Sodium Hydrosulfide for Mercaptoacetic Acid Making

 sodium hydrosulfideProduction Method: Absorption Process
Absorption Reaction

A sulfide alkali solution (or sodium hydroxide solution) is used to absorb toxic H₂S gas.

Critical safety measure: The reaction must be conducted under negative pressure to prevent H₂S leakage.

Multi-Stage Absorption

To minimize environmental pollution, multiple absorbers are connected in series, ensuring H₂S concentration in tail gas is reduced to safe levels.

Concentration

The absorbed solution is concentrated to yield solid or liquid sodium hydrosulfide NaSH.