I have some experimental data of a plug reactor that packed with random solid catalyst, that intra particle diffusion resistance of catalyst particles for their large size cannot be negligible. Also I have some experimental data of same reactor packed with random fine catalyst particles and monolithic structure catalyst.
When I apply a rigorous kinetic model in aspen plus for that reaction, I face with this matter that aspen plug simulation result have better fitness with experimental data of reactor that contains fine particles and monolithic structure, and haven’t good fitness with experimental data of reactor containing large size particle catalyst.
I think that modeling method of plug reactor in aspen plus, don’t include intra particle diffusion resistance of catalysts. Because the diffusion resistance in monolithic and fine particle catalyst is very small. Have anyone other opinion for this matter?
By considering that my project is focused on simulation of industrial reactor for a process that has large size catalyst particles that their resistance diffusion isn’t negligible, how I can set good and enough match between experimental data of industrial reactor and simulation result in aspen plus?
Rplug was designed for commercial reactors with high mass velocity/Reynolds number and good catalyst contacting. Catalyst contacting is a more important factor for lab scale reactors. You will need to adjust reaction rate constants to account for the differences in effectiveness factors between each cases.
Too little data to provide a reliable answer. How many linearly independent reactions. Isothermal, adiabatic or non-isothermal process? Isothermal grain or not? What flow rate? What temperature? What heat of reaction? Is it possible catalyst deactivation? etc. Usually, internal mass transport and external energy transport should be considered (a two-point boundary value problem for ordinary differential equations.) Or, as Rick Manner proposes, a correction factor (average effictiveness factor) can be used. Regards,
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