Diesel is a middle distillate product obtained from the processing of crude oil in an oil refinery. Diesel is closely related in composition to Heating Oil, with the former differing by its lower sulphur content. The boiling point and density of diesel is higher than that for gasoline.
Dimethyl Terephthalate (DMT)
Dimethyl terephthalate (DMT) is an intermediate in the production of PET. DMT, an ester of terephthalic acid and methanol, was the main route for the terephthalic acid required for polyester production, but has now been largely superceded by PTA (purified terephthalic acid). DMT is classed as a polyester intermediate, as its main application is PET production. DMT production is now restricted to Europe, North America, East Asia and India. All plants oxidise para-xylene into crude terephthalic acid, which is then esterified with methanol.