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    Öğe
    Effect of 1,3-diol structure on the distribution of boron between CHCl3 and aqueous phase
    (Marcel Dekker Inc, 2003) Karakaplan, M; Tural, S; Sunkür, M; Hosgören, H
    The various new aliphatic 1,3-diols, containing primary, secondary, tertiary, and mixed of these groups, were synthesized and used for the solvent extraction of boron. Diols (8a, 8b, 9, 10a, 10b, 11, 12a, 12b, 13) were prepared from (beta-hydroxy carbonyl compounds 1-7. The fixed standard solution of boric acid of 1.00x10(-2) M was extracted with 0.1 M and 0.5 M diols at equilibrium pH of 2 and at constant ionic strength (I=0.5). The best extracting reagent was found to be 11, which is a primary-tertiary class of -OH groups and methyl groups as a substituent on the second carbon of 1,3-diol.
  • [ X ]
    Öğe
    Solvent extraction of boron with 1,2-dihydroxy-4-oxadodecane (DHD) in n-amyl alcohol
    (Marcel Dekker Inc, 1997) Hosgoren, H; Tural, S; Kahraman, F; Togrul, M; Karakaplan, M
    In the work presented here, 1,2-dihidroxy-4-oxadodecane (DHD) was synthesized and used for the solvent extraction of boron. DHD was prepared from glycidol and octanol by thermal epoxide ring opening reaction without using acid or base catalyst. The structure of this new extracting reagent was identified according to its spectroscopic data i.e. C-13 NMR, H-1 NMR and elemental analysis results. The fixed 10(-4) M was extracted with different volume standard solution of boron (as borax) of 10 ratios of DHD and n-amyl alcohol (AA) at different equilibrium pH values. The best extraction result was obtained at high pH values with a mixture of equal volumes of DHD and n-amyl alcohol. The different equilibrium pH values were plotted against the extraction yields (%R) and the pH(0.5) value was determined by using this graph. The extraction of boron from aqueous solutions with equal volumes of DHD and various solvents were studied and it was found that petroluem ether, n-amyl alcohol and diisopropyl ether are convinient solvents for boron extraction. Stripping of boron loaded organic phase was achieved with H2SO4 aqueous solutions. The effect of stripping as a function of H2SO4 cocentration was also studied.
  • [ X ]
    Öğe
    The solvent extraction of boron with synthesized aliphatic 1,3-diols
    (Taylor & Francis Inc, 2004) Karakaplan, M; Tural, S; Tural, B; Turgut, Y; Hosgören, H
    A variety of aliphatic 1,3-diols (4a-c, 5a-c, 6a-c) was synthesized from beta-hydroxy carbonyl compounds (1-3) for potential use in the solvent extraction of boron. Primary-secondary and primary-tertiary alcohol structures of 1,3-diols substituted with isopropyl, isobutyl, and isopentyl groups have been demonstrated to be very efficient for the solvent extraction of boric acid from aqueous solutions. The extraction ability of 2,2,5-trimethyl-1,3-hexanediol (5b) was investigated as a function of 5b concentration, solution pH, solvent properties, and stripping conditions. Extraction efficiency increased with increasing concentration of 5b, and the best extraction of boron (96.8%) was found to be at an equilibrium pH of 2 with 0.5 M of 5b. Chloroform, toluene, chlorobenzene, 2-octanol, and n-amyl alcohol were found to be suitable solvents for the solvent extraction of boron. The boron complex can be recovered from the organic phase by treatment with an aqueous solution of sodium hydroxide. The highest ratio (96.7%) of boron was recovered by 0.1 M of sodium hydroxide solution.