小龙潭褐煤加氢液化及其重质产物结构表征

Hydro-lique faction of Xiaolongtan lignite and structural characte rization of its heavy products

研究了小龙潭(XLT)褐煤直接加氢液化性能,并利用元素分析、红外光谱和荧光光谱法对液化重质产物沥青烯(AS)和前沥青烯(PA)结构进行了分析表征。结果表明,XLT褐煤液化活性高,Fe S催化415℃时液化转化率最高达到89.6%,其液化过程主要是煤大分子结构热解并脱氧。所得AS和PA的芳环结构单元类似于原煤,氧主要以羟基和芳香酮羰基形式存在。PA具有"列岛"(archipelago)式大分子结构特征,芳香结构含量明显大于AS。THF溶液中,PA缔合作用显著强于AS,尤其在稀溶液中PA存在一定的分子内缔合。较高温度下所得PA和AS中芳香结构含量高,缔合作用强。

The hydro-liquefaction properties of Xiaolongtan ( XLT) lignite were investigated, and structures of the heavy products, including asphaltene ( AS ) and preasphaltene ( PA ) were characterized by elemental analysis, FT-IR and fluorescence spectroscopy. The results indicate that XLT lignite shows high liquefaction reactivity, and its conversion catalyzed by FeS at 415 ℃ is 89. 6%. During hydro-liquefaction, the macro-molecule of coal are pyrolyzed and deoxygenized. The aromatic structure units in AS and PA are similar to those in the coal. Hydroxyl and carbonyl in the form of aromatic ketone are main oxygen containing groups in AS and PA. The relative content of aromatic structure of PA, dominant in the archipelago molecular architecture, is obviously higher than that of AS. In THF solvent, PA shows significantly stronger aggregation than AS, especially an intra-molecular aggregation observed in a dilute solution. The AS and PA produced at high liquefaction temperature contain more aromatic structure, and show stronger aggregation.