Unformatted text preview: ~ ~r~~r~~~€HBE~46t CHEMICALAREACTTON ENGIN’EERiNGW MW, e “we ~e~ , - ASSIGNMENT I
Tuesday, 25/1/2011 Please hané‘m 0%)? #1 0W1“? zﬁéZ- 1. Consider the equilibrium between solid FeS and H28, H2 and 82. Sulphur dissolves in FeS to
form a binary solid solution that consists only of FeS and 82. Equilibrium is established at 1000K and 1 atm pressure. The gas phase consists of hydrogen
sulphide, sulphur and hydrogen. The solid is analyzed, and the mole fraction of F eS (Xpes) is
found to be 0.94 What is the composition of the gas phase? Do you sufficient information to calculate the initial ratio of FeS to HZS?
The gas phase reaction is 2st =: 2H2 + 32 K1000K :5.012x10‘5
The equilibrium fugacity of sulfur in FeS is given by the following equation: Y2.
L003 £32 2 (70.03 ~— 8383 KF‘SXLQQQJ) ._ 39.30 (1—— Chasixpcs‘) ,‘ up“
Q5 _ Nags +N52‘
2. Determine a set of independent storchiometric relationships for the system [(CzHﬁ, CH4, H2, C2H4, Csz) (C, Hll Assume that initially the system consists only of ethane and that the reactions occur only in the
gas phase. The reaction mixture at equilibrium consists only of the components above.
Calculate the composition of the equilibrium mixture at pressure of 1 atm and at 1000K using
both the equilibrium constant and free energy minimization methods. Please specify the source
of the thermodynamic data you use to solve the problem. , l 3. Consider the reaction A(g) + B(g) —-—> C(g) + D(g,s)
Compound D precipitates when its partial pressure exceeds 10 kPa. The reaction is to be carried
out in a continuous tubular ﬂow reactor. The feed consists of A and B at the stoichiometric ratio
(1.6. FAf : F131“).
a) What should be the minimum (or maximum) operating pressure in order to prevent the
precipitation of D if A is to be completely converted?
b) Suppose that we are interested in producing solid D. What should be the operating pressure if only 10% ofthe total D that is produced is in the gas phase? (Assume complete conversion of
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- Winter '11