Sweetened Middle Distillate

Sweetened middle distillate (CAS 64741-86-2) is a petroleum refinery fraction produced by treating sulfur compounds in the middle distillate cut via the Merox process. The "sweetening" refers to converting mercaptans to disulfides, improving odor without hydrotreatment. In fuel additive formulations, it serves as a carrier solvent and provides lubricity. The GHS Carcinogenicity Cat 1B classification arises from polycyclic aromatic hydrocarbons present in the petroleum fraction — a standard classification for petroleum middle distillates that have not been fully hydrotreated. The health concern is primarily occupational, from long-term repeated skin contact or vapor inhalation, not from brief consumer use. This ingredient is distinct from hydrotreated middle distillates (CAS 64742-46-7), which have undergone more extensive processing to reduce PAH content.