DE19505133B4 - Burner for producing highly dispersed oxidic powders - Google Patents
Burner for producing highly dispersed oxidic powders Download PDFInfo
- Publication number
- DE19505133B4 DE19505133B4 DE19505133A DE19505133A DE19505133B4 DE 19505133 B4 DE19505133 B4 DE 19505133B4 DE 19505133 A DE19505133 A DE 19505133A DE 19505133 A DE19505133 A DE 19505133A DE 19505133 B4 DE19505133 B4 DE 19505133B4
- Authority
- DE
- Germany
- Prior art keywords
- oxygen
- burner
- combustion gas
- highly dispersed
- supply pressure
- 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.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/32—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid using a mixture of gaseous fuel and pure oxygen or oxygen-enriched air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
- F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Brenner
zur Herstellung hochdisperser oxidischer Pulver, der konzentrisch
angeordnete Rohre zur getrennten Zuführung der Medien enthält, dadurch
gekennzeichnet, dass
– jedes
Rohr in Bezug auf die Zuführströmungsrichtung
der Medien jeweils gegenüber
seinem unmittelbar umschließenden
Rohr zurückversetzt
angeordnet ist,
– durch
die Rohre von innen nach außen
Sauerstoff, ein gelöster
oder in flüssiger
Form vorliegender Oxidbildner, Sauerstoff und über das Außenrohr das Verbrennungsgas
zugeführt
sind und der Zuführungsdruck
des Sauerstoffs und des Oxidbildners wesentlich höher als
der Zuführungsdruck
des Verbrennungsgases ist.A burner for the production of highly dispersed oxidic powders containing concentrically arranged tubes for the separate supply of the media, characterized in that
Each tube is set back in relation to the feed flow direction of the media, in each case opposite its directly enclosing tube,
- By the tubes from the inside to the outside oxygen, a dissolved or in liquid form oxide generator, oxygen and the outer tube, the combustion gas are supplied and the supply pressure of the oxygen and the oxide generator is substantially higher than the supply pressure of the combustion gas.
Description
Die Erfindung betrifft einen Brenner zur Herstellung hochdisperser oxidischer Pulver, wie sie insbesondere zur Herstellung spezieller Keramikwerkstoffe, aber auch als Pigmente und als Materialien zur Herstellung von Beschichtungen durch Elektrophorese benötigt werden.The The invention relates to a burner for producing highly dispersed oxidic Powders, in particular for the production of special ceramic materials, but also as pigments and as materials for the production of coatings needed by electrophoresis become.
Es sind bereits Verfahren bekannt, um flüssige oder gasförmige Stoffe in der Flamme zu feinteiligen oxidischen Feststoffen, insbesondere zur Herstellung spezieller keramischer Werkstoffe, reagieren zu lassen.It Already known methods are liquid or gaseous substances in the flame to finely divided oxidic solids, in particular for the production of special ceramic materials, react too to let.
So kann man versprühte Lösungen der Oxidbildner mit Reaktionsgasen in einem von außen beheizten Reaktionsraum miteinander reagieren lassen (G.L. Messing, S.-C Zhang, G.V .Jayanthi, Ceramic Powder Synthesis by Spray Pyrolysis, J. Am. Ceram. Soc. 76 (11), (1993), S. 2707-2726). Nachteilig ist hierbei, dass oft stark agglomerisierte Partikel anfallen.So you can sprayed solutions the oxide former with reaction gases in an externally heated Reaction room (G.L. Messing, S.-C Zhang, G.V.Jayanthi, Ceramic Powder Synthesis by Spray Pyrolysis, J. Am. Ceram. Soc. 76 (11), (1993), pp. 2707-2726). The disadvantage here is that often strongly agglomerated particles occur.
Auch ist es bekannt, gasförmige Stoffe in eine Knallgasflamme einzuführen (H. Hartmann, A.T. Liu, D. Peukert, P. Kleinschmidt, Fumed Oxide as Base Materials for Ceramic Applications, Mat. Sci. Engin. A 109 (1989), S. 243-246). Da diese Stoffe meist Chloride sind, besteht die Gefahr von Chlorverunreinigungen. Es ist schwierig, auf diese Weise mehrkomponentige Verbindungen herzustellen.Also it is known gaseous Introducing substances into an oxyhydrogen flame (H. Hartmann, A.T. Liu, D. Peukert, P. Kleinschmidt, Fumed Oxide as Base Materials for Ceramic Applications, Mat. Sci. Engin. A 109 (1989), pp. 243-246). This one Substances are mostly chlorides, there is a risk of chlorine contamination. It is difficult in this way multi-component compounds manufacture.
Der Erfindung liegt die Aufgabe zugrunde, hochdisperse oxidische, auch ternäre und quarternäre Pulver mit möglichst kugelförmigen Teilchen im Durchmesserbereich von 10 bis 100 nm, in weitgehend monomodaler Größenverteilung, mit einer hohen Sinteraktivität und geringen Verunreinigungen, insbesondere frei von Verunreinigungen durch Chlor und dessen Verbindungen für die oben erwähnten Anwendungsgebiete herzustellen.Of the Invention is based on the object, highly dispersed oxidic, too ternary and quaternary Powder with as possible spherical Particles in the diameter range from 10 to 100 nm, in a large extent monomodal size distribution, with a high sintering activity and minor impurities, especially free from impurities by chlorine and its compounds for the abovementioned fields of application manufacture.
