WO2008104689A2 - Dispositif de suivi du niveau du condensat recueilli dans le cylindre de mesure d'un appareil de distillation normalise ainsi que procede mis en oeuvre par l'utilisation de ce dispositif - Google Patents
Dispositif de suivi du niveau du condensat recueilli dans le cylindre de mesure d'un appareil de distillation normalise ainsi que procede mis en oeuvre par l'utilisation de ce dispositif Download PDFInfo
- Publication number
- WO2008104689A2 WO2008104689A2 PCT/FR2008/050198 FR2008050198W WO2008104689A2 WO 2008104689 A2 WO2008104689 A2 WO 2008104689A2 FR 2008050198 W FR2008050198 W FR 2008050198W WO 2008104689 A2 WO2008104689 A2 WO 2008104689A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- meniscus
- measuring cylinder
- condensate
- condensate collected
- volume
- Prior art date
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims description 16
- 230000005499 meniscus Effects 0.000 claims abstract description 57
- 238000004821 distillation Methods 0.000 claims abstract description 41
- 230000003287 optical effect Effects 0.000 claims abstract description 23
- 230000004888 barrier function Effects 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 238000012937 correction Methods 0.000 claims description 10
- 239000003209 petroleum derivative Substances 0.000 claims description 4
- 238000013519 translation Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/14—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
Definitions
- the present invention relates to a device for monitoring the level of the condensate collected in the measuring cylinder of a standard automatic distillation apparatus of liquid samples, in particular samples of petroleum products under atmospheric pressure.
- Such a distillation apparatus makes it possible to measure the distillation parameters of these samples by respecting a predefined test standard chosen from several possible test standards.
- distillation parameters of petroleum products are representative of the performance of these products as well as the risks that they may incur to their users.
- the specialists can deduce from these parameters what will be the behavior of a given petroleum product in a given situation and thus determine whether this product can or can not be used safely, in order to obtain the desired performances.
- distillations must be implemented by scrupulously respecting these standards.
- a heating chamber enclosing a heating element, in particular a heating resistor
- a series of distillation flasks respectively corresponding to at least one test standard and capable of being fixed to the frame of the apparatus in a predetermined position, the column of these flasks being able to be closed by a sealing plug provided with a thermometer for measuring the temperature of evaporated vapors and comprising a lateral branch intended to be connected to a condenser tube,
- a measuring cylinder making it possible to collect the condensate and equipped with measuring devices the quantity of condensate thus collected
- control and regulation means for controlling and varying over time an operating quantity of the heating element, in particular the temperature or the power of this element so as to obtain distillation parameters in accordance with a standard of predefined test.
- the measuring devices on the measuring cylinder are such as to allow a very fine determination of the level of the condensate collected in this cylinder. as well as a very precise follow-up of this level over time.
- the standard distillation apparatus of the above-mentioned type of measuring devices with the quantity of condensate collected in the measuring cylinder comprising an optical system consisting of a transmitter / receiver pair capable of passing an infrared beam, directed horizontally through the measuring cylinder, and cooperating with a linear drive by stepper motor movable in vertical translation so as to align the beam on the meniscus of the condensate collected in this cylinder so to detect the height of this meniscus.
- the infrared beam may or may not be centered on the median axis of the measuring cylinder.
- the linear drive by stepper motor can be very accurate to move the infrared beam in steps of 0.05 mm in the vertical plane.
- Such measuring devices based on the emission and reception of an infrared beam also have the advantage of not being affected by the ambient light.
- an eccentric light beam passing between the center and the wall of the measuring cylinder, makes it possible to make a clear distinction between the liquid sample to be analyzed and the air lying above this sample in the extent to which, when it is below the level of the latter, it is interrupted and can no longer reach the detector.
- Such an eccentric light beam does not, however, make it possible to determine whether one is below the lower part of the meniscus, that is to say the "true" meniscus, or between the lower part and the upper part of the this one.
- An eccentric light beam can detect only the upper part of the meniscus, so that in order to obtain the "true" meniscus, it is necessary to perform a correction which depends on the sample and is therefore imprecise.
- a median light beam has the disadvantage of not making it possible to obtain a level measurement that is sufficiently reliable, particularly at the beginning of distillation, where, in view of capillarity phenomena, the meniscus of the condensate is not perfectly formed, so that it is impossible to detect the lower part.
