Abstract
The rapid determination of sodium hydroxylalkanesulfonate in α-olefin sulfonate (AOS) was investigated by means of NMR spectroscopy; this led to a convenient method for routine analysis of AOS.
From comparison of NMR spectrum of sodium C16-3-hydroxylalkanesulfonate with that of sodium C11-2-alkenesulfonate, any specific signal easily accessible for the determination could not be found. Therefore, in order to eliminate the influence of double bond, the hydrogenation of sodium C11-2-alkenesulfonate was carried out with the ordinary manner using Pd/C catalyst. NMR spectrum of the hydrogenated product turned out to have a very simple pattern(See Fig. 2) in which only one signal based on CH2-SO3 proton appeared in the 2.44.0 ppm region. Authors found that sodium hydroxylalkanesulfonate in AOS was able to be determined by using the signals of CH2-SO3 at 2.73.1 ppm and CH-O at 3.43.7 ppm.
By using this method, sodium C16-3-hydroxylalkanesulfonate in mixtures of sodium C16-3-hydroxylalkanesulfonate and sodium C11-2-alkenesulfonate was determined accurately and rapidly over a wide range (6.390.2 mol%).
