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兴隆煤分别用甲醇、四氢呋喃和吡啶溶胀处理后，再进行超临界甲苯萃取实验，以考察溶胀预处理对超临界萃取结果的影响。研究结果表明：煤经吡啶或四氢呋喃溶胀处理后，可以明显改善萃取过程转化率及轻组分油的收率；在考察的萃取温度范围（３４０～４００℃）内，吡啶溶胀煤与原煤相比，始终具有较高的萃取转化率和较低的气体产率；增大溶煤比和萃取压力有助于改善吡啶溶胀煤的超临界萃取效果。此外用ＦＴＩＲ和ＳＥＭ对溶胀前后煤的结构变化进行了研究。
Xinglong coal was treated with methanol, tetrahydrofuran and pyridine respectively. Then the supercritical extraction of toluene was conducted to investigate the effect of swelling pretreatment on the result of supercritical fluid extraction. The results show that the conversion of pyridine and tetrahydrofuran can significantly improve the conversion of the extraction process and the yield of the light fraction oil. In the investigated extraction temperature range (340 ~ 400 ℃) , And always has higher extraction conversion rate and lower gas yield. Increasing the ratio of dissolving coal and extracting pressure can help to improve the supercritical fluid extraction effect of pyridine swelling coal. In addition, the structure changes of coal before and after swelling were studied by FTIR and SEM.