Trisodium phosphate is to be recovered as Na3PO4·12H2O from a 35 weight percent solution originally at 90 °C by cooling ans seeding in a Swenson-Walker crystallizer. From 10,000 kg/h of feed, 3,500 kg/h of product crystals in addition to the seed crystals are to be obtained. Seed crystals fed at a rate of 250 kg/h have the following size range: Size Range (mm) Mass Fraction - 0.500 + 0.250 0.10 - 0.250 + 0.130 0.20 - 0.130 + 0.065 0.40 - 0.065 + 0.025 0.30 Latent heat of crystallization for trisodium phosphate is 64.0 x 106 J/kg-mole. Specific heat for the trisodium phosphate solution may be taken as 3,350 J/kg-K. a. Estimate the product particle size distribution. b. To what temperature must the solution be cooled, and what will be the cooling duty in Watts?
Trisodium phosphate is to be recovered as Na3PO4·12H2O from a 35 weight percent solution originally at 90 °C by cooling ans seeding in a Swenson-Walker crystallizer. From 10,000 kg/h of feed, 3,500 kg/h of product crystals in addition to the seed crystals are to be obtained. Seed crystals fed at a rate of 250 kg/h have the following size range: Size Range (mm) Mass Fraction - 0.500 + 0.250 0.10 - 0.250 + 0.130 0.20 - 0.130 + 0.065 0.40 - 0.065 + 0.025 0.30 Latent heat of crystallization for trisodium phosphate is 64.0 x 106 J/kg-mole. Specific heat for the trisodium phosphate solution may be taken as 3,350 J/kg-K. a. Estimate the product particle size distribution. b. To what temperature must the solution be cooled, and what will be the cooling duty in Watts?
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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Trisodium phosphate is to be recovered as Na3PO4·12H2O from a 35 weight percent
solution originally at 90 °C by cooling ans seeding in a Swenson-Walker crystallizer. From
10,000 kg/h of feed, 3,500 kg/h of product crystals in addition to the seed crystals are to be
obtained. Seed crystals fed at a rate of 250 kg/h have the following size range:
Size Range (mm) Mass Fraction
- 0.500 + 0.250 0.10
- 0.250 + 0.130 0.20
- 0.130 + 0.065 0.40
- 0.065 + 0.025 0.30
Latent heat of crystallization for trisodium phosphate is 64.0 x 106 J/kg-mole. Specific heat
for the trisodium phosphate solution may be taken as 3,350 J/kg-K.
a. Estimate the product particle size distribution.
b. To what temperature must the solution be cooled, and what will be the cooling duty
in Watts?
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