A batch process is operated with the following sequence. The feed to the batch process consists of a solution of 500 L of ethanol with 120 mole of A and 120 mole of B.  If the temperature of the solution is sufficient, A and B will react to form P (the desired product): A (eth) + B (eth) → P (s)             DHreact = − 250 kJ/mol                                                           (1) Note that the product P is sparingly soluble in ethanol, which helps facilitate its removal from the reaction solution.  It can be assumed that the reaction rate is first-order in both the concentration of A (cA) and B (cB), and so second-order  The volume and initial amounts of the two reactants have been specified initially to be 500 L, 120 moles and 120 moles respectively; but there is no reason why these are optimal or indeed cannot be changed to increase the production rate.  The evidence would suggest that the production rate is enhanced by having the solvent reasonably saturated with A and B.  What does this say about initial amounts of A and B?

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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Chapter1: Introduction
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A batch process is operated with the following sequence. The feed to the batch process consists of a solution of 500 L of ethanol with 120 mole of A and 120 mole of B.  If the temperature of the solution is sufficient, A and B will react to form P (the desired product):

A (eth) + B (eth) → P (s)             DHreact = − 250 kJ/mol                                                           (1)

Note that the product P is sparingly soluble in ethanol, which helps facilitate its removal from the reaction solution.  It can be assumed that the reaction rate is first-order in both the concentration of A (cA) and B (cB), and so second-order 

The volume and initial amounts of the two reactants have been specified initially to be 500 L, 120 moles and 120 moles respectively; but there is no reason why these are optimal or indeed cannot be changed to increase the production rate. 

The evidence would suggest that the production rate is enhanced by having the solvent reasonably saturated with A and B.  What does this say about initial amounts of A and B?

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