7 replies to this topic

[mubarakahmad]

why MFR has high heat capacity???

Why MFR Is Used For Exothermic Reactions And Pfr For Endothermic Reactions???

when Cp/(delta H) is small , MFR is used and for large Cp/(delta H) PFR is used. why???

when rate decreases progressly with conversion PFR is used and for autocatalytic reactions MFR is used. why???

guys i really need help about these questions. i would appreciate even a little help.

[thorium90]

Where did you get the idea that "MFR Is Used For Exothermic Reactions And Pfr For Endothermic Reactions"? There isnt any restrictions of any sort on what class of reactors to use. Anyway, in reality, MFR, PFR, all these are very general classes, not all reactors are such textbook problems.

Edited by thorium90, 05 March 2013 - 09:28 AM.

[Art Montemayor]

For the sake of all members who can't read your thoughts or intentions and don't care to look up the meaning of undefined acronyms, why don't you simple state what your acronyms mean?

 

That would be much simpler and in line with what engineers are supposed to be trained to do: communicate correctly and accurately.   It would enable all members reading the query to respond accurately and not have to guess or speculate.

[mubarakahmad]

i read all this in chemical reaction engineering book chapter 9 by levenspell.

but i was not able to understand the concept.

CSTR stands for continuous stirred tank reactor

PFR stands for plug flow reactor

MFR stands for mixed flow reactor 

[Allan Hugo]

To learn more about these reactors, I suggest you take a look and engage yourself in several interactive modules from the website of Fogler:

 

http://www.engin.umi...ules/frames.htm

 

Start with the DOS interactive modules like that in kinetic challenge, etc.

This is a companion to a book by Fogler on Elements of Chemical Reaction Engineering.

 

[Raj Mehta]

Yes fogler is a good book. 

 

Also there are few good universities providing chemical engineering courses online as a free course (video's or pdf or both), check out the following links, may be it will be helpful. 

 

http://ocw.mit.edu/c...-2007/index.htm

 

http://www.learnerst...tv525-Page1.htm

 

http://www.engin.umich.edu/~cre/344/

 

http://nptel.iitm.ac...rses/103108097/

 

NOTE: I personally haven't checked each link. Kindly do that.

 

Thanks.

[Art Montemayor]

Raj:

 

Thank you for sharing all the listed, available free Chemical Engineering learnings and information for our members.   The quality and importance of this content cannot be overstressed.  Everyone - especially students - of our members should take the time and make an effort to review this available material.

 

The courses given by NPTEL (National Program on Technology Enhanced Learning) are particularly very well presented and offer the basic and necessary learnings that can easily resolve the majority of some of the queries that often appear in our Student Forum.  The Indian government deserves all the recognition it can receive for this service to its populace and sharing it with all the rest of the world.  I wish our US government would spend some of its wasted entitlement monies on such programs that uplift and improve the level of learning in the country.

[Raj Mehta]

You are welcome Art and i agree with your views about NPTEL. I personally have watched and learned a lot from those videos and as mentioned by you, it would be really great to see if such more and more such free course ware are available from different parts of the world covering various chemical engineering subjects. It would be really a good learning tool for student across the globe. 

 

Thanks.