Research on Determination of Total Acid Number of Petroleum Using Mid-infrared Attenuated Total Reflection Spectroscopy

Total acid number (TAN) is one of the most important parameters for petroleum. The combined use of multivariate calibration and mid-infrared attenuated total reflection spectroscopy allows it to be estimated accurately. The calibration models of acid number have been established by partial least-squares (PLS). The predictive ability of the IR technique with regard to the TAN have been explored. The results predicted by this method were very close to those determined by standard methods. Compared with Standards, this method is provided with advantages such as high speed, simplicity, no pretreatment, and good-repeatability.