U.S. supermajor ExxonMobil plans to permanently shut down one of two steam crackers at its huge Singaporean refining and petrochemical complex, Reuters reported on Thursday, citing anonymous sources with knowledge of the plans. Exxon owns and operates a 592,000-barrel-per-day (bpd) refinery in Jurong, which is fully integrated with the Singapore Chemical Plant (SCP). The petrochemical complex was first commissioned in 2001 and was further expanded to more than double its capacity in 2013. The chemical plant has an ethylene production capacity…