Two ton/h of the dodecahydrate of sodium phosphate (Na3PO4 .12H2O) is to be crystallized by cooling, in a cooling crystallizer, an aqueous solution that enters saturated at 40oC and leaves at 20oC. Chilled cooling water flows countercurrently, entering at 10oC and exiting at 25oC. The overall heat-transfer coefficient is 20 Btu/h-ft2 -oF. Solution average specific heat is 0.80 cal/g-oC. Estimate the: (a) tons (2,000 lb) per hour of feed solution; (b) heat-transfer area in ft2 ; (c) number of crystallizer units required if each 10-ft-long unit contains 30 ft2 of heat-transfer surface.
Two ton/h of the dodecahydrate of sodium phosphate (Na3PO4 .12H2O) is to be crystallized by cooling, in a cooling crystallizer, an aqueous solution that enters saturated at 40oC and leaves at 20oC. Chilled cooling water flows countercurrently, entering at 10oC and exiting at 25oC. The overall heat-transfer coefficient is 20 Btu/h-ft2 -oF. Solution average specific heat is 0.80 cal/g-oC. Estimate the: (a) tons (2,000 lb) per hour of feed solution; (b) heat-transfer area in ft2 ; (c) number of crystallizer units required if each 10-ft-long unit contains 30 ft2 of heat-transfer surface.
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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Two ton/h of the dodecahydrate of sodium phosphate (Na3PO4 .12H2O) is to be crystallized by cooling, in a cooling crystallizer, an aqueous solution that enters saturated at 40oC and leaves at 20oC. Chilled cooling water flows countercurrently, entering at 10oC and exiting at 25oC. The overall heat-transfer coefficient is 20 Btu/h-ft2 -oF. Solution average specific heat is 0.80 cal/g-oC. Estimate the: (a) tons (2,000 lb) per hour of feed solution; (b) heat-transfer area in ft2 ; (c) number of crystallizer units required if each 10-ft-long unit contains 30 ft2 of heat-transfer surface.
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