Umsebenzi ophambili kunye neempawu zesakhiwo:
Amacandelo aphambili esicatshulwa yi-CH₂Cl₂, ioli emhlophe kunye nokulandelela amanzi. ukuthatha inzuzo yamanqaku ahlukeneyo abilayo ezinto ezintathu, isicatshulwa senziwe ngokulandelelana ngokusebenzisa uchungechunge lwamanyathelo, njenge-distillation yokuqala, i-atmospheric distillation, i-vacuum gas extraction, i-CH₂Cl₂ kunye nokuhluzwa kweoli emhlophe. isisombululo sokutsalwa sahlukaniswa kwaye sahlanjululwa ukuze kubuyiselwe i-CH₂Cl₂ (ubunyulu> 99.97%) kunye neoli emhlophe (ubunyulu> 99.97%) ukuhlangabezana neemfuno zokusetyenziswa kwakhona kumgca wokuvelisa kunye nokunciphisa ukusetyenziswa kwezinto eziphathekayo kwenkqubo yokuvelisa. Ukunciphisa iindleko zokuvelisa ifilimu yokwahlula.