SCOT Process

SCOT Process

Figure 10.6 illustrates how the SCOT Process is integrated with the Claus Unit to convert COS, CS₂ and any remaining SO₂ by reacting with H₂ in the catalytic reactor back to H₂S to be recycled to the Claus Unit to close the loop. The hydrogenating catalysts used in SCOT contain nickel or tungsten on alumina support, and the reaction takes place at 480-570°. By coupling Claus and SCOT processes, more than 99% of sulfur entering the Claus unit can be recovered as elemental sulfur to be sold as a refinery product.

Figure 10.6. The Shell Claus Off-gas Treatment (SCOT) process.

Credit: Dr. Semih Eser © Penn State is licensed under CC BY-NC-SA 4.0