WO1999008104A1 - On-line-analyse der prozessgase bei der herstellung von keten - Google Patents
On-line-analyse der prozessgase bei der herstellung von keten Download PDFInfo
- Publication number
- WO1999008104A1 WO1999008104A1 PCT/EP1998/004655 EP9804655W WO9908104A1 WO 1999008104 A1 WO1999008104 A1 WO 1999008104A1 EP 9804655 W EP9804655 W EP 9804655W WO 9908104 A1 WO9908104 A1 WO 9908104A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- probe
- ketene
- gas mixture
- analysis
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
-
- 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
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
- G01N2001/2261—Sampling from a flowing stream of gas in a stack or chimney preventing condensation (heating lines)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
- G01N2001/242—Injectors or ejectors
- G01N2001/244—Injectors or ejectors using critical flow orifices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T436/00—Chemistry: analytical and immunological testing
- Y10T436/24—Nuclear magnetic resonance, electron spin resonance or other spin effects or mass spectrometry
Definitions
- the invention relates to a method for on-line analysis of a reactive gas mixture, in particular one containing ketene and / or diketene and / or acetic anhydride and / or acetic acid, which is in a container at a first pressure.
- the catalyzed pyrolysis of acetic acid is used to produce
- Acetic anhydride, diketene and ketene carried out on an industrial scale.
- Keten becomes a direct product, e.g. Sorbic acid and dimethylacrylic acid lactone processed.
- the reaction takes place at higher temperatures in the range from 400 to 800 ° C and under negative pressure.
- water and ketene a number of
- Carbon dioxide, ethene, ethyne, methane, propadiene and hydrogen are formed. After the reaction, unreacted acetic acid and
- the invention was therefore based on the object of providing a method which allows online analysis of the gas mixture mentioned at the outset. It has now surprisingly been found that the reactive gas mixture described can be analyzed online and continuously if a sample gas stream is sucked out of the mixture with a probe with a small opening diameter and fed to a mass spectrometer for analysis via an evacuated sampling line. A momentary relaxation to a low pressure takes place via the probe opening, which in the sampling line leads to Mass spectrometer is maintained by means of vacuum pumps. A further reduction in pressure takes place when the gas mixture enters the mass spectrometer.
- the invention therefore relates to a method for on-line analysis of a reactive gas mixture, in particular one containing ketene and / or diketene and / or acetic anhydride and / or acetic acid, which is in a container at a first pressure, characterized in that Part of the gas mixture is expanded via a probe to a second pressure, which is at least 10 times lower than the first pressure, into a sampling line and fed to a mass spectrometer for analysis.
- the invention also relates to a method for on-line analysis of a reactive gas mixture, in particular one containing ketene and / or diketene and / or acetic anhydride and / or acetic acid, which is in a container, characterized in that part of the gas mixture Via a probe that is integrated into the container and that has an opening whose free cross-section is less than or equal to 1 mm ⁇ , it is currently relaxed into a sampling line and fed to a mass spectrometric analysis.
- a reactive gas mixture in particular one containing ketene and / or diketene and / or acetic anhydride and / or acetic acid
- the probe can be integrated or flanged into the container and is preferably made of metal, quartz or ceramic material, and the opening preferably has a free cross section of between 8 * 10 "4 and 0.8 mr ⁇ .2 (eg circular hole with a diameter from 0.01 to 1 mm).
- the probe is connected to the mass spectrometer via the sampling line.
- the vacuum can be generated by a pump that delivers a high final vacuum (eg rotary vane pump).
- a partial flow of the extracted process gas is analyzed with the mass spectrometer The calibration of the
- mass spectrometers are carried out with certified gas mixtures, via liquids evaporated in the carrier gas and with ketene gas mixtures obtained in the laboratory by thermal decomposition of diketene.
- the representative sampling of the reactive gas flow is in the special case of sampling for ketene analysis by a momentary relaxation of the pressure from process conditions (100-1000 mbar) to sampling pressure (1-20 mbar) through the small opening at the tip of the probe.
- a pressure reduction by a factor of 100 slows the reactions by a factor of 10000 (in the case of second-order reactions).
