Preventing runaway reactions is a major safety consideration for exothermic chemical processes. In a process used to produce aniline (C6H¬N), which is an important precursor for many industries, nitrobenzene is hydrogenated in the reaction below with the assistance of a catalyst. C6H5NO2 (g) + 3H2 (g) C6H¬N (g) + 2H2O (g) AHr (T = 250 °C, P = 15 bar) = -443 kJ a) Consider a continuous, steady-state reactor where nitrobenzene enters at a flowrate of 115 mol/min, hydrogen is fed at 160% molar excess, and both streams are at 250 °C. In this reactor, which operates at 15 bar, a 98% conversion of nitrobenzene to aniline is achieved, and the reactor is maintained at 250 °C with the use of a heat exchanger. If water enters the heat exchanger as a liquid at 25 °C and 1 atm, and exits as saturated steam at 8.0 bar, what flow rate of cooling water (in kg/min) is being used and what is the temperature of the steam exiting the heat exchanger? Please assume that there is only negligible heat loss to the environment and that gases behave ideally. Hint: Using the steam tables can save time for some enthalpy calculations.
Preventing runaway reactions is a major safety consideration for exothermic chemical processes. In a process used to produce aniline (C6H¬N), which is an important precursor for many industries, nitrobenzene is hydrogenated in the reaction below with the assistance of a catalyst. C6H5NO2 (g) + 3H2 (g) C6H¬N (g) + 2H2O (g) AHr (T = 250 °C, P = 15 bar) = -443 kJ a) Consider a continuous, steady-state reactor where nitrobenzene enters at a flowrate of 115 mol/min, hydrogen is fed at 160% molar excess, and both streams are at 250 °C. In this reactor, which operates at 15 bar, a 98% conversion of nitrobenzene to aniline is achieved, and the reactor is maintained at 250 °C with the use of a heat exchanger. If water enters the heat exchanger as a liquid at 25 °C and 1 atm, and exits as saturated steam at 8.0 bar, what flow rate of cooling water (in kg/min) is being used and what is the temperature of the steam exiting the heat exchanger? Please assume that there is only negligible heat loss to the environment and that gases behave ideally. Hint: Using the steam tables can save time for some enthalpy calculations.
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
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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Transcribed Image Text:Preventing runaway reactions is a major safety consideration for
3)
exothermic chemical processes. In a process used to produce aniline (C6H¬N),
which is an important precursor for many industries, nitrobenzene is
hydrogenated in the reaction below with the assistance of a catalyst.
C6H5NO2
+ 3H2 (g)
→ C6H¬N
+ 2H2O (g)
(g)
(g)
AHr (T = 250 °C, P = 15 bar) = -443 kJ
%3D
a) Consider a continuous, steady-state reactor where nitrobenzene enters at a
flowrate of 115 mol/min, hydrogen is fed at 160% molar excess, and both
streams are at 250 °C. In this reactor, which operates at 15 bar, a 98%
conversion of nitrobenzene to aniline is achieved, and the reactor is
maintained at 250 °C with the use of a heat exchanger. If water enters the heat
exchanger as a liquid at 25 °C and 1 atm, and exits as saturated steam at 8.0
bar, what flow rate of cooling water (in kg/min) is being used and what is the
temperature of the steam exiting the heat exchanger? Please assume that there
is only negligible heat loss to the environment and that gases behave ideally.
Hint: Using the steam tables can save time for some enthalpy calculations.
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