HydroThane STP ^® CSP: Chemical DeSulphurization Process, this application uses the principle of transferring gaseous hydrogen sulphide to the water phase.

H₂S (g) ↔ H₂S (l)

Followed by the reaction of dissolved hydrogen sulphide with hydroxide caustic:

H₂S (l) + OH^– ↔ HS^– + H₂O
HS^– + OH^– ↔ S^2- + H₂O

HydroThane STP ^® CSP can be designed as a single stage (with/without pre-scrubber) and double (multi) stage scrubber.

Due to the pre-scrubber, the pH in the main scrubber can be lower than in the normal single systems, what results in less CO₂ consumption due to lower pH in main scrubber, less precipitation of solid salts and thus less chance of clogging and simple operation and maintenance.

The HydroThane STP ^® CSP process has the following characteristics:

• Low consumable usage
• Standardized skid mounted unit
• Compact and robust construction
• Low capital investment
• Option for integrated gas drying and conditioning unit