Problem 3. Acetylene is produced from methane in the reaction C2H2 (g) 3H2 (g) 2CH4 (g) An undesired side reaction is the decomposition of acetylene: 2C(s) + H2(g) C2H2(g) Methane is fed to the reactor at 1500°C at a rate of 10 mol/s. Heat is transferred to the reactor at a rate of 975 kW. The product temperature is 1500°C and the fractional conversion of methane is 0.600. A flowchart of the process and an enthalpy table are shown below 975 kW Product at 1500 °C Feed at 1500°C REACTOR mol CH/s) i(mol CH/s) ig(mol H/s) ig(mol C/s) 10.0 mol CH/s References: C(s), H2(g), at 25°C, 1 atm Hin (kJ/mol Нou (kJ/mol йin (mol/s nout (mol/s) Substance й CH4 10.0 41.65 На |СНа йz Нз На йз На C a) Using the heat capacities and enthalpies given below, determine the product component flow rates and the yield of acetylene (mol C2H2 produced/mol CH4 consumed) Hints: . Consider all available equations, and ii. Atomic balances are more than a midterm gimmick Cp (methane) 0.079 kJ/mol-C Cp (acetylene) = 0.052 kJ/mol-°C Cp (hydrogen) 0.031 kJ/molC Cp (carbon, solid) 0.022 kJ/mol°C kJ AH (methane) = -74.8- mol kJ AH, (acetylene) = 226.75- mol b) The reaction efficiency may be defined as the ratio (actual acetylene produced/acetylene produced with no side reaction). What is the efficiency of this reaction?
Problem 3. Acetylene is produced from methane in the reaction C2H2 (g) 3H2 (g) 2CH4 (g) An undesired side reaction is the decomposition of acetylene: 2C(s) + H2(g) C2H2(g) Methane is fed to the reactor at 1500°C at a rate of 10 mol/s. Heat is transferred to the reactor at a rate of 975 kW. The product temperature is 1500°C and the fractional conversion of methane is 0.600. A flowchart of the process and an enthalpy table are shown below 975 kW Product at 1500 °C Feed at 1500°C REACTOR mol CH/s) i(mol CH/s) ig(mol H/s) ig(mol C/s) 10.0 mol CH/s References: C(s), H2(g), at 25°C, 1 atm Hin (kJ/mol Нou (kJ/mol йin (mol/s nout (mol/s) Substance й CH4 10.0 41.65 На |СНа йz Нз На йз На C a) Using the heat capacities and enthalpies given below, determine the product component flow rates and the yield of acetylene (mol C2H2 produced/mol CH4 consumed) Hints: . Consider all available equations, and ii. Atomic balances are more than a midterm gimmick Cp (methane) 0.079 kJ/mol-C Cp (acetylene) = 0.052 kJ/mol-°C Cp (hydrogen) 0.031 kJ/molC Cp (carbon, solid) 0.022 kJ/mol°C kJ AH (methane) = -74.8- mol kJ AH, (acetylene) = 226.75- mol b) The reaction efficiency may be defined as the ratio (actual acetylene produced/acetylene produced with no side reaction). What is the efficiency of this reaction?
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:Problem 3.
Acetylene is produced from methane in the reaction
C2H2 (g) 3H2 (g)
2CH4 (g)
An undesired side reaction is the decomposition of acetylene:
2C(s) + H2(g)
C2H2(g)
Methane is fed to the reactor at 1500°C at a rate of 10 mol/s. Heat is transferred to the reactor
at a rate of 975 kW. The product temperature is 1500°C and the fractional conversion of methane
is 0.600. A flowchart of the process and an enthalpy table are shown below
975 kW
Product at 1500 °C
Feed at 1500°C
REACTOR mol CH/s)
i(mol CH/s)
ig(mol H/s)
ig(mol C/s)
10.0 mol CH/s
References: C(s), H2(g), at 25°C, 1 atm
Hin
(kJ/mol
Нou
(kJ/mol
йin
(mol/s
nout
(mol/s)
Substance
й
CH4
10.0
41.65
На
|СНа
йz
Нз
На
йз
На
C
a) Using the heat capacities and enthalpies given below, determine the product component
flow rates and the yield of acetylene (mol C2H2 produced/mol CH4 consumed)
Hints: . Consider all available equations, and
ii. Atomic balances are more than a midterm gimmick
Cp (methane) 0.079 kJ/mol-C
Cp (acetylene) = 0.052 kJ/mol-°C
Cp (hydrogen) 0.031 kJ/molC
Cp (carbon, solid) 0.022 kJ/mol°C
kJ
AH (methane) = -74.8-
mol
kJ
AH, (acetylene) = 226.75-
mol
b) The reaction efficiency may be defined as the ratio (actual acetylene produced/acetylene
produced with no side reaction). What is the efficiency of this reaction?
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