(a) Derive the design performance equation for a constant volume batch reactor given i. zero order kinetics ii. first order kinetics iii. second order kinetics (uni-molecular)

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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2.
(a)
Derive the design performance equation for a constant volume batch reactor
given
i. zero order kinetics
ii. first order kinetics
ii.
second order kinetics (uni-molecular)
iv. second order kinetics (bi-molecular)
(b)
Acetic anhydride is hydrolysed by water to form acetic acid in accordance with the
equation:
(CH,CO),0+H,0 2CH,COOH
In dilute aqueous solution where water is in vast excess, the reaction is irreversible
and pseudo first order with respect to acetic anhydride. The variation of the pseudo
first order rate constant with temperature is as follows:
Temperature
(°C)
K
15
20
25
30
288
293
298
303
Rate Constant
(s)
0.00134
0.00188
0.00263
0.00351
A batch reactor for carrying out this hydrolysis is charged with an acetic anhydride
solution containing 0.30 kmol/m at 15 °C. The specific heat and density of the
solution are 3.8 kJ/kg.K and 1070 kg/m', and may be taken as constant throughout
the course of the reaction. The reaction is exothermic and the heat of reaction per
kmol anhydride is 210,000 kJ/kmol. If the reactor is operated adiabatically, estimate
the time required for the hydrolysis of 80% of the anhydride.
i. Solve the integral algebraically (assume an average value for k)
ii. Solve the integral using the trapezium rule
Transcribed Image Text:2. (a) Derive the design performance equation for a constant volume batch reactor given i. zero order kinetics ii. first order kinetics ii. second order kinetics (uni-molecular) iv. second order kinetics (bi-molecular) (b) Acetic anhydride is hydrolysed by water to form acetic acid in accordance with the equation: (CH,CO),0+H,0 2CH,COOH In dilute aqueous solution where water is in vast excess, the reaction is irreversible and pseudo first order with respect to acetic anhydride. The variation of the pseudo first order rate constant with temperature is as follows: Temperature (°C) K 15 20 25 30 288 293 298 303 Rate Constant (s) 0.00134 0.00188 0.00263 0.00351 A batch reactor for carrying out this hydrolysis is charged with an acetic anhydride solution containing 0.30 kmol/m at 15 °C. The specific heat and density of the solution are 3.8 kJ/kg.K and 1070 kg/m', and may be taken as constant throughout the course of the reaction. The reaction is exothermic and the heat of reaction per kmol anhydride is 210,000 kJ/kmol. If the reactor is operated adiabatically, estimate the time required for the hydrolysis of 80% of the anhydride. i. Solve the integral algebraically (assume an average value for k) ii. Solve the integral using the trapezium rule
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