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Method for automatically analyzing gasoline detailed hydrocarbon compositions by utilizing gas chromatography

A gas chromatography and automatic analysis technology, which is applied in the field of gas chromatographic analysis of gasoline monomer hydrocarbons, can solve problems such as analysis deviation, qualitative and quantitative deviation, and inability to guarantee correctness, and achieve the effect of reducing requirements and improving reliability and efficiency

Active Publication Date: 2010-11-03
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

The biggest problem with this method is that the extraction of characteristic components of unknown samples is obtained after the analysis of gasoline composition data is completed. It first selects a gasoline type as a general template, usually catalytic gasoline, and then proceeds to unknown samples on this basis. 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 straight-run gasoline, using the catalytic gasoline database for qualitative analysis will inevitably lead to a certain degree of qualitative and quantitative deviation. At this time, the 29 extracted characteristic components are used to judge the classification 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 detailed hydrocarbon compositions by utilizing gas chromatography
  • Method for automatically analyzing gasoline detailed hydrocarbon compositions by utilizing gas chromatography
  • Method for automatically analyzing gasoline detailed hydrocarbon compositions by utilizing gas chromatography

Examples

Experimental program
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Effect test

example 1

[0108] Extract characteristic data of standard straight-run gasoline samples.

[0109] The product of initial distillation ~ 200 ℃ after the crude oil was cut by the atmospheric and vacuum unit of the refinery was taken as the standard straight-run gasoline sample.

[0110] A sample of standard straight-run gasoline was subjected to gas chromatography analysis. According to the retention time of each component in the spectrum, extract C 5 ~C 10 The retention time of each n-alkane, benzene, toluene and o-xylene is used as the standard retention time, see Table 14.

[0111] Table 14

[0112] component name

example 2

[0114] (1) Set up and start the sample analysis sequence

[0115]On the chromatography workstation, set the storage path of the chromatographic raw analysis data as "c:\hpchem\1\data\pona" and the data file names of the three samples to be tested from "Gasoline1" to "Gasoline3". At the same time, start the method software, and specify the reading path of the original analysis data in the analysis software from "c:\hpchem\1\data\pona\Gasoline1" to "c:\hpchem\1\data\pona\Gasoline3". Set the original analysis data file as the data result file of "report.txt". After the chromatographic instrument conditions were stabilized, gasoline samples 1, 2, and 3 were analyzed by the instrument in an automated sequence. During the chromatographic operation, the analysis software searches the above-mentioned "c:\hpchem\1\data\pona\Gasoline1" for "report.txt" at a frequency of 10 seconds. After the analysis, the analysis software detects that there is a report. The .txt data file is generate...

example 3

[0139] In example 2, the data file name is "Gasoline2" for sample 2 to be tested. After the chromatographic analysis is completed, the analysis software automatically reads the data contained in the "report.txt" file under the path of c:\hpchem\1\data\pona\Gasoline2 , converted into a file in database format, calculate its characteristic value according to Table 2, see Table 21, and judge according to the characteristic value as follows: (1) The initial value of characteristic value 17 retention time is less than 18min, and the end value is greater than 73min, and it is judged as a full distillate oil (2) eigenvalue 1 judges that n-alkane is the largest peak in the set area, and possesses the characteristics of coker gasoline and straight-run gasoline; (3) judges according to features 2 and 3 that there are n-alkenes that appear in pairs with normal alkanes, It has the characteristics of coking gasoline. The above characteristic values ​​meet the conditions of coking gasoline,...

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Abstract

The invention relates to a method for automatically analyzing gasoline detailed hydrocarbon compositions by utilizing gas chromatography, comprising the following steps of: firstly, analyzing a tested gasoline sample by using the gas chromatography, and converting analysis original data output by the gas chromatography to a database file format which can be used for analyzing software in real time; secondly, searching a suspected characteristic value of the sample based on a retention time, and judging the type of the tested gasoline by comparing the suspected characteristic value with a set characteristic threshold value; thirdly, calculating a retention index of each composition through the retention time of a reference peak based on the type of the tested gasoline, and obtaining the detailed hydrocarbon compositions of the tested sample by comparing the retention index with a retention index in a standard qualitative database; and fourthly, in the retention index of each composition, obtained in the calculation, selecting the retention indexes of a characteristic composition and a fallibility composition, automatically searching the retention index of a corresponding composition in a table to be compared with the retention indexes of the characteristic composition and the fallibility composition, determining that the selected composition can be tested and is a peak with the biggest peak area to reconfirm the correctness of the detailed hydrocarbon compositions determined in the third step. The method does not need artificial interference and can obtain the detailed hydrocarbon compositions of the tested sample by automatically analyzing spectra data obtained through chromatographic analysis.

Description

technical field [0001] The invention relates to a method for analyzing the composition of gasoline monomer hydrocarbons by gas chromatography, specifically, a method for automatically analyzing the gasoline monomer hydrocarbon composition by analyzing software. Background technique [0002] The hydrocarbon composition data of gasoline fractions is an important indicator of gasoline products, and it is also an indispensable basic data for petroleum refining and petroleum processing. The advantages of gas chromatography in component separation make gas chromatography very suitable for the analysis and determination of complex mixtures such as gasoline, especially the analysis of monomer hydrocarbons using a non-polar high-resolution capillary column to determine the composition of gasoline. The instrument configuration is simple, the method is easy to operate, and the amount of information is large, and the composition information of hundreds of components can be obtained in o...

Claims

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Application Information

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IPC IPC(8): G01N30/02G06K9/00
Inventor 李长秀王亚敏杨海鹰
Owner CHINA PETROLEUM & CHEM CORP
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