How to enter the reaction rate constant directly
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I’ve been learning *aspen lately, and I ran into some trouble while working on a practice problem. The module selected is the RPlug in the reactor. The reaction rate constant is given directly in the problem, but when entering the reaction data, it is required to input the pre-exponential factor k and the activation energy E of the reaction. I know that the reaction rate constant can be determined using k and E, but the problem only provides the reaction rate constant without giving k and E. Meanwhile, Aspen requires these values to be entered; there’s no option to enter the reaction rate constant directly... What should I do? It’s stuck here 555555~~~
k = k0 * exp(-E/(RT)); at a constant temperature, k is a constant. It can be assumed that E = 100 kJ/mol, and K0 can then be calculated using k
This post was last edited and replied to by zy19870105 on 2010-12-27 at 20:29. Reply 2# *aohaiyi8080 Haha~~ I calculated it in the same way, by assuming an E value and then deriving the pre-exponential factor; however, I always find this approach strange… After all, the problem also provides the equilibrium constant (it states: “Under the reaction conditions, the reaction rate constant k = 1.68×10^-10 kmol/kg⋅s, and the equilibrium constant Kp = 3.727×10^4 Pa”). Why is the equilibrium constant given? Also, if I want to specify that the final conversion rate for this reaction should be 60%, but I can’t find the corresponding option – where can I enter this conversion rate?
For reactor simulation, it depends on the type: yield-based, thermodynamic, kinetic, or one that considers equilibrium constants. Once the equilibrium constant is known, the reverse reaction rate constant can be calculated; it’s naturally best if a kinetic model can be used
Reply to 4# *aohaiyi8080: I see, thank you! It seems I need to study reaction engineering thoroughly~