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An evaporator is used to concentrated 4536 kg/h (10 000 lb/h) of a 20% solution of NaOH in water entering at 60°C (140°F) to a product 50% solids. The pressure of the saturated steam used is 172.4 kPa (25 psia) and the pressure in the vapor space of the evaporator is 11.7 kPa (1.7 psia). The overall-heat transfer coefficient is 1560 W/m²-K (275 BTU/h-ft-°F). Calculate the steam used, the steam economy in kg vaporized/kg steam used, and the heating surface area in m².

An evaporator is used to concentrated 4536 kg/h (10 000 lb/h) of a 20% solution of NaOH in water entering at 60°C (140°F) to a product 50% solids. The pressure of the saturated steam used is 172.4 kPa (25 psia) and the pressure in the vapor space of the evaporator is 11.7 kPa (1.7 psia). The overall-heat transfer coefficient is 1560 W/m²-K (275 BTU/h-ft-°F). Calculate the steam used, the steam economy in kg vaporized/kg steam used, and the heating surface area in m².

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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EXAMPLES: An evaporator is used to concentrated 4536 kg/h (10 000 lb/h) of a 20% solution of NaOH in water entering at 60°C (140°F) to a product 50% solids. The pressure of the saturated steam used is 172.4 kPa (25 psia) and the pressure in the vapor space of the evaporator is 11.7 kPa (1.7 psia). The overall-heat transfer coefficient is 1560 W/m²-K (275 BTU/h-ft-°F). Calculate the steam used, the steam economy in kg vaporized/kg steam used, and the heating surface area in m².
Transcribed Image Text:EXAMPLES: An evaporator is used to concentrated 4536 kg/h (10 000 lb/h) of a 20% solution of NaOH in water entering at 60°C (140°F) to a product 50% solids. The pressure of the saturated steam used is 172.4 kPa (25 psia) and the pressure in the vapor space of the evaporator is 11.7 kPa (1.7 psia). The overall-heat transfer coefficient is 1560 W/m²-K (275 BTU/h-ft-°F). Calculate the steam used, the steam economy in kg vaporized/kg steam used, and the heating surface area in m².
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