Reaction Engineering

Question 1

Material balance for a batch reactor

Answer 1

Rate of Accumulation = - Rate of Loss

Question 2

Rate of disappearance of a reactant

Answer 2

Rate of disappearance = (-rA)Vr

rA - reaction rate

Vr - reactor volume/volume of fluid in reactor

Question 3

Equation for calculating reaction rate

Answer 3

(-rA) =
moles of reactant reacting/
(unit volume)(time)

Question 4

What are the assumptions of a plug flow reactor?

When do they hold?

Answer 4

• At a given position, for any cross-section at right angles to the flow, there is no pressure, temperature, or composition change
• All fluid element have same residence time
• No diffusion from one fluid element to another

Hold when there is good radial mixing