Aqueous solutions of alkanolamines, such as monoethanolamine and diglycolamine (primary amines) and diethanolamine and
diisopropanolamine (secondary amines) are often used in industrial operations1;2 . It is an established fact
that the basicity is provided by the amino site while the -OH group results in increased solubility in water
for these alkanolamines. All of these amines - as well as the tertiary amines - react with H2 S instantaneously
since it is a proton donor Bronsted acid: