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Aromatic hydrocarbon purification method suitable for analyzing specific carbon isotope

A purification method and isotope technology, applied in the field of purification of aromatic hydrocarbons without substituents, can solve problems such as poor controllability and difficulty in distinguishing boundary points between components, and achieve the effects of low cost, easy implementation, and reliable data

Inactive Publication Date: 2017-05-31
LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the similar chemical properties of most aromatics, it is difficult to distinguish the boundary point between the components, and the separation effect is easily affected by the activity of the filler, the concentration of the sample, and the polarity of the eluent, and the controllability is poor.

Method used

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  • Aromatic hydrocarbon purification method suitable for analyzing specific carbon isotope
  • Aromatic hydrocarbon purification method suitable for analyzing specific carbon isotope
  • Aromatic hydrocarbon purification method suitable for analyzing specific carbon isotope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 A method for purifying aromatics suitable for monomer carbon isotope analysis, comprising the following steps:

[0032] (1) Add 0.1g of crude oil into the cleaned glass tube, then replace it with helium three times to remove the air, then vacuumize and seal;

[0033] (2) Place the glass tube containing the crude oil in step (1) in a muffle furnace, and heat at 500°C for 48 hours to obtain a pyrolysis product;

[0034] (3) After the pyrolysis product was cooled to room temperature, it was extracted twice with dichloromethane at 30°C, the frequency was 15 kHz, and the time was 20 min, and combined to obtain the extract;

[0035] (4) The extract was distilled under reduced pressure for 3~5min at a temperature of 30°C and a pressure of 0.04MPa until 1~2mL of solvent remained, and then the asphaltenes were precipitated with n-hexane, and then the aromatic components were analyzed directly (GC-MS) and Monomer carbon isotope test (GC-IRMS) is sufficient.

[0036] A...

Embodiment 2

[0038] Example 2 A method for purifying aromatics suitable for monomer carbon isotope analysis, comprising the following steps:

[0039] (1) Add 0.2g of crude oil into the cleaned glass tube, then replace it with helium three times to remove the air, then vacuumize and seal;

[0040] (2) Place the glass tube containing crude oil in step (1) in a muffle furnace, and heat at 550°C for 12 hours to obtain a pyrolysis product;

[0041] (3) After the pyrolysis product was cooled to room temperature, it was ultrasonically extracted 4 times with dichloromethane at 33°C, the frequency was 25 kHz, and the time was 30 min, and the combined extract was obtained;

[0042] (4) The extract was distilled under reduced pressure for 3~5min at a temperature of 33°C and a pressure of 0.06MPa until 1~2mL of solvent remained, and then the asphaltenes were precipitated with n-hexane, and the aromatic components were analyzed directly (GC-MS) and Monomer carbon isotope test (GC-IRMS) is sufficient. ...

Embodiment 3

[0043] Example 3 A method for purifying aromatics suitable for monomer carbon isotope analysis, comprising the following steps:

[0044] (1) Add 0.15g of crude oil into the cleaned glass tube, then replace it with helium three times to remove the air, then vacuumize and seal;

[0045] (2) Place the glass tube containing the crude oil in step (1) in a muffle furnace and heat at 515°C for 24 hours to obtain a pyrolysis product;

[0046] (3) After the pyrolysis product was cooled to room temperature, it was ultrasonically extracted three times with dichloromethane at 32 °C, the frequency was 20 kHz, and the time was 24 min, and the combined extract was obtained;

[0047] (4) The extract solution was distilled under reduced pressure for 3~5min at a temperature of 32°C and a pressure of 0.05MPa until 1~2mL of the solvent remained. Monomer carbon isotope test (GC-IRMS) is sufficient. Test condition is the same as embodiment 1.

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Abstract

The invention relates to an aromatic hydrocarbon purification method suitable for analyzing a specific carbon isotope. The method comprises the following steps: (1) adding crude oil into a clean glass tube, removing air in the glass tube by virtue of helium replacement, vacuumizing, and sealing; (2) heating the glass tube filled with the crude oil in step (1) in a muffle furnace to obtain pyrolysis products; (3) cooling the pyrolysis products to a room temperature, ultrasonically extracting for 2 to 4 times by using dichloromethane, and merging to obtain extract liquid; and (4) concentrating the extract liquid, precipitating asphaltene by using n-hexane after the concentration of the extract liquid, directly analyzing components of the aromatic hydrocarbon (GC-MS) and testing the specific carbon isotope (GC-IRMS). The aromatic hydrocarbon purification method is low in cost, easy to implement, wide in application range, and capable of providing an effective technical means for the comparison of an oil source consisting of substituent-free aromatic hydrocarbon specific carbon isotopes in a deep oil-gas zone.

Description

technical field [0001] The invention relates to an aromatic hydrocarbon purification method, in particular to a substituent-free aromatic hydrocarbon purification method suitable for monomer carbon isotope analysis. Background technique [0002] With the rapid economic and social development and increasing energy consumption, oil and gas exploration has gradually extended to the deep layers of oil and gas basins (Zhu Guangyou et al., 2006; Zhang Shuichang et al., 2007). However, deep oil and gas exploration and development have encountered unprecedented difficulties, one of which is oil-source correlation (Jin Zhijun et al., 2007; Huang et al., 2016). Because the source rocks and crude oil in these formations are mostly in the high-over-mature stage, the distribution of conventional biomarkers (isoprenoid alkanes, steteranes, etc.) tends to be consistent, and loses the function of indicating the original source characteristics (Peters et al. al., 1993; Wu Heyong et al., 200...

Claims

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Application Information

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IPC IPC(8): G01N30/12G01N30/02
CPCG01N30/12G01N30/02G01N2030/125
Inventor 陈永欣夏燕青李康宁常江
Owner LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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