Effect of hydrotropes on solubility and mass transfer coefficient of methyl salicylate

Citation
Md. Kumar et Nn. Gandhi, Effect of hydrotropes on solubility and mass transfer coefficient of methyl salicylate, J CHEM EN D, 45(3), 2000, pp. 419-423
Citations number
21
Categorie Soggetti
Chemistry,"Chemical Engineering
Journal title
JOURNAL OF CHEMICAL AND ENGINEERING DATA
ISSN journal
00219568 → ACNP
Volume
45
Issue
3
Year of publication
2000
Pages
419 - 423
Database
ISI
SICI code
0021-9568(200005/06)45:3<419:EOHOSA>2.0.ZU;2-5
Abstract
This paper presents a comprehensive study on the effect of citric acid, sod ium benzoate, sodium salicylate, and urea (hydrotropes) on the solubility a nd mass transfer coefficient for the extraction of methyl salicylate in wat er. A Minimum Hydrotropic Concentration (MHC) in the range between 0.20 and 0.90 mol/L was found essential to show a significant increase in the solub ility and mass transfer coefficient for the methyl salicylate-water system. The solubility of methyl salicylate has been increased to a maximum value of 22.84 in the presence of citric acid as hydrotrope at concentration of 2 .00 mol/L and temperature of 333 K. The maximum enhancement factor for the mass transfer coefficient was found to be 7.88 in the presence of citric ac id as hydrotrope at a concentration of 2.00 mol/L at 303 K at 600 rpm. The Setschenow constant, K,, a measure of the effectiveness of the hydrotrope, has been determined for each case, and the highest value has been observed as 0.743 in the case of citric acid.