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Primary extraction solvent taken from Xuzhou Saint-Gobain coking plant coal tar , coal tar so as acetone and petroleum ether , petroleum ether solubles (PEEP). Column chromatographic separation , - eluting with a solvent separation method in the column chromatography on silica gel , followed by a mixed solvent of petroleum ether and 95% petroleum ether / 5% ethyl acetate , 90 % petroleum ether / 10% ethyl acetate mixed solvent . , methanol as an elution solvent PEEP fractional extraction . Quantitatively collected under each level of the eluent, using gas chromatography / mass spectrometry (GC / MS) analysis of the extract . The impact of the effects of extraction times on the resulting extract , different solvent extraction extracts obtained difference . The results showed that almost all exist several content was significantly higher than the other compounds in each level of each eluate . Such as petroleum ether elution was biphenyl alkenyl , phenanthrene, anthracene , fluoranthene , benzofluoranthene , benzopyrene , and indene , and pyrene ; 95% petroleum ether / 5% ethyl acetate elution was phenol , 2 90 % petroleum ether / 5% ethyl acetate , 6 - dimethylphenol , and 2,3,6 - trimethyl phenol , acridine, 1 - phenyl - 1 - propyne, benzo- quinoline and carbazole ; elution the Austrian Central micrantha was , 1 - Asia ethylindene , phenanthridine , 9 - the cyanoanthracene and 3 - amino pyrene . Downward trend with increasing extraction times , the extract types at all levels and content , ingredients detected overall the condensation degree from low to high order of dissolution . It is worth noting that in the eluate of the petroleum ether , the collected eluate having a centralized . Can extract was further purified by crystallization and processed to provide a good pretreatment method . Petroleum ether / ethyl acetate mixed solvent , the extract of the hetero-atom content of the compound is to be significantly higher than a single solvent extraction of petroleum ether . The four extraction contrast , the type and content of the respective compounds of the methanol solvent eluate should be much lower than the other solvent extraction , which there is a relationship to the extraction with the first few levels of the higher extraction efficiency .
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