On the Possibilities of Multidimensional Equidistant Absorption Spectroscopy in a Wide Frequency Range in Studies of Fractions of Thermal Distillation of Oil

Abstract

The features and possibilities of absorption molecular spectroscopy of complex mixtures of organic compounds have been studied by the example of fractions of thermal distillation of oil. Oil samples were taken from a pipeline through which oil comes from various fields. To ensure independent (relative to the field) sampling of oil, sampling was carried out with an interval of three months. The task of studying the spectra of oil fractions as a single integral object (i.e., without studying the molecular composition) of complex molecular composition was directly solved. In connection with this, multidimensional equidistant spectra were subjected to processing in a wide spectral range. Measurements were made under the following conditions: frequency range of from 500 to 1500 cm–1, spectral resolution of 1 cm–1 and frequency change step of 0.5 cm–1. The studied objects were 33 fractions of thermal distillation of oil. The processing of the results of spectroscopic measurements was carried out using multivariate mathematical statistics methods. The efficiency of using molecular absorption spectroscopy in the mid-IR region to study and control the optical characteristics (absorption spectra) of thermal oil distillation fractions is shown.