Studies of Submarine Carbon Dioxide Scrubber Operation: Effect of an Additive Package for the Stabilization of Monoethanolamine Solutions
NAVAL RESEARCH LAB WASHINGTON DC
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Limited sea trials of a monosodium diethanol glycine-tetrasodium ethylenediaminetetraacetate VFS-EDTA additive package to stabilize monoethanolamine MEA scrubber solutions were conducted aboard the USS ANDREW JACKSON and the USS JOHN C CALHOUN. For the one case where a direct comparison could be made, the additive package provided a 100-hour induction period before the formation of nonbasic nitrogen-containing compounds but no induction period was provided by VFS alone. VFS contents of the solutions decreased rapidly with time, but EDTA levels remained essentially unchanged. The large copper contents of used scrubber solutions demonstrated the need for a deactivator such as EDTA. Iron contents were also substantial, but this metal is not considered as potent a degradative procatalyst as is copper. Base stock MEA contained substantial proportions of copper and iron makeup water samples contained no iron and little copper. MEA normalities were generally within acceptable limits, and in the one CALHOUN scrubber examined, up to 50 of the CO2 in the rich MEA was removed in the stripper. Recommendations are made to specify use of the VFS-EDTA package in scrubber solutions, and to take appropriate steps to minimize contamination of these solutions by copper.
- Submarine Engineering