Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia

OP-1-2METHANOLYSIS OF VEGETABLE OILS IN THE PRESENCE OFALKYL TIN(IV) CATALYST: INFLUENCE OF TEMPERATURE ANDREACTION CONDITIONS ON THE CATALYST ACTIVITYMario R. Meneghetti, Tatiana Maciel Serra, Daniel R. de Mendonça,Jhosianna P. Vilela da Silva, Simoni M. P. MeneghettiInstituto de Química e Biotecnologia, Universidade Federal de Alagoas, Av. Lourivalde Melo Mota, s/ nº, Maceió-AL, Brazil – 57072-970, mrmeneghetti@gmail.comThe complex dibutyltin dilaurate, (C 4 H 9 ) 2 Sn(C 12 H 23 O 2 ) 2 , was used as catalyst forthe methanolysis of soybean and castor oils, in different reaction conditions(temperature, open or close reactor). The catalytic system was active formethanolysis of soybean oil and castor oil, and display an increment of the reactionyield, measured in terms of % FAMEs formed, at higher reaction temperatures (Table1). The reactions conduced in pressurized container (close reactor) show betterresults and this observation can be associated to a favorable change in phaseequilibrium, with consequent increase in the concentration of methanol in the liquidphase [1].Table 1. Yield of FAMEs (%) by the methanolysis of soybean and castor oilT (°C)ReactorYield in Biodiesel (FAMEs %) fromCastor OilSoybean Oil80 Reflux 4 1380 Pressurized container 9 48120 Pressurized container 53 77150 Pressurized container 64 98We suggest that the difference of yields observed between for the methanolysisof the two oils cab be related at two factors: i) due to the atypical chemicalcomposition of castor oil, that is comprised almost entirely (ca. 90%) of triglyceridescontaining the unusual fatty acid ricinoleic acid (12-hydroxy-cis-octadec-9-enoicacid). The hydroxyl group at C-12 of ricinoleic acid can interact with Lewis acidcatalytic site decreasing the reaction yield; ii) due to mass transfer problems, sincethe high viscosity of castor oil and the biodiesel formed input difficulties of diffusionalnature [1].References:[1]. D.R. Mendonça, J.P.V. da Silva, R.M. de Almeida, C.R. Wolf, M.R. Meneghetti,S.M.P. Meneghetti, Appl. Catal. A, 365 (2009) 105-109.Acknowledgements: CAPES, CNPq, FINEP, FAPEAL.25