モノラウリルリン酸2ナトリウムの加水分解反応

抄録

Disodium lauryl phosphate was synthesized by pyrophosphoric acid method, and the degree of hydrolysis was measured at various initial concentrations, temperatures, and alkali concentrations. The hydrolyzed product, inorganic phosphate, was determined by colorimetry with ammonium molybdate at 660 mμ, but co-existent alkyl phosphate was observed to give a negative effect on the coloration. By applying a suitable correction, the degree of hydrolysis was obtained. It was found that this hydrolysis reaction was a 2nd order, reversible reaction, and the relation between the degree of hydrolysis (x) and reaction time (t) was represented by the following equation : [numerical formula] where k₁ is the rate constant of hydrolysis reaction, x_∞ is the degree of hydrolysis at equilibrium, c_o is the initial concentration, and CN_aOH is the alkali concentration. The activation energy obtained was 7.48 kcal/mole. It was also concluded that the degree of the hydrolysis would be very low at room temperature.