Experiment 3 CHM171L - CHM171L A11 Physical Chemistry...

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CHM171L / A11 Physical Chemistry Laboratory 2 1 st Quarter S.Y. 2010-2011 Chemical Kinetics: The Hydrolysis of Methyl Acetate Calderon, Edna 1 , Palomaria, Ralph Matthew 2 ,Pineda,Jermaine Marianne 2 , Regulacio, Anna Rafaela 2 1 Professor, CHM171L/A11, School of Chemical Engineering, Chemistry and Biotechnology, Mapua Institute of Technology; 2 Student, CHM171L /A11 , School of Chemical Engineering, Chemistry and Biotechnology, Mapua Institute of Technology ABSTRACT This experiment is on the subject of thermodynamics of mixtures, particularly on the determination of partial molar enthalpy. A partial molar property is a thermodynamic quantity which indicates how an extensive property of a solution or mixture varies with changes in the molar composition of the mixture at constant temperature and pressure , or for constant values of the natural variables of the extensive property considered. To determine the effect of concentration of the different components of the mixture on the molar enthalpy of the solution and to evaluate the partial molar enthalpy of the different components of the mixtures are the objectives of this experimentation. Here, Ammonium chloride served as the solute and distilled water was the solvent. It was observed that as the composition of the components of the mixture changes, the molar enthalpy of the solution varies in effect. INTRODUCTION The reaction kinetics and chemical equilibrium of the reversible catalytic hydrolysis reaction of a methyl acetate to acetic acid and methanol using a strongly acidic ion exchange resin catalyst named Amberlyst 15 were studied. To investigate the different behavior of Amberlyst 15 in the adsorption of reactants and product species, the equilibrium behavior of binary non-reactive liquid mixtures, consisting of one reactant and one product were studied experimentally. The Langmuir model was used to describe the equilibrium condition, quantitatively. Then the employed model was compared with the more complicated thermodynamic models to describe the equilibrium between the catalytic polymer resin and the liquid phase. The results indicated a good agreement. The effects of temperature, catalyst weight, and feed molar ratios on reaction kinetics were investigated. Results revealed that the reaction rate was strongly temperature dependent. The chemical equilibrium compositions were measured in a wide range of temperatures and feed molar ratios. Finally, pseudo homogeneous and LHHW (Langmuir Hinshelwood Hougen Watson) models were developed to calculate the rate of the reaction. Optimization of the model's parameters indicated that the use of activity instead of mole fraction, and also the use of LHHW rather than a pseudo homogeneous model resulted in much smaller residual errors. Also the equilibrium compositions obtained
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Experiment 3 CHM171L - CHM171L A11 Physical Chemistry...

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