不同来源催化裂化柴油馏分中烯烃的组成与分布特点

采用Ag-SiO2固相萃取法结合全二维气相色谱-飞行时间质谱（GC×GC-TOF MS）相对大庆、胜利、辽河、塔河四种催化裂化柴油馏分中烯烃的组成特点进行了分析。烯烃的类型和碳数分布结果表明：胜利、辽河和塔河催化裂化柴油均由单烯烃、环烯烃、双烯烃、三烯或环二烯组成，均呈现单峰分布特点；大庆催化裂化柴油烯烃含量较低，仅检测出单烯烃和环烯烃系列。四种柴油烯烃中以单烯烃含量为最高，可占总脂肪烯的50%以上，但是正构α烯烃含量却都低于5%，说明催化裂化柴油中主要以内烯烃和异构烯烃为主。烯烃的类型和分布与加工过程的反应机理有直接关系，通过分子组成分析，能为油品加工工艺机理的研究提供方法支持。

Composition and Distribution Characteristics of Olefin Fractions in Different FCC Diesels

Olefins were separated from four FCC diesels by Ag-SiO2 solid-phase extraction and characterized by comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry（GC×GC-TOF MS）. The molecular composition characteristics of different olefins were systematically investigated. The compound type and carbon number distribution results showed that olefin compounds including monoolefin, diolefin, cycloolefin, triolefin and cyclodiolefin were found in Shengli, Liaohe and Tahe FCC diesels, and presented unimodal distribution. Only monoolefin and cycloolefin were detected in Daqing FCC diesel. Monoolefin compounds occupied more than 50%（mass fraction）of the total olefin compounds in all four FCC diesels, while the normal α-olefin were just less than 5%. This indicated that internal olefin and isomeric olefin were dominant in FCC diesels. The olefin type and distribution were influenced by processing mechanism. Thus, more detailed knowledge about the catalytic cracking process could be achieved based on the analysis of olefin molecular compositions.