It is commercially extracted by the fractional distillation of liquid air.. 
O ní ikan ninu àwọn odioníná tokerejulọ larin gbogbo awọn àpilẹ̀ṣe ti a mọ, bakanna ohun ni àpilẹ̀ṣe aladanida keji toṣọ̀wọ́njulọ (leyin aṣyinrinne).. 