The Sulfinol process is a regenerative process that removes H2S, CO2, COS and mercaptans from gases. The sulfur compounds in the product gas are removed to low ppm levels. This process is specifically for treating large quantities of gas, such as natural gas, which are available at elevated pressures.
The Sulfinol process is unique in the class of absorption processes because it uses a mixture of solvents, which allows it to behave as both a chemical and a physical absorption process. The solvent is composed of Sulfolane, DIPA or MDEA and water. The acid gas loading of the Sulfinol solvent is higher, and the energy required for its regeneration is lower, than those of purely chemical solvents.
At the same time, it has the advantage over purely physical solvents because severe product specifications can be met more easily, and co-absorption of hydrocarbons is relatively low. The Sulfinol-M process is used for selective absorption of H2S, COS and mercaptans, while co-absorbing only part of the CO2. Deep removal of CO2 in LNG plants is another application. Integration of gas treating with the SCOT solvent system is also an option. Read more about this technology.