Monoethanolamine (MEA), the regenerative absorbent used in C02 scrubbers aboard nuclear submarines, is now stabilized with a chelating agent, the monosodium salt of , -diethanolglycine (VFS). This inhibitor is not effective against oxidative degradation at 55°C. in the presence of procatalytic metals, particularly copper. Effective stabilization in the presence of copper is given by tetrasodium (ethylenedinitrilo) tetraacetate (EDTA). At 98°C ., with small quantities of typical metal contaminants added, both VFS and EDTA are required for stabilization. The additive combination is ineffective at 138°and 149°C. with limited amounts of oxygen present. Pyrolytic stability of the formulation is adequate at these temperatures. VFS and EDTA are both true antioxidants for MEA in their own right. Their reactivity with peroxides, and their prevention of peroxide formation in oxidized MEA, suggest that their antioxidant activity results from an ability to interrupt an autocatalytic oxidation chain reaction. Less efficient additives did not prevent peroxide formation in MEA.
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