Yazar "Özçifçi, A." seçeneğine göre listele
Listeleniyor 1 - 3 / 3
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Bio-oil production from catalytic pyrolysis method of furniture industry sawdust(2013) Özçifçi, A.; Özbay, G.In this study, scots pine (Pinus sylvestris L.) sawdust was used as biomass resources. Catalyzed and uncatalyzed (thermal) pyrolysis processes were conducted in a fixed-bed reactor. The effects of the parameters on pyrolysis product yields such as temperature and catalysis type were investigated. The pyrolysis of the experimental samples that have a particle size in the range of 0.850-1.60 mm were carried out at the temperatures of 400, 500 and 600 °C at the heating rate of 5°C/min. Nitrogen gas (N2) flow was used at the rate of 30 ml/min during the process. Basic salts such as Na 2CO3, K2CO3 and Lewis acid (FeCl3) were used as catalyses. As a result, it was determined that temperature and catalysis types were effective parameters in the yields of char, bio-oil and gas products. Also it was determined that the conversion of wood materials into fuel or valuable chemicals with the pyrolysis method is an applicable technology.Öğe Effect of various fire retardants on brinell hardness of some wood(2009) Kurt, S.; Özçifçi, A.This study was performed to determine the impact of impregnation materials on the Brinell hardness of varnished wood materials. For this purpose, test specimens prepared from Scotch pine (Pinus sylvestris L.) and Oriental beech (Fagus orientalis Lipsky), which met the requirements of ASTM D 358, were impregnated according to ASTM D 1413-07 with borax, boric acid, zinc chloride, and di-ammonium phosphate by a vacuum technique. After impregnation, the surfaces were coated by cellulosic, synthetic, and polyurethane varnishes in accordance with ASTM D 3023. The Brinell hardness of the specimens after the varnishing process was determined in accordance with ASTM D 4366. According to the result of the tests, the highest Brinell hardness (135.40 kpm/m2) was determined in oriental beech samples, cut tangentially, impregnated with di- ammonium phosphate, and varnished with polyurethane. The lowest Brinell hardness (23.20 kpm/m2) was determined in Scotch pine control samples, cut radially and synthetically varnished.Öğe Impacts of bleaching chemicals and outdoor exposure on changes in the color of some varnished woods(2010) Özçifçi, A.; Özbay, G.This study was carried out to determine the changes of the surface color of Scots pine (Pinus sylvestris L.) and Oriental beech (Fagus orientalis Lipsky) woods after exterior conditioning. First, the samples were bleached with 25% NaOH and 17.5% H2O2. Afterwards, they were varnished with polyurethane and synthetic varnishes, and then they were exposed to exterior conditions for 12 months. Tests for color differences and metric chroma were done according to the ASTM D-2244 standard. It was deduced that exposure to exterior conditions causes color differences in samples, while bleaching with the given solution reduces that effects, and reverts the surface color to that of the natural control specimens. However, bleached specimens exposed to 12 months exterior conditioning had more discoloration than those of natural control samples. In conclusion, if the wood materials will be exposed to outdoors after bleaching, finishing process should be applied to surfaces in order to prevent further color change.
