Methane and oxygen react in the presence of a catalyst to form formaldehyde. In a parallel reaction, methane is oxidised to carbon dioxide and water: CH,+ 02 → HCHO + H2O CH4 +202 → CO₂ + 2H₂O The feed to the reactor contains equimolar amounts of methane and oxygen. Assume a basis of 100 mol feed/s. a) Draw and label a flowchart. Use a degree-of-freedom analysis based on extents of reaction to determine how many process variable values must be specified for the remaining variable values to be calculated. b) Use the following equation to derive expressions for the product stream component flow rates in terms of the two extents of reaction, ₁ and 2. n =nio + vijej c) The fractional conversion of methane is 0.900 and the fractional yield of formaldehyde is 0.855. Calculate the molar composition of the reactor output stream and the selectivity of formaldehyde production relative to carbon dioxide production.
Methane and oxygen react in the presence of a catalyst to form formaldehyde. In a parallel reaction, methane is oxidised to carbon dioxide and water: CH,+ 02 → HCHO + H2O CH4 +202 → CO₂ + 2H₂O The feed to the reactor contains equimolar amounts of methane and oxygen. Assume a basis of 100 mol feed/s. a) Draw and label a flowchart. Use a degree-of-freedom analysis based on extents of reaction to determine how many process variable values must be specified for the remaining variable values to be calculated. b) Use the following equation to derive expressions for the product stream component flow rates in terms of the two extents of reaction, ₁ and 2. n =nio + vijej c) The fractional conversion of methane is 0.900 and the fractional yield of formaldehyde is 0.855. Calculate the molar composition of the reactor output stream and the selectivity of formaldehyde production relative to carbon dioxide production.
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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Transcribed Image Text:Methane and oxygen react in the presence of a catalyst to form formaldehyde. In a parallel reaction,
methane is oxidised to carbon dioxide and water:
CH4+ 02 → HCHO + H2O
CH4 + 202 → CO₂ + 2H₂O
The feed to the reactor contains equimolar amounts of methane and oxygen. Assume a basis of 100
mol feed/s.
a) Draw and label a flowchart. Use a degree-of-freedom analysis based on extents of reaction to
determine how many process variable values must be specified for the remaining variable
values to be calculated.
b) Use the following equation to derive expressions for the product stream component flow rates
in terms of the two extents of reaction, 5₁ and 52.
n₁ = nio +
vijšj
c) The fractional conversion of methane is 0.900 and the fractional yield of formaldehyde is
0.855. Calculate the molar composition of the reactor output stream and the selectivity of
formaldehyde production relative to carbon dioxide production.
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