- a median beam is not interrupted by the liquid sample but its intensity is only decreased.
- Such a beam can thus make it possible to detect the upper part and the lower part of the meniscus, that is to say the "true" meniscus, but in the case of certain samples, the reduction of the intensity of the beam under the the effect of air or liquid may be of the same order, so that it is impossible to determine whether one is above or below the level of liquid; such samples can not be detected.
- the present invention aims to provide a device for monitoring the level of the condensate collected in the measuring cylinder of a standard distillation apparatus of the aforementioned type to overcome these disadvantages.
- This device comprises an optical system of the nature to emit at least one infrared beam directed horizontally through the measuring cylinder and cooperating with a linear drive by stepping motor movable in vertical translation so as to align the beam on the meniscus Condensate collected in this cylinder to detect the height of this meniscus.
- optical system comprises:
- a double optical barrier constituted by two pairs of transmitters / receivers each capable of passing a light beam directed horizontally through the measuring cylinder and cooperating with the linear drive by stepping motor so as to allow to align these beams on the meniscus condensate collected in this cylinder to allow to detect the height of the meniscus, one of these pairs transmitter / receiver emitting a first light beam or center beam centered on the measuring cylinder so to enable the lower part of the meniscus to be detected, while the other transmitter / receiver pair emits a second light beam or eccentric beam offset from the center beam, and passing between the center and the wall of the measuring cylinder so as to allow to detect the upper part of the meniscus, and
- a fixed optical barrier consisting of a transmitter / receiver pair for counting drops of condensate falling in the measuring cylinder during distillation.
- the device according to the invention makes it possible to follow constantly and very precisely the level of the condensate collected in the measuring cylinder of the distillation apparatus insofar as at the beginning of the distillation, this monitoring can be carried out by means of eccentric beam that can detect the upper part of the meniscus while as soon as possible, we can switch to perform this monitoring by means of the median beam that can detect the lower part of the meniscus.
- the device comprises a double optical barrier fixed to a frame 2 driven in vertical translation by a linear drive by stepper motor and a fixed optical barrier which is not shown.
- This double optical barrier consists of two transmitter / receiver pairs 3i, 32; 4i, 42 each capable of passing a light beam directed horizontally through the measuring cylinder 1.
- the light beam emitted by the transmitter 3i is a median beam centered on the measuring cylinder 1 and allows the receiver 32 to detect the part lower meniscus condensate collected in this cylinder 1.
- the light beam emitted by the transmitter 4i is an eccentric beam offset from the median beam and passing between the center and the wall of the measuring cylinder 1; it allows the detector 42 to detect the lower part of the meniscus condensate collected in the cylinder 1.
- X represents the distance expressed in steps of the linear drive by stepper motor between a low reference position corresponding to the bottom of the measuring cylinder and the height of the lower part of the meniscus.
- the method according to the invention thus makes it possible to have volume information similar to that which could be read by the user of a manual distillation apparatus on a graduated scale engraved on the measuring cylinder of this apparatus, but much more accurate and reliable.
- This method is characterized by the following succession of steps: in a preliminary calibration step, the parameters m and b of the equation (I) and the height MH of the meniscus are determined,
- the double optical barrier is positioned in the low reference position
- the step motor is actuated so as to move the double optical barrier upwards so that the eccentric beam detects and follows the upper part of the meniscus
- V mY + b - MH (II) in which Y represents the distance expressed in step of the linear drive by step motor between the low reference position and the height of the upper part of the meniscus,
- the detection is switched so as to follow the lower part of the meniscus with the aid of the median beam
- the height of the upper part of the magnet is determined from the position for which the eccentric beam is no longer interrupted by the sample or the meniscus during the upward movement of the linear drive. by stepper motor. Switching can be performed from the moment the median beam is interrupted for the first time by the meniscus.
- the process according to the invention also has the advantage of not being disturbed by fumes which may possibly appear in the measuring cylinder during distillation, insofar as the lower part of the meniscus is measured while the median beam is still located below the surface of the liquid sample.
- At least two known volumes V1 and V2 of sample are successively introduced into the measuring cylinder and the corresponding distances X1, X2, Y1 and Y2 are measured. .
