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A method for analyzing petroleum asphaltene components

A technology of petroleum asphalt and analysis method, which is applied in the direction of analyzing materials, material separation, measuring devices, etc. It can solve problems such as the analysis of asphaltene components that have not yet been seen, and achieve the effects of saving manpower and material resources, good data repeatability, and simple operation

Inactive Publication Date: 2017-01-11
中国石油天然气股份有限公司广西石化分公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Further analysis of the asphaltene components of different crude oil and residue raw materials has not been seen to determine the relative proportion of difficult-to-crack components in asphaltenes to guide oil refining and processing

Method used

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  • A method for analyzing petroleum asphaltene components
  • A method for analyzing petroleum asphaltene components
  • A method for analyzing petroleum asphaltene components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The main steps of the analytical method embodiment 1 of this petroleum asphaltenes component are as follows:

[0037] Ⅰ. Sample solution preparation

[0038] Prepare asphaltene samples first. Take 1 g of crude oil 1 as a sample, stir thoroughly with 50 mL of n-heptane to dissolve the soluble matter, filter with filter paper, and collect the solid filtrate. Repeatedly washing with 30 mL of n-heptane and filtering for 2 to 4 times, and finally the obtained solid filtrate was vacuum-dried to be the asphaltene sample of the sample liquid prepared in step I.

[0039] Take 10 mg of the obtained asphaltene sample, dissolve it in 1 mL of chloroform (CHCl 3 ), prepared into a 10mg / mL solution as the sample solution;

[0040] Ⅱ. TLC analysis

[0041] A rod thin-layer flame ionization analyzer is used, equipped with a chromatographic rod, a constant humidity cylinder and a chromatography cylinder device. The relative humidity of the constant humidity cylinder is 65% ± 2%, and ...

Embodiment 2

[0056] The main steps of the analytical method embodiment 2 of this petroleum asphaltenes component are similar to embodiment 1, and difference is as follows:

[0057] Step I sample liquid preparation, take 1 g of crude oil 2 as a sample, take 1 mg of the obtained asphaltene sample, dissolve it in 0.1 mL of chloroform, and prepare the sample liquid;

[0058] In step Ⅱ-1, extract 0.5 μL of the sample solution obtained in step Ⅰ with a micro-syringe, divide it into 4 times, and place it on the sampling end of the chromatographic rod; the point where the sample is applied is 0.4 cm away from the end of the chromatographic rod.

[0059] In step Ⅱ-2, the chromatographic rod is placed in a constant humidity cylinder for 9 minutes. The volume ratio of dichloromethane and n-heptane in the first solvent is 1:4. After the first solvent rises to 8cm in the chromatographic rod, take out the chromatographic rod. Leave for 2 minutes.

[0060] Step Ⅱ-3. Put the medium chromatographic stick ...

Embodiment 3

[0064] The main steps of the analytical method embodiment 3 of this petroleum asphaltenes component are similar to embodiment 1, and difference is as follows:

[0065] Its step I sample liquid preparation, take 1 g of crude oil 3 as a sample, take 5 mg of the obtained asphaltene sample, dissolve it in 0.5 mL of chloroform, and prepare the sample liquid;

[0066] In step II-1, extract 1 μL of the sample solution obtained in step I with a micro-syringe, divide it into 6 times, and place it on the sampling end of the chromatographic rod; the point where the sample is applied is 0.6 cm away from the end of the chromatographic rod.

[0067] In step Ⅱ-2, the chromatographic rod is placed in a constant humidity cylinder for 11 minutes. The volume ratio of dichloromethane and n-heptane in the first solvent is 1:3. After the first solvent rises to 11cm in the chromatographic rod, take out the chromatographic rod. Leave for 3 minutes.

[0068] Step Ⅱ-3. Place the medium chromatographic...

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Abstract

The invention provides a petroleum asphaltene component analysis method. Asphaltene is dissolved in trichloromethane to prepare a sample solution; a rod thin-layer flame ionization analyzer is adopted for detection, and 4 absorption peaks on a chromatography respectively correspond to 4 components of the asphaltene; the content proportions of the components corresponding to the areas of the absorption peaks are calculated, and the splitting difficulty degree value F of the asphaltene is calculated, wherein the F = (the content of the component 3 + the content of the component 4) / (the content of the component 1 + the content of the component 2). The F represents the difficulty degree of the asphaltene during splitting reaction. When three-time chromatographic analysis is performed, a first solvent is prepared by mixing dichloromethane and normal heptanes, and a second solvent is pure dichloromethane. A third solvent is prepared by mixing dichloromethane and methyl alcohol. By means of the analysis method, judgment whether raw oil meets the requirements for feeding and follow-up processing and design of a residual oil hydrogen desulfurization device or not can be performed according to the difficulty degree value F so as to adjust different raw oil proportions for feeding and ensure normal long-period operation of equipment. The petroleum asphaltene component analysis method is simple in operation, accurate in result, does not need purification and enables manpower and material resources to be saved.

Description

technical field [0001] The invention relates to petroleum refining and processing technology, in particular to a method for analyzing petroleum asphaltene components. Background technique [0002] Petroleum asphalt is a complex mixture composed of various complex polymer hydrocarbons and their non-metallic derivatives. It is generally divided into three basic components: mineral oil (oil), resin (colloid) and asphaltenes. [0003] Asphaltene is a substance that is insoluble in molecular (C5-C7) n-alkanes in petroleum, but soluble in hot benzene. middle molecule The largest and most polar non-hydrocarbon component. Asphaltene is solid amorphous, dark brown or black, with a relative density slightly greater than 1. It does not melt when heated above 300°C, and only decomposes into gas and coke without any fraction available. Asphaltenes are concentrated in vacuum residues. [0004] Hydrodesulfurization of residual oil is a key step in the refining process. Vacuum residual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/90
Inventor 郑晓曦金二芸张磊曹晶张建国韩兰生田文君胡于中平海宏周雪山
Owner 中国石油天然气股份有限公司广西石化分公司