In this work, residues of oils Zeta and Eta have been distilled in falling film molecular distillation equipment. Special feature of molecular distillation is the fact that the process can be performed at pressures lower than 0.01 mmHg absolute. This means that the evaporation can be carried out at temperatures considerably lower than with any other method, even vacuum distillation. This produces a much milder distillation, so that fractions can be distilled without reaching the range of decomposition temperature. Starting from cuts made by molecular distillation simulated distillation was carried out with the distillation stream, for these samples in each range of temperature obtained from molecular distiller. In this work, the residue is distillate first in molecular distillation and after this product is analyze in distillation simulated. The objective is the extension of the TBP curve (True Boiling Point) and acquisition of little distillation curves obtained for each temperature in the molecular distiller through distillation simulated. The simulated distillation is a chromatographic analysis that should be capable of providing, as the final result, a distillation curve similar to the curve generated by the conventional method TBP. It was obtained a good result when compared the curve TBP extended by molecular distillation versus simulated distillation. In this methodology, the work is making with better residue, because of molecular distillation. The results are very goods when compares with others works that not use the molecular distillation first. The curves of simulated distillation completely coincide with the curve TBP extended to the two oil under study. The molecular distillation is an innovative and high technology, so this work has a great contribution to research into heavy oil. Copyright © 2009, AIDIC Servizi S.r.l.17 16151620ABBOTT, D.J., (1983) Improving the precision of simulated distillation by GC, Journal Chromatographic Science, 21 (9), pp. 425-428DORBON, M., LAMAISON, S., CHEVALIER, A., Simulated Distillation of distillates on capillary columns - influence of the polarity of the stationary phase (1991) J. Chromatography, 557 (1-2), pp. 155-162DURAND, J.P., BRÉ, A., BÉBOULENÉ, J.J., DUCROZET, A., CARBONNEAUX, S., Simulated distillation methods for petroleum fraction with minimal residue in the boiling range of 35-700 degrees C (1998) Journal Chromatography Science, 36 (9), pp. 431-434MACIEL FILHO, R., BATISTELLA, C.B., SBAITE, P., WINTER, A., VASCONCELOS, C.J.G., WOLF MACIEL, M.R., GOMES, A., KUNERT, R., Evaluation of atmospheric and vacuum residues using molecular distillation and optimisation (2006) Petroleum science and technology, pp. 3-4FERREIRA, A.A., AQUINO, F.R.N., (2005) The Distillation simulated in the Petroleum Industry, New Chemistry, , Department of Organic Chemistry, Institute of Chemistry, Federal University of Rio de Janeiro, CT, Rio de Janeiro, RJ