INVESTIGATION OF SOME NEW AMINES AS REGENERATIVE CARBON DIOXIDE ABSORBENTS.
NAVAL RESEARCH LAB WASHINGTON D C
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Three amines-monoethanolamine MEA, 2-2-aminoethoxyethanol DGA, and 3-amino-1-propanol MPA-each mixed with one of a series of organic liquids with high CO2 solubility and varying proportions of H2O, were compared with their corresponding aqueous solutions with regard to CO2 absorption, CO2 stripping, and solution viscosity. The organic liquids were N,N-dimethylformamide, N,N-dimethyl-acetamide, tetramethylene sulfone, N-methyl-2-pyrrolidinone, hexamethylphosphoric triamide, and tetramethylurea. While some of the organic liquids improved the CO2 absorption and stripping properties of 4N aqueous MEA to a greater extent than did tetramethylene sulfone, the latter solvent, which has better physical properties for use in submarines, increased the efficiency of 4N MEA about 20, and when admixed with 5N MPA, the improvement was approximately 36. An omega-aminoalkyl alkyl sulfone, 3-methylsulfonylpropylamine, CH3SO2CH2CH2-CH2NH2, was synethesized and compared with MEA with respect to absorption and stripping efficiency, viscosity, oxidation, resistance, foaming, and capacity. A significant improvement over MEA was noted in oxidation resistance, volatility, and stripping efficiency. Although the foaming was excessive, it could be controlled by the use of antifoam agents. Author
- Industrial Chemistry and Chemical Processing
- Life Support Systems