A sieve tray column is proposed for the regenerator. Numberof stages is estimated via shortcut simulation. This resulted in 18stages, which is consistent with that of Sohbi et al. (2007). The col-umn is at 182.7 kPa with a total pressure drop of 20.7 kPa. Twospecifications need to be specified for regenerator simulation; theseare: (i) bottoms to feed ratio, which is set as 0.943 after some tri-als, and (ii) reboiler duty, which is estimated based on the equationdeveloped by Abdulrahman and Albarzenji (2012).