Technology of sulfur production without the use of a thermal stage
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Process Description Feedstock - acid gas containing hydrogen sulfide and air are supplied to the catalytic reactor 1 with an internal heat exchanger , cooled by a refrigerant. From the reactor 1 overhead, the reaction products are fed to scrubber 2, where they come into contact first with water suspension of sulfur , then with the circulating part of sulfur . From the scrubber 2 bottom, part of the sulfur is removed from the unit by pump 5, and the other part is sent back to scrubber 2. The desulfurized gas containing residual sulfur vapors is fed into mixer 3, where it comes into contact with the circulating part of the sulfur suspension supplied from separator 4. The resulting water-gas mixture is cooled in refrigerator 7 and separated in separator 4. Off-gas is discharged from the separator 4 overhead, it is sent to the atmosphere through the off-gas disposal unit 8, and a sulfur suspension in water is removed from the bottom using pump 6, the balance part of which is sent to scrubber 2, and the circulating part - to mixer 3.
Process features
Fluidized-bed reactor or isothermal reactor with a fixed catalyst bed with heat removal from the reaction zone
Complete condensation of vapors and mist of sulfur
Technical Specification
Acid gas pressure - from 0.08 to 0.20 MPa
Temperature - from 25 to 45 ºС
Hydrogen sulfide concentration in acid gas: up to 50% (for the reactor with a fluidized catalyst bed), up to 100% (for the reactor with a fixed catalyst bed)
Sulfur recovery 98.4–99.9 %
The quality of sulfur corresponds to GOST 127.1-93
Patents of the Russian Federation No. 2495820, 2501600, 2508247, 2626351, 2740021, 2758897, 2790697, 2795860.