I-Air Separation Unit (ASU) iyidivayisi esebenzisa umoya njenge-feedstock, iwucindezela futhi iwupholise kakhulu kumazinga okushisa e-cryogenic, ngaphambi kokuhlukanisa umoya-mpilo, i-nitrogen, i-argon, noma eminye imikhiqizo yoketshezi emoyeni owuketshezi ngokulungiswa. Ngokuya ngezidingo zomsebenzisi, imikhiqizo ye-ASU ingaba munye (isb, i-nitrogen) noma eminingi (isb, i-nitrogen, i-oxygen, i-argon). Uhlelo lungakhiqiza imikhiqizo ewuketshezi noma yegesi ukuze ihlangabezane nezidingo ezahlukene zamakhasimende.