2021
DOI: 10.1021/acs.jced.1c00633
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Separation of Pimelic Acid Using Tri-n-octylamine in Various Organic Solvents by Reactive Extraction: Equilibrium and Modeling

Abstract: Separation of carboxylic acids from dilute aqueous solutions is a challenging problem, and reactive extraction has been examined as an attractive alternative for this process. This study aims to investigate the reactive extraction of pimelic acid (PA) using tri-n-octylamine (TOA) in 1-hexanol, 1-octanol, xylene, and n-hexane. The highest extraction efficiency (E (%)) and distribution coefficient (K D ) were obtained at pH 3, which is the unadjusted pH of the aqueous PA solution. Extractive efficiency varied in… Show more

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Cited by 6 publications
(10 citation statements)
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“…Although the concentration of protonated LA was higher at pH 1, the yields were lower than those obtained at pH 2.1. Tertiary amines, i.e., TOA, preferably reacts with the strongest acid in the medium, in this case, HCl. , Since the concentration of HCl in the solution was relatively low, only a < 10% decrease was observed at pH 1.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Although the concentration of protonated LA was higher at pH 1, the yields were lower than those obtained at pH 2.1. Tertiary amines, i.e., TOA, preferably reacts with the strongest acid in the medium, in this case, HCl. , Since the concentration of HCl in the solution was relatively low, only a < 10% decrease was observed at pH 1.…”
Section: Resultsmentioning
confidence: 99%
“…The strength of the bond is dependent upon the stability of the partially charged proton donors and acceptors. ,, If the extractant has a greater basicity than the anion of the solute, complex extraction of protonated carboxylic acids with aliphatic tertiary amines involves the ion pair formation between these molecules and transfer of the target molecule to the organic phase (eq ) and the complexation constant can be calculated using eq . Thus, concentration of the undissociated or protonated acid portion in the aqueous medium plays a key role in the extraction with aliphatic amines. , Extraction performance of the process was evaluated by the extraction efficiency ( E (%)) and distribution coefficient ( K D ) as expressed in eqs and , respectively. HL aq + TOA org false( HL TOA false) org K E = false[ false( HL TOA false) org false] [ ( HL ) aq ] · [ ( TOA ) org ] E ( % ) = [LA] org [LA] o × 100 K D = [LA] org [LA] aq …”
Section: Theorymentioning
confidence: 99%
“…The contact of organic and aqueous phases during the extraction process is important for efficient extractive separations. , Extraction agents can be viscous chemicals that they may not provide sufficient contact of the phases, resulting in lower extraction efficiencies. In addition, the extraction agent itself may not form a stable complex with the target solute.…”
Section: Resultsmentioning
confidence: 99%
“…Nonetheless, they are useful for removing the target acid from the organic phase to the aqueous phase. 5 The scientific literature provides numerous extraction studies and modeling methods for the reactive extraction of LA from aqueous solutions. Kumar, S. et al, 6 Kumar, T. P. et al, 7 and Kumar, A. et al, 8 studied the reactive extraction of LA with trioctylamine (TOA) dissolved in different organic diluents.…”
Section: ■ Introductionmentioning
confidence: 99%
“…On the other hand, when inert diluents such as alkanes and alkyl-substituted aromatics are utilized, the partition of carboxylic acid in the organic phase is low. Nonetheless, they are useful for removing the target acid from the organic phase to the aqueous phase …”
Section: Introductionmentioning
confidence: 99%