| Publikationstyp: | Beitrag in wissenschaftlicher Zeitschrift |
| Art der Begutachtung: | Peer review (Publikation) |
| Titel: | Influence of viscosity on product distribution of fast competitive chemical reactions |
| Autor/-in: | Gholap, Raghuraj V. Petrozzi, Sergio Bourne, John R. |
| DOI: | 10.1002/ceat.270170206 |
| Erschienen in: | Chemical Engineering & Technology |
| Band(Heft): | 17 |
| Heft: | 2 |
| Seite(n): | 102 |
| Seiten bis: | 107 |
| Erscheinungsdatum: | 1994 |
| Verlag / Hrsg. Institution: | Wiley |
| ISSN: | 0930-7516 1521-4125 |
| Sprache: | Englisch |
| Fachgebiet (DDC): | 660: Technische Chemie |
| Zusammenfassung: | The objective of this study was to determine the influence of viscosity on micromixing in turbulent flow. It was first necessary to find a suitable viscosity-raising additive. HEC (hydroxyethyl cellulose) proved to be better than previously studied additives [sorbitol and carboxymethylcellulose (CMC)]. In concentrations up to 1 wt-%, HEC solutions are almost Newtonian with viscosities independent of pH over the range 2 to 10. HEC had no effect on the reaction rate constants and the spectrophotometric analysis of the fast, competing reactions used – the diazo coupling between 1-naphthol and diazotized sulphanilic acid. The viscosity can then be raised by around an order of magnitude by adding less than 1 wt-% HEC to this reaction system. Diazo couplings were conducted in a 20 1 semi-batch tank reactor stirred by a Rushton turbine at two viscosity levels (0.9 and 6.2 mPa s). Long feed times ensured that micromixing was controlling. More bisazo dye was formed in the more viscous solution, all other conditions being unchanged, indicating more intense segregation and slower micromixing. This was also shown by visualizing the extent of neutralisation zones, with more spreading and slower micromixing being observed in viscous solution. Higher turbine speeds reduced this spreading. One feed point near and one far from the turbine were employed: the strong inhomogeneity of the turbulence led to smaller amounts of bisazo dye when the feed was added to the turbine suction, irrespective of the viscosity. All results agreed with the trends predicted by the engulfment model of micromixing. Its simplest form assigns an average energy dissipation rate to the reaction zone: the values obtained are of similar magnitude to those measured by physical techniques and were related to the spreading of the reaction zone. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/3174 |
| Volltext Version: | Publizierte Version |
| Lizenz (gemäss Verlagsvertrag): | Lizenz gemäss Verlagsvertrag |
| Departement: | Life Sciences und Facility Management |
| Enthalten in den Sammlungen: | Publikationen Life Sciences und Facility Management |
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Gholap, R. V., Petrozzi, S., & Bourne, J. R. (1994). Influence of viscosity on product distribution of fast competitive chemical reactions. Chemical Engineering & Technology, 17(2), 102–107. https://doi.org/10.1002/ceat.270170206
Gholap, R.V., Petrozzi, S. and Bourne, J.R. (1994) ‘Influence of viscosity on product distribution of fast competitive chemical reactions’, Chemical Engineering & Technology, 17(2), pp. 102–107. Available at: https://doi.org/10.1002/ceat.270170206.
R. V. Gholap, S. Petrozzi, and J. R. Bourne, “Influence of viscosity on product distribution of fast competitive chemical reactions,” Chemical Engineering & Technology, vol. 17, no. 2, pp. 102–107, 1994, doi: 10.1002/ceat.270170206.
GHOLAP, Raghuraj V., Sergio PETROZZI und John R. BOURNE, 1994. Influence of viscosity on product distribution of fast competitive chemical reactions. Chemical Engineering & Technology. 1994. Bd. 17, Nr. 2, S. 102–107. DOI 10.1002/ceat.270170206
Gholap, Raghuraj V., Sergio Petrozzi, and John R. Bourne. 1994. “Influence of Viscosity on Product Distribution of Fast Competitive Chemical Reactions.” Chemical Engineering & Technology 17 (2): 102–7. https://doi.org/10.1002/ceat.270170206.
Gholap, Raghuraj V., et al. “Influence of Viscosity on Product Distribution of Fast Competitive Chemical Reactions.” Chemical Engineering & Technology, vol. 17, no. 2, 1994, pp. 102–7, https://doi.org/10.1002/ceat.270170206.
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