- the height of the meniscus can also easily be calculated from the difference between the heights Ys and Xs or Y95 and X95 and has on average the following value:
- the values of the parameters m and b and the height MH of the meniscus thus determined during the preliminary calibration step can be stored and used constantly by the automatic distillation apparatus during distillation to allow this apparatus to provide the distillation parameters and in particular the amount of condensate collected as a function of time.
- the volume of drops of condensate falling in the measuring cylinder is calculated using the fixed optical barrier. and during the switching step, the necessary correction is made for the number of drops of condensate collected during this step and the volume thus calculated.
- the volume thus calculated can be used to effect the correction required during the switching step for the number of drops of condensate falling in the measuring cylinder during this step, as counted again by the fixed optical barrier.
- the method according to the invention thus makes it possible to obtain a precise and reliable constant monitoring of the level of condensate in the measuring cylinder, and thus to obtain distillation parameters that are perfectly representative of the sample to be analyzed. It should be noted that during distillation, the condensate may become too opaque to detect the lower part of the meniscus. In this case, it is possible, according to the invention, to perform another switching so as to follow again the upper part of the meniscus, again making the necessary correction to take into account drops of condensate fallen into the cylinder during this switching.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Analytical Chemistry (AREA)
- Fluid Mechanics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/525,966 US8448510B2 (en) | 2007-02-13 | 2008-02-08 | Device for monitoring the level of the condensate collected in the measuring cylinder of a standardized distillation apparatus and method implemented by using this device |
DE112008000261.4T DE112008000261B4 (de) | 2007-02-13 | 2008-02-08 | Verfahren zum Verfolgen des Pegels des in dem Messzylinder einer genormten Destillationsvorrichtung gesammelten Kondensats |
CN2008800039856A CN101627287B (zh) | 2007-02-13 | 2008-02-08 | 用来监控收集在标准化蒸馏装置的量筒中的冷凝液高度的装置以及使用该装置的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0753232A FR2912325B1 (fr) | 2007-02-13 | 2007-02-13 | Dispositif de suivi du niveau du condensat recueilli dans le cylindre de mesure d'un appareil de distillation normalise ainsi que procede mis en oeuvre par l'utilisation de ce dispositif. |
FR0753232 | 2007-02-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008104689A2 true WO2008104689A2 (fr) | 2008-09-04 |
WO2008104689A3 WO2008104689A3 (fr) | 2008-10-16 |
Family
ID=38515675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2008/050198 WO2008104689A2 (fr) | 2007-02-13 | 2008-02-08 | Dispositif de suivi du niveau du condensat recueilli dans le cylindre de mesure d'un appareil de distillation normalise ainsi que procede mis en oeuvre par l'utilisation de ce dispositif |
Country Status (5)
Country | Link |
---|---|
US (1) | US8448510B2 (fr) |
CN (1) | CN101627287B (fr) |
DE (1) | DE112008000261B4 (fr) |
FR (1) | FR2912325B1 (fr) |
WO (1) | WO2008104689A2 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9360414B2 (en) * | 2011-10-14 | 2016-06-07 | University of Pittsburgh—of the Commonwealth System of Higher Education | Light refraction imaging to measure liquid volume |
CN106644606A (zh) * | 2016-11-17 | 2017-05-10 | 西安培华学院 | 一种呼出气冷凝液收集装置 |
CN107091669B (zh) * | 2017-06-09 | 2023-07-04 | 泉州市全通光电科技有限公司 | 跟踪定位量筒液位精密变化的检测装置及其检测方法 |
US10758839B1 (en) * | 2018-01-22 | 2020-09-01 | Illuminated Extractors, Ltd. | Separation of distillation products using color sensing |
CN108414048B (zh) * | 2018-03-16 | 2024-01-30 | 中国石油大学(华东) | 标准金属量器液位计量装置及系统 |
