A process shown in Figure 2 in which a heavy oil feedstock is contacted with a non-polarsolvent and a polarsolvent to create a two-phase mixture. The polar solvent extract containing low molecular weight polars is separated. The remaining phase is cooled to produce a three-phase mixture which is separated into an asphaltene phase, a non-polar raffinate containing saturates and aromatics and a final extract containing the remaining low molecular weight polars.
图 2 所示的一种工艺,将重油原料与非极性溶剂和极性溶剂接触,生成两相混合物。含有低分子量极性物质的极性溶剂萃取物被分离出来。剩余相冷却后生成三相混合物,分离成
沥青相、含有饱和物和
芳烃的非极性馏分以及含有剩余低分子量极性物的最终萃取物。