Chemical Reaction Engineering studies how reaction rates are affected by temperature, pressure, and reactant concentration. It provides information about reaction mechanisms, speeds, and types that can be used in bioreactor design. Fundamental concepts include reaction rates, rate laws, and rate constants. Reaction rates are defined as changes in molar concentration over time and can be positive for products or negative for reactants. Rate laws relate reaction rates to reactant concentrations and rate constants measure reaction rates when reactants are at unit concentration.

2. Chemical Reaction Engineering is the
study of the rate at which reaction takes place and
effect the parameters such as Temperature, Pressure
and Concentration of reactants.
Chemical reaction engineering gives
the information about the rate of the mechanism,
speed of reaction and type of reaction which can
be used in designing of reactions in bioreactor.

3. FUNDAMENTAL CONCEPTS OF
CHEMICAL REACTION
Reaction rate or Rate of reaction
Rate law or Rate of reaction or Kinetic
law
Rate constant

4. RATE OF REACTION
It is defined as change in
molar concentration of species per unit time
or rate at which change in concentration of
reactants decreases per unit time or increase
in concentration of products per unit time.

5. For Reactants:
Rate = -change in conc. of reactants
time
 -ve sign indicates decrease in concentration of reactants.
For products:
Rate = change in conc. of products
time
 +ve sign indicates increase in concentration of products.

6. UNITS
Rate = change in conc.
time
= mol ∕ lt.sec
= mol.lit-1.sec-1

7. RELATION BETWEEN THE CONCENTRATION OF
REACTANTS AND PRODUCTS OR RATE OF REACTION
WITH TIME:
time
Rateofreaction
time
Changeinconc.
ofreactants
time
Rateofreaction
time
Changeinconc.
ofproducts

8. REPRESENTATION OF GENERAL EQUATION
FOR REACTION
Consider xA+yB mC+nD
The relation between rates
measured with respect to A,B C and D
is
-1 dA=-1 dB=1/m . dC=1/n . dD
x dt dt dt

9. RATE LAW OR RATE EQUATION OR KINETIC LAW
The equation which relates the rate of
reaction and the concentration of reactants in a
reaction is called rate law or rate equation .
Consider an equation:
xA+yB product
Rate α [A]x [B]y
Rate=k[A]x [B]y
This equation is called rate equation where x,y
are powers of the concentration of reactants.
‘k’ is rate constant

10. RATE CONSTANT
Rate constant of a chemical reaction is a measure of
rate of reaction, when all reactants are unit conc.
Rate constant = Rate of reaction
[reactants]n
Rate= Rate concentration
Rate constant depends on temperature
Rate constant α temperature

11. UNITS
Rate constant (k) = Rate of reaction
[reactants]n
k = mol.lit-1.sec-1
[mol]n.[lit]-n
=[mol]1-n.[lit]n-1.sec-1
=[conc.]1-n. sec-1
These two equations are called general nth order
equation.

12. SIGNIFICANCE
The rate constant ‘k’ for a reaction is simply
denotes how fast the reaction occurs if all the reactants
are brought about unit concentration.

13. THANK YOU