Diese Aufgabe wird durch die in den Ansprüchen beschriebene Erfindung gelöst.These The object is achieved by the invention described in the claims solved.
Durch die Erfindung lassen sich durch Einstellung der Zusammensetzung von Lösung oder Flüssigkeit definierte Stöchiometrieverhältnisse auch bei ternären oder quarternären Verbindungen sowie solchen mit Dotierungen erreichen. Die Herstellung sonst schwierig herstellbaren, thermodynamisch metastabilen Modifikationen ist möglich und es ergeben sich zusätzliche Steuermöglichkeiten über die Konzentration der Lösung, die Verbrennungsenthalpie des Lösungsmittels usw.By the invention can be achieved by adjusting the composition of solution or liquid defined stoichiometric ratios even with ternary ones or quaternary Connections as well as those with dopants reach. The production otherwise difficult to prepare, thermodynamically metastable modifications is possible and there are additional ones Control options over the Concentration of the solution, the combustion enthalpy of the solvent etc.
Die Erfindung wird nachstehend an einem Ausführungsbeispiel näher erläutert. Die beigefügten Zeichnungen stellen dar:The Invention will be explained in more detail using an exemplary embodiment. The attached drawings represent:
Eine 50 massen-%ige Lösung von Titanisopropylat Ti(OC3H7)4 in Toluol wird mit 4 Bar Sauerstoff zerstäubt und in der Knallsgasflamme oxidierend verbrannt. Das entstandene Produkt ist vorwiegend Anatas (mit 8% Rutil). Die ELMI-Aufnahmen belegen die sphärische Struktur und Korngrößenbereiche von 25 bis 35 nm. Die nach BET gemessene Oberfläche beträgt 55m2/g. Die Größen für Kristallinuntersuchungen (XRD) sind 25 nm und Lichtstreuuntersuchungen (DLS) 70 nm. Die Phasenumwandlung Anatas/Rutil findet bei 981 ° C statt (DSC). Beim Erhitzen zeigt das erhaltene Pulver einen geringen Massenverlust (1,9%), der auf die Oberflächenadsorption von CO2 und H2O zurückzuführen ist (Thermosorption).A 50% by mass solution of titanium isopropoxide Ti (OC 3 H 7 ) 4 in toluene is atomized with 4 bar oxygen and burned oxidizing in the blast gas flame. The resulting product is predominantly anatase (with 8% rutile). The ELMI images show the spherical structure and grain size ranges from 25 to 35 nm. The BET surface measured is 55 m 2 / g. The sizes for X-ray diffraction studies (XRD) are 25 nm and light scattering studies (DLS) 70 nm. The phase transformation anatase / rutile takes place at 981 ° C (DSC). When heated, the powder obtained shows a small mass loss (1.9%) due to the surface adsorption of CO 2 and H 2 O (thermosorption).
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19505133A DE19505133B4 (en) | 1995-02-16 | 1995-02-16 | Burner for producing highly dispersed oxidic powders |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19505133A DE19505133B4 (en) | 1995-02-16 | 1995-02-16 | Burner for producing highly dispersed oxidic powders |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19505133A1 DE19505133A1 (en) | 1996-08-22 |
DE19505133B4 true DE19505133B4 (en) | 2005-06-23 |
Family
ID=7754078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19505133A Expired - Fee Related DE19505133B4 (en) | 1995-02-16 | 1995-02-16 | Burner for producing highly dispersed oxidic powders |
Country Status (1)
Country | Link |
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DE (1) | DE19505133B4 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10163940A1 (en) * | 2001-12-22 | 2003-07-17 | Degussa | Flame hydrolytic silicon dioxide mixed powder, used e.g. in glass raw material, optical fiber, catalyst or chemical-mechanical polishing, contains tantalum and/or niobium oxide |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE830786C (en) * | 1948-12-31 | 1952-02-07 | Degussa | Process for the production of finely divided oxides |
EP0681989A1 (en) * | 1994-05-13 | 1995-11-15 | MERCK PATENT GmbH | Process for the preparation of multi-element metal oxide powders |
-
1995
- 1995-02-16 DE DE19505133A patent/DE19505133B4/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE830786C (en) * | 1948-12-31 | 1952-02-07 | Degussa | Process for the production of finely divided oxides |
EP0681989A1 (en) * | 1994-05-13 | 1995-11-15 | MERCK PATENT GmbH | Process for the preparation of multi-element metal oxide powders |
Non-Patent Citations (2)
Title |
---|
HARTMANN H., LIU A.T., DEUCKERT D., KLEINSCHMIDT P.: Fume Oxide as Base Materials for Ceramic Applications Mat.Sci.Engin. A 109(1989),S.243-246 * |
MESSING G.L., ZHANG S.-C., JAHANTHI G.V.: Ceramic Powder Synthesis by Spray Pyrolysis J.Am.Ceram. Soc. 76 (11), (1993), S. 2707-2726 * |
Also Published As
Publication number | Publication date |
---|---|
DE19505133A1 (en) | 1996-08-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8141 | Disposal/no request for examination | ||
8110 | Request for examination paragraph 44 | ||
8170 | Reinstatement of the former position | ||
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANG, DE |
|
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20140902 |