Method for measuring contents of components in oil residue

Abstract

A method for measuring the contents of components in oil residue features that an optical spectrum array is created with the second-order differentiation of near infrared absorption spectra of the representative oil residue specimens, they are clustered by fuzzy k-average value of the characteristic variables that is the analyzed score of main component. The second-order differentiation of near infrared absorption spectra of the correcting set composed of each oil residue after clustered and the basic data measured by elution chromatography take part in regression analysis to create correct model, the main component of the second-order differentiation of near infrared absorption spectrum of unknown oil residue is analyzed for determining its type, and the contents of the main components can be calculated by the correct model. Its advantages include high correctness and speed, and environmental friend.

Description

technical field [0001] The invention relates to a method for determining residual oil components, in particular to a method for determining the content of residual oil components by using near-infrared spectroscopy combined with chemometrics. Background technique [0002] The full utilization of residual oil is one of the important means to improve the economic benefits of petroleum refineries. The composition and properties of residual oil are very important to select suitable processing conditions for residual oil and fully develop and utilize heavy oil resources. However, because the number of hydrocarbons in residual oil is very large and the structure is very complex, it is difficult to separate and identify detailed hydrocarbon groups. Residual oil is generally composed of four components: saturated hydrocarbons (Saturates), aromatic hydrocarbons (Aromatics), colloids (Resins) and asphaltene (Asphaltenes), so the determination of the so-called residual oil components ...

AI Technical Summary

Problems solved by technology

This method has the following deficiencies: (1) the basic data used are measured by high performance liquid chromatography, which is different from the cut point of the elution chromatography used in the actual operation of the factory to the residual oil components, and the high performance liquid chromatography The operation is more complicated and the cost is high, so the applicability to the actual operation of the factory is poor; (2) Since the residual oil samples are mostly dark brown viscous or solid state, it is difficult to directly measure its ultraviolet spectrum, usually it is necessary to use some solvent to dissolve the residual oil. After the oil is dissolved, its ultraviolet absorption spectrum is measured, so the degree of dissolution of the residual oil sample will affect the measurement results; (3) the composition of various residual oils is quite different, and abnormal samples have a great influence on the accuracy of the established calibration model , thus affecting the accuracy of the measurement results

As reported in "Analytical Chemistry, 1998,26(5), 603", the method for measuring the freezing point of jet fuel was reported, and in "Analytical Chemistry, 1999,27(1), 34", the method for measuring aromatics content in diesel oil was reported, etc., but So far, there is no method for determining the content of residual oil components by combining near-infrared spectroscopy and chemometrics