Air containing 5.0 mol% NH3 is to be scrubbed (for 99% absorption of NH3) counter-currently with water in an absorption tower. The inlet gas rate is 95 kmol/hr of gas mixture. Assume that the temperature is constant at 25O C and the total pressure is 1 atm. The KGa is 62.4 kmol/hr.m3 .atm. The equilibrium relationship of NH3-H2O system is given by y* = 0.987x. (a) Determine the minimum liquid rate. (b) For liquid rate 1.5 times of the minimum, determine the number of theoretical plates required, using an overall log mean driving force. (c) Calculate the height of tower required, if the gas rate is 3600 kg/hr.m2 .
Air containing 5.0 mol% NH3 is to be scrubbed (for 99% absorption of NH3) counter-currently with water in an absorption tower. The inlet gas rate is 95 kmol/hr of gas mixture. Assume that the temperature is constant at 25O C and the total pressure is 1 atm. The KGa is 62.4 kmol/hr.m3 .atm. The equilibrium relationship of NH3-H2O system is given by y* = 0.987x. (a) Determine the minimum liquid rate. (b) For liquid rate 1.5 times of the minimum, determine the number of theoretical plates required, using an overall log mean driving force. (c) Calculate the height of tower required, if the gas rate is 3600 kg/hr.m2 .
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
Problem 1.1P
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Question
Air containing 5.0 mol% NH3 is to be scrubbed (for 99% absorption of NH3) counter-currently
with water in an absorption tower. The inlet gas rate is 95 kmol/hr of gas mixture. Assume that the
temperature is constant at 25O
C and the total pressure is 1 atm. The KGa is 62.4 kmol/hr.m3
.atm. The
equilibrium relationship of NH3-H2O system is given by y* = 0.987x.
(a) Determine the minimum liquid rate.
(b) For liquid rate 1.5 times of the minimum, determine the number of theoretical plates required, using
an overall log mean driving force.
(c) Calculate the height of tower required, if the gas rate is 3600 kg/hr.m2
.
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