ABSTRACT This study aims to design a Methyl Tert-Butyl Ether (MTBE) plant using the Phillips STAR process with the design of the main tool of adsorbation column (AD- 101). MTBE is used as a fuel additive to increase the octane number, reduce pollutant emissions, and improve engine performance. The factory is planned to be located in Bukit Batu District, Bengkalis Regency, Riau, under the n…