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Some latest employment surveys show that chemical engineers are working in more and more diverse industries manufacturing specialty and commodity products; they need to understand property-structure relationships using chemistry, biology, and physics. Therefore, modular teaching with open ended design projects can provide a means of responding to d...
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... ammonia process is simulated by the Aspen Plus simulator with RK-SOAVE equation of state property method. The ammonia plant uses 9071.5 kg/hr hydrogen and 42.48.3 kg/hr nitrogen, and produces 50111.1 kg/hr 99.9 wt % anhydrous ammonia. The plant operates for 8520 hours per year. Air is separated in SEP 101, and the feeds of nitrogen and hydrogen at 20.27 bar are mixed in M101. This mixture is compressed to about 212 bar in compressors C101 and C102. In reactor R201 the ammonia synthesis 3H 2 + N 2 → 2NH 3 takes place at around 556 o C and 212 bar with a platinum group metal such as ruthenium. The reactor R201 is a RGIBBS reactor and estimates the equilibrium composition of the reactor by Gibbs free energy minimization. The output of the reactor is conditioned in heat exchangers E202 and E203 and sent to adiabatic flash drums FL301 and FL302, which operate at 203 atm and at 12 bar, respectively. The bottom flow of FL302 is the product ammonia at -26 o C and 12.4 bar. Figure 3 shows the conceptual PFD for the ammonia plant with major equipments. The ammonia plant requires electricity, cooling water, steam, and refrigeration as utilities. The flow rate of ammonia is maximized to be 2942.7 kmol/hr and its composition to be 0.99-wt% within the optimization block with ...
