Artículos de revistas
Synthesis Of Biodiesel: A Contextualized Experiment Proposal For The General Chemistry Laboratory [síntese De Biodiesel: Uma Proposta Contextualizada De Experimento Para Laboratório De Química Geral]
Registro en:
Quimica Nova. , v. 30, n. 5, p. 1374 - 1380, 2007.
1004042
2-s2.0-36148954268
Autor
Rinaldi R.
Garcia C.
Marciniuk L.L.
Rossi A.V.
Schuchardt U.
Institución
Resumen
The contextualized understanding of concepts in Chemistry by students from other areas is a challenging task. In this experiment, the synthesis of biodiesel is done by base catalyzed transesterification of refined soy oil with methanol at room temperature and common glassware found in any chemistry laboratory. The proposal permits introducing several concepts, such as that of emulsion, viscosity and catalysis to illustrate an activity based on an actual problem. In this didactic approach, some common problems of biodiesel production, such as soap formation and phase separation, are introduced into the procedure in order to raise questions and motivate the students to participate in the experimental work and stimulate reflections about critical aspects of biodiesel production. This experiment was carried out in the first semester of 2006, in experimental general chemistry taken by physics and agricultural, civil and chemical engineering students of UNICAMP. 30 5 1374 1380 Zaher, F.A., (1990) Grasas y Aceites, 41, p. 82 Shay, E.G., (1993) Biomass Bioenergy, 4, p. 227 http://www.biodieselbr.com/biodiesel/motor-diesel/motor-diesel.htm, acessada em Junho 2006Gunstone, F. D. Padley, F. B. Lipid Technologies and Applications, M. Dekker: New York, 1997, cap. 30 e 31Schuchardt, U., Ribeiro, M.L., Gonçalves, A.R., (2001) Quim. Nova, 24, p. 247 Streitwieser, A., Heathcock, C.H., Kosower, E.M., (1992) Introduction to Organic Chemistry, , 4th ed, Macmillan: New York Pinto, A.C., Guarieiro, L.L.N., Rezende, M.J.C., Ribeiro, N.M., Torres, E.A., Lopes, W.A., Pereira, P.A.P., de Andrade, J.B., (2005) J. Braz. Chem. Soc, 16, p. 1313 Costa Neto, P.R., Rossi, L.F.S., Zagonel, G.F., Ramos, L.P., (2000) Quim. Nova, 23, p. 531 Tashtoush, G., Al-Widyan, M.I., Al-Shyoukh, A.O., (2003) Appl. Therm. Eng, 23, p. 285 Schwab, A.W., Dykstra, G.J., Selke, E., Sorenson, S.C., Pryde, E.H., (1988) J. Am. Oil Chem. Soc, 65, p. 1781 Knothe G. van Gerpen, J. Krahl, J. The Biodiesel Handbook, AOCS Press: Champaign, Illinois, 2005, cap. 2 e 4Tyson, K.S., Bozell, J., Wallace, R., Petersen, E., Moens, L., (2004) Biomass Oil Analysis: Research Needs and Recommendations, , National Renewable Energy Laboratory: Golden, Colorado Baumann, H., Bühler, M., Fochem, H., Hirsinger, F., Zoebelein, H., Falbe, J., (1988) Angew. Chem., Int. Ed, 27, p. 41 Bondioli, P., (2004) Top. Catal, 27, p. 77 Hoydonckx, H.E., De Vos, D.E., Chavan, S.A., Jacobs, P.A., (2004) Top. Catal, 27, p. 83 Schuchardt, U., Sercheli, R., Vargas, R.M., (1998) J. Braz. Chem. Soc, 9, p. 199 Ferrari, R.A., Oliveira, V., da, S., Scabio, A., (2005) Quim. Nova, 28, p. 19 Freedman, B., Pryde, E.H., Mounts, T.L., (1984) J. Am. Oil Chem. Soc, 61, p. 1638 Parente, E.J.S., (2003) Uma Aventura Tecnológica Num País Engraçado, , Unigráfica: Fortaleza Clarke, N.R., Casey, J.P., Brown, E.D., Oneyma, E., Donaghy, K.J., (2006) J. Chem. Educ, 83, p. 257 Akers, S.M., Conkle, J.L., Thomas, S.N., Rider, K.B., (2006) J. Chem. Educ, 83, p. 260 Shaw, D.J., (2000) Colloid and Surface Chemistry, pp. 263-269. , 4th ed, Butterworth Heinemann: Oxford Jafelicci Jr., M., Varanda, L.C., (1999) Química Nova na Escola, (9), p. 18 Barbosa, A.B., Silva, R.R., (1995) Química Nova na Escola, (2), p. 3 Daintith, J., (2000) A Dictionary of Chemistry, p. 111. , 4th ed, Oxford University Press: Oxford http://sbqe2.foco.fae.ufmg.br/viscosidade2, acessada em Junho 2006Gunstone, F.D., Harwood, J.L., Padley, P., (1994) The Lipid Handbook, , 2nd ed, Chapman and Hall: London