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Method of analyzing diesel oil hydrocarbon composition using solid phase extraction and mass chromatogrophy

A technology of mass spectrometry analysis and family composition, applied in the direction of analyzing materials, material separation, measuring devices, etc., can solve problems such as hazards, increase operating costs, inability to meet, etc., and achieve the effect of shortening analysis time, reducing dosage, and increasing speed

Active Publication Date: 2005-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

The operation process takes a lot of time. The extraction and separation process takes about 8 hours, and the solvent removal and constant weight weighing take about 8 hours. Therefore, it cannot meet the needs of the refinery for rapid analysis of oil composition.
In addition, the solvent used in the above method is relatively toxic, which not only increases the operating cost, but also causes certain harm to the human body.

Method used

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  • Method of analyzing diesel oil hydrocarbon composition using solid phase extraction and mass chromatogrophy
  • Method of analyzing diesel oil hydrocarbon composition using solid phase extraction and mass chromatogrophy
  • Method of analyzing diesel oil hydrocarbon composition using solid phase extraction and mass chromatogrophy

Examples

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example 1

[0038] The applicability of the internal standard method GC-FID of the present invention to determine the relative content of saturated hydrocarbons and aromatics in diesel samples was investigated.

[0039] Pack 1.6 grams of activated silica in a solid-phase extraction column with a column height of 60 mm and an inner diameter of 7.0 mm, and its specific surface area is 600 m 2 / g, the pores with a pore volume of 0.45 ml / g and a pore diameter of 290-330 nm accounted for 60% of the total pore volume.

[0040] According to the method of ASTM D2549, the saturated hydrocarbons and aromatics of the diesel sample were separated, and after constant weight weighing, they were prepared into 4 samples with different content of saturated hydrocarbons and aromatics, and 0.12 grams of prepared samples were dropped into the solid phase extraction column, and the samples were ready It is completely adsorbed by the stationary phase silica. Then add 2.0 milliliters of n-pentane to the solid-...

example 2

[0045] Different diesel oil samples were analyzed according to the method of Example 1, except that the diesel oil samples were dropped into the extraction column during solid phase extraction. The content of aromatics and saturated hydrocarbons determined by internal standard method GC-FID is shown in Table 3, and the composition of hydrocarbon groups determined by mass spectrometry is shown in Table 4, wherein the composition of hydrocarbon groups is calculated according to ASTM D2425 method. The time for each sample from extraction separation to complete analysis giving hydrocarbon group composition was 30 minutes.

[0046] In table 3, the internal standard method GC-FID used in the present invention measures the relative content of saturated hydrocarbons and aromatics in diesel oil compared with the ASTM D2549 method. In the 8 diesel samples analyzed, the difference is the largest 1.2%, which fully meets ASTM D2549 reproducibility requirements.

[0047] As can be seen fro...

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Abstract

The method for analyzing diesel hydrocarbon composition by using solid phase extraction and mass spectrography includes the following steps: using solid phase extraction process to separate saturated hydrocarbon and aromatic hydrocarbon in diesel sample, collecting all the saturated hydrocarbon solution and aromatic hydrocarbon solution, respectively adding equivalent internal standard material, then respectively sampling and making gas chromatography and mass spectrography; utilizing gas chromatomap of aromatic hydrocarbon and saturated hydrocarbon to calculate relative content of both them, and utilizing mass spectrogram to obtain hydrocarbon composition of aromatic hydrocarbon and saturated hydrocarbon; according to the relative content of saturated hydrocarbon and aromatic hydrocarbon using normalization-calculation method to obtain the hydrocarbon composition of diesel.

Description

technical field [0001] The invention is a method for analyzing the hydrocarbon group composition of diesel oil through mass spectrometry, specifically, a method for analyzing the hydrocarbon group composition of diesel oil by using solid phase extraction and mass spectrometry. Background technique [0002] With the gradual strengthening of people's awareness of environmental protection and the continuous improvement of the requirements for clean fuel for vehicles. In the newly released "World Fuel Oil Specification", three different quality categories are stipulated for gasoline and diesel oil, and the content of total aromatic hydrocarbons and polycyclic aromatic hydrocarbons in diesel oil for vehicles is strictly limited. In my country's newly revised national standards for the quality of light diesel oil, the content of aromatic hydrocarbons and polycyclic aromatic hydrocarbons (more than two rings) should be further limited. [0003] Accurate determination of the conten...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/68G01N30/72
Inventor 刘泽龙樊雪志李云龙高红陈晓
Owner CHINA PETROLEUM & CHEM CORP
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