关键词: 原油, 密度, 偏最小二乘, 红外光谱, 快速评价

Abstract: The combined use of mid-infrared attenuated total reflection spectroscopy and multivariate calibration to determine the density of crude oil was carried out. Calibration models for crude oil density were established by partial least squares (PLS) based on 280 crude oil samples collected worldwide. Results show that the standard deviation of cross-verification is 0.005 1 g/cm3 and the predicted standard deviation is 0.004 4 g/cm3, which are all close to the requirements of standard method, which indicates that the results predicted by this method are very close to those determined by standard method. As compared with the U-tube vibration method this method is quick and easy to operate, its result could meet the requirements of fast analysis/process control analysis, and in certain cases it could substitute the U-tube method for fast prediction of crude oil density.

Key words: crude oil, density, partial least squares, infrared spectroscopy, fast evaluation