Extraction of Dicarboxylic Acids by ABC Extractants

Eyal, Aharon M.; Vitner, A.; Hazan, B.

doi:10.1081/sei-120027573

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…As suggested in our previous articles, [1,2] extractions of both lactic acid and malic acid by A336-containing extractants (A336-LA, A336-D2EHPA, and A336-DNNSA) are governed by the H-bonding mechanism since the basicities of the amine and of the extracted-acids' anion are similar. In all those systems, except for malic acid extraction with A336-D2EHPA, temperature elevation decreases the extraction significantly.…”

Section: Extraction Of Carboxylic Acids By Abc Extraction 75mentioning

confidence: 92%

“…Yet, there is probably an additional effect related to extraction via H-bonding to the amine-lipophilic acid ion-pair. As explained in our previous articles, [1,2] primary amines have a much higher capability of forming H-bonds with both lipophilic acid and extracted acid, compared with tertiary amines, due to smaller steric hindrance and larger number of protons available for interaction. These parameters also enhance interactions between the amine-lipophilic acid ion-pairs, which compete with acid extraction through H-bonding to the ion-pairs.…”

Section: Extraction Of Carboxylic Acids By Abc Extraction 75mentioning

confidence: 94%

“…In addition to the ion-pair mechanism, it has contribution from H-bonding, mainly with the ion-pair. [2] Increasing the concentration of LA in the extractant has only small effects, both through competition for ion-pair formation and by increasing the polarity of the extractant, as in the case of lactic acid extraction. Yet, LA competes with malic acid for H-bonding to the ion-pair and decreases extraction thereby.…”

Section: Reprintsmentioning

confidence: 99%

“…[2] 2. Systems with higher steric hindrance are more sensitive to temperature elevation than systems with lower hindrance.…”

Section: Extraction Of Carboxylic Acids By Abc Extraction 75mentioning

confidence: 99%

“…[1] That article shows the various species formed in the extractant itself, according to the properties of its components, and presents the results of a study on extracting monocarboxylic acids with ABC-extractants. The second article [2] deals with the extraction of dicarboxylic acids. The present article deals with the effects of other controlling parameters.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of Carboxylic Acids by ABC Extractants: Effects of Temperature, the Polarity of the Diluent, and the Ratio Between Extractant Components

Eyal

Vitner

Hazan

2004

Solvent Extraction and Ion Exchange

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A study was conducted of the temperature effect on the extraction of lactic and malic acid by acid-base couple (ABC) extractants in kerosene. Elevating the temperature from 308C to 808C decreases the extraction of both acids by ABC extractants comprising tricaprylyl amine (A336). The opposite effect is found for the extraction of lactic acid by primary aminecontaining ABC extractants. It seems that temperature effect in the extraction of lactic and malic acids by ABC extractants results, at least partially, from competition for H-bonding. The study has also tested the effect of diluent polarity in ABC extractants by replacing kerosene there with octanol. It has shown that increased polarity affects the extraction of 69 ORDER REPRINTS carboxylic acids mainly through stabilization of ion pairs and formation of H-bonds. Another studied effect was that of the ratio between the amine and the lipophilic acid in the ABC extractants. The results were found to depend on the acid-base properties, polarity, and structure of these components and on the properties of the extracted acid.

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Section: Extraction Of Carboxylic Acids By Abc Extraction 75mentioning

confidence: 92%

Section: Extraction Of Carboxylic Acids By Abc Extraction 75mentioning

confidence: 94%

Section: Reprintsmentioning

confidence: 99%

“…[2] 2. Systems with higher steric hindrance are more sensitive to temperature elevation than systems with lower hindrance.…”

Section: Extraction Of Carboxylic Acids By Abc Extraction 75mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%