- due to the low heat capacity of the expanded process gas it is rapidly cooled to room temperature, which further slows down possible reactions in the
- Sampling line leads.
- the relaxation time depends on the opening geometry of the probe tip.
- the relaxation takes place instantaneously, preferably within a time period of less than or equal to 0.1 s, particularly preferably within 1 ms to 1 ⁇ s.
- An adaptation to higher process pressures, for example above 30 bar, is readily possible.
- a heating of the sampling line to avoid the condensation of components from the process gas is not necessary in the special case due to the low pressure in the sampling line.
- the device used for sampling essentially consisting of a probe, sampling line and mass spectrometer, can be equipped with pressure sensors, filters, valves and control valves for monitoring and controlling the sampling.
- a two-stage pressure reduction within the mass spectrometer facilitates the control, the installation and in particular the simultaneous operation of several measuring points.
- FIGS. 1, 2 and 3 An exemplary embodiment of the invention is described in more detail below with reference to FIGS. 1, 2 and 3. It is not intended to limit it in any way.
- 1 shows a simplified process flow diagram
- 2 shows a reactor with a probe for sampling
- 3 shows a sketch of the probe tip.
- acetic acid 1 is heated in a preheater 2, then a catalyst 3 is added, mixed intensively with the catalyst 3 in a heated mixer 4 and reacted in a heated reactor 5.
- the resulting reaction mixture 6 is withdrawn from the reactor 5.
- samples are taken from the process gas streams by means of pumps 7 and via probes 18 (only shown for the reactor 5) and fed to a mass spectrometer 8 for analysis.
- the system of lines 9 for sampling is with pressure sensors 10, filters 11, valves 12 and control valves 13 for monitoring and controlling the sampling fitted.
- the pumps 7 are flushed with nitrogen 16 for explosion protection, and the nitrogen flow is monitored with flow meters 15.
- the pressure behind the flow meter 15 is monitored with a pressure sensor 10. Process materials 1, 3 are guided in line system 17.
- Fig. 2 shows a reactor 5 which is designed as a tubular reactor and in which a probe 18 for sampling is installed.
- the probe 18 consists essentially of a tube with a truncated cone-shaped probe tip 19 which has a small opening 20.
- FIG. 3 shows an embodiment of the probe tip according to the invention in the form of a truncated cone with an angle ⁇ of preferably 60 °, a bore with a diameter d1 of preferably 0.3 mm and a length I of preferably 0.5 mm.
- the outer diameter d2 on the end face of the truncated cone is preferably 1 mm.
- the diameter d3 on the base of the truncated cone is adapted to the geometry of the sampling line.
- Test measurements in such plants for acetic acid pyrolysis were successfully carried out on the operating and pilot plant scale after the stages of preheating, catalyst metering, reactor, condensation, washing with acetic anhydride and after compression of the process gases.
- the diameter of the probe opening was 100, 200, 300 or 500 ⁇ m, corresponding to a pressure of the process gas between 100 and 1100 mbar.
- the pressure behind the tip of the probe after expansion was between 2 and 20 mbar and the pressure at the inlet system of the mass spectrometer was 1 to 5 mbar.
- the mass spectrometer was operated continuously. The time between two analyzes was about 1 min.
- the diameter of the probe opening was 100, 200, 300 or 500 ⁇ m, corresponding to a pressure of the process gas between 100 and 1100 mbar.
- the pressure behind the tip of the probe after expansion was between 2 and 20 mbar and the pressure at the inlet system of the mass spectrometer was 1 to 5 mbar.
- the mass spectrometer was
- sample gas volume ( ⁇ 10 l ⁇ / h) and the low maintenance.
- the quantitative determination of the process gas composition is necessary to improve process control and regulation and opens up considerable savings potential through a better understanding of the process.
- the device can also be used in general in other processes for representative sampling of reactive and / or corrosive process gases.
- Ketene and / or acetic acid is reacted, e.g. Acetic acid pyrolysis, production of ketene secondary products and acetic acid (sorbic acid and dimethylacrylic acid lactone), monitoring of the educt streams, sampling and analysis of reactive and / or corrosive gas mixtures in any process.
- a corresponding device for sampling can be adapted to changed pressure and temperature conditions with little effort.
