胶束催化对硝基苯酚乙酸酯碱性水解的动力学研究

Studies on kinetics of alkaline hydrolysis of PNPA catalyzed by micelles

The alkaline hydrolysis of 4-Nitrophenyl acetate was studied at 30℃±0.1℃ in the micellar solutions of three surfactants(Brij35,CTAB and SDS).Based on the psedrophase model of micellar catalysis of Menger and Portnoy,the kinetic equations of micellar catalysis were derived.The results indicated that CTAB micellar system effectively catalyzed the hydrolysis of carboxylic ester,compared with Brij35 and SDS micallar systems under the same reaction conditions.Kψ and km of PNPA hydrolysis increase with the rising in the concentration of NaOH reaction system.Furthermore,the chemical kinetic parameters k1m and k2m in the micellar psedrophase and association constant reactant with micellar KS were calculated with the kinetic equations of micellar catalysis.

The alkaline hydrolysis of 4-Nitrophenyl acetate was studied at 30℃ ± 0. 1 ℃ in the micellar solutions of three surfactants （ Brij35 , CTAB and SDS ）. Based on the psedrophase model of micellar catalysis of Menger and Portnoy, the kinetic equations of micellar catalysis were derived. The results indicated that CTAB micellar system effectively catalyzed the hydrolysis of carboxylic ester, compared with Brij35 and SDS micallar systems under the same reaction conditions. Kφ and km of PNPA hydrolysis increase with the rising in the concentration of NaOH reaction system. Furthermore, the chemical kinetic parameters k1m and k2m in the micellar psedrophase and association constant reactant with micellar Ks were calculated with the kinetic equations of micellar catalysis.