A method for measuring six components of coal tar

Abstract

A method for determining the six components of coal tar, the dehydration and deslagging coal tar is added into a container, an extraction agent is added, and after heating and refluxing, it is left to settle in a dark place; the extraction phase and the raffinate phase are poured into a funnel for filtration, The filtrate was put into a distillation flask; the filter paper was placed in a Soxhlet extractor, and the filter paper was dried after extraction, and the residue on the filter paper was weighed; neutral alumina was added to the distillation flask, and after ultrasonic treatment and rotary evaporation , to obtain powdered alumina coated with the sample; add an eluent to the column, followed by neutral alumina and powdered alumina coated with the sample, and then eluted to obtain saturated, aromatic, and heteroatoms. Fractions, phenolic fractions, gums. By screening a large number of eluents with different polarities, selecting the optimized results, taking into account the separation effect and separation process, the present invention separates the coal tar into saturated fractions, aromatic fractions, heteroatom fractions, phenol fractions, colloids and asphaltenes Six components are convenient for in-depth analysis and refined processing and utilization of coal tar.

Description

technical field [0001] The invention relates to a method for measuring six components of coal tar, which belongs to the field of separation of coal tar components. Background technique [0002] Coal tar is a liquid product in coal chemical production processes such as coal coking, semi-coke production, coal gasification, and coal pyrolysis. value product. The composition of coal tar is complex and diverse, containing tens of thousands of organic compounds, but only more than 500 substances have been identified, and only more than 10 components have a content of more than 1%. Coal tar components can be roughly divided into four categories: saturated hydrocarbon compounds, aromatic compounds, phenolic compounds and other heteroatom compounds. [0003] However, how to accurately quantitatively analyze and identify the compounds in tar is very difficult for such a complex mixture of aromatic compounds with different functional groups and wide molecular weight distribution. Th...

AI Technical Summary

Problems solved by technology

This method optimizes the extraction process through many ingenious designs, and realizes the rapid and efficient separation of light and heavy components and impurities in coal tar. However, the extraction method does not remove coal tar components such as phenolic fractions and heteroatom fractions nicely separated

[0008] Chinese invention patent CN103937522B describes a method for separating phenolic compounds and nitrogen-containing compounds in coal tar. A complexing separation agent is added to coal tar for complexation reaction, and then the nitrogen-containing compounds are quickly separated by evaporation and stripping. And phenolic compound and renewable separation agent and solvent, complex separation agent contains metal chloride, phosphate and halogenated salt, metal chloride is preferably at least one in zinc chloride, tin protochloride, aluminum chloride The phosphate salt is preferably at least one of sodium phosphate, potassium phosphate, and ammonium phosphate, and the halogenated salt is preferably tris(2-carbonylethyl)phosphonium hydrochloride, betaine hydrochloride, tetrahydroxymethyl chloride At least one of phosphorus and (methoxymethyl) triphenylphosphorus chloride, the stripping agent is at least one of chloroform, dichloromethane, isopropyl ether, and ether, the process is simple and environmentally friendly , No phenol-containing wastewater, can realize rapid and simultaneous removal of phenolic compounds and nitrogen-containing compounds, good removal effect, solves the problem that the coal tar dephenolization process usually only separates phenolic compounds, but does not separate other components

[0009] To sum up, the composition of coal tar is complex, and it contains a variety of very valuable compounds that cannot be obtained by the petrochemical industry

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