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Sampling And Sample Adjustment (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/463,676 US6284547B1 (en) | 1997-08-06 | 1998-07-24 | On-line analysis of process gas during the production of ketene |
CA002299248A CA2299248A1 (en) | 1997-08-06 | 1998-07-24 | On-line analysis of process gas during the production of ketene |
JP2000506522A JP2001512828A (ja) | 1997-08-06 | 1998-07-24 | ケテン製造時のプロセスガスのオンライン分析 |
EP98939639A EP1002231A1 (de) | 1997-08-06 | 1998-07-24 | On-line-analyse der prozessgase bei der herstellung von keten |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19733837A DE19733837C2 (de) | 1997-08-06 | 1997-08-06 | Verfahren zur quantitativen On-Line-Analyse einer reaktiven Gasmischung |
DE19733837.2 | 1997-08-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999008104A1 true WO1999008104A1 (de) | 1999-02-18 |
Family
ID=7838048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/004655 WO1999008104A1 (de) | 1997-08-06 | 1998-07-24 | On-line-analyse der prozessgase bei der herstellung von keten |
Country Status (7)
Country | Link |
---|---|
US (1) | US6284547B1 (de) |
EP (1) | EP1002231A1 (de) |
JP (1) | JP2001512828A (de) |
CN (1) | CN1266488A (de) |
CA (1) | CA2299248A1 (de) |
DE (1) | DE19733837C2 (de) |
WO (1) | WO1999008104A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103033575A (zh) * | 2012-12-17 | 2013-04-10 | 苏州浩波科技股份有限公司 | 乙烯酮二聚成双乙烯酮的中控检测方法 |
CN109655545A (zh) * | 2018-12-28 | 2019-04-19 | 山东玉皇化工有限公司 | 一种用于异丁烯制备叔丁胺的色谱分析装置及方法 |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2938916B1 (fr) * | 2008-11-24 | 2012-10-19 | Ap2E | Dispositif d'echantillonnage de gaz. |
CN101915697A (zh) * | 2010-07-28 | 2010-12-15 | 泰州市天创仪器有限公司 | 微量测定用石英裂解转化管 |
DE102012008423A1 (de) * | 2012-04-30 | 2013-10-31 | E.On New Build & Technology Gmbh | Einrichtung und Verfahren zur aggregierten Probenahme von Gas |
US10222302B1 (en) * | 2014-11-06 | 2019-03-05 | Mayeaux Holding Llc | Cyclonic system for enhanced separation in fluid sample probes and the like |
US9909956B1 (en) | 2014-12-03 | 2018-03-06 | Mayeaux Holding Llc | Cyclonic system for enhanced separation of fluid samples and the like, and method therefore |
CN106525518B (zh) * | 2016-12-29 | 2020-07-07 | 中国环境科学研究院 | 一种能够自动改变采样系统压力的机载采样系统及其应用 |
CN106596201B (zh) * | 2016-12-29 | 2020-07-07 | 中国环境科学研究院 | 一种能够防止水蒸气凝结的机载采样头及其应用 |
CN106769251B (zh) * | 2016-12-29 | 2020-07-31 | 中国环境科学研究院 | 一种自动化采样系统及其应用 |
EP3418714A1 (de) * | 2017-06-19 | 2018-12-26 | V&F Analyse- und Messtechnik GmbH | Vorrichtung und verfahren zur partiellen überführung einer mehrere komponenten umfassende flüssigkeitsprobe, und verfahren zur online bestimmung und analyse dieser komponenten |
CN110187017A (zh) * | 2019-05-09 | 2019-08-30 | 中触媒新材料股份有限公司 | 一种环氧丙烷在线取样装置和方法 |
CN114105748A (zh) * | 2020-08-28 | 2022-03-01 | 万华化学集团股份有限公司 | 一种制备方法、制备得到的烯酮类化合物以及该化合物的应用 |
Citations (3)
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EP0243569A1 (de) * | 1986-04-29 | 1987-11-04 | VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. | Verfahren und Vorrichtung zur kontinuierlichen Entnahme einer heissen Gasprobe aus einem Reaktionsraum für eine Gasanalyse |
US4800763A (en) * | 1987-02-03 | 1989-01-31 | Veg-Gasinstituut N.V. | Method of sampling a fluid stream and apparatus suitable therefor |
