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A feed containing 3 wt.% dissolved organic solids in water is fed to a double effect  evaporator with reverse feed. The feed enters at 130 °F and is concentrated to 20 wt.%  solids. The boiling point rise can be considered negligible, as can the heat of solution. Each  evaporator has a 1100 ft2 surface area, and the heat transfer coefficients are U1 = 600 and  U2 = 750 BTU/h·ft2 ·°F. The feed enters evaporator number 2 and steam at 125 psia is fed  to evaporator number 1. The pressure in the vapor space of evaporator number 2 is 1 psia.  Assume that the heat capacity of all liquid solutions is that of liquid water. Calculate the  feed rate and the product of a solution containing 20 wt.% solids

A feed containing 3 wt.% dissolved organic solids in water is fed to a double effect  evaporator with reverse feed. The feed enters at 130 °F and is concentrated to 20 wt.%  solids. The boiling point rise can be considered negligible, as can the heat of solution. Each  evaporator has a 1100 ft2 surface area, and the heat transfer coefficients are U1 = 600 and  U2 = 750 BTU/h·ft2 ·°F. The feed enters evaporator number 2 and steam at 125 psia is fed  to evaporator number 1. The pressure in the vapor space of evaporator number 2 is 1 psia.  Assume that the heat capacity of all liquid solutions is that of liquid water. Calculate the  feed rate and the product of a solution containing 20 wt.% solids

Introduction to Chemical Engineering Thermodynamics
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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A feed containing 3 wt.% dissolved organic solids in water is fed to a double effect 
evaporator with reverse feed. The feed enters at 130 °F and is concentrated to 20 wt.% 
solids. The boiling point rise can be considered negligible, as can the heat of solution. Each 
evaporator has a 1100 ft2 surface area, and the heat transfer coefficients are U1 = 600 and 
U2 = 750 BTU/h·ft2
·°F. The feed enters evaporator number 2 and steam at 125 psia is fed 
to evaporator number 1. The pressure in the vapor space of evaporator number 2 is 1 psia. 
Assume that the heat capacity of all liquid solutions is that of liquid water. Calculate the 
feed rate and the product of a solution containing 20 wt.% solids  

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