Sodium Hydrosulfide Flake

Production Process of Sodium Hydrosulfide Flake– Absorption Method

Sodium hydrosulfide Flake is produced by absorbing hydrogen sulfide (H₂S) gas into a sodium sulfide solution (or sodium hydroxide solution). Since hydrogen sulfide is toxic, the absorption reaction must be conducted under negative pressure.

To prevent excessive H₂S in the exhaust gas from polluting the air, multiple absorbers are connected in series during production, allowing repeated absorption until the H₂S content is reduced to a low level. The resulting absorption solution is then concentrated to yield sodium hydrosulfide.

The chemical reactions involved are as follows:

With Sodium Hydroxide:
H₂S + NaOH → NaHS + H₂O

With Sodium Sulfide:
H₂S + Na₂S → 2NaHS

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