An evaporator is used to concentrate 4536 kg/h (10000 lbm/h) of a 20% solution of NaOH in water entering at 60°C to a product of 50% solids. The pressure of the saturated steam used is 172.4 kPa and the pressure in the vapor space of the evaporator is 11.7 kPa. The overall heat transfer coefficient is 1560 W/m²-K. Calculate the A. The boiling point rise? (Ans: 40.6°F) B. The enthalpy of the superheated vapor? (Ans: 2667 kJ/kg)
An evaporator is used to concentrate 4536 kg/h (10000 lbm/h) of a 20% solution of NaOH in water entering at 60°C to a product of 50% solids. The pressure of the saturated steam used is 172.4 kPa and the pressure in the vapor space of the evaporator is 11.7 kPa. The overall heat transfer coefficient is 1560 W/m²-K. Calculate the A. The boiling point rise? (Ans: 40.6°F) B. The enthalpy of the superheated vapor? (Ans: 2667 kJ/kg)
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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Transcribed Image Text:An evaporator is used to concentrate 4536 kg/h (10000 lbm/h) of a 20% solution of NaOH
in water entering at 60°C to a product of 50% solids. The pressure of the saturated steam
used is 172.4 kPa and the pressure in the vapor space of the evaporator is 11.7 kPa. The
overall heat transfer coefficient is 1560 W/m²-K. Calculate the
A. The boiling point rise? (Ans: 40.6°F)
B. The enthalpy of the superheated vapor? (Ans: 2667 kJ/kg)
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