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Chromatographic method for flow switching analysis of benzene and toluene in motor gasoline

A technology of flow switching and gasoline for vehicles, which is applied in the field of gas chromatographic analysis, can solve the problems of difficult establishment and large dead volume of the valve switching system, and achieve the effects of easy establishment and operation, good precision, and good technical effects

Inactive Publication Date: 2011-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that when benzene and toluene in gasoline are analyzed in the existing chromatographic analysis technology, the traditional valve switching technology is adopted, the method is difficult to establish, the dead volume of the valve switching system is large, and the methanol and ethanol in the gasoline sample The problem of interfering with the determination of benzene and toluene provides a new gas chromatography analysis method for flow switching analysis of benzene and toluene in motor gasoline

Method used

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  • Chromatographic method for flow switching analysis of benzene and toluene in motor gasoline
  • Chromatographic method for flow switching analysis of benzene and toluene in motor gasoline
  • Chromatographic method for flow switching analysis of benzene and toluene in motor gasoline

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Embodiment 1

[0017] According to the flow chart in Figure 1, the standard sample containing benzene and toluene was analyzed, and the typical chromatographic analysis conditions are shown in Table 1. Among them, the standard sample 1 # ~7 # Draw a calibration curve, and then use standard sample 2 # and 5 # As the sample to be tested, benzene and toluene were quantitatively calculated from the calibration curve. The composition and analysis results of the standard samples are shown in Table 2.

[0018] Table 1 Typical chromatographic analysis conditions

[0019]

[0020] Table 2 standard sample analysis results

[0021]

[0022] The analytical data of table 2 shows that the correlation coefficient r of the calibration curve of benzene and toluene 2 They are 0.9994 and 0.9999 respectively, and the linear relationship is good. The relative error of the standard sample determination is between -6.06% and 3.20%.

Embodiment 2

[0024] According to the flow chart in Figure 1, analyze the 93# automotive unleaded gasoline sample A and 93# automotive ethanol gasoline sample B sold on the market, and compare the analysis results with the standard method SH / T 0713-2002. Typical chromatographic analysis conditions are shown in Table 3, and the chromatograms are shown in figure 2 , the results of quantitative analysis are shown in Table 4. The spiked sample (a certain concentration of benzene and toluene added to 93# unleaded gasoline sample A and 93# ethanol gasoline sample B) was analyzed, and the quantitative analysis results are shown in Table 4.

[0025] Table 3 typical chromatographic analysis conditions

[0026]

[0027] Table 4 Analysis results of actual gasoline samples

[0028]

[0029] The analysis data of table 4 illustrates that the quantitative analysis result of the analytical method of the present invention is consistent with the quantitative analysis result of standard method SH / T 0...

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Abstract

The invention relates to a chromatographic method for analyzing the content of benzene and toluene in gasoline for vehicles by flow switching. The dead volume of the valve switching system is large, and methanol and ethanol in gasoline samples interfere with the determination of benzene and toluene. In the present invention, the automotive gasoline sample is pre-separated by the chromatographic column (5), and benzene, internal standard butanone and toluene are cut to the chromatographic column (11) by the flow switching heart-cutting system (13) for further separation, and then separated by a hydrogen flame The ionization detector (10) detects and adopts the internal standard method to quantify; the remaining components flowing out on the chromatographic column (5) enter the technical scheme of the hydrogen flame ionization detector (1) detection through the damping column (2), which is very This problem is well solved, and it can be used in industrial production for chromatographic analysis of benzene and toluene content in unleaded gasoline samples for vehicles and ethanol gasoline samples for vehicles.

Description

technical field [0001] The invention relates to a gas chromatography analysis method for flow switching analysis of benzene and toluene content in motor gasoline. Background technique [0002] Benzene content in motor gasoline is an important quality control index. Because benzene and aromatics are potentially harmful to the human body and the environment, the national standard stipulates that the benzene content in motor gasoline must not be higher than 2.5% (volume fraction); the total amount of aromatics must not be higher than 40% (volume fraction). The current standard methods for determining the content of benzene and toluene in gasoline include the industry standard SH / T0713-2002 "Determination of Benzene and Toluene in Motor Gasoline and Aviation Gasoline by Gas Chromatography" and SH / T 0693-2000 "Determination of Aromatics in Gasoline" Method Gas Chromatography". [0003] The standard method of SH / T 0713-2002 "Determination of Benzene and Toluene in Motor Gasoline...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/60
Inventor 李继文李薇王川
Owner CHINA PETROLEUM & CHEM CORP
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