Fractional Extraction Of High-Temperature Coal Tar And GC/MS Of The Extracts

The high-temperature coal tar (HTCT) produced by Xuzhou Coking Plant, Saint-Gobain Pipelines (Xuzhou) Co., Ltd. was primary extracted with acetone and petroleum ether, and the Petroleum ether extractable portion(PEEP)was separated by silica-gel column chromatography (SGCC) and solvent elution separation using petroleum ether(PE),95% petroleum ether and 5% ethyl acetate(EA) mixed solvents, 90% PE/10% EA,methanol as the eluant in turn. Quantitative collected each eluates and then detected by gas chromatography/mass spectrometry (GC/MS) to understand the effect of extraction times on the extract compositions and the difference in composition among the extracts obtained with different solvent. The results showed that several compounds which were more than others obviously were exist in each eluates. Such as Biphenylene,Phenanthrene,Anthracene,Fluoranthene,Benz[e]acephenanthrylene and Indeno[1,2,3-cd] pyrene in petroleum ether elution ; Phenol,2,6-dimethyl Phenol,2,3,6-trimethyl Phenol,Acridine,1-propynyl Benzene,Benzo[h]quinoline and Carbazole in 95%PE/5%EA;Azulene,1-methylene Indene,Phenanthridine,9-Anthracenecarbonitrile and 3-Aminopyrene in 90%PE/5%EA. The extract varieties and contents were decline with the increase of number of extraction. The detected components were largely eluted in the order of condensation extent.It's worth to note that the eluates with PE were concentration relatively and it can provided a well pretreatment method to further crystallization purifying and processing of the extracts. The contents of heteroatom-containing aromatics in PE/EA mixed solvent were more than that in PE obviously. Compared among the compounds obtained by four levels extraction, the contents and types in methanol extraction were far less than other solvent extraction, it was relative to the higher extraction efficiency of previous extraction.