A fuel gas contains 80% propane (C3H8) by mole and 20% butane (C4H10) by mole. The fuel, mixed with a recycle stream is fed to a furnace, where conversions of 80% propane and 50% butane are achieved. The fuel in the furnace is burned with 20% excess air via complete combustion. In the outlet of furnace all of the propane and butane is separated by a filter and this stream containing equimolar amounts of propane and butane is recycled to the reactor inlet. The remaining stack gas is released. The CO2:O2 ratio in the stack gas is found to be 16.0:19.1a)Determine the composition stack gas on wet basis.b)Determine the ratio of fresh feed propane/recycled propane.

Given data: Fuel gas contains 80% propane and 20% butane by mole. In the furnace, conversion of 80%…

Answered: A fuel gas contains 80% propane (C3H8)…

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

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A fuel gas contains 80% propane (C₃H₈) by mole and 20% butane (C₄H₁₀) by mole. The fuel, mixed with a recycle stream is fed to a furnace, where conversions of 80% propane and 50% butane are achieved. The fuel in the furnace is burned with 20% excess air via complete combustion. In the outlet of furnace all of the propane and butane is separated by a filter and this stream containing equimolar amounts of propane and butane is recycled to the reactor inlet. The remaining stack gas is released. The CO₂:O₂ ratio in the stack gas is found to be 16.0:19.1

a)Determine the composition stack gas on wet basis.

b)Determine the ratio of fresh feed propane/recycled propane.

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