US10983044B2 (en) | 2018-06-26 | 2021-04-20 | Arometrix, Inc. | Device, system and method for in-situ optical monitoring and control of extraction and purification of plant materials |
CN109556678A (zh) * | 2019-02-01 | 2019-04-02 | 北京世维通光智能科技有限公司 | 光纤液位监测装置 |
US20230100425A1 (en) | 2021-09-23 | 2023-03-30 | AD Systems S.A.S. | Atmospheric distillation apparatus and method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3364731A (en) * | 1964-12-14 | 1968-01-23 | Standard Oil Co | Condensate level responsive batch distillation |
DE3526644A1 (de) * | 1985-07-25 | 1987-01-29 | Bela Medvey | Rotationsverdampfer |
US5053111A (en) * | 1989-12-01 | 1991-10-01 | Ellerbe Jr William R | Method and apparatus for the batch distillation of water |
US6173609B1 (en) * | 1997-06-20 | 2001-01-16 | Optical Sensor Consultants, Inc. | Optical level sensor |
WO2003091667A2 (fr) * | 2002-04-24 | 2003-11-06 | Grabner Instruments Messtechnik Nfg. Gesellschaft M.B.H & Co Kg | Procede pour relever la courbe des points d'ebullition de liquides et dispositif permettant de mettre en oeuvre ce procede |
DE10354856A1 (de) * | 2003-11-19 | 2005-07-07 | Optotransmitter-Umweltschutz-Technologie E.V. | Verfahren und Anordnung zur Bestimmung von Veränderungen der Oberflächenspannung sowie zur Ermittlung des Niveaus transparenter Fluide |
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JP2002292890A (ja) * | 2001-03-30 | 2002-10-09 | Brother Ind Ltd | インクカートリッジ |
DE2937476A1 (de) | 1979-09-17 | 1981-04-02 | Agfa-Gevaert Ag, 5090 Leverkusen | Vorrichtung zur messung der oberflaechenspannung |
US4703314A (en) | 1986-02-27 | 1987-10-27 | Fisher Scientific Group, Inc. | Empty container detector with drop sensor |
GB2212262B (en) | 1987-11-09 | 1992-07-22 | Solinst Canada Ltd | Liquid level detector |
US4956560A (en) | 1989-02-03 | 1990-09-11 | The West Company | Liquid level detector system with fill-level signature detection |
DE10151681A1 (de) | 2001-10-19 | 2003-05-15 | Evotec Ag | Verfahren und Vorrichtung zur Bestimmung eines Tropfenvolumens |
DE102004053940B4 (de) | 2004-11-09 | 2011-03-10 | Schott Ag | Verfahren zum Auslitern von Behältern |
-
2007
- 2007-02-13 FR FR0753232A patent/FR2912325B1/fr active Active
-
2008
- 2008-02-08 CN CN2008800039856A patent/CN101627287B/zh active Active
- 2008-02-08 WO PCT/FR2008/050198 patent/WO2008104689A2/fr active Application Filing
- 2008-02-08 DE DE112008000261.4T patent/DE112008000261B4/de active Active
- 2008-02-08 US US12/525,966 patent/US8448510B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3364731A (en) * | 1964-12-14 | 1968-01-23 | Standard Oil Co | Condensate level responsive batch distillation |
DE3526644A1 (de) * | 1985-07-25 | 1987-01-29 | Bela Medvey | Rotationsverdampfer |
US5053111A (en) * | 1989-12-01 | 1991-10-01 | Ellerbe Jr William R | Method and apparatus for the batch distillation of water |
US6173609B1 (en) * | 1997-06-20 | 2001-01-16 | Optical Sensor Consultants, Inc. | Optical level sensor |
WO2003091667A2 (fr) * | 2002-04-24 | 2003-11-06 | Grabner Instruments Messtechnik Nfg. Gesellschaft M.B.H & Co Kg | Procede pour relever la courbe des points d'ebullition de liquides et dispositif permettant de mettre en oeuvre ce procede |
DE10354856A1 (de) * | 2003-11-19 | 2005-07-07 | Optotransmitter-Umweltschutz-Technologie E.V. | Verfahren und Anordnung zur Bestimmung von Veränderungen der Oberflächenspannung sowie zur Ermittlung des Niveaus transparenter Fluide |
Also Published As
Publication number | Publication date |
---|---|
CN101627287A (zh) | 2010-01-13 |
FR2912325B1 (fr) | 2009-04-24 |
FR2912325A1 (fr) | 2008-08-15 |
US8448510B2 (en) | 2013-05-28 |
DE112008000261T5 (de) | 2010-01-07 |
WO2008104689A3 (fr) | 2008-10-16 |
CN101627287B (zh) | 2011-04-06 |
DE112008000261B4 (de) | 2023-06-07 |
US20100031743A1 (en) | 2010-02-11 |
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