resumo
In the present work, a group contribution method is proposed for the estimation of viscosity of fatty compounds and biodiesel esters as a function of the temperature. The databank used for regression of the group contribution parameters (1070 values for 65 types of substances) included fatty compounds, such as fatty acids, methyl and ethyl esters and alcohols, tri- and diacylglycerols, and glycerol. The inclusion of new experimental data for fatty esters, a partial acylglycerol, and glycerol allowed for a further refinement in the performance of this methodology in comparison to a prior group contribution equation (Ceriani, R.; Goncalves, C. B.; Rabelo, J.; Caruso, M.; Cunha, A. C. C.; Cavaleri, F. W.; Batista, E. A. C.; Meirelles, A. J. A. Group contribution model for predicting viscosity of fatty compounds. J. Chem. Eng. Data 2007, 52, 965-972) for all classes of fatty compounds. Besides, the influence of small concentrations of partial acylglycerols, intermediate compounds in the transesterification reaction, in the viscosity of biodiesels was also investigated.
palavras-chave
PARAMETERS; ESTERS
categoria
Energy & Fuels; Engineering
autores
Ceriani, R; Goncalves, CB; Coutinho, JAP
nossos autores
João Manuel Costa Araújo Pereira Coutinho
Vice-Diretoragradecimentos
Roberta Ceriani and Cintia B. Goncalves acknowledge financial support from Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP 2008/56258-8 and 2010/16634-0) and Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq). Roberta Ceriani also acknowledges CNPq for her Grant (301999/2010-4). The authors are grateful for the help of Maria Jorge Pratas on the biodiesel synthesis.