CSTR + PFR Arrangements in Series // Reactor Engineering - Class 34

[@CoralCobra784]

Dude you are God sent. Your content is extremely well organized and clear. Thank you for all your hard work we appreciate it big time. Keep saving our lives and midterms haha

[@RahelAHafa-nx2on]

Can you tell us if thre is any general rules regarding rearranging of ractors

[@ChemicalEngineeringGuy]

There are no 100% bulletproof rules, you need to consider: Kinetics, sizing, costs (operation and investment), safety, purity, recovery etc

[@azeem25]

Sir, I'm having problem finding the solved problems on your webpage..It's showing "Reactor Engineering(Coming Soon)"..Please Help me out. Thank You Very Much Sir.

[@caracruzTV]

Hi, do you know how to justify the best order for an specific Van de Vusse reaction? (which as I get from this video is CSTR followed by a PFR)

[@ChemicalEngineeringGuy]

Not quite sure, but if I had to, I'll go for the latest articles or trends in the field or application of my niche

[@caracruzTV]

@@ChemicalEngineeringGuy Can you believe I did it for my exam on my process optimization course and I understood why but today I have totally forgot how to do it? I graduated shortly after that comment and it's been 2.5 years but it is still sad when you think about it

[@tineog1567]

I Emmanuel, I cant seem to access the reactor engineering course on your website, please assist

[@ChemicalEngineeringGuy]

reactor engineering is not yet online! Sorry for the inconvenience!

[@rahulchittoory2388]

can we arrange two cstrs in series and pfr in parallel to them?

[@ChemicalEngineeringGuy]

Sure thing... Actually will increase efficiency most likely

[@carlfrancislacson5223]

Hi, I am little confused where does x3=0.8 (at 10.26) comes from. The video says it is global conversion. Bu I think it is neither computed nor given (x3=0.65) in the problem. I hope you can enlighten me. Thanks

[@onursert5852]

Hi, you write dV at PFR equation(9.14minute). I think you want to write dx. pls check writing PFR equation.

[@ChemicalEngineeringGuy]

Im pretty sure we are using dV, since we are integating for volume

[@YT-yt6zq]

Hi Emmanuel, in the third tank you got X3=0.8, could you confirm it was not suppose to be 0.65

[@YT-yt6zq]

@9.57 (time)

[@ChemicalEngineeringGuy]

Yes Zainab, the OVERALL conversion is 0.80, but the local conversion is 0.65

[@YT-yt6zq]

Chemical Engineering Guy how was this calculated please

[@MultiRebond]

hey Chemical Engineering Guy! thank you so much for the videos and all the effort you put into it!! but can you please explain me how to calculate series of CSTR's with only a single pass conversion (not knowing the global conversion)? I can't seem to find it on your webpage (or can you calculate the global conversion given the single pass conversions? and if so, how do I do this?)

[@ChemicalEngineeringGuy]

+Remon Balzer hey, thanks for commenting; I do have some examples of single pass conversion vs. global pass conversions in series... check the reactor playlist

[@MultiRebond]

+Chemical Engineering Guy what is the name of the video? I can't seem to find it :o

[@omkarkhare9160]

very useful!

[@sanjaykumaryadav3186]

flow rate is in mole/s . the rate is in mol/volume .hr . there must be conversion. and also mole and kmol conversion.

[@ChemicalEngineeringGuy]

Exactly! The assumption is only true when we assume same number of moles in gas phase or similar density in liquid phase with same amount of moles

[@eliezeretecap]

Hey! Does Fogler teach about reactors with recycling? On Levenspiel there is a section where it talks about CSTR+PFR in series, with a recycle added on the PFR.

[@ChemicalEngineeringGuy]

Yes, you can checkout some examples. Only "simple" examples can be worked on by hand due to iterations. Eventually, you will solve them on a software such as Aspen Plus due to amount of calculations! The important thing is to actually know how to set and model the equations.

[@eliezeretecap]

Oh i see. Thanks :D