# Ideal Reactors for a Single Reaction, Conversion and Reactor Sizing

This quiz contains multiple-choice problems on batch reactor design equations, flow reactors design equations, ideal reactors problems, flow reactors, right reactor series, space-time and velocity.

Start Quiz

Find the volume of reactor needed for 70% conversion of A to the product. An aqueous feed of A and B (200L/min, 20mmolA/L, 50mmolB/L) is fed to MFR. Reaction kinetics is as follows:
A + B → P
-rA = 200CACB mol/L-min

12.5

3.6

6.4

1.5

For a constant volume system, the size of the batch reactor is __ PFR.

Smaller than

Larger than

Same as

Cannot be compared

How should two unequal-sized MFRs be connected in series to maximize production for a first-order homogenous reaction?

Smaller MFR followed by larger MFR

Larger MFR followed by smaller MFR

Any arrangement

MFR’s should not be connected in series

For all positive reaction orders and any particular duty, the MFR is always larger than the PFR. True or false?

True

False

A graphical procedure for finding conversion in MFRs of different sizes in series is called __ method.

Newton’s

Wheeler’s

Octave’s

Jones’s

The best arrangement of reactors for a reaction whose rate-concentration curve rises monotonically is

Plug, large MFR, small MFR

Plug, small MFR, large MFR

Large MFR, small MFR, plug

Small MFR, plug, large MFR

Four MFRs operate in series with the total space time being 5 minutes. If a single PFR replaces it, what will be the space time? First-order reaction with rate constant 2 min^(-1), concentration reduces from 50 mol/m^3 to 10 mol/m^3.

0.805

0.123

0. 562

0.439

Space time is defined as

The time required to process unit volume of feed

The time required for the reaction to occur

The time required to produce unit volume of product

The time to process the entire volume of feed entering

Space velocity is the number of unit volumes of feed that can be treated per unit time. True or false?

True

False

An existing MFR must be replaced by one four times larger than it. Find the new conversion if a homogeneous liquid phase reaction with reaction kinetics as follows:
A → R
-rA = kCA2 with 30% conversion

0.67

0.45

0.53

0.92

Replace the existing MFR with a PFR and calculate the new conversion of a homogeneous liquid phase reaction with reaction kinetics as follows:
A → R
-r{A} = kC*A{2} with 30% conversion

0.65

0.43

0.38

0.92

How should a PFR and MFR be connected to maximize production from a first-order reaction?

MFR followed by PFR

PFR followed by MFR

Any arrangement

MFR and PFR should not be connected

The effect of flow type on reactor performance when the conversion is small

Is none

Cannot be determined

Is very small

Is very large

The unit of space velocity is

s

s^(-1)

m^3

m^(-3)

Find the conversion of a 25 L PFR if a gaseous feed of pure A (2 mol/L, 150 mol/min) Is decomposed (kinetics are as follows: A → 2.5R; - r{A} = (15min^(-1))*C{A})

0.89

0.92

0.45

0.68

Quiz/Test Summary
Title: Ideal Reactors for a Single Reaction, Conversion and Reactor Sizing
Questions: 15
Contributed by: