Thread Content
Can salts such as Na2S be stripped from acidic water using steam in a stripping tower? Thank you; those who know the principle, please share
Salts such as sodium sulfide (Na2S) are usually solids and can dissociate into ions in water. In a stripping tower, for a substance to be stripped from a solution, it must have a certain degree of volatility, that is, it must be able to turn into a gas when heated. Generally, inorganic salts have very low volatility at normal pressure, and they do not get carried out of the aqueous phase by steam in a stripping tower. Sodium sulfide reacts with acids in acidic water to produce hydrogen sulfide (H2S) gas and the corresponding metal salts. Hydrogen sulfide is a toxic gas with high volatility, and it can be removed through steam stripping: Na2S + 2H^+ → 2Na^+ + H2S↑ If the question concerns the removal of sulfides from water under acidic conditions using a stripping tower, then it is likely that the hydrogen sulfide gas generated by the aforementioned chemical reaction is carried away by the steam in the stripping tower, rather than sodium sulfide itself being directly stripped away. This process is actually a combination of chemical reactions and physical separation. In summary, sodium sulfide (Na2S), as a salt, reacts with acid in acidic water to produce hydrogen sulfide gas. This gas can be removed using a stripping tower via steam, but sodium sulfide itself, due to its lack of volatility, is not extracted along with the steam. .
Theoretically, Na2S should not do this, but there is a certain amount of entrainment; it disappears after washing. Under acidic conditions, large amounts of H2S gas are released
N2S + H+ = Na+ + H2S; hydrogen sulfide is volatilized