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۱Modeling and simulation of arsenic (V) extraction from water by emulsion liquid membrane process using artificial neural networks
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۱۲
This study surveys the modeling and simulation of arsenic (v) extration through emulsion liquid membrane process from an aqueous medium using artificial neural networks (ANNs) andregression models. Water in oil emulsions were prepared by means of ultrasound and prepared emulsions then were used in a emulsion liquid membrane process for extraction of arsenic (v) ions from an aquesus medium. The effects of different concentration of Span 80 and mixture of Span80 and Tween 20 emulsifiers on the extraction of arsenic were investigated. ANN modeling wasdone using the multi–layer perceptron (MLP) network with Levenberg–Marquardt training algorithm. Furthermore, 3D regression was also used to model the process. Concentration ofarsenic in feed was obtained as function of emulsifier concentration and time. Results show good agreement between the simulation results and experimental data. To evaluate models performance, some statistical parameters were computed. Results show significantly better prediction of MLP networks than regression models and MLP networks can apply as a powerful tool for reliableprediction of the emulsion liquid membrane process.<\div>

۲Phase Equilibria Study of Quasi–Ternary Systems of Polyether sulfone (PES)\Cellulose Acetate Propianate (CAP)–NMP–Water
اطلاعات انتشار: پانزدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۴
Thermodynamic’s behaviour of a polymeric solution plays a key role in determination of final porous structure in membrane fabrication process.In this study, ternary phase diagrams of PESCAP mixed polymeric systems were detemined as well as their related pure systems in the presence of NMP as solvent and water as non–solvent. From the results, mixture of PES and CAP polymers with any studied mixing ratio became gel with total polymer conentration of more than 10 wt.%. Altough both pure polymer systems showed very well thermodynamic behaviour for application in membrane preparation, molecular polymeric interactions made the mixed polymeric systems unfavorable for membrane fabrications in he presence of NMP as solvent and water as non–solvent. Also, results showed that both polymer systems are suitable for preparation of microfiltration\ultrafiltration porous polymeric membranes<\div>

۳Prediction of Polymer\Solvent Interaction Parameter in Relation to Membrane Formation; Using a Theory Based on Hard–Sphere Limit
اطلاعات انتشار: پانزدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۴
Thermodynamic’s behaviour of a polymeric solution plays a key role in determination of final porous structure in membrane fabrication process. In this study, a hard–sphere limit model were used to predict the Flory–Huggins (FH) interaction parameter between polymer and solvent for four polymers commonly used for membrane fabrication including Polyethersulfone (PES), Cellulose acetate (CA), Polysulfone (PSU) and Polyetherimide (PEI) in the presence of three different solvents including DMF, NMP and Acetone. The predicted results were compared with experimental data. From the results, the model showed well agreement with experimental data; However, some differences were observed in higher polymer concentrations<\div>
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