Continuous system with microwave irradiation to obtain alkyl benzoates.
In this study, a continuous linear alcohol derivatization is developed. Reaction of alcohol group (ROH) with benzoyl chloride (BC) is carried out in an on-line system with UV detection. All reaction conditions, as flow rate (FR), ROH/BC molar ratio, wavelength, temperature, microwave (MW) irradiation and reaction coil size (internal diameter and length) were optimized. 0.5mLmin(-1), 2.49 [BC]/[ROH], 230nm, 60 degrees C or medium power (225W) when MW irradiation was used and a reactor coil of 159muL (0.5mmx810mm) were the optimum conditions. The on-line system with microwave irradiation was more efficient than the one with a water bath heating. The developed system reduces analysis time consumption, reagent amounts and this system was used to evaluate the composition of commercial samples of alcohols polyethoxylated (surfactants).
Cáceres
Ana
A
Laboratorio de Petroquímica y Surfactantes, Departamento de Química, Facultad de Ciencias, La Universidad del Zulia, Maracaibo, P.O. Box Apartado Postal #15840, C.A. 4005 Zulia, Venezuela.
Jaimes
María
M
Chávez
Gerson
G
Bravo
Bélgica
B
Ysambertt
Fredy
F
Márquez
Nelson
N