A method for measuring four components of coal tar

A coal tar and four-component technology, which is applied in the direction of measuring devices, material separation, and analysis of materials, can solve problems such as inability to elute out and errors in experimental results, achieve sufficient extraction, increase contact area, and facilitate accurate measurement Effect

Active Publication Date: 2020-03-10
NORTHWEST UNIV
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Problems solved by technology

When measured according to the four-component determination method of petroleum asphalt, a certain amount of eluent cannot completely elute the components that should be eluted, resulting in large errors in the experimental results

Method used

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  • A method for measuring four components of coal tar
  • A method for measuring four components of coal tar
  • A method for measuring four components of coal tar

Examples

Experimental program
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Effect test

Embodiment 1

[0067] 1) Weigh 5g of medium-low temperature coal tar heavy oil (sample 2) into a 500mL No. 1 round bottom flask, then add 250mL of n-heptane, heat to reflux for 1-4h, and then let it settle in a dark place for 1-4h.

[0068] 2) The quantitative filter paper is pretreated, specifically: soak the quantitative filter paper with n-heptane and toluene for 12 hours, and dry it for 12 hours for later use.

[0069] Pour the supernatant in the No. 1 round-bottom flask into a funnel equipped with pretreated quantitative filter paper and filter to obtain the filtrate. The residue in the No. 1 round-bottom flask was ultrasonically extracted several times with 80 mL of n-heptane, and then poured Put it into a funnel equipped with pretreated quantitative filter paper to obtain the washing liquid; collect the filtrate and washing liquid in No. 2 round bottom flask. Fold the filter paper with the residue and put it into the Soxhlet extractor, connect the No. 2 round-bottomed flask with the S...

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Abstract

A method for measuring the four components of coal tar. By improving the existing method and using an improved chromatography column to increase the amount of eluent when passing through the column, each component can be eluted more completely. Add the n-heptane insoluble matter to a funnel equipped with pre-treated quantitative filter paper and filter it. Use n-heptane to rinse multiple times to fully combine the saturated components, aromatic components and colloid contained in the n-heptane insoluble matter with Asphaltene separation. A rotary evaporator is used to evenly coat the n-heptane soluble matter on the neutral alumina, which increases the contact area between the eluent and the n-heptane soluble matter in the column, allowing for more complete elution. Change the heated reflux in the industry standard to Soxhlet extraction to fully collect the separated component samples. Compared with the heated reflux in the industry standard, Soxhlet extraction can not only rinse the sample but also soak it, making the extraction more complete and beneficial to coal tar. Accurate determination of four components.

Description

technical field [0001] The invention belongs to the field of separation of coal tar components, in particular to a method for measuring four components of coal tar. Background technique [0002] Coal tar generally refers to the liquid product obtained during carbonization or pyrolysis of coal. Depending on the carbonization temperature, different high-, high-, and low-temperature coal tars can be obtained, such as: low-temperature coal tar, medium-temperature coal tar, medium-low temperature coal tar, and high-temperature coal tar. Coal tar is a very complex organic mixture containing tens of thousands of compounds, of which only about 500 have been identified so far. Although the discovery of coal tar has a history of more than 300 years, due to the complexity of coal tar components, many components are still not very clear. Therefore, accurate analysis of coal tar components is of great significance for industrial processing and utilization. [0003] Coal tar is a very ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/12G01N30/14
CPCG01N30/02G01N30/06G01N30/12G01N30/14G01N2030/062G01N2030/126
Inventor 孙鸣唐星冯新娟何超张丹马晓迅徐龙郝青青
Owner NORTHWEST UNIV
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