Lesson 1 of1
In Progress

Key Principles for Analysis of Reacting Systems

Abdulaziz July 6, 2020

• Mass must be conserved
• Atomic species of a reacting systems cannot
be created or destroyed.
• Balance of momentum must be satisfied
• Balance of thermal energy must be satisfied
• Thermodynamic relations must be satisfied

// Example of Reacting System

Incomplete combustion of ethane

How is the reactor performance dictated by:

  • reactor temperature? (how does T varying within reactor)
  • residence time of reactor?
  • inlet/exit compositions? (how does Ci varying within reactor)
  • laminar vs turbulent flow?
  • use of catalysts? (homogeneous vs hetrogeneous reactions)

// Analysis of Chemical Reactors and the Connecting Disciplines

// Mathematical Models of Chemical Reactors

  • Batch reactor – no mass in or out
  • Continuous stirred tank reactor (CSTR) – completely mixed
  • Plug flow tubular reactor (PFTR)- completely unmixed
    • Batch reactors operate in transient (unsteady) mode
    • CSTR and PFTR may be operated in steady state or transient modes
  • Industrial reactors are combinations of the above