Business Long-awaited Baton Rouge ExxonMobil plastics plant expansion goes online By Deanna B. Narveson - January 18, 2023 ExxonMobil's refinery in north Baton Rouge. (Tim Mueller) FacebookXLinkedinEmailPrint State and city-parish officials and ExxonMobil leadership are set to celebrate the startup of the company’s long-awaited polypropylene growth project at its north Baton Rouge plant on Thursday. Already an INSIDER? Sign in.