Chemical Engineering - Chemical Reaction Engineering - Discussion

This auto-thermal reactor consists of two concentric tubes. The feed enters an annular region between the tubes at temperature and flows from right to left. The reactants are at temperature when they enter the inner tube, which is a packed catalyst bed, where they flow left to right. An exothermic reaction in the catalyst bed raises the gas temperature and heat transfers from the catalyst bed to preheat the gas in the annular region.

In CSTR, transfer of energy is possible by the jacket and hence it is used for carrying out an auto-thermal reaction.