I. Technical Principle
Hydrotalcite desulfurization is a liquid-phase redox technology that uses a hydrotalcite solvent as a catalyst to directly oxidize hydrogen sulfide gas into sulfur.
Chemical Reaction:
★ Absorption Reaction: H2S + 2Fe3+ → 2H+ + S↓ + 2Fe2+
★Regeneration Reaction: 2Fe2+ + 1/2O2 + H2O → 2Fe3+ + 2OH-
★Overall Reaction: H2S + 1/2O2 → S↓ + H2O
Section II: Technical Advantages
This technology features high desulfurization efficiency, rapid oxidation and regeneration, easy recovery of sulfur, and non-polluting desulfurizing agents. The process is simple, operates at room temperature and low pressure without external heat source, has low energy consumption, and offers great operational flexibility, making it suitable for treating gases with any hydrogen sulfide content.
★ Complete with biogas purification and desulfurization in one step, no need for additional dry refining.
★ Skid-mounted equipment, short process flow, compact structure, small land area
★ Investment and operating costs are both lower than traditional wet flue gas desulfurization and bio-desulfurization.
★ By-products include elemental sulfur, with no waste liquid discharge and pollution during the production process.
Application Fields:
Section 3: Process Flow
Hydrogen sulfide-containing acidic gases enter the absorption tower, where they undergo a thorough mixing and reaction with the solution to remove the hydrogen sulfide. The trivalent iron ions in the solution react with hydrogen sulfide to become divalent iron ions.
The solution rich in divalent iron ions is pumped into the oxidation tower, where it reacts with air blown in by the fan. The divalent iron ions in the rich liquid are oxidized into trivalent iron in the lean liquid by oxygen, which is then recirculated in the absorption tower via a lean liquid pump.
The elemental sulfur settles to the bottom of the oxidation tower, and when the sulfur content reaches a certain level, open the valve to feed it into the filter machine for separation of the elemental sulfur.
