3 replies to this topic

[hoyoku]

Does anybody know whether a CSTR can be design to cater to a residence time of 30 mins? Any CTSR application in history that has a residence time of 30 mins? Pls help if possible. Thanks.

[Doggert]

A CSTR can have any residence time you want it to have between t > 0 and t < infinity.

Residence time in a CSTR is a function of vessel volume (Vr) and volumetric flowrate (Vf):

t (residence time) = Vr / Vf

[hoyoku]

A CSTR can have any residence time you want it to have between t > 0 and t < infinity.

Residence time in a CSTR is a function of vessel volume (Vr) and volumetric flowrate (Vf):

t (residence time) = Vr / Vf

Will a CSTR of residence time 30 mins be reasonable in industry? I mean I understand I have to calculate base on the kinetics of the reaction to size the volume. But base on your experience, can a CSTR of 30 mins residence time have a practical volume? My lecturers asked me to support my choice of using CSTR for my design project. Cos Im proposing to use a CSTR for esterification reaction between lauric acid and methanol, which normally ppl use batch reactors. The reaction time for esterification is around 30 mins. Will appreciate if you could give some good opinions. Thanks.

[davsy]

Will a CSTR of residence time 30 mins be reasonable in industry? I mean I understand I have to calculate base on the kinetics of the reaction to size the volume. But base on your experience, can a CSTR of 30 mins residence time have a practical volume? My lecturers asked me to support my choice of using CSTR for my design project. Cos Im proposing to use a CSTR for esterification reaction between lauric acid and methanol, which normally ppl use batch reactors. The reaction time for esterification is around 30 mins. Will appreciate if you could give some good opinions. Thanks.

hoyoku
As has been mentioned previously a CSTR can have any resinence time within the practicalities of the mechanical construction of the vessel. It really depends upon your plant capacity at your state residence time.

Just a point about your specific application, you are suggesting that for "Esterification of lauric acid people normally use batch reactors" in my experience CSTRs are used in many commercial Methyl Ester plants however you need to look at your reaction as I have not seen many operating at only 30 minutes. I assume from the 30 minutes that you are talking elevated pressure/ temperature reactions.