Also known as:
The sulfur plant converts H2S gas into elemental sulfur that can then be sold as a finished product.
The process results in a molten sulfur product that can either be sold directly in liquid form or converted into solid pellets by cooling with water.
The H2S rich gas is fed into a reaction chamber with 1/3 the stochiometric volume of air required to burn it. Burners convert 1/3 of the H2S to SO2, which then reacts with the remaining H2S (in the presence of an alumina catalyst) to form elemental sulfur. The resulting product is cooled to condense to liquid sulfur
The tail gas often contains small amounts of COS and CS2. To remove this, the tail gas is mixed with a small amount of hydrogen and carbon monoxide, heated, and reacted over a catalyst that converts the sulfur to H2S. This process is called the SCOT process. The H2S rich gas can then be sent to the acid gas recovery plant and ultimately gets recycled back into the sulfur plant as feed.