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    Reactive extraction and LSER model consideration of lactic acid with tripropylamine plus organic solvent systems from aqueous solution at room temperature
    (Elsevier Science Bv, 2009) Uslu, Hasan; Bayat, Cuma; Gokmen, Selahattin; Yorulmaz, Yavuz
    The extraction of lactic acid was done by tripropylamine (TPA) dissolved in seven single solvents (isoamyl alcohol, heptan-1-ol. hexan-1-ol. octan-1-ol, nonan-1-ol. decan-1-ol, and dodecanol). All measurements were carried out at 298.15 K. The extent to which the organic phase may be loaded with lactic acid is expressed as loading ratio, Z its value extraction efficiencies. E, and overall particular distribution coefficients, D, were calculated. Equilibrium complexation constants for(acid:amine) (1:1), (1:2) have been determined according to Bizek's approach. The maximum removal of lactic acid accomplished was about 81% with isoamyl alcohol having 1.935 mol dm(-3) initial concentration of TPA. All of the obtained data have been correlated by linear solvation energy relationship (LSER) model. LSER model results were compared with the experimental results and well agreement between them was observed. Regression coefficient (R(2)) of LSER model is 0.972. (C) 2009 Elsevier B.V. All rights reserved.
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    Recovery of Picolinic Acid from Aqueous Streams Using a Tertiary Amine Extractant
    (Amer Chemical Soc, 2011) Tuyun, Amac Fatih; Uslu, Hasan; Gokmen, Selahattin; Yorulmaz, Yavuz
    Solvent extraction using an extractant/diluent system was determined for the recovery of picolinic acid. Trioctylamine (TOA) was used as the extractant and alcohols (isoamyl alcohol and 1-hexanol), esters (ethyl acetate and propyl acetate), and hydrocarbons (n-heptane and toluene) as the diluents. TOA gives a complex with the acid resulting in an acid-amine complex which is solvated by the diluents. On the basis of results from batch extraction experiments, a mass-action analysis was introduced for modeling extraction. The experimental results of batch extraction experiments are reported as distribution coefficients, (K(D) = (C*(PA)/C(PA))), loading factors, Z, and extraction efficiency, E. The highest synergistic extraction efficiency was found to be 96.620 for the TOA + isoamyl alcohol extractant system with a K(D) value of 28.587 and Z value of 0.588.
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    Removal Of Toxic Copper And Manganese Ions From Lefke-Gemikonagi Dam Water
    (Beykent Üniversitesi, 2007) Gokmen, Selahattin; Taser, Nilay
    In this study, Lefke-Gemikonagi dam water which contains Copper and Manganese ions in high concentrations ( Copper : 193.7 ^g/L , Manganese : 855.9 ^g/L etc.) was treated with Calcium oxide and these ions were precipitated. After treatment, dam water can be used as agricultural irrigation water in this area without any risk of toxicity.