Shimi Baft Petrochemical Company was first established in 1373. It started its official activity in 1378 to produce MTBE strategic product. It was then put into operation in 1381 as the second producer of this product in the country, with a capacity of 45,000 tons. The second unit was produced with the same capacity in 1385. The input feed to this complex includes four-carbon cut (raffinate I) and methanol, and its products include methyl tert-butyl ether (MTBE) as the main product and four-carbon cut (raffinate II) as a side product. MTBE, as a substance that increases the octane number of gasoline and has the advantage of making the combustion of gasoline more complete, plays an important role in significantly reducing emissions from vehicles. Site 2 of this company (former Shimi Tex Aria, which was merged into Shimi Baft in 2018) is also located at Site 2 of Bandar Mahshahr Petrochemical Special Economic Zone. This site started working in 1392 as the first and only producer of methyl ethyl ketone (MEK) in Iran and the Middle East with a nominal capacity of 5,000 tons per year. As an important commercial industrial solvent, MEK is widely used in motor base oil production refineries, paint and resin industries, printing and synthetic leather. The intermediate product of site two of this company is 2-butanol (SBA) and its side product is raffinate III and heavy alcohol.