石蜡基属催化裂化轻油浆化学结构随沸点变化规律研究

发布时间：2019-03-27 07:25

【摘要】：以石蜡基属催化裂化油浆——长庆油浆为研究对象,采用高真空釜式蒸馏按沸点将其切割成7个窄馏分,采用常规分析方法结合正离子甲酸铵电喷雾-傅里叶变换离子回旋质谱(ESI FT-ICR MS)、核磁共振氢谱(1 H-NMR)和红外光谱(FT-IR),得到长庆油浆窄馏分性质及结构随沸点变化的规律。结果表明,随馏分沸点升高,长庆油浆窄馏分的密度和折光率先增大后减小,氢/碳原子比先减小后增大,出现了与原油不一样的变化趋势,而其残炭、平均相对分子质量和运动黏度则逐渐增大。此外,以500℃为分界点,饱和分含量先减小后增大,芳香分先增大后减小。油浆窄馏分中含有相当数量的烷烃结构,芳碳率fA随馏分沸点升高先增大后减小,烷基碳率fP的变化趋势则相反。长庆油浆各窄馏分中主要含3~5环芳烃,低于500℃馏分,随馏分沸点上升,芳环数不断增加,缩合程度提高;500℃以上馏分的芳环保持在5个左右,出现环烷环数的增加和侧链的变长。
[Abstract]:The paraffin-based FCC slurry-Changqing slurry was cut into seven narrow fractions by high vacuum tank distillation at boiling point. Conventional analytical methods were combined with cationic ammonium formate electrospray Fourier transform ion cyclotron mass spectrometry (ESI FT-ICR MS), nuclear magnetic resonance hydrogen spectroscopy (1 H-NMR) and infrared spectroscopy (FT-IR). The variation of properties and structure of narrow fractions of Changqing slurry with boiling point was obtained. The results show that with the increase of boiling point, the density and refraction of narrow fractions of Changqing slurry increase at first and then decrease, and the ratio of hydrogen to carbon atom decreases first and then increases, and the change trend is different from that of crude oil, but the residual carbon of Changqing slurry is different from that of crude oil. The average relative molecular weight and kinematic viscosity increased gradually. In addition, when 500 鈩，

本文编号：2447988