摘要
采用气相色谱/质谱（GC/MS）及气相色谱/场电离-飞行时间质谱（GC/FI-TOF MS）对加氢裂化全馏分产品进行表征分析,考察了全馏分产品的分子组成特点,并对其分子组成随反应深度的变化规律进行探讨。结果表明：全馏分产品中正构烷烃主要分布在C_18～C_40的较高碳数范围内;随转化深度的增加,异构烷烃含量大幅度增加,正构烷烃含量整体变化较小,原料中链烷烃的含量及组成直接影响尾油馏分产品BMCI值及低温流动性;在全馏分产品的环烷烃化合物中,C_5～C_13范围内一环环烷烃含量最高,侧链碳数大于7的一至三环环烷烃更易发生断侧链反应,趋向于转化为侧链碳数更低的环烷烃化合物;芳烃化合物主要分布在小于350℃馏分中,主要以烷基苯、茚满及萘满的形式存在,较少以无侧链取代苯的形式存在。
Gas chromatography/mass spectrometry （GC/MS） and gas chromatography/field ioniza- tion time of flight mass spectrometry （GC/FI-TOF MS） were used to analyze the molecular compositions of hydrocracking products. The composition properties of products and the changes of composition with conversion depth were investigated. The results show that the carbon number of normal paraffin is mainly between C_18 and C_40. With the conversion depth increasing, the iso-paraffin increases rapidly and the normal paraffin has little change. The contents and compositions of alkanes in the feedstocks have a significant influence on the BMCI value and cold-flow properties of the unconverted oil. The cyclo-paraf- fin hydrocarbon compounds in the whole distillate products, the mass fraction of monocycloalkane with the carbon number from C_5 to C_13 is the highest, compared with other cycloalkanes. One to three-ring cycloalkanes with carbon number of side-chain above 7 undergo an alkyl chain cracking and tend to be the cycloalkanes with lower side-chain carbon number. Aromatic hydrocarbons mainly distribute in the fractions below 350 ℃ with alkylbenzene, indane and tetralone as main configulations, but little com- pounds exist in the form of benzene.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2015年第4期103-109,共7页
Petroleum Processing and Petrochemicals
基金
国家重点基础研究发展计划"973"项目(2012CB224800)基金资助
关键词
加氢裂化
质谱
分子组成
转化深度
hydrocracking
mass spectrometry
molecular composition
conversion depth
