1. ZHAW digitalcollection
  2. Life Sciences und Facility Management
  3. Publikationen
  4. Publikationen Life Sciences und Facility Management
Full metadata record
DC FieldValueLanguage
dc.contributor.authorGholap, Raghuraj V.-
dc.contributor.authorPetrozzi, Sergio-
dc.contributor.authorBourne, John R.-
dc.date.accessioned2018-02-26T13:57:22Z-
dc.date.available2018-02-26T13:57:22Z-
dc.date.issued1994-
dc.identifier.issn0930-7516de_CH
dc.identifier.issn1521-4125de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/3174-
dc.description.abstractThe 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.de_CH
dc.language.isoende_CH
dc.publisherWileyde_CH
dc.relation.ispartofChemical Engineering & Technologyde_CH
dc.rightsLicence according to publishing contractde_CH
dc.subject.ddc660: Technische Chemiede_CH
dc.titleInfluence of viscosity on product distribution of fast competitive chemical reactionsde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementLife Sciences und Facility Managementde_CH
dc.identifier.doi10.1002/ceat.270170206de_CH
zhaw.funding.euNode_CH
zhaw.issue2de_CH
zhaw.originated.zhawNode_CH
zhaw.pages.end107de_CH
zhaw.pages.start102de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume17de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
Appears in collections:Publikationen Life Sciences und Facility Management

Files in This Item:
There are no files associated with this item.
Show simple item record
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.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.