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Extraction of organic acids by ion-pair formation with tri-n-octylamine : Part 4. Influence of organic phase composition

โœ Scribed by M. Puttemans; L. Dryon; D.L. Massart

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
414 KB
Volume
178
Category
Article
ISSN
0003-2670

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โœฆ Synopsis

Synthetic food dyes are extracted by ion-pair formation with tri-n-octylamine. Mixed organic phases are used, consisting of mixtures of hexane with one of the following solvent modifiers: chloroform, dichloromethane, methyl isobutyl ketone, butyl acetate or pentanol. Logarithmic plots of the distribution ratio versus the volume fraction of the solvent modifier are linear for dichloromethane, chloroform and pentanol. The efficiency of the solvents is classified as follows: dichloromethane > pentanol > chloroform > methyl isobutyl ketone > butyl acetate > hexane. The addition of pentanol to chloroform provides nearly quantitative recovery for hydrophilic solutes.

๐Ÿ“œ SIMILAR VOLUMES

Extraction of organic acids by ion-pair
Extraction of organic acids by ion-pair formation with tri-n-octylamine : Part 2. Back-extraction
โœ M. Puttemans; L. Dryon; D.L. Massart ๐Ÿ“‚ Article ๐Ÿ“… 1984 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 383 KB

Acids, extracted with tri-n-octylamine, are extracted back to an aqueous phase. The back-extraction is based on a displacement reaction. Several displacing ions were used: chloride, bromide, iodide, nitrate and perchlorate. The efficiency increases in the order chloride < bromide < iodide < perchlor

Extraction of organic acids by ion-pair
Extraction of organic acids by ion-pair formation with tri-n-octylamine : Part. 1. Extraction Rate and Influence of pH and Ionic Strength
โœ M. Puttemans; L. Dryon; D.L. Massart ๐Ÿ“‚ Article ๐Ÿ“… 1984 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 589 KB

The extraction scheme for dyes, developed previously, is applied to benzoic acid and its hydroxylated derivatives. Extractions are done with tri-n-octylamine at pH 5.5 and an ionic strength of 0.1 into chloroform. Equilibrium is attained in 20 min or less. The influences of pH and ionic strength of