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Method for measuring four components of coal tar

A coal tar, four-component technology, applied in the direction of measurement device, material separation, analysis of materials, etc., can solve the problems of experimental result error, can not be eluted, achieve sufficient extraction, be conducive to accurate measurement, and increase the contact area Effect

Active Publication Date: 2017-10-20
NORTHWEST UNIV(CN)
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  • Abstract
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  • Claims
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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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  • Method for measuring four components of coal tar
  • Method for measuring four components of coal tar
  • Method for measuring four components of coal tar

Examples

Experimental program
Comparison scheme
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

The invention discloses a method for measuring four components of coal tar, and an existing method is improved, and dose of an eluent when an improved chromatographic column is adopted for column passing is increased, so that each component can be eluted more completely. The method comprises the following steps: adding an n-heptane insoluble substance into a funnel with pre-treated quantitative filter paper to filter, leaching by use of n-heptane for many times, and separating saturated components, aromatic components and colloids in the n-heptane insoluble substance from asphaltene completely; n-heptane soluble substance is uniformly wrapped onto neutral aluminum oxide through a rotary evaporator, so that contact area between the eluent and the n-heptane soluble substance during column chromatography is increased, and therefore, elution is more complete. Heating refluxing in the industrial standards is changed into Soxhlet extraction, so that a component sample is sufficiently collected and separated; compared with heating refluxing in the industrial standards, Soxhlet extraction can leach the sample and also can soak the sample, so that extraction is more complete, and accurate measuring of the four components of the coal tar is facilitated.

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 Applications(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(CN)
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