# What is Cstr: Definition and 15 Discussions

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1. ### Second order reaction, conversion in a CSTR

Homework Statement We have a second order reaction: A + B → C + D with -rA = k[A][ B] [A]0 = [ B]0 = 300 mol / m3; τ = 11 minutes. k = 4.0 × 10-4 m3 / (mol × minutes) What is the conversion in a CSTR?Homework Equations I think: τ = ([A]0 - [A]1) / -rA,1 τ = (XA × [A]0) / -rA,1 But since I...
2. ### Conversion in equal volume CSTR and PFR

Hello I've been working on a problem that involves finding which reaction order gives a greater conversion for a CSTR over a PFR (Xcstr>Xpfr). I was able to solve the mass balance for each reactor, finding: and Allowing us to equate them. This is where I've been stuck for a while now, how...
3. ### I Why is first TD law different for chemical reactors

I've learned that first thermodynamic law for some open system is in the form of: where total change of system energy ##\frac{\partial E}{\partial \tau }## is equal to the transferred heat and work. Total change of system energy ##\frac{\partial E}{\partial \tau }## is equal to the energy...
4. ### Can someone identify what this graph is used for?

Hi, I was asked by my senior to find out what this graph is and how to use it. No details were given as to where they found it. I know already that this is used to compare CSTRs and PFRs performance for first order reactions, but I can't deduce what the expressions Dd/(vxL) and kL/vx are for...
5. ### Sizing a CSTR for transesterification reaction

Hi, I need to size a CSTR for the transesterification of tri-glycerides into methyl esters (bio-diesel) by reaction with methanol and NaOH catalyst. The transesterification reaction taken place in 3 reversible steps: TG + CH3OH <--> DG + ME DG + CH3OH <--> MG + ME MG + CH3OH <--> C3H8O3 + ME...
6. ### PFR with axial dispersion - CSTR in series conversion?

Homework Statement Here is the problem description: Develop an Excel file that given a set of data from an RTD pulse injection will determine the model parameters of the following schematics, and then predict the conversion in a CONTINUOUS reactor with a n-order reaction (where n is not equal...
7. ### CSTR Pressure Relief Valve: Liquid Phase Reactions

There is a liquid phase homogeneous reaction going on in an CSTR, which operates at 4 atm. Is it necessary to have pressure relief valve? If so, what will be vent out when the pressure exceeds, since it contains liquid only?
8. ### How Do I Calculate the Height and Diameter of My CSTR Reactor?

I have obtained the volume of my CSTR, how do I calculate the height and diameter of it? Is there a certain ratio to adhere to for better mixing? Tried reading up the rules of thumbs but no info on that. Tried searching other books too but to no avail.
9. ### How to maintain commercial scale CSTR temperature?

I'm currently doing a design for my final year studies and it's regarding esterification process. My proposed reactor is CSTR, operating at a temperature of 60C and 400 kPa. Reactants are methanol and jatropha oil with sulphuric acid catalyst. For a commercial scale production of biodiesel...
10. ### Using Levenspiel Plots to Figure Out CSTR Volume

Hello, I am having some difficulty with levenspiel plots, in particular when dealing with a CSTR and when the reaction rate is increasing with conversion. I will give an example plot to demonstrate my point. Assume we are trying to find the volume of a CSTR necessary to reach a conversion of...
11. ### PFR vs. CSTR reactor size for various order reactions

Hello, I have been working on a very interesting problem out of Fogler's Chemical Reaction Engineering. I have completed the problem (parts (a) through (c) which is what i'll do because I've been working on this problem for a while and I'm too tired to do part (d) right now), but I want to...
12. ### Concentration change in CSTR

Hello, Suppose A and B are continuously added into a tank, and exit stream consists of A,B,C, and D. I am a little confused on the following point as I follow the example in my textbook. The reaction is ##A + B → C + D## It says because (and I quote) ''...Because the system is operated at...
13. M

### CSTR vs. BSTR system open or closed

Hello, I was wondering, is it the case that a CSTR is an open system because there is flow passing in and out of the tank, thus passing the control volume, so it's open. Similarly for a BSTR, the fact that there is no flow means that it is closed? I mean in that sense, a beaker with a...