A computer model of water-in-oil emulsion coagulation

 

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dc.contributor.advisor Jackson, Graham Ellis en_ZA
dc.contributor.author Seymour, Lisa en_ZA
dc.date.accessioned 2016-03-17T12:46:04Z
dc.date.available 2016-03-17T12:46:04Z
dc.date.issued 1996 en_ZA
dc.identifier.citation Seymour, L. 1996. A computer model of water-in-oil emulsion coagulation. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/17966
dc.description Include bibliographical references. en_ZA
dc.description.abstract In this thesis, a stochastic computer model of water-in-oil emulsion coagulation, a two stage process of aggregation and coalescence, is presented. The theoretical basis of the model, including equations for the van der Waals, electrostatic and steric energy barriers between dissimilar droplets, is described. Many of these equations have been derived by the author. A chemical speciation study of the aqueous phase typically found in emulsion explosives is presented. A potentiometric investigation of the protonation equilibria of propionate, succinate and mono-methyl succinate in tetraethyl ammonium bromide, ammonium nitrate, sodium nitrate, potassium nitrate and calcium nitrate at 25°C and 3 mol/dm³ ionic strength was performed. Nuclear Magnetic Resonance titrations for succinate and propionate in varying concentrations of the same salts are also shown. A method of converting thermodynamic stability constants from one ionic strength to another using a modified form of the Pitzer equations is presented with a computer program which performs the conversion. A novel method of obtaining complexation constants from protonation constants in varying media is proposed. Using optical microscopy, creaming rates and laser particle sizing, the affects of changing surfactant concentration, salt concentration, pH and shearing time for emulsions of ammonium nitrate solution in heptane with CRILL 43 are shown. Equations are derived for converting creaming rate data to droplet size information and a computer program for converting Malvern light intensity data in the anomalous regime (typical of water-in-oil emulsions) to size distribution data is presented. The computer model is validated against experimental data from this work and the literature and is used to make stability predictions for systems for which no data exists. Further uses for the model are discussed. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Chemistry en_ZA
dc.title A computer model of water-in-oil emulsion coagulation en_ZA
dc.type Doctoral Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Chemistry en_ZA
dc.type.qualificationlevel Doctoral
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Seymour, L. (1996). <i>A computer model of water-in-oil emulsion coagulation</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Chemistry. Retrieved from http://hdl.handle.net/11427/17966 en_ZA
dc.identifier.chicagocitation Seymour, Lisa. <i>"A computer model of water-in-oil emulsion coagulation."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Chemistry, 1996. http://hdl.handle.net/11427/17966 en_ZA
dc.identifier.vancouvercitation Seymour L. A computer model of water-in-oil emulsion coagulation. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Chemistry, 1996 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17966 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Seymour, Lisa AB - In this thesis, a stochastic computer model of water-in-oil emulsion coagulation, a two stage process of aggregation and coalescence, is presented. The theoretical basis of the model, including equations for the van der Waals, electrostatic and steric energy barriers between dissimilar droplets, is described. Many of these equations have been derived by the author. A chemical speciation study of the aqueous phase typically found in emulsion explosives is presented. A potentiometric investigation of the protonation equilibria of propionate, succinate and mono-methyl succinate in tetraethyl ammonium bromide, ammonium nitrate, sodium nitrate, potassium nitrate and calcium nitrate at 25°C and 3 mol/dm³ ionic strength was performed. Nuclear Magnetic Resonance titrations for succinate and propionate in varying concentrations of the same salts are also shown. A method of converting thermodynamic stability constants from one ionic strength to another using a modified form of the Pitzer equations is presented with a computer program which performs the conversion. A novel method of obtaining complexation constants from protonation constants in varying media is proposed. Using optical microscopy, creaming rates and laser particle sizing, the affects of changing surfactant concentration, salt concentration, pH and shearing time for emulsions of ammonium nitrate solution in heptane with CRILL 43 are shown. Equations are derived for converting creaming rate data to droplet size information and a computer program for converting Malvern light intensity data in the anomalous regime (typical of water-in-oil emulsions) to size distribution data is presented. The computer model is validated against experimental data from this work and the literature and is used to make stability predictions for systems for which no data exists. Further uses for the model are discussed. DA - 1996 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1996 T1 - A computer model of water-in-oil emulsion coagulation TI - A computer model of water-in-oil emulsion coagulation UR - http://hdl.handle.net/11427/17966 ER - en_ZA


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