Is MFR and CSTR same?
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Is MFR and CSTR same?
The continuous stirred-tank reactor (CSTR), also known as vat- or backmix reactor, mixed flow reactor (MFR), or a continuous-flow stirred-tank reactor (CFSTR), is a common model for a chemical reactor in chemical engineering and environmental engineering.
Which industry uses CSTR?
CSTRs are most commonly used in industrial processing, primarily in homogeneous liquid-phase flow reactions where constant agitation is required. However, they are also used in the pharmaceutical industry and for biological processes, such as cell cultures and fermenters.
What is a CSTR used for?
A continuous stirred tank reactor (CSTR) is a batch reactor equipped with an impeller or other mixing device to provide efficient mixing. In chemical engineering the name CSTR is often used to refer to an idealised agitated tank reactor used to model operation variables required to attain a specified output.
Which reactor is best for high conversion?
PFR is one of the ideal reactors which provides higher conversion. In an ideal PFR, there is no mixing along the axial length although there would be lateral mixing of the reactants along the radial direction.
What is the main characteristics of CSTR?
| Type of Reactor | Characteristics |
|---|---|
| Continuously Stirred Tank Reactor (CSTR) | Run at steady state with continuous flow of reactants and products; the feed assumes a uniform composition throughout the reactor, exit stream has the same composition as in the tank |
Why is CSTR good?
CSTRs are more energy efficient than batch reactors. This is because the reaction is continuous and there isn’t the need to go through empty-fill and heat up cycles.
Why we use CSTR instead of PFR?
To achieve the desired conversion with smaller reactor volumes, use a combination. In this case, use a CSTR then a PFR. By doing so, the reactor volume is less than the area underneath the curve.
Why is a PFR more efficient than CSTR?
As can be seen from the figure, the ratio is always positive, indicating that to achieve the same fractional conversion, the volume of a CSTR must be larger than the volume of a PFR. At high fractional conversion values, the volume required for a CSTR increases rapidly compared the the volume of a PFR.
Is CSTR better than PFR?
A PFR has a higher theoretical efficiency than a CSTR of the same volume. That is, given the same space-time (or residence time), a reaction will proceed to a higher percentage completion in a PFR than in a CSTR.
What is steady state in CSTR?
Multiple Steady States in CSTR with Heat Exchange Solutions can be stable, unstable, or exhibit sustained oscillations or limit cycles. The steady-state operating conditions depend on how the reactor starts up (initial conditions).
What are the limitations of CSTR?
| Kinds of Phases Present | Usage | Disadvantages |
|---|---|---|
| 1. Liquid phase 2. Gas-liquid rxns 3. Solid-liquid rxns | 1. When agitation is required 2. Series configurations for different concentration streams | 1. Lowest conversion per unit volume 2. By-passing and channeling possible with poor agitation |
Which is better CSTR in series or parallel?
The CSTR is always operating a the lowest concentration, the exit concentration. When say two CSTRs are in series, the first operates at a higher concentration, therefore the rate is greater, therefore the conversion is greater.
When would you choose a design with a PFR over a CSTR?
At high fractional conversion values, the volume required for a CSTR increases rapidly compared the the volume of a PFR. If reactor volume is the only criterion for deciding the type of reactor to use, clearly PFRs are the optimal choice.
