[Woopy]

Hello,

Here is a homework problem that I have been working on. I am wondering if for the mass balance of substance A, do I include the terms in the reaction rate that involve species R and B? Also, wouldn't A and B start reacting in the pipe before they even go into the CSTR? (I guess put in 2 different pipes then!).

Also, I wasn't sure if my mass balance for the PFR is right, I'm pretty sure it isn't. The trouble is I don't know how to put it in terms of volumes when given moles for the PFR, so I just did a volume flow rate (or rather just a velocity I suppose, in terms of z, a length).

[curiouscat]

Can you post as images. I hate to open pdfs to see problems.

[curiouscat]

Link moles n volume by gas law or density.

[Woopy]

My attempt is too large a file to post as a image on here

[curiouscat]

I am wondering if for the mass balance of substance A, do I include the terms in the reaction rate that involve species R and B?

Yes.

Also, wouldn't A and B start reacting in the pipe before they even go into the CSTR? (I guess put in 2 different pipes then!).

If they react so easily you need a pipe-tee not a reactor. Typically a reactor has heat / catalyst / mixing something a pipe wouldn't offer. Or just residence time.

For hyper fast gas reactions a pipe is indeed all you need. Maybe cooling.

[Woopy]

Okay, so what am I missing in my solution? By the way, part C is for a batch stirred tank reactor

[curiouscat]

Okay, so what am I missing in my solution? By the way, part C is for a batch stirred tank reactor

Try reducing image size n posting. Cant read a pdf.

[Woopy]

okay, I have reduced the size

[curiouscat]

First, re your CSTR: why no B in outlet for B-balance?

[curiouscat]

In your A-balance signs seem screwed up for rate expression.

[Woopy]

For the CSTR, I said no B comes out because the reaction went to completion. My A-balance for which part is screwed up? I changed the signs for all of them because it is depletion so I am subtracting

Edit: Or rather, my intent was for all the signs to be opposite of what they are in the problem statement!

[curiouscat]

For the CSTR, I said no B comes out because the reaction went to completion. My A-balance for which part is screwed up? I changed the signs for all of them because it is depletion so I am subtracting

Edit: Or rather, my intent was for all the signs to be opposite of what they are in the problem statement!

Yeah look again. Not all are changed.