Gas chromatography system and method for detecting detailed composition of automotive gasoline

A technology for detecting cars and gasoline, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as large deviations in quantitative results, and achieve the effect of compact system structure

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Industry standard SH / T 0714-2002 "Determination of Monomer Hydrocarbon Composition in Naphtha (Capillary Gas Chromatography)" uses a 50m long non-polar capillary column to determine monomeric hydrocarbons in naphtha without olefins The composition has been widely used, but a single high-resolution capillary column is used for the analysis of finished motor gasoline. When certain oxygenated compounds or unconventional added components are added to the finished gasoline, the overlap with hydrocarbons makes quantitative The results have a large deviation

Method used

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  • Gas chromatography system and method for detecting detailed composition of automotive gasoline
  • Gas chromatography system and method for detecting detailed composition of automotive gasoline
  • Gas chromatography system and method for detecting detailed composition of automotive gasoline

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specific Embodiment approach

[0051] According to a specific embodiment of the present invention, the method may also include: according to the retention time or retention index of the chromatographic peak in the first chromatogram, compare it with the retention time or retention index of the components in the known database, identify The chromatographic peak in the first chromatogram, that is, to qualitatively identify the chromatographic peak and determine the difficult-to-separate components in the gasoline sample to be tested.

[0052] Exemplarily, in the first chromatogram, according to the chromatographic retention time or retention index, compared with the known qualitative database, 2,3,3-trimethylpentane and toluene have the same retention time, and the two are co-eluting Difficult to separate components.

[0053] According to one embodiment of the present invention, within a preset period of time, the target difficult-to-separate components in the continuous effluent components are sequentially e...

Embodiment approach

[0055] According to an embodiment of the present invention, the method may include: determining a preset time period. For example, a standard sample containing difficult-to-separate components is used to determine the preset time period.

[0056] Exemplary embodiment: prepare the alkane solution containing the target difficult-to-separate component as a standard sample, or take the actual typical gasoline sample containing the target difficult-to-separate component as the standard sample, and make the standard sample flow into the second nonpolar column, damping The column and the second detector are used to obtain the second chromatogram; the preset time period is determined according to the second chromatogram; wherein, the chromatographic column resistance of the damping column is equal to the chromatographic resistance of the polar chromatographic column.

[0057] In a further embodiment, the standard sample can also contain a reference substance, which is a component that...

Embodiment 1

[0077] The structure of the present embodiment gas chromatograph system is as follows:

[0078] Such as figure 1 As shown, the first detection channel 20 comprises a first sample inlet 1, a first non-polar chromatographic column 2 (the HP-PONA chromatographic column of Agilent Company, the stationary phase is 100% methylpolysiloxane, and the column length is 50m , inner diameter of 0.20mm), hydrogen flame ionization detector. The inlet of the first non-polar chromatographic column 2 communicates with the first sample inlet 1, and the outlet of the first non-polar chromatographic column 2 communicates with the inlet of the first hydrogen flame ionization detector.

[0079] The second detection channel 21 comprises a second sample inlet 5, a second non-polar chromatographic column 8 (the HP-PONA chromatographic column of Agilent Corporation, the stationary phase is 100% methyl polysiloxane, the column length is 50m, and the inner diameter is 0.20mm), center cutting assembly 19...

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Abstract

The invention relates to a gas chromatography system and method for detecting detailed composition of vehicle gasoline. The system comprises a first detection channel and a second detection channel, the first detection channel comprises a first sample inlet, a first non-polar chromatographic column and a first detector; the first sample inlet is communicated with an inlet of the first non-polar chromatographic column, and an outlet of the first non-polar chromatographic column is communicated with an inlet of the first detector; the second detection channel comprises a second sample inlet, a second non-polar chromatographic column, a central cutting assembly, a third sub-channel and a fourth sub-channel; the third sub-channel comprises a damping column and a second detector which are communicated in sequence, and the fourth sub-channel comprises a polar chromatographic column and a third detector which are communicated in sequence. The system disclosed by the invention is compact in structure and can be used for measuring the detailed hydrocarbon composition and the content of added components of the automotive gasoline.

Description

technical field [0001] The invention relates to a gas chromatography system and method for detecting the detailed composition of motor gasoline. Background technique [0002] Motor gasoline is blended from gasoline with different blending components according to a certain blending ratio. At the same time, in order to meet the requirements of the national gasoline standard, a certain amount of oxygen-containing compounds such as methyl tert-butyl ether will be added to ensure The octane number of gasoline. At the same time, the national gasoline quality standard also stipulates that unconventional additives such as methylal, sec-butyl acetate, aniline, and N-methylaniline must not be artificially added. Due to the complex types of gasoline blending components and the addition of various additives, the blending schemes are diverse. The determination of the composition information at the molecular level of motor gasoline can provide basic data for the optimization of blending...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/62G01N30/86
CPCG01N30/02G01N30/62G01N30/8634G01N2030/626
Inventor 李长秀王亚敏
Owner CHINA PETROLEUM & CHEM CORP
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