Absorption of sulfur dioxide and nitric oxide by some amines and N-cyclohexyl-2-pyrrolidone

In searching for solvents that are able to absorb sulfur dioxide and nitric oxide, solvents triethylenetetramine, diethylenetriamine, N-cyclohexyl-2-pyrrolidone and N, N, N', N'-tetraethylethylenediamine have all been tested. It was found that triethylenetetramine and N, N, N', N'-tetraethylethylenediamine absorb nitric oxide, while this gas is not absorbed by N-cyclohexyl-2-pyrrolidone and diethylenetriamine. Sulfur dioxide, besides being absorbed by triethylenetetramine, is also absorbed by diethylenetriamine and N-cyclohexyl-2-pyrrolidone. The Henry's law constants and activity coefficients at infinite dilution of the gases in the absorbing solvents were determined by gas-liquid chromatography. La recherche de solvants capables d'absorber l'anhydride sulfureux et l'oxyde nitrique, nous a amene a tester les solvants triethylenetetramine, diethylenetriamine, N-cyclohexyl-2-pyrrolidone et N, N, N', N'-tetraethylethylenediamine. On a trouve que la triethylenetetramine et la N, N, N', N'-tetraethylehylenediamine absorbent l'oxyde nitrique qui n'est par ailleurs pas absorbe par la N-cyclohexyl-2-pyrrolidone ni la diethylenetriamine. L'anhydride sulfureux, en plus d'etre absorbe par la triethylenetetramine, est egalement absorbe par la diethylenetriamine et la N-cyclohexyl-2-pyrrolidone. Les constantes de la loi de Henry et les coefficients d'activite a dilution infinie des gaz dans les solvants utilisables, ont ete determinees par chromatographic gaz-liquide.