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Evaporation is to be used to concentrate 3000 kg/h of a 10% solution of NaOH in water entering at 70°C to a product of 45% solids. Saturated steam at 198.53 kPa (120°C) is to be used. A single-effect evaporator is used and the overall heat-transfer coefficient is 1500 W/(m?xK). Calculate the temperature (boiling point of the liquid) in the evaporator, the steam required (kg/h), the steam economy (kg water vaporized per kg steam used), and the heating surface area (m2) if the pressure in the vapor space of the evaporator is 25.03 kPa.

Evaporation is to be used to concentrate 3000 kg/h of a 10% solution of NaOH in water entering at 70°C to a product of 45% solids. Saturated steam at 198.53 kPa (120°C) is to be used. A single-effect evaporator is used and the overall heat-transfer coefficient is 1500 W/(m?xK). Calculate the temperature (boiling point of the liquid) in the evaporator, the steam required (kg/h), the steam economy (kg water vaporized per kg steam used), and the heating surface area (m2) if the pressure in the vapor space of the evaporator is 25.03 kPa.

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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Evaporation is to be used to concentrate 3000 kg/h of a 10% solution of NaOH in water entering at 70°C to a product of 45% solids. Saturated steam at 198.53 kPa (120°C) is to be used. A single-effect evaporator is used and the overall heat-transfer coefficient is 1500 W/(m?xK). Calculate the temperature (boiling point of the liquid) in the evaporator, the steam required (kg/h), the steam economy (kg water vaporized per kg steam used), and the heating surface area (m?) if the pressure in the vapor space of the evaporator is 25.03 kPa.
Transcribed Image Text:Evaporation is to be used to concentrate 3000 kg/h of a 10% solution of NaOH in water entering at 70°C to a product of 45% solids. Saturated steam at 198.53 kPa (120°C) is to be used. A single-effect evaporator is used and the overall heat-transfer coefficient is 1500 W/(m?xK). Calculate the temperature (boiling point of the liquid) in the evaporator, the steam required (kg/h), the steam economy (kg water vaporized per kg steam used), and the heating surface area (m?) if the pressure in the vapor space of the evaporator is 25.03 kPa.
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