A mixture of methane and air is capable of being ignited only if the mole percent of methane is between 5% and 15%. A mixture containing 9.0 mol% methane in air that is flowing at a rate of 700 kg/hour is to be diluted with pure air to reduce the methane concentration to the lower flammability limit. a) What is the required flow rate in kmol/hour of pure air needed to lower the methane concentration to 5.0 mol%? b) What is the flow rate of oxygen in kg/hour in the product gas with 5.0 mol% methane?

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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A mixture of methane and air is capable of being ignited only if the mole percent of methane is between 5% and 15%.

A mixture containing 9.0 mol% methane in air that is flowing at a rate of 700 kg/hour is to be diluted with pure air to reduce the methane concentration to the lower flammability limit.

a) What is the required flow rate in kmol/hour of pure air needed to lower the methane concentration to 5.0 mol%?

b) What is the flow rate of oxygen in kg/hour in the product gas with 5.0 mol% methane?

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