2 replies to this topic

[trituty1989]

Hi,

 

I am currently tasked to take charge of a reactor section of a simulation design project to produce Vinyl Acetate Monomer (VAM). The simulation software utilized is ASPEN Hysys v.8.6.

 

Problem: Using a PFR and heterogeneous catalysis type reaction, i input the complex kinetics given in a literature. However, since the rate units in the paper was given as mol/min-g, i multiplied the density of particle to obtain hysys units of mol/min-cm^3. Does this make sense if i did not multiply in the fraction of catalyst in the tube (1-void fraction)?

 

example: void fraction used is 0.8 therefore catalyst fracion is 0.2. Rate units (mol/g-min) multiply by 1.935g/cm^3 catalyst density multiply by 0.2.

 

If lets say i change the void fraction in the parameters page of the reactor, will the kinetics also change accordingly? O

 

 

[_Chemist_]

I think it is not needed to multiply void fraction with your kinetic data. I think Aspen alreadly calculate void fraction automatically,when you change kinetics. But you should multiply your kinetic data with density value to get proper unit for aspen.  

Edited by Hsnbrg, 19 March 2016 - 05:54 PM.

[trituty1989]

I think it is not needed to multiply void fraction with your kinetic data. I think Aspen alreadly calculate void fraction automatically,when you change kinetics. But you should multiply your kinetic data with density value to get proper unit for aspen.  

 

Got it! Thanks!