Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The components of "2-propanol and 2-butanol production, distn. residues" are considered to have a low potential to bioaccumulate as the main components di-isopropyl ether, isopropanol, tert. butanol and sec. butanol all do have a log Kow < 3, and di-sec. butylether (DSBE) is metabolised, resulting in 2 molecules of SBA. In mammalian systems SBA is either conjugated and excreted, or fairly rapidly metabolized by alcohol dehydrogenase to methyl ethyl ketone (MEK). For further discussion on bioaccumulation see PBT / vPvB Assessment (CSR, chapter 8).

Furthermore, the substance is collected in chemical manufacturing plants as a distillation residue through closed piping into a central storage tank. From there, the substance is transported via railroad and/or truck tankers to refineries, producing gasoline fuels. Tankers are unloaded in refineries to storage tanks and from there, via closed piping, fed into distillation and blending facilities (oxygenated solvent streams such as "2-propanol and 2-butanol production, distn. residues" do improve motor fuel performance), to finally become part of engine fuels. During the whole production path from collecting the residues, via storage, transport, unloading and blending into fuel/gasoline, no exposure to the aquatic environment occurs and therefore a further investigation of bioaccumulation in aquatic / sediment environment is not required.

Additional information