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Studies On The Phase Equilibrium For Toluene Oxidation System

Posted on:2016-11-28Degree:MasterType:Thesis
Country:ChinaCandidate:H WangFull Text:PDF
GTID:2311330473966419Subject:Chemical Engineering and Technology
Abstract/Summary:PDF Full Text Request
The oxidation of toluene is an important industrial synthetic reaction. The main products are benzyl alcohol, benzaldehyde and benzoic acid, which are widely used in the field of medicine, food and dye industry. Currently, the separation and purification process of the mixed products still remains difficulties. Based on the thermodynamics and physical properties for the oxidized products, we propose separating the mixed products of toluene oxidation by physical method. The physical method are desired to not only decreasing the energy consumption, but also decreasing the pollution of the environment. The phase equilibrium data of the oxidation system is inevitable. The present work focused on the phase equilibrium and divided these data into three categories: liquid-liquid phase equilbira(LLE),solid-liquid-liquid phase equilbira(SLLE), solid-liquid phase equilbira(SLE) and vapro-liquid phase equilbira(VLE). The four types of phase equilibria data were determined and verifed. The main contents are arranged as following:1. The liquid-liquid equilibrium data of the ternary system water + benzyl alcohol +methylbenzene, water + benzaldehyde + methylbenzene and water + benzyl alcohol +benzaldehyde were measured at( 303.2 to 343.2) K under atmospheric pressure. Using the NRTL and UNIQUAC activity coefficient models, the experimental data were correlated and the interaction parameters were determined by data-fitting. To verify the predictability of the determined binary parameters, the liquid-liquid equilibrium of water + benzyl alcohol +benzaldehyde + methylbenzene at 313.2K were predicted and compared with the experimental data. The results show that no apparent deviations between the predicted and the experimentally determined data.2. The solid-liquid equilibrium data of the ternary system benzoic acid + benzyl alcohol+ methylbenzene, benzoic acid + benzaldehyde + methylbenzene and benzoic acid + benzyl alcohol + benzaldehyde were measured under atmospheric pressure. Using the NRTL activity coefficient model, the experimental data were correlated and the interaction parameters were determined by data-fitting. To verify the predictability of the determined binary parameters,the solid-liquid equilibrium data of benzoic acid + benzyl alcohol + benzaldehyde +methylbenzene were predicted and compared with the experimental data. The results show that no apparent deviations between the predicted and the experimentally determined data.3. The solid-liquid-liquid equilibrium data of the system benzoic acid + methylbenzene+ water, benzoic acid + benzyl alcohol + water and benzoic acid + benzaldehyde + water at(303.2 to 333.2) K under atmospheric pressure. Using the NRTL activity coefficient model,the experimental data were correlated and the interaction parameters were determined bydata-fitting. To verify the predictability of the determined binary parameters, the solid-liquid-liquid equilibrium data of benzoic acid in different proportions of mixed solvent were predicted and compared with the experimental data. The results show that no apparent deviations between the predicted and the experimentally determined data.4. By literature surveying, the available vapor liquid equilibrium data for the oxidation system of toluene were retrieved, including the VLE of water + methylbenzene,methylbenzene + benzyl alcohol, methylbenzene + benzaldehyde and benzyl alcohol +benzaldehyde. Using the NRTL activity coefficient model, these literature data,accompanied with the above determined LLE, SLE and SLLE data were correlated simultaneously, and a unique set of binary interaction parameters were determined by data-fitting.
Keywords/Search Tags:Toluene oxidation, Liquid-liquid equilibrium, Solid-liquid equilibrium, Solid-liquid-liquid equilibrium, Vapor-liquid equilibrium
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