Browsing by Author "Aydinli, B, Caglar, A"

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A degradation kinetic study on pyrolysis of three biomass samples and Co-pyrolysis of hazelnut shell and ultra-high molecular weight polyethylene blends using a silver indicator
(2013-05-15) Aydinli B., Caglar A.; Aydinli, B, Caglar, A
A kinetic study was proposed in pyrolysis process supplementary to thermo-gravimetric analysis. Three different biomasses, hazelnut shell, olive residue, and tea waste, and hazelnut shell and ultra-high molecular weight polyethylene mixture were analyzed kinetically in a batch-type tubular pyrolysis reactor. Reaction times were measured with the changing color of silver indicator, which was attached to the terminal of pyrolysis set up at various specified temperatures between 623 and 923 K. The Arrhenius plots were obtained and the activation energies (Ea) of reaction values were calculated from the slope of linear curves. For pure biomass, two linear degradation zones were detected possibly belonging to cellulose and hemicellulose. In the case of hazelnut shell and ultra-high molecular weight polyethylene mixtures, linearity of Arrhenius plots were grasped with the modification of the pre-exponential factor of the basic Arrhenius equation. This type of kinetic method directly involves the basic parameters, namely, reaction time and temperature for supplementation of kinetic analysis. © 2013 Copyright Taylor and Francis Group, LLC.
The comparison of hazelnut shell co-pyrolysis with polyethylene oxide and previous ultra-high molecular weight polyethylene
(2010-01-01) Aydinli B., Caglar A.; Aydinli, B, Caglar, A
The importance of renewable energy sources has gained ultimate urgency due to environmental impacts in last decades. Thermochemical conversion process especially pyrolysis is preferred in waste disposal, and energy and chemical matter production. Flash pyrolysis of hazelnut shell (HS) and polyethylene oxide (PEO) blends were executed in hand-made reactors at various ratios at 485, 515, 550, 600 and 650 °C. Liquid, solid and gas products amounts were determined by gravimetry. The same process was carried out previously for HS and ultra-high molecular weight polyethylene (UHMWPE). Pyrolysis studies of these blends were compared in terms of product yields, interaction between components which are called synergistic effect and the influence of structure and hydrophilicity of polymers on pyrolysis of HS by some graphical tools. Existence of interactions between constituents is proved by comparing the result of experimental liquid, solid and gas products yields with rationally calculated yields at various ratios from pure HS and polymers from pyrolysis process. The directions of interactions of HS with PEO and UHMWPE are different within which HS and PEO produces high liquid and solid product yields, and HS and UHMWPE yields high gas product with respect to each other. Simply, these findings present some clues about interaction mechanism ways without any instrumental techniques. Crown Copyright © 2010.
The investigation of the effects of two different polymers and three catalysts on pyrolysis of hazelnut shell
(2012-01-01) Aydinli B., Caglar A.; Aydinli, B, Caglar, A
This study covers an investigation of three catalyst candidates namely; calcium carbonate (CaCO3), Perlite and potassium dichromate (K 2Cr2O7) on pyrolysis of mixtures of hazelnut shell (HS) with ultra-high molecular weight polyethylene (UHMWPE) and polyethylene oxide (PEO) by measuring percentages of solid, liquid and gas products amounts gravimetrically. Pyrolysis processes were executed in a batch type tubular reactor at 500 and 650 °C for fifteen minutes. Catalysts have behaved differently on compounded mixtures. Especially the obtained liquid products from pyrolysis of mixtures shows smooth distribution compared to anomalous results of pure raw materials. The effect of catalysts on the pyrolysis of HS becomes more obvious in the presence of polymers which produces more gaseous product for K2Cr2O7 case. The other catalysts (CaCO3, Perlite) are more effective without addition of polymers which produce more liquid products. The ratio of HS should not be beyond the 0.5 for production of commercial materials and in their possible recycling process such as pyrolysis for acquisition of combustible liquids. These results may allow some clues for compounding of environmentally safe commercial materials, and easy and efficient recycling technologies. © 2011 Elsevier B.V. All rights reserved.