Transesterification reactions free of catalyst between roasted chicken fat with methanol were carried out in a batch reactor in order to produce biodiesel to temperatures from 120°C to 140°C. Parameters related to the transesterification reactions, including temperature, time and the molar ratio of chicken fat to methanol also investigated. The maximum yield of the reaction was of 98% under conditions of 140°C, 4 h of reaction time and a molar ratio of chicken fat to methanol of 1:31. The biodiesel thus obtained exhibited a viscosity of 6.3 mm2/s and a density of 895.9 kg/m3. The results showed this process can be right choice to produce biodiesel since this process does not use any catalyst. Therefore, the steps of neutralization and washing are avoided, indispensables in the case of the alkaline catalysis., {"references":["Servicio de Información Agroalimentaria y Pesquera (SIAP). Resumen\nNacional de la Producción Pecuaria; 2012 http://www.siap.gob.mx/\nindex.php?option =com_wrapper&view=wrapper&Itemid=369 (verified\n2014.09.12).","Financiera Rural. Monografía del Pollo; 2012\nhttp://www.financierarural.gob.mx/informacionsectorrural/Documents/\nMonografias/Monograf%C3%ADaPollo(feb12).pdf (verified\n2014.09.12).","A. E. Atabani, A. S. Silitong, I. A. Braduddin, T. M. I. Mahlia, H. H.\nMasjuki, S. MMekhilef, \"A comprehensive review on biodiesel as an\nalternative energy resource and its characteristics,\" Renewable and\nSustainable Energy Reviews, vol. 16, pp. 2070-2093, 2012.","M. Canakci, \"The potential of restaurant waste lipids as biodiesel\nfeedstocks,\" Bioresource Technology, vol. 98, pp. 183–190, 2007.","Y. Liu, E. Lotero, J. G. Goodwin, X. Mo, \"Transesterification of poultry\nfat with methanol using Mg–Al hydrotalcite derived catalysts,\" Applied\nCatalysis A: General, vol. 331, pp.138–148, 2007.","U. R. Kreutzer, \"Manufacture of fatty alcohols based on natural fats and\noils,\" Journal of the American Oil Chemist Society, vol.61, pp. 343-348,\n1984.","S. Saka, D. Kusdiana, \"Biodiesel fuel from rapeseed oil as prepared in\nsupercritical methanol\", Fuel, vol.80, pp.225-231, 2001.","J. Ramirez-Ortiz, J. Medina-Valtierra, M. Martinez Rosales, \"Used\nfrying oil for biodiesel production over kaolinite as catalyst,\" World\nAcademy of Science, Engineering and Technology, vol.80, pp.977-980,\n2011.","S. Schober I. Seidi, Mittelbach, \"Ester content evaluation in biodiesel\nfrom animal fats and lauric oils,\" European Journal of Lipid Science and\nTechnology, vol.108, pp. 309–314, 2006.\n[10] Y. I. Tur'yan, E. Kardash, I. Garibian, \"pH-metric determination of free\nfatty acids in oils and fats during frying in the absence of a chemical\nlaboratory,\" Journal of the American Oil Chemist Society, vol.85, pp.\n91-92, 2008.\n[11] AOAC Official Method 920.159 Iodine absorption number of oils and\nfats Wijis method. Oils and Fats. 1997, chapter 41, pp7.\n[12] AOAC Official Method 920.160 Saponification number of oils and fats.\nOils and Fats. 1997, chapter 41, pp9B.\n[13] H. Zhu, Z. Wu, Y. Chen, P. Zhang, S. Duan, X. Liu, Z. Mao,\n\"Preparation of biodiesel catalyzed by solid super base of calcium oxide\nand its refining process,\" Chinese Journal of Catalysis, vol.27, pp. 391–\n396, 2006.\n[14] D. Reyman, A. Saiz, I. Ramirez, M. Rodriguez, \"A new FTIR method to\nmonitor transesterification in biodiesel production by ultrasonication,\"\nEnvironmental Chemistry Letters, vol.12, pp. 235-240, 2014.\n[15] N. N. Ahmad, J. M. Nazrim, D. M. Hashim, \"Differentiation of lard,\nchicken fat, beef fat and mutton fat by GCMS and EA-IRMS\ntechniques,\" Journal of oleo science, vol. 62, pp. 459-464, 2013.\n[16] W. Shi, J. Li, B. He, F. Yan, Z. Cui, K. Wua, L. Lin, X. Qian, Y. Cheng,\n\"Biodiesel production from waste chicken fat with low free fatty acids\nby an integrated catalytic process of composite membrane and sodium\nmethoxide,\" Bioresource Technology, vol.139, pp.316-322, 2013.\n[17] P-L. Boey, G. P. Maniam, S. A. Hamid, A. D. M. Hag, \"Crab and cockle\nshells as catalysts for the preparation of methyl esters from low free fatty\nacid chicken fat,\" Journal of the American Oil Chemist Society, vol.88,\npp.283–288, 2011.\n[18] E. Alptekin, M. Canakci, \"Optimization of pretreatment reaction for\nmethyl ester production from chicken fat,\" Fuel vol.89, pp.4035–4039,\n2010."]}