PLS models for determination of SARA analysis of Colombian vacuum residues and molecular distillation fractions using MIR-ATR

• Main Authors: Jorge A. Orrego-Ruiz, Rafael Cabanzo, Enrique Mejía-Ospino
• Format: Article
• Language: English
• Published: Universidad Industrial de Santander 2014-06-01
• Series: Revista Ion
• Subjects: MIR-ATR; PLS; SARA analysis; molecular distillation; vacuum residue
• Online Access: http://revistas.uis.edu.co/index.php/revistaion/article/view/4144/4462

In this work, prediction models of Saturates, Aromatics, Resins and Asphaltenes fractions (SARA) from thirty-seven vacuum residues of representative Colombian crudes and eighteen fractions of molecular distillation process were obtained. Mid-Infrared (MIR) Attenuated Total Reflection (ATR) spectroscopy in combination with partial least squares (PLS) regression analysis was used to estimate accurately SARA analysis in these kind of samples. Calibration coefficients of prediction models were for saturates, aromatics, resins and asphaltenes fractions, 0.99, 0.96, 0.97 and 0.99, respectively. This methodology permits to control the molecular distillation process since small differences in chemical composition can be detected. Total time elapsed to give the SARA analysis per sample is 10 minutes.