In-situ UV−visible and Raman spectroscopy for gas−liquid−solid systems / C. P. Stemmet in Industrial & engineering chemistry research, Vol. 48 N° 17 (Septembre 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 8205–8210 Titre : In-situ UV−visible and Raman spectroscopy for gas−liquid−solid systems Type de document : texte imprimé Auteurs : C. P. Stemmet, Auteur ; Jaap C. Schouten, Auteur ; T.A. Nijhuis, Auteur Année de publication : 2009 Article en page(s) : pp. 8205–8210 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : UV−  vis and Raman spectroscopy Multiphase reactor Bubble column Résumé : This paper presents the use of UV−vis and Raman spectroscopy to measure the state of a solid in a multiphase reactor. A slurry of particles and a packed bubble column were used. As this study is a proof of principle a model for an active catalyst system, insoluble pH indicators deposited on the particles and on a solid foam packing (used as the packing material in the packed bubble column) are used. This insoluble pH indicator has different UV−vis and Raman spectra according to the liquid pH. The experimental results indicate that for the slurry the spectra obtained from the moving particles can be used to characterize the state of the pH indicator. Bubbles in the packed bubble column result in disturbances in the UV−vis and Raman spectra collected from the pH indicator adsorbed to the solid surface and this interference is removed successfully with a newly developed tolerance-and-averaging method. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801984w [article] In-situ UV−visible and Raman spectroscopy for gas−liquid−solid systems [texte imprimé] / C. P. Stemmet, Auteur ; Jaap C. Schouten, Auteur ; T.A. Nijhuis, Auteur . - 2009 . - pp. 8205–8210. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 8205–8210 Mots-clés : UV−  vis and Raman spectroscopy Multiphase reactor Bubble column Résumé : This paper presents the use of UV−vis and Raman spectroscopy to measure the state of a solid in a multiphase reactor. A slurry of particles and a packed bubble column were used. As this study is a proof of principle a model for an active catalyst system, insoluble pH indicators deposited on the particles and on a solid foam packing (used as the packing material in the packed bubble column) are used. This insoluble pH indicator has different UV−vis and Raman spectra according to the liquid pH. The experimental results indicate that for the slurry the spectra obtained from the moving particles can be used to characterize the state of the pH indicator. Bubbles in the packed bubble column result in disturbances in the UV−vis and Raman spectra collected from the pH indicator adsorbed to the solid surface and this interference is removed successfully with a newly developed tolerance-and-averaging method. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801984w

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Integration of microreactors with spectroscopic detection for online reaction monitoring and catalyst characterization / Jun Yue in Industrial & engineering chemistry research, Vol. 51 N° 45 (Novembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp 14583–14609 Titre : Integration of microreactors with spectroscopic detection for online reaction monitoring and catalyst characterization Type de document : texte imprimé Auteurs : Jun Yue, Auteur ; Jaap C. Schouten, Auteur ; T. Alexander Nijhuis, Auteur Année de publication : 2013 Article en page(s) : pp 14583–14609 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Microreactors Catalyst Résumé : Microreactor technology has gained significant popularity in the chemical and process industry in the past decade. The development of microreactors either as innovative production units for chemical synthesis or as promising laboratory tools for reaction and kinetic studies relies highly on the capability of performing online analyses, which opens great opportunities for the integration of spectroscopic detection techniques. This paper gives an overview of the state-of-the-art in the combination of microreactors with spectroscopic analyses for online reaction monitoring and catalyst characterization. In this upcoming field, many studies have been carried out combining fluorescence, ultraviolet–visible, infrared, Raman, X-ray, and nuclear magnetic resonance spectroscopy. Current research progress is reviewed, with emphasis on the existing integration schemes and selected application examples that demonstrate the potential of online spectroscopic detection for rapid microreactor process analysis and optimization. An outlook on the future development in this area is also presented. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301258j [article] Integration of microreactors with spectroscopic detection for online reaction monitoring and catalyst characterization [texte imprimé] / Jun Yue, Auteur ; Jaap C. Schouten, Auteur ; T. Alexander Nijhuis, Auteur . - 2013 . - pp 14583–14609. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp 14583–14609 Mots-clés : Microreactors Catalyst Résumé : Microreactor technology has gained significant popularity in the chemical and process industry in the past decade. The development of microreactors either as innovative production units for chemical synthesis or as promising laboratory tools for reaction and kinetic studies relies highly on the capability of performing online analyses, which opens great opportunities for the integration of spectroscopic detection techniques. This paper gives an overview of the state-of-the-art in the combination of microreactors with spectroscopic analyses for online reaction monitoring and catalyst characterization. In this upcoming field, many studies have been carried out combining fluorescence, ultraviolet–visible, infrared, Raman, X-ray, and nuclear magnetic resonance spectroscopy. Current research progress is reviewed, with emphasis on the existing integration schemes and selected application examples that demonstrate the potential of online spectroscopic detection for rapid microreactor process analysis and optimization. An outlook on the future development in this area is also presented. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301258j

