(169a) Tutorial: Light Naphtha Isomerization

The objectives of light naphtha isomerization have traditionally been to increase the octane of light naphtha streams and to manage benzene. These objectives are still relevant today as refiners search for new sources of octane to offset octane losses from MTBE phase-out or gasoline desulfurization and as refiners look for economical ways to comply with the MSAT II limits on gasoline benzene. Light naphtha isomerization processes have been an effective solution for these objectives for more than forty years. New catalysts and new process technologies are making light naphtha isomerization technology more economical and more effective for meeting the challenges of today's refinery.

This tutorial will review the fundamental thermodynamics and process concepts for light naphtha isomerization. It will then review and compare the common catalysts and process configurations. The tutorial will focus on the importance of light naphtha isomerization as part of a refiner's MSAT II compliance strategy and on the comparative economics of various processes for both new units and unit revamps.