Simultaneous extraction of water and combustible from high moisture coal using subcritical dimethyl ether

用亚临界二甲醚在-20 ~ 80℃的温度下，成功地从高水分褐煤中提取水分和可燃物。在每个温度下，通过水在亚临界二甲醚中的溶解度来确定提取水量。另一方面，提取的可燃物量为褐煤初始干重的5%。亚临界二甲醚萃取的可燃物部分可溶于己烷。萃取温度越高，可燃物的溶解量越大。亚临界二甲醚提取的可燃物在不同的温度下，其组分存在差异。在较高的萃取温度下，褐煤渣的自燃性降低。

We successfully extract water and combustible from high moisture lignite by subcritical dimethyl ether at from -20C to 80C. Extracted water amount was determined by solubilitiy of water in subcritical dimethyl ether, at each temperture.On the other hand, extracted combustible amount was 5 weight % of the initial dry weight of the lignite. A part of the combustible extracted by subcritical dimethyl ether was dissolvable in hexane. The dissolution amount of the combustible increases at higher extraction temperature. The compornents of the combustible extracted by subcritical dimethyl ether differ each other at the various temperature. Moreover, spontaneous combustibility of the lignite residue was decreased at higher extraction temperature.