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Mass transfer in a rotor−stator spinning disk reactor with cofeeding of gas and liquid / Meeuwse, Marco in Industrial & engineering chemistry research, Vol. 49 N° 4 (Fevrier 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1605–1610 Titre : Mass transfer in a rotor−stator spinning disk reactor with cofeeding of gas and liquid Type de document : texte imprimé Auteurs : Meeuwse, Marco, Auteur ; John Van Der Schaaf, Auteur ; Jaap C. Schouten, Auteur Année de publication : 2010 Article en page(s) : pp 1605–1610 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mass transfer Gas liquid. Résumé : This paper presents a new type of spinning disk reactor configuration for gas−liquid operations. It combines the features of a classical spinning disk with a liquid film on the rotor [e.g., Aoune, A.; Ramshaw, C. Int. J. Heat Mass Transfer 1999, 42, 2543−2556] and those of a rotor−stator spinning disk unit with a single gas inlet in the bottom stator [Meeuwse, M.; van der Schaaf, J.; Kuster, B. F. M.; Schouten, J. C. Chem. Eng. Sci. 2010, 65 (1), 466−471]. In this new configuration, gas and liquid are cofed through an inlet in the top stator. It is shown that gas−liquid mass transfer mainly takes place in the dispersed region between the rotor and the bottom stator. kGLaGLVR in this region is up to a factor of 6 larger than in the region with the liquid film on the rotor. Simulation of gas desorption from a saturated liquid shows that the gas−liquid mass transfer in this cofed configuration is considerably improved in comparison to the separate reactors, at similar operating conditions. The new reactor has also a higher potential for scaling up: gas and liquid can be cofed from one rotor−stator unit to another without the need for redistribution of the gas. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901301m [article] Mass transfer in a rotor−stator spinning disk reactor with cofeeding of gas and liquid [texte imprimé] / Meeuwse, Marco, Auteur ; John Van Der Schaaf, Auteur ; Jaap C. Schouten, Auteur . - 2010 . - pp 1605–1610. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1605–1610 Mots-clés : Mass transfer Gas liquid. Résumé : This paper presents a new type of spinning disk reactor configuration for gas−liquid operations. It combines the features of a classical spinning disk with a liquid film on the rotor [e.g., Aoune, A.; Ramshaw, C. Int. J. Heat Mass Transfer 1999, 42, 2543−2556] and those of a rotor−stator spinning disk unit with a single gas inlet in the bottom stator [Meeuwse, M.; van der Schaaf, J.; Kuster, B. F. M.; Schouten, J. C. Chem. Eng. Sci. 2010, 65 (1), 466−471]. In this new configuration, gas and liquid are cofed through an inlet in the top stator. It is shown that gas−liquid mass transfer mainly takes place in the dispersed region between the rotor and the bottom stator. kGLaGLVR in this region is up to a factor of 6 larger than in the region with the liquid film on the rotor. Simulation of gas desorption from a saturated liquid shows that the gas−liquid mass transfer in this cofed configuration is considerably improved in comparison to the separate reactors, at similar operating conditions. The new reactor has also a higher potential for scaling up: gas and liquid can be cofed from one rotor−stator unit to another without the need for redistribution of the gas. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901301m

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