Ukucoca iSodium Hydrosulfide: Imvelaphi kunye nokuqonda
Kwishishini lepetroleum kunye neekhemikhali, iinkqubo zokucoca ezifana ne-vacuum distillation kunye ne-catalytic cracking zihlala zivelisa iigesi ze-asidi. Ezi gesi ze-asidi ngokubanzi ziquka i-85%–95% ye-hydrogen sulfide (H₂S), i-3%–10% ye-carbon dioxide (CO₂), i-2%–5% yeegesi ze-organic, kunye ne-0.5%–3% yezinye izinto.
Iifektri ezincinci neziphakathi zihlala zinyanga ezi gesi zine-asidi ngokuzifunxa ngesisombululo se-30% sodium hydroxide (NaOH). I-NaOH isabela ne-H₂S ukuze yenze i-sodium hydrosulfide (NaHS). Xa uxinzelelo lwe-NaHS kwisisombululo lufikelela kwi-30%, isisombululo sidlula kwinkqubo yoxinzelelo. Emva kokuphelelwa ngamanzi emzimbeni kunye noxinzelelo, umxholo we-NaHS uyanda uye kwi 70%, kwaye i-NaHS enyibilikisiweyo emva koko inqunyulwa ibe ziiflakes.
Nangona kunjalo, ekubeni iigesi ze-asidi ziqulathe i-CO₂, ukungcola okufana ne-sodium carbonate (Na₂CO₃) kuveliswa ngexesha lonyango, nto leyo enciphisa ubumsulwa bemveliso ye-NaHS.
Ukongeza, xa kusetyenziswa ii-open-drum flakers ukunqumla i-NaHS enyibilikisiweyo, i-NaHS idla ngokuphendula ne-oksijini emoyeni, yenze i-sodium thiosulfate (Na₂S₂O₃), enokuwohloka kwaye kube nzima ukuyigcina. Ukusikwa okuvulekileyo kukwakhupha iigesi ezicaphukisayo, kungcolise imeko-bume yemveliso.