In a laboratory drying test with a solid material the following relation for the falling rate period was obtained dX dt = -0.8(X - 0.05) Where X is the moisture content on dry basis and t is the time in hours. The critical moisture content is 1.4 kg moisture per kg dry solid. Calculate the time required for drying the material from X₁=4.0 to X₂=1.4 and the equilibrium moisture content.

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
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18. In a laboratory drying test with a solid material the following relation for the falling rate
period was obtained
dX
dt
= -0.8(X-0.05)
Where X is the moisture content on dry basis and t is the time in hours. The critical moisture
content is 1.4 kg moisture per kg dry solid. Calculate the time required for drying the
material from X₁-4.0 to X₂=1.4 and the equilibrium moisture content.
Transcribed Image Text:18. In a laboratory drying test with a solid material the following relation for the falling rate period was obtained dX dt = -0.8(X-0.05) Where X is the moisture content on dry basis and t is the time in hours. The critical moisture content is 1.4 kg moisture per kg dry solid. Calculate the time required for drying the material from X₁-4.0 to X₂=1.4 and the equilibrium moisture content.
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