GT-Claus is a “modified Claus” technology. Sulzer GTC Technology, in alliance with Rameshni and Associates (RATE) and Shandong Sunway, is able to offer highly customized solutions for sulfur recovery across a range of industries and streams recovering sulfur in the 3 – 2,500 Ton/day range.

Process Description

The GT-Claus modified Claus process has a thermal (combustion) section that partially converts H2S to SO2, followed by combustion and catalytic sections that react the H2S and SO2 to recover sulfur. The gas exits the thermal section, enters a waste heat boiler where heat is recovered. Sulfur is then condensed and the unreacted gases are reheated before introduction to a Claus catalyst bed. Following the catalyst bed, the sulfur is again condensed out before repeating the reheat, catalyst bed stages again. Overall sulfur recovery depends on the number of stages, and can reach 98%. Sulzer GTC can customize the configuration of the GT-Claus unit depending on the acid gas concentration, ammonia content, etc.

H2S + 1½ O2 -> SO2 + H2O

2H2S + SO2 -> 3/x Sx + 2H2O

3H2S + 1½ O2 -> 3/x Sx + 3H2O

To improve the overall sulfur recovery above 70%, the sulfur must be condensed after the thermal section and each catalytic section. The process gases are reheated after each condensation step. Sulzer GTC also offers proprietary reheating technology. Heat recovery will improve overall operating economics.

The tail gas can be sent to an incinerator, depending on the overall sulfur recovery efficiency regulation. A variety of tail-gas treating options are available, including caustic treating, hydrogenation followed by a tail-gas amine unit. Liquid sulfur degassing technology, for liquid sulfur also is available.

There are many nuances to the design and operation of a reliable “modified Claus” process. This is driven by the complexity of the combustion and catalytic reactions, the unique properties of sulfur, and the corrosion risk inherent to this system. Sulzer GTC offers design and operations experience that is unique in the industry.

Process Advantages

  • Recoveries from 98.5 to 99.99%
  • Lower operating costs than liquid iron-redox or other non-aqueous sulfur
    recovery processes
  • High purity, saleable sulfur
  • Can destruct ammonia, BTX, cyanide and heavy hydrocarbon