Izvorni znanstveni članak
Separation of p-Aminobenzoic Acid by Reactive Extraction in the Presence of 1-Octanol as Phase Modifier
A.-I. Galaction
; University of Medicine and Pharmacy “Gr. T. Popa” of Iasi, Faculty of Medical Bioengineering, Dept. of Biotechnologies, M. Kogalniceanu 9–13, 700454 Iasi, Romania
L. Kloetzer
; Technical University “Gh. Asachi” of Iasi, Faculty of Chemical Engineering and Environmental Protection, Dept. of Biochemical Engineering, D. Mangeron 71, 700050 Iasi, Romania
D. Caşcaval
; Technical University “Gh. Asachi” of Iasi, Faculty of Chemical Engineering and Environmental Protection, Dept. of Biochemical Engineering, D. Mangeron 71, 700050 Iasi, Romania
Sažetak
The paper presents the studies on reactive extraction of p-aminobenzoic acid with two extractants (Amberlite LA-2 and D2EHPA) dissolved in two solvents with different dielectric constants (n-heptane, dichloromethane), at various 1-octanol concentrations in
the solvent. The addition of 1-octanol induced the increase of the extraction efficiency, the most important influence being recorded for the solvent with lower polarity (n-heptane). Moreover, the volumetric fraction of alcohol controls the number of extractant molecules participating in the interfacial product formation. This effect was
more important for the extraction in low-polar solvent and was concretized in the reduction of number of Amberlite LA-2 molecules included in the interfacial compound from 3, in the absence of alcohol, to 1, for φ = 20 % alcohol. Indifferent to alcohol fraction in
organic phase, for the reactive extraction with D2EHPA in n-heptane, the number of extractant molecules decreased from 2, in the absence of 1-octanol, to 1 in the presence of 1-octanol. The limitation of solute solvation by extractant due to the increase of solvent polarity led to the reduction of the extraction constant and to the amplification of the differences between the extraction constants obtained for the same extractant and the two solvents.
Ključne riječi
p-Aminobenzoic acid; Amberlite LA-2; D2EHPA; 1-octanol; reactive extraction
Hrčak ID:
55019
URI
Datum izdavanja:
1.7.2010.
Posjeta: 945 *