Determinação de propriedades físico-químicas de petróleo por cromatografia gasosa de alta temperatura associada à quimiometria

Abstract

Determining the physicochemical properties of petroleum is important for rapid decision-making during the production process. True boiling point (TBP) curve is the most important parameter in the petroleum characterization andcan be estimated by high temperature gas chromatography (HTGC). In this paper, the HTGC technique associated with PLS regression was used to estimate API gravity, kinematic viscosity, pour point, carbon residue, saturated and aromatic content of98 samples with API gravity ranging from 11.4 to 54.0.PLS modelfor API gravity, carbon residue, saturates and aromatics contents show root mean square error of prediction (RMSEP) set of 1.7, 0.83 wt%, 6.76 wt% and 4.05 wt% respectively.These methods were applied in nine samples from a field of production of the Brazilian coastand presented an exact equivalent to the models developed.The models for logarithm of kinematic viscosityat 50°Cand pour point show RMSEP of 0.31 and 12°C respectively.Furthermore, tests applied in all models for evaluating the presence of systematic and trend errors indicate that there are no significant evidencesof their presencein the residues, at significance level of 5%