Effect of pressure on the selectivity for the esterification of ethylene glycol with propionic acid in supercritical C[O.sub.2]

A study was conducted to investigate the esterification of ethylene glycol with propionic acid in supercritical C[O.sub.2] at 50 degree Celsius. The solvent power of C[O.sub.2] for the diester is found to be stronger than that for the monoester because C[O.sub.2] is a nonpolar solvent and polarity of the monoester is stronger than that of the diester.