EP0387137A2 (de) * | 1989-03-08 | 1990-09-12 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Druckreduziervorrichtung zur Teilchenentnahme aus komprimierten Gasen |
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US3748906A (en) * | 1970-10-15 | 1973-07-31 | Jones & Laughlin Steel Corp | Gas sampling apparatus |
US4272481A (en) * | 1979-05-21 | 1981-06-09 | The Dow Chemical Company | System and method for providing a vapor phase sample for analysis |
DD277378A3 (de) * | 1987-07-01 | 1990-04-04 | Freiberg Brennstoffinst | Verfahren und Vorrichtung zur Entspannung von Dampf-Gas-Gemischen für Analysenzwecke |
IL90970A (en) * | 1989-07-13 | 1993-07-08 | Univ Ramot | Mass spectrometer method and apparatus for analyzing materials |
DD294789A5 (de) * | 1990-05-23 | 1991-10-10 | Brennstoffinstitut Freiberg,De | Vorrichtung zur entspannung von gas fuer analysenzwecke |
JPH06310091A (ja) * | 1993-04-26 | 1994-11-04 | Hitachi Ltd | 大気圧イオン化質量分析計 |
US5417105A (en) * | 1994-02-18 | 1995-05-23 | Hughes Aircraft Company | Flow accelerator for leak detector probe |
US5736654A (en) * | 1995-11-22 | 1998-04-07 | The Dow Chemical Company | Self-contained on-line sampling apparatus |
US6100975A (en) * | 1996-05-13 | 2000-08-08 | Process Instruments, Inc. | Raman spectroscopy apparatus and method using external cavity laser for continuous chemical analysis of sample streams |
US5751415A (en) * | 1996-05-13 | 1998-05-12 | Process Instruments, Inc. | Raman spectroscopy apparatus and method for continuous chemical analysis of fluid streams |
-
1997
- 1997-08-06 DE DE19733837A patent/DE19733837C2/de not_active Expired - Fee Related
-
1998
- 1998-07-24 JP JP2000506522A patent/JP2001512828A/ja active Pending
- 1998-07-24 US US09/463,676 patent/US6284547B1/en not_active Expired - Fee Related
- 1998-07-24 EP EP98939639A patent/EP1002231A1/de not_active Withdrawn
- 1998-07-24 CA CA002299248A patent/CA2299248A1/en not_active Abandoned
- 1998-07-24 WO PCT/EP1998/004655 patent/WO1999008104A1/de not_active Application Discontinuation
- 1998-07-24 CN CN98808005.2A patent/CN1266488A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0243569A1 (de) * | 1986-04-29 | 1987-11-04 | VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. | Verfahren und Vorrichtung zur kontinuierlichen Entnahme einer heissen Gasprobe aus einem Reaktionsraum für eine Gasanalyse |
US4800763A (en) * | 1987-02-03 | 1989-01-31 | Veg-Gasinstituut N.V. | Method of sampling a fluid stream and apparatus suitable therefor |
EP0387137A2 (de) * | 1989-03-08 | 1990-09-12 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Druckreduziervorrichtung zur Teilchenentnahme aus komprimierten Gasen |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103033575A (zh) * | 2012-12-17 | 2013-04-10 | 苏州浩波科技股份有限公司 | 乙烯酮二聚成双乙烯酮的中控检测方法 |
CN109655545A (zh) * | 2018-12-28 | 2019-04-19 | 山东玉皇化工有限公司 | 一种用于异丁烯制备叔丁胺的色谱分析装置及方法 |
Also Published As
Publication number | Publication date |
---|---|
DE19733837C2 (de) | 2000-07-27 |
DE19733837A1 (de) | 1999-02-25 |
CN1266488A (zh) | 2000-09-13 |
US6284547B1 (en) | 2001-09-04 |
JP2001512828A (ja) | 2001-08-28 |
CA2299248A1 (en) | 1999-02-18 |
EP1002231A1 (de) | 2000-05-24 |
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