Answered: Diffusion of hydrogen through a steel…

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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Diffusion of hydrogen through a steel wall.
Hydrogen at 150 psia and 80^oF is stored in a spherical, steel pressure vessel of inside diameter 4 inches and a wall thickness of 0.125 inch. The solubility of hydrogen in steel is 0.094 lbmol/ft³,and the diffusivity of hydrogen in steel is 3.0 x10^-9 cm²/s. If the inner surface of the vessel remains saturated at the existing hydrogen pressure and the hydrogen partial pressure at the outer surfaceis assumed to be zero, estimate the: (a) initial rate of mass transfer of hydrogen through the wall; (b) initial rate of pressure decrease inside the vessel; and (c) time in hours for the pressure to decrease to 50 psia, assuming the temperature stays constant at 80^oF.

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