EXAMPLE 8.4-3. Evaporation of an NaOH Solution An evaporator is used to concentrate 4536 kg/h (10000 lb/h) of a 20% solution of NaOH in water entering at 60°C (140°F) to a product of 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 ft2.F). Calcu- late the steam used, the steam economy in kg vaporized/kg steam used, and the heating surface area in m2.
EXAMPLE 8.4-3. Evaporation of an NaOH Solution An evaporator is used to concentrate 4536 kg/h (10000 lb/h) of a 20% solution of NaOH in water entering at 60°C (140°F) to a product of 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 ft2.F). Calcu- late the steam used, the steam economy in kg vaporized/kg steam used, and the heating surface area in m2.
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:EXAMPLE 8.4-3. Evaporation of an NaOH Solution
An evaporator is used to concentrate 4536 kg/h (10000 lb/h) of a 20%
solution of NaOH in water entering at 60°C (140°F) to a product of 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 ft2. °F). Calcu-
late the steam used, the steam economy in kg vaporized/kg steam used, and
the heating surface area in m2.
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