Latihan Soal - Single Reaction and Combustion Reaction 1 - AUTOSCORING [PDF]

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25



Nilai Anda



Nama



AZAS TEKNIK KIMIA I TOPIK : NERACA MASSA DENGAN REAKSI (SINGLE REACTION DAN COMBUSTION REACTION)



PROBLEM 1. SUB-TOTAL 100 Methanol is dehydrogenated in a catalytic reactor to form formaldehyde in the reaction: CH3OH → HCHO + H2 Formaldehyde in the reactor product is separated from the unreacted methanol and hydrogen. The production rate of formaldehyde is 30 kmol. If the conversion is 60%, calculate the required feed rate of methanol to the process in kmol. Solution : production rate of HCHO = fractional conversion = Component



30



kmol



0.60



F mol fract.



CH3OH HCHO H2 Total



mol 1 0 0 1



50 0 0 50



REACTION P1 coef. mol mol fract. -1 -30 0 1 30 1 1 30 0 30 1



mol 0 30 0 30



PROBLEM 2. SUB-TOTAL 0 The molar feed rate to a continuous ammonia synthesis reactor is 100 mol/min nitrogen, 150 mol/min hydrogen. The ammonia formation reaction is N2 +3H2 → 2NH3 The percent conversion of the limiting reactant in the reactor is 60.0%. Determine the molar flow rate of limiting reactant in the reactor effluent stream?



Solution : F Component mol fract. N2 H2 NH3 Total



REACTION mol (mol/min)



coef.



P



mol (mol/min) mol fract. mol (mol/min)



PROBLEM 3. SUB-TOTAL 0 Butane is completely burned in a process fed with 25.0% excess air. Based on 1 mol/h of butane, determine the composition in mole fractions of oxygen in product stream. Solution : Basis : Component



mole of butane = B mole fract.



mol



mol/h



A mole fract.



mol



REACTION coef. mol



C4H10 O2 N2 CO2 H2O Total



PROBLEM 4. SUB-TOTAL 0 One hundred mol/h of butane and 5000 mol/h of air are fed into a combustion reactor. Calculate the percent excess The combustion reaction: 2C4H10 + 13O2 → 8CO2 + 10H2O



Solution : Basis :



Component C4H10 O2 N2 CO2 H2O Total



mole of butane =



G mole fract.



mol



mol/h



A mole fract.



mol



REACTION coef. mol



Nama



NIM



N)



tion:



d hydrogen. The equired feed rate of



P2 mol fract. 0.4 0 0.6 1



mol 20 0 30 50



Answer : Feed rate of methanol =



50



kmol



ogen, 150 mol/min



he molar flow rate of



Answer : flow rate of limiting reactant in the reactor effluent stream =



mol/min



n in product stream.



P mole fract.



mol



Answer : composition of O2 in product =



tor. Calculate the percent excess air.



P mole fract.



mol



Answer : the percent excess air =