the drawing process achieves an extremely uniform surface, so that when several (replaceable) electrode devices 20/30 are produced, the achievable measurement data is only within a very narrow tolerance range. There is also no danger that the surface will be damaged or changed during cleaning because the material is very hard.
  • the shape of the electrodes can also deviate from a circular cross-section, if the above-mentioned criterion of tangential intrusion into the flow channel is ensured. Furthermore, a plurality of first electrodes 21 can be used in the holding frame 22, if this is desired for metrological reasons.

Abstract

L'invention concerne un dispositif de mesure d'un potentiel d'écoulement sur un liquide contenant des solides, comportant un premier système d'électrode vu dans le sens d'écoulement, présentant une première électrode en tige, un deuxième système d'électrode présentant une deuxième électrode en tige, et un dispositif de filtrage disposé entre les systèmes d'électrode. Pour améliorer la reproductibilité et la stabilité du résultat de mesure, la première électrode est intégrée à la paroi d'un canal d'écoulement du premier système d'électrode de telle manière que celle-ci fait saillie avec la moitié de son diamètre au maximum dans le canal d'écoulement, perpendiculairement à la direction d'écoulement.
EP06840940A 2005-11-17 2006-11-14 Dispositif de mesure d'un potentiel d'ecoulement sur un liquide contenant des solides Withdrawn EP1949095A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005054934 2005-11-17
DE200510061639 DE102005061639B4 (de) 2005-12-22 2005-12-22 Vorrichtung zur Messung eines Strömungspotentials an einer Feststoffe enthaltenden Flüssigkeit
PCT/EP2006/010911 WO2007057160A2 (fr) 2005-11-17 2006-11-14 Dispositif de mesure d'un potentiel d'ecoulement sur un liquide contenant des solides

Publications (1)

Publication Number Publication Date
EP1949095A2 true EP1949095A2 (fr) 2008-07-30

Family

ID=37945432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06840940A Withdrawn EP1949095A2 (fr) 2005-11-17 2006-11-14 Dispositif de mesure d'un potentiel d'ecoulement sur un liquide contenant des solides

Country Status (3)

Country Link
US (1) US20080315863A1 (fr)
EP (1) EP1949095A2 (fr)
WO (1) WO2007057160A2 (fr)

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NL2006363C2 (en) * 2011-03-09 2012-09-11 Adviesburo Magendans B V The determination of an electrical characteristic of a particles containing liquid.
AU2017401482A1 (en) * 2017-03-01 2019-09-19 Equinor Energy As Characterisation of emulsion stability
EP4185463A1 (fr) 2020-07-24 2023-05-31 Basell Poliolefine Italia S.r.l. Composition de polyoléfine pour applications de toiture
CN115803186A (zh) 2020-08-07 2023-03-14 巴塞尔聚烯烃意大利有限公司 柔软柔性的聚烯烃组合物
EP4259719A1 (fr) 2020-12-14 2023-10-18 Basell Poliolefine Italia S.r.l. Composition polyoléfinique ultrasouple
EP4288285A1 (fr) 2021-02-08 2023-12-13 Basell Poliolefine Italia S.r.l. Composition de polyoléfine pour films fonctionnels
CN116761721A (zh) 2021-02-26 2023-09-15 巴塞尔聚烯烃股份有限公司 用于挤出增材制造的印刷平台
KR20240017933A (ko) 2021-06-10 2024-02-08 바셀 폴리올레핀 이탈리아 에스.알.엘 폴리프로필렌 조성물 및 이로부터 제조되는 광원 피복재
WO2022263212A1 (fr) 2021-06-16 2022-12-22 Basell Poliolefine Italia S.R.L. Composition de polyoléfine chargée
CN117480214A (zh) 2021-07-12 2024-01-30 巴塞尔聚烯烃意大利有限公司 填充聚烯烃组合物
WO2023072570A1 (fr) 2021-10-28 2023-05-04 Basell Polyolefine Gmbh Composition de polypropylène renforcé
WO2023117512A1 (fr) 2021-12-23 2023-06-29 Basell Poliolefine Italia S.R.L. Composition de polyoléfine souple
WO2023213536A1 (fr) 2022-05-06 2023-11-09 Basell Poliolefine Italia S.R.L. Matériau plastique et article façonné obtenu à partir de celui-ci
WO2023247227A1 (fr) 2022-06-20 2023-12-28 Basell Poliolefine Italia S.R.L. Film multicouche
WO2024028042A1 (fr) 2022-08-03 2024-02-08 Basell Poliolefine Italia S.R.L. Composition de polypropylène pour films thermoscellables

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ATE26888T1 (de) * 1981-11-09 1987-05-15 Wiggins Teape Group Ltd Apparat zur bestimmung eines elektrischen merkmals einer faser-dispersion.
GB9011333D0 (en) * 1990-05-21 1990-07-11 Paper Chemistry Lab Inc A method and apparatus for measuring an electrical characteristic of a fibrous dispersion
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US5119029A (en) * 1991-03-04 1992-06-02 Bryant Robert L Easily cleaned streaming current monitor
US5365775A (en) * 1993-09-27 1994-11-22 Penniman John G Process for automatic measurement of specific filtration resistance and electrostatic charge of a fibrous dispersion
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US5911810A (en) * 1997-06-23 1999-06-15 Sanden Corp. Coffee brewing apparatus and method of brewing coffee by the apparatus
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Also Published As

Publication number Publication date
WO2007057160A3 (fr) 2007-07-12
US20080315863A1 (en) 2008-12-25
WO2007057160A2 (fr) 2007-05-24

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