SURFACE-TENSION OF BINARY-MIXTURES OF WATER PLUS N-METHYLDIETHANOLAMINE AND TERNARY MIXTURES OF THIS AMINE AND WATER WITH MONOETHANOLAMINE,DIETHANOLAMINE, AND 2-AMINO-2-METHYL-1-PROPANOL FROM 25 TO 50-DEGREES-C

The surface tension of aqueous solutions of, N-methyldiethanolamine an d diethanolamine + N-methyldiethanolamine, monoethanolamine + N-methyl diethanolamine and 2-amino-2-methyl-l-propanol + N-methyldiethdnolamin e was measured at temperatures from 25 degrees C to 50 degrees C. For binary mixtures the concentration range was 0-50 mass % N-methyldietha nolamine, and for the tertiary mixtures the concentration range for ea ch amine was 0-50 mass %. The experimental values were correlated with temperature and mole fraction. The maximum deviation in both cases wa s always less than 0.5%.