Answered: Hydrogen Sulfide has to be removed from…

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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Hydrogen Sulfide has to be removed from a light refinery hydrocarbon stream before (40) the gas is subject to further processing. The feed gas contains 4.0 mole% H2S, and
98% of which has to be removed by absorption with a weak aqueous basic solution
in a packed column. The feed gas rate is 80 kmol/h, and the entering solution has negligible amount of H2S.

The concentration of H2S in the absorbent solution leaving the column is 0.015 mole H2S per mole of the H2S-free liquid. The equilibrium relation is linear and is given by y = 1.95 x. The 1.0 m diameter column operates at 25oC and 101.3 kPa total pressure. If the overall gas-phase film coefficient is Kya = 130 kmol/m3.h.∆y, calculate –

(a) the molar flowrate of entering liquid solution, L (b) the number of transfer units, NOG

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