3 replies to this topic

[Chem885]

Hey folks,

 

I'm going to undertake sizing for a PFR reactor. The volume of a single PFR necessary for a conversion of 95% is required. I've attached an image which shows what I've done so far. I've used "ADJUST" operator for that. What I don't know is:

 

To set the target variable; what variable should I choose so I can enter 95% conversion?

 

In "Object" section I choose "PRODUCTS" and then I don't know what to choose for variable to suit conversion which is given. There are many variables available !!!

 

Thanks for your help.

 

 uni1.jpg   92.8KB   1 downloads

[thorium90]

Perhaps you can zip up your file and post here? It would be alot easier to comment on it that way.

[Chem885]

The file is created by UNISIM R390. Could you open it then ? 

 

Attached is the file. The question is:

 

What is the volume of a single PFR necessary for a conversion of 95%? Assume isothermal operation at 850 K. (I've applied all conditions such as composition, Temp, Pressure and etc.)

Attached Files

•  PFR.zip   19.15KB   5 downloads

[thorium90]

Im sorry, I only have aspen hysys. I cant see what you put in the Adjusted variable. The heat flow? If you want to have 95% conversion, select the same PFR-100, select Act % cnv for that particular reaction to be 95%. The volume for 95% conversion really depends on many things, so without more information it is impossible to calculate the volume from a percentage conversion.

 

Perhaps you should use a spreadsheet for calculating the volume of your reactor. Simulation tools like unisim and hysys are for simulating stuff, not really for calculating stuff. You have to already know what to put in...

Edited by thorium90, 20 September 2013 - 11:18 PM.