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    Desulfurization of southeastern Anatolian asphaltites by the Meyers method
    (Elsevier Science Bv, 1997) Hamamci, C; Kahraman, F; Duz, MZ
    Southeastern Anatolian asphaltites are notoriously high in sulfur and therefore not suitable for direct use in combustion without extensive cleaning. In order to remove sulfur from asphaltites collected from Sirnak and Hazro, the Meyers (Fe3- salts) method was used. The effects of ferric concentration, coal particle size, temperature and time on the extraction efficiency were investigated and the experimental results are presented here. Most of the pyritic and sulfate sulfur was eliminated from the asphaltite samples. (C) 1997 Elsevier Science B.V.
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    Öğe
    Selective oil agglomeration in Sirnak asphaltite beneficiation
    (Elsevier Sci Ltd, 2004) Abakay, H; Ayhan, FD; Kahraman, F
    In this study, the possibility of cleaning Sirnak asphaltite by the agglomeration method was investigated. Experimental studies were conducted on the asphaltite sample with ash, sulphur, volatile matter and fixed carbon contents of 44.8, 6.0, 38.0, and 17.2 wt%, respectively. For this purpose, laboratory tests were carried out to investigate the effects of grinding time, bridging liquid type, bridging liquid concentration, pulp density and agitator speed on the overall performance of the agglomeration process. Furthermore, the effects of sea water and lake water on the combustible recovery and ash contents of the agglomerated products were investigated. The optimum conditions determined were: grinding time: 50 min, bridging liquid type: 50% kerosene + 50% fuel oil, bridging liquid concentration: 30%, pulp density: 12.5%, stirring speed: 1800 rpm. It was found that the effects of sea water and lake water on the removal of ash were negative. (C) 2004 Elsevier Ltd. All rights reserved.
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    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.