Phase Equilibria in Some Betaine-Benzaldehyde-Water Systems

Abstract

The phase equilibrium diagrams for six betaine-benzaldehyde-water systems have been determined at 25°, with particular reference to those phases in which future oxidation studies are to be carried out. A progressive increase in the amount of benzaldehyde solubilised in aqueous betaine solutions was found on increasing the betaine chain length from 8 to 11 carbon atoms. Further increase in the betaine chain length from 12 to 16 carbon atoms brought about a progressive decrease in benzaldehyde solubility. These results are discussed in the light of the phases separating at these solubility limits.