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Method for automatically analyzing gasoline composition by utilizing gas chromatography

A gas chromatography and automatic analysis technology, applied in the field of chromatographic analysis, can solve the problems of qualitative and quantitative deviation, analytical deviation, inability to guarantee correctness, etc., and achieve the effect of avoiding analysis errors

Active Publication Date: 2012-05-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The biggest problem with this method is that the extraction of the characteristic components of the unknown sample is obtained after the analysis of the gasoline composition data is completed. It first selects a gasoline type as a general template, usually catalytic gasoline, and on this basis the unknown sample is extracted. Analysis, after obtaining the composition data, then judge the type of the sample
In the actual sample analysis process, if the sample to be tested is a straight-run gasoline, qualitative analysis using the catalytic gasoline database will inevitably lead to a certain degree of qualitative and quantitative deviation. At this time, the 29 extracted characteristic components are used to classify the class. there is no guarantee of its correctness
Therefore, using a common template to test all samples is highly likely to lead to analytical bias due to misjudgment of gasoline type

Method used

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  • Method for automatically analyzing gasoline composition by utilizing gas chromatography
  • Method for automatically analyzing gasoline composition by utilizing gas chromatography
  • Method for automatically analyzing gasoline composition by utilizing gas chromatography

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058] Extract characteristic data for a standard straight-run gasoline sample.

[0059] The standard straight-run gasoline sample is taken from the initial distillation ~ 200°C product after the crude oil is cut by the atmospheric and vacuum unit of the refinery.

[0060] Carry out gas chromatographic analysis to the standard straight run gasoline sample, its spectrogram sees figure 1 . According to the retention time of each component in the spectrum, extract C 5 ~C 10 The retention times of normal alkanes, benzene, toluene and o-xylene are used as standard retention times, as shown in Table 4.

[0061] Table 4

[0062] component name Standard retention time, minutes c 5 11.941 c 6 18.384 c 7 29.304 c 8 41.614 c 9 52.980 c 10 63.246 benzene 23.605 toluene 36.192 O-xylene 51.044

example 2

[0064] Get unknown oil product RA-4 and carry out gas chromatography analysis, its spectrogram sees figure 2 According to the items shown in Table 1 of the present invention, search and extract suspected feature values, and the results are shown in Table 5.

[0065] table 5

[0066]

[0067]

[0068]

[0069] The suspected eigenvalues ​​in Table 5 were compared with the threshold values ​​for conditional judgment. The results are shown in Table 6. The listed suspected eigenvalues ​​meet the characteristic judgment conditions of catalytic gasoline, and the oil sample is catalytic gasoline.

[0070] Table 6

[0071]

example 3

[0073] The chromatographic analysis of the unknown oil sample 2006Gasoline was carried out, and the 17 suspected eigenvalues ​​shown in Table 1 were found in the chromatogram, and compared with the characteristic threshold values. The results are shown in Table 7. The suspected eigenvalues ​​listed in Table 7 meet the same conditions as pyrolysis gasoline, so it can be judged that 2006Gasoline is pyrolysis gasoline.

[0074] Table 7

[0075]

[0076] The spectral data of 2006Gasoline (retention time and peak area corresponding to each peak) was calculated by the aforementioned formula to calculate the retention index of each component, and compared with the qualitative database of pyrolysis gasoline one by one, the gasoline composition data obtained are shown in Table 8.

[0077] Table 8

[0078]

[0079]

[0080] C 12 + : 0.57%

[0081] Total peaks: 267

[0082] Sum of known peaks: 99.27

[0083] Unknown peak sum: 00.16

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Abstract

The invention relates to a method for automatically analyzing gasoline composition by utilizing a gas-phase chromatography. The method comprises the following steps: introducing a gasoline sample to be tested to a gas-phase chromatography for separating components and obtaining gas-phase chromatography data; searching a suspected eigenvalue of the sample according to retention time; comparing with an eigenvalue threshold to judge the type of the tested gasoline; and comparing the chromatography data with belonging standard databases one by one to confirm the composition of hydrocarbons corresponding to peaks in the chromatography. The method realizes the full automation from the gas-phase chromatography to the gasoline composition analysis, avoids analysis deviation caused by misjudge of personal chromatography recognition and has high accuracy rate of chromatography type recognition and high accuracy of gasoline composition analysis data.

Description

technical field [0001] The invention relates to a method for analyzing gasoline composition by gas chromatography, specifically, a chromatographic analysis method fully automatic from chromatographic analysis to gasoline composition. Background technique [0002] Gasoline composition analysis is one of the routine analysis items in the petrochemical field. Due to the complexity of gasoline composition, when single-column HP-PONA and GC / FID methods are used to analyze gasoline monomer hydrocarbons, limited by the peak capacity of the chromatographic column, mixed peaks cannot be avoided, and the resulting mixed peaks belong to the problem It has become the main source of error in existing monomeric hydrocarbon analysis methods. In order to reduce this disadvantage, the current qualitative method of gasoline composition is to first establish a corresponding standard qualitative database according to the distribution of hydrocarbons contained in different types of gasoline, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/86G01N35/00
Inventor 王亚敏李长秀杨海鹰
Owner CHINA PETROLEUM & CHEM CORP
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