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Working principle and application of gas chromatograph in olefin, aromatics and benzene in gasoline

Time:2018/10/13   Pageviews:0    Share:
This is an article about Working principle and application of gas chromatograph in olefin, aromatics and benzene in gasoline. If you are interested, please contact us!

Although China is a major oil producer and consumer, gc-ms vials the analysis of saturated hydrocarbons, olefins, aromatic hydrocarbons, and benzene and oxygenates in gasoline has been difficult. With the rapid development of science and technology and the rapid development of national economic construction, the content of olefins, aromatic hydrocarbons and benzene in gasoline has become an important quality indicator in gasoline specifications. Therefore, determining the volume fraction and mass fraction of saturated hydrocarbons, olefins, aromatics and benzene in gasoline provides an gc-ms vials important means for monitoring the process conditions of the refinery. It is very important to know the blending ratio of gasoline and understand the quality characteristics of different gasolines.

In order to adapt to the development and break the monopoly of foreign instrument manufacturers on the industry, Luchuang Analytical Instrument Co., Ltd. organizes analytical instrument industry experts and professors and senior engineers who have worked in the petrochemical industry for many years in GC-9860 gas chromatograph according to national standards and standards. Based on the secondary research, the GC-9860 (TZ) gas chromatograph gc-ms vials was specially developed for the analysis of hydrocarbon composition in gasoline. The performance of the instrument is stable, the analysis results are high precision, the operation is simple and easy to maintain, and the analysis time is shorter. Production control.

Scope of application:

It is suitable for the determination of saturated hydrocarbons, olefins, aromatic hydrocarbons and benzene in gasoline and petroleum fractions below 205 °C. It is not suitable for determining the content of monomer components in each hydrocarbon group except benzene. It can also meet the determination of oxygenates in gasoline after modification.

Content determination range:

5% to 65% (volume fraction) of olefin, 5% to 50% (volume fraction) of aromatic hydrocarbon, and 0.3% to 50% (volume fraction) of benzene

Effect of alcohols and ethers on the determination results:

For gasoline samples containing oxygenated components such as alcohols and ethers, the alcohols and ethers will peak with the particular hydrocarbon family and the results should be corrected.
Determination of olefin, aromatics and benzene in gasoline Gas chromatograph works:

The instrument utilizes the olefin adsorption traps dedicated to different polar columns to selectively retain gasoline samples in a family-selective manner, and analyzes the family composition of the samples through an appropriate column-and-valve connection process.

When the gasoline sample is vaporized and then enters the polar separation column through the electric ten-way valve, the aromatic hydrocarbon component is separated in the column from the saturated hydrocarbon and olefin components. When saturated hydrocarbons and olefins pass through the olefin adsorption trap, the olefin adsorption trap is in a low temperature adsorption state, the olefin component is selectively retained, and the saturated hydrocarbon passes through the olefin adsorption trap and enters the detector for detection; after the saturated hydrocarbon component flows out, it automatically Switching the ten-way valve to separate the olefin adsorption trap from the carrier gas flow path, at which time the adsorption trap temperature starts to rise to the desorption temperature, and the benzene in the aromatic hydrocarbon enters the detector after passing through the equilibrium column through the polar separation column; in order to shorten gc-ms vials the analysis time, The other aromatic components quickly peak, and then switch the ten-way valve, the polarity separation column is in a backflush state, and enters the detector through the equilibrium column; when the adsorption trap temperature reaches the set temperature, the ten-way valve is switched to make the olefin adsorption trap The backflushing state is connected to the carrier gas flow path, the olefin is desorbed and flows into the detector for detection, and the entire analysis process ends.

This is the end of the introduction of Working principle and application of gas chromatograph in olefin, aromatics and benzene in gasoline I hope it can help you.


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