Yazar "Duz, M. Z." seçeneğine göre listele

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    The Characterization of Liquid Product via Flash Pyrolysis of Coal (Hazro, SE Anatolia, Turkey)
    (Taylor & Francis Inc, 2010) Saydut, A.; Duz, M. Z.; Erdogan, S.; Hamamci, C.
    Coal can be converted into a variety of secondary products, such as light hydrocarbon gases, tar, and high quality fuel char, by means of pyrolysis. Liquefaction of Hazro (Diyarbakir, SE Anatolia, Turkey) coal, -0.60 + 0.25 mm particle size, and using flash pyrolysis was performed in a fixed-bed reactor with a heating rate 40 degrees C min-1 at a temperature ranging from 400 to 800 degrees C under nitrogen atmosphere. The effect of temperature on conversion and liquid yield was examined. The flash pyrolysis temperature resulted in a large increase in the oil yield, tar, and gases; a large increase in the yield of hydrocarbon gases occurred as a result of temperature at 550 degrees C, which was attributed to an increased thermal cracking of pyrolysis vapors. Pyrolysis oil was treated with silica gel column chromatography. Using n-hexane, toluene, and methanol, the oil was separated into aliphatic, aromatic, and polar components, respectively. The fractions from silica gel chromatography of liquid product obtained both by nitrogen pyrolysis were characterized by Fourier transform infrared spectroscopy.
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    Chemical Leaching on Sulfur and Mineral Matter Removal from Asphaltite (Harbul, SE Anatolia, Turkey)
    (Taylor & Francis Inc, 2011) Saydut, A.; Duz, M. Z.; Erdogan, S.; Tonbul, Y.; Hamamci, C.
    Desulfurization and demineralization by an aqueous caustic leaching method was investigated of an asphaltite sample from Harbul (Silopi, SE Anatolia, Turkey). The effects of different parameters, such as alkali concentration, time, and temperature, on the leaching efficiency were detailed and the experimental results are presented here. The caustic concentration varied from 0.1-1.0 M, temperature was 100-180 degrees C, and leaching time varied from 4-16 h. The removal of total sulfur and ash increases with increasing alkali concentration, leaching temperature, and time. As a result of aqueous caustic leaching, the ash content of asphaltite was reduced from 32.49 to 18.00%, and 76% of combustible was recovered. Total sulfur and volatile matter content was reduced from 7.02 to 2.68% and from 46.74 to 25.10%, respectively.
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    Desulfurization and demineralization of asphaltite by aqueous caustic leaching
    (Estonian Acad Publishers, 2007) Saydut, A.; Duz, M. Z.; Hamamci, C.
    The method of desulfurization and demineralization by aqueous caustic leaching (ACL) was used for treatment of asphaltite samples front Seguruk collieries of Sirnak asphaltite fields, situated in Southeast Anatolia region of Turkey. The effect of different parameters such as alkali concentration, time and temperature on leaching efficiency was studied, and the experimental results are presented here. The concentration of caustic was varied from 0.1 to 1.0 M, temperature from 100 to 180 degrees C, and leaching time from 4 to 16 h. Elevation of alkali concentration, leaching temperature and prolongation of time increase the removal of total sulfur and ash. As a result of ACL, ash content of asphaltite was reduced from 40.08 to 22.14%, and 75% of combustible was recovered. Total sulfur and volatile matter content was reduced from 6.74 to 2.49% and from 33.72 to 19.10%, respectively.
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    Effect of molten caustic leaching on demineralization and desulfurization of asphaltite
    (Taylor & Francis Inc, 2008) Duz, M. Z.; Erdogan, S.; Saydut, A.; Merdivan, M.; Hamamci, C.
    Molten caustic leaching process is effective in reducing significant amounts of ash-forming minerals, pyritic sulfur, and organic sulfur from solid fossil fuels. The effect of leaching asphaltite samples from Seguruk and Harbul collieries of Sirnak and Silopi asphaltite fields (situated in the Southeast Anatolia region of Turkey) with molten sodium hydroxide and followed by mild acid on demineralization and desulfurization was investigated. The effects of alkali/asphaltite ratio, time, and temperature on the leaching efficiency were detailed, and the experimental results are presented here. Chemical demineralization and desulfurization of asphaltite samples using molten sodium hydroxide were investigated in the temperature range of 200 degrees C-400 degrees C. The percentage of demineralization and desulfurization increased with the increase in alkali/asphaltite ratio. The removal of total sulfur and ash increased with increasing leaching temperature and time. Most of the inorganic sulfur and a significant portion of the organic sulfur were removed.