Used 9,000 TPD ISAL (Heavy FCC Gasoline Desulphurization) Unit built in 2005. The ISAL process is a two-reactor, selective hydrotreating process for treating a wide range of naphtha feedstocks. The process uses a bifunctional catalyst system to desulfurize FCC gasoline and to achieve a controlled transformation of the gasoline hydrocarbons. When treating FCC gasoline, the ISAL process reduces the sulfur content to very low levels, saturates almost all of the olefins and restore the octanes through the specific hydro conversion reactions (hydrocracking, isomerization, de alkylation). ISAL catalyst is specially formulated for the selective hydrocracking of the low octane cuts in gasoline to allow in the end regaining the octanes. This is the major advantage of ISAL process vs. a conventional FCC naphtha hydrotreater, where considerable octane loss occurs with olefin saturation. The operating conditions and process equipment used in the ISAL process are similar to those used in a conventional naphtha hydrotreater. Thus, no special operating procedures are required.