Methods of extracting 1-4 cycle heterocyclic compounds and 2-5 cycle polynuclear aromatic hydrocarbons from a hydrocarbon feedstock are described. The methods include providing a hydrocarbon feedstock containing crude oil fractions, and determining an A/R ratio and an asphaltene concentration of the hydrocarbon feedstock. Based upon the A/R ratio and the asphaltene concentration, the treatable hydrocarbon feedstock undergoes one or more of cracking and fractionating. Subsequently, at least one targeted portion of the heterocyclic compounds is extracted from the fractionated stream with an aqueous solvent. A stream containing the 2-5 cycle polynuclear aromatic hydrocarbons is transferred to an extractor and the 2-5 cycle polynuclear aromatic hydrocarbons are extracted with a solvent system comprising an aprotic solvent.
                            本文介绍了从烃类原料中提取 1-4 周期
杂环化合物和 2-5 周期多核
芳烃的方法。这些方法包括提供含有原油馏分的碳氢化合物原料,并确定碳氢化合物原料的 A/R 比率和
沥青质浓度。根据 A/R 比率和
沥青质浓度,对可处理的碳氢化合物原料进行一种或多种裂解和分馏。随后,用
水性溶剂从分馏流中提取至少一种目标
杂环化合物。将含有 2-5 周期多核
芳烃的气流转移到萃取器中,并用包含烷基溶剂的溶剂系统萃取 2-5 周期多核
芳烃。