| Summary: | 碩士 === 國立成功大學 === 化學工程研究所 === 82 === Supercritical fluid extraction has been received wide
attraction during the past few years for potential
application in the specialty-chemicals,food processing,
pharmaceutical, and petroleum industrities.A semiflow
equilibrium apparatus system was used to measure the
solubilities of methylbenzoic acid isomers in supercritical
carbon dioxide over the temperature range from 313.2 to
333.2 K and a pressure range form 109.8 to 245.9 bar.The
solubilities within a family was found to be a function of
the melting point of the isomers,the lower the melting point
,the higher the solubilities.The results suggest that
supercritical solvents can be used to separate 2- and 3-
,or 3- and 4- methylbenzoic acid isomers. The measured mole
fractions of methylbenzoic acid are correlated using the
model proposed by Chrastil,and as predicted by this model,
a linear relationship between the logarithm of the solubility
and the logarithm of the density of carbon dioxide was
obtained.
|
|---|
