Beitrag zur optimalen Gestaltung chemischer Reaktoren

One promising application of supercritical water as reaction medium is the selective oxidation from methane to methanol. Methanol is one of the most important intermediates in the chemical industry with a world‐wide production capacity of about 29 million tons per year (1996). A direct conversion of methane to methanol is not practicable in the gaseous phase, since the formed methanol is oxidized faster than methane. For this reason methanol is produced on the technical scale via synthesis gas route.

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“…Mixing in the reactor is based on the jet-loop principle [7,8]. Therefore, conventional stirrers do not need to be used.…”

Section: Continuous High Pressure Plantmentioning

confidence: 99%

Heterogeneously Catalyzed Partial Oxidation of Methane in Supercritical Water

Bröll

Krämer

Vogel³

2003

Chem Eng & Technol

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“…Bei der Maßstabsveränderung von Blasensäulen kommt vor allem der Gasverteilung eine besondere Bedeutung zu [5]. Aus den Untersuchungen an Schlaufenreaktoren mit Einphasensystemen ist bekannt, dass ein Scale-up über die geometrische Ähnlichkeit des Reaktors und die Energiedissipationsdichte [6] besonders vorteilhaft durchgeführt werden kann. Eine für Schlaufenreaktoren charakteristische Größe ist die Umwälzzahl n, die als Gesamtvolumenstrom zu Treibstrahlvolumenstrom definiert ist.…”

Section: Dimensionsanalyseunclassified

“…bestimmt werden [6]. Für die Flüssigphasendispersion und das Verweilzeitverhalten sind bei der Dimensionierung von Schlaufenreaktoren die Umwälzzahl und die turbulente Längsvermischung die entscheidenden Größen [7].…”

Section: Dimensionsanalyseunclassified

Scale‐down of the Jet Zone Loop Reactor: Development of a Screening Tool for Chemical Reactions

Wiedemann

Räbiger

Schlüter

et al. 2010

Chemie Ingenieur Technik

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Scale-down of the Jet Zone Loop Reactor: Development of a Screening Tool for Chemical ReactionsThe jet zone loop reactor (JZR) is a high performance loop reactor in which it was shown on different reactions that the use of multiscale transport phenomena leads to a significant increase in the space-time yield and selectivity. As the use of a JZR in a semi-industrial scale means a high effort, the development of a comparable screening tool in a laboratory scale is the logical step in which the new technology can be estimated easily and quickly. Experimental hydrodynamic studies of the laboratory reactor showed that significant integral and local parameters are similar to the reactor in semi-industrial scale, so that the reactor could be used to study a consecutive fast chlorination.Keywords: Halogenation, Jet loop reactor, Mass transfer, Scale-down ProblemstellungIn der chemischen Industrie wird aufgrund der stark steigenden Rohstoff-und Energiepreise sowie der zunehmenden Ressourcenverknappung zunehmend ein verstärkter Fokus auf die Intensivierung der innerhalb der Reaktoren wirksamen Prozesse gelegt. Ein Schritt zu dieser Prozessintensivierung ist der Einsatz eines Strahlzonen-Schlaufenreaktors (SZR) als ein Stoffaustauschapparat, der sich durch eine sehr hohe lokale Energiedissipationsrate im

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“…1, was developed for process conditions p max = 40 MPa, T max = 500 C, m = 1 to 20 kg h ±1 and s = 0.5 to 60 s. The main part of this plant is an electrically heated differential loop reactor (1) made of the high-nickel alloy Inconel 625 (volume: 16 cm 3 ). Mixing in the reactor is based on the jet loop principle [4]. Through a nozzle placed in the cap of the reactor, the reaction mixture streams downwards in the interior of an insertion tube, then turns round at the bottom and passes through the catalyst bed in the annular gap (maximum catalyst volume: 8 cm 3 ).…”

Section: Continuous High-pressure Plantmentioning

confidence: 99%

Heterogeneously Catalyzed Partial Oxidation in Supercritical Water

Bröll

Krämer

Vogel³

et al. 2001

Chem. Eng. Technol.

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A continuous high‐pressure plant for heterogeneously catalyzed partial oxidation in supercritical water is described. This plant features a differential loop reactor using the jet loop principle. In this apparatus, the partial oxidation of methanol to formaldehyde was first examined without catalysts in the parameter range 390 to 450 °C and 22 to 35 MPa. Then, metallic silver, copper and a gold/silver alloy were tested as catalysts under the same reaction conditions. The experiments showed that heterogeneously catalyzed partial oxidation in supercritical water is practicable with this plant.

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Beitrag zur optimalen Gestaltung chemischer Reaktoren

Cited by 38 publications

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Heterogeneously Catalyzed Partial Oxidation of Methane in Supercritical Water

Heterogeneously Catalyzed Partial Oxidation of Methane in Supercritical Water

Scale‐down of the Jet Zone Loop Reactor: Development of a Screening Tool for Chemical Reactions

Heterogeneously Catalyzed Partial Oxidation in Supercritical Water

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