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Method for measuring contents of components in oil residue

A residual oil, principal component technology, applied in the measurement of color/spectral characteristics, fuzzy logic-based systems, electrical components, etc., can solve the problems of high cost, complex operation of high performance liquid chromatography, and large differences in composition.

Inactive Publication Date: 2003-10-22
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology

This method has the following disadvantages: (1) the basic data is measured by high performance liquid chromatography, which is different from the cut point of the elution chromatography adopted in the actual operation of the factory to the residual oil components, and the operation of the high performance liquid chromatography is relatively Complex and costly, so poor applicability to actual factory operations
(2) Due to the large differences in the composition of various residual oils, abnormal samples have a great impact on the accuracy of the established calibration model, thereby affecting the accuracy of the measurement results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0086] These examples illustrate adopting the inventive method to the measuring process of the four component content of 30 unknown residual oil samples, and its result shows that the inventive method compares with conventional elution chromatography, and the absolute deviation of each component content is all less than 2 percentage points , which can meet the measurement requirements of residual oil component content.

[0087] 1. Determination of residual oil UV-visible absorption spectrum:

[0088] Weigh 16.0-17.0 mg of residual oil sample, dissolve it with 0.5 mL of dichloromethane, and then dilute to 250 mL with n-heptane to obtain a sample solution of a mixed solvent of dichloromethane and n-heptane with a concentration of about 0.06 mg / mL.

[0089] The mixed solvent of dichloromethane and n-heptane of 2‰ (volume ratio) is used as a reference sample, and the ultraviolet absorption spectrum is measured in the wavelength range of 190-700nm, and the thickness of the cuvette ...

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Abstract

A method for measuring the contents of components in oil residue features that an optical spectrum array is created with the ultraviolet-visual absorption spectra obtained by concentration normalization of representative oil residue specimens, they are clustered by fuzzy k-average value of the charncteristic variables that is the analyzed score of main component, the ultraviolet-visual absorption spectra of the correcting set composed of each oil residue types after clustered and the basic data measured by elution chromatography take part of regression analysis to create correct model, the main components of unknown oil residue is analyzed for its ultraviolet-visual absorption spectrum to determine its type, and the contents of its main components can be calculated by the correct model. Its avantages are high correctness and high speed.

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 ultraviolet-visible absorption 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 residua...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/33G06N7/02
Inventor 褚小立袁洪福陆婉珍
Owner CHINA PETROCHEMICAL CORP
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