heat (kJ/h) to or from the reactor to maintain the temperature in the reactor
Formaldehyde (HCHO) is produced in a continuous reactor by oxidation of methane with pure oxygen, according to the reaction:
CH4(g) + O2(g) ------ HCHO(g) +H2O(v) (1)
CH4(g) +2O2(g) ……CO2(g) + 2H2O(v) (2) undesirable reaction
Calculate the heat (kJ/h) to or from the reactor to maintain the temperature in the reactor at 150°C. Neglect changes in kinetic and potential energy. Make a table of degrees of freedom.
Quantitative diagram
Average Heat Capacities: Heats of Formation
(Cp)CH4(g) = 34.31 J/mol. C (∆Ĥf) CH4(g) = -74.85 kJ/mol
(Cp)HCHO(g) = 34.28 J/mol. C (∆Ĥf) HCHO(g) = -115.9 kJ/mol
(Cp)CO2(g) = 36.11 J/mol. C (∆Ĥf) CO2(g) = - 393.5kJ/mol
(Cp)H2O(v) = 33.46 J/mol. C (∆Ĥf) H2O(v) = -241.83 kJ/mol
(Cp)O2(g) = 29.11 J/mol. C (∆Ĥf) O2(g) = 0 kJ/mol
T(°C), Cp (kJ/mol.C)
Take as reference: CH4 (g, 25°C), HCHO (g, 25°C) , CO2(g, 25°C), H2O(g, 25°C), O2(g, 25°C)
Neglect changes in kinetic and potential energy. Make a table of degrees of freedom.
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