神府大柳塔煤超临界萃取特性

SUPERCR IT ICAL EXTRACTION OF DAL IUTA COAL

以甲苯为溶剂采用非等温技术在半连续萃取装置上研究了神府大柳塔煤在超临界状态和亚临界状态下的萃取行为,考察了系统压力、溶剂流量和升温速率对萃取结果的影响。在所考察的范围内,压力、流量和升温速率的增大均可提高萃取物的生成速率。在液体采样时,以385℃为界对萃取物分别收集,再根据它们在甲苯中的溶解性,经过滤分为油+沥青烯和预沥青烯,并用FT-IR测定了其特征官能团的分布,且作了比较和分析。

Effects of experimental conditions on the extraction of Daliuta 2~# coal in Shenfu coalfield(DL_2) with toluene were investigated. Pressure, solvent flowrate and heating rate all have positive effects on extract formation rate(EFR), but work in different ways. Pressure and solvent flowrate enhance EFR by means of increasing the extracting efficiency of supercritical fluid, while the variation of EFR with heating rate is due to the enhanced pyrolysis of coal. The FT-IR spectra of oil+aspha-ltenes (toluene soluble) and preasphaltenes (toluene insoluble) obtained at 150～385℃ and 385～500℃ were measured and analyzed。