10. 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.
10. 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
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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Heat and
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Transcribed Image Text:10. 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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