Suitable for both low- and high-pressure gas treatment, the solvent provides superior performance characteristics over MDEA (methyldiethanolamne) solvents in Claus tail gas treating, acid gas enrichment, and acid gas removal applications. When used in a tail gas treating unit in conjunction with a Claus sulfur recovery unit (SRU), the new technology has the capability to achieve greater than 99.99% overall sulfur recovery and very low emissions to cope with future requirements. Commercially demonstrated to show superior performance characteristics over MDEA formulations and even improvements over FLEXSORB™ SE/SE PLUS solvents.