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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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Question

Three fixed-bed adsorbers containing 10,000 lb of granules of
activated carbon (ρ_b=30 lb/ft³) each are to be used to treat 250 gpm of water containing 0.185 mg/L of benzene (B) and 0.583 mg/L of m-xylene (X). However, because the two solutes may have considerably different breakthrough times, more than two operating beds in series may be needed. Adsorption isotherms are given, where q is in mg/g and c in mg/L. From laboratory measurements, widths of the mass-transfer zones are estimated to be MTZ_B = 2.5 ft and MTZ_X =4.8 ft. Once the cycle is established, how often must the carbon be replaced?

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