Fifty thousand lb/h of a 20 wt% aqueous solution of NaOH at 120oF is to be fed to an evaporator operating at 3.7 psia, where the solution is concentrated to 40 wt% NaOH. The heating medium is saturated steam at a temperature 40oF higher than the exiting temperature of the caustic solution. Determine the: (a) boiling-point elevation of the solution; (b) saturated-heating-steam temperature and pressure; (c) evaporation rate; (d) heat-transfer rate; (e) heatingsteam flow rate; (f) economy; and (g) heat-transfer area if U=300 Btu/h-ft2-oF.
Fifty thousand lb/h of a 20 wt% aqueous solution of NaOH at 120oF is to be fed to an evaporator operating at 3.7 psia, where the solution is concentrated to 40 wt% NaOH. The heating medium is saturated steam at a temperature 40oF higher than the exiting temperature of the caustic solution. Determine the: (a) boiling-point elevation of the solution; (b) saturated-heating-steam temperature and pressure; (c) evaporation rate; (d) heat-transfer rate; (e) heatingsteam flow rate; (f) economy; and (g) heat-transfer area if U=300 Btu/h-ft2-oF.
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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Fifty thousand lb/h of a 20 wt% aqueous solution of NaOH at 120oF is to be fed to an evaporator operating at 3.7 psia, where the solution is concentrated to 40 wt% NaOH. The heating medium is saturated steam at a temperature 40oF higher than the exiting temperature of the caustic solution. Determine the: (a) boiling-point elevation of the solution; (b) saturated-heating-steam temperature and pressure; (c) evaporation rate; (d) heat-transfer rate; (e) heatingsteam flow rate; (f) economy; and (g) heat-transfer area if U=300 Btu/h-ft2-oF.
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