质谱技术研究加氢裂化尾油链烷烃结构组成  

STUDY ON HYDROCARBON COMPOSITIONS OF PARAFFIN IN HYDROCRACKING TAIL OIL BY MASS SPECTROMETRY

作　　者：王乃鑫[1] 刘泽龙[1] 祝馨怡[1] 田松柏[1] 

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油炼制与化工》2014年第5期94-100,共7页Petroleum Processing and Petrochemicals

摘　　要：利用气相色谱-质谱(GC-MS)联用技术,在瓦斯油中饱和烃馏分的烃类测定方法 (SH/T 0659)的基础上,建立了测定加氢裂化尾油中正、异构链烷烃总含量及正构链烷烃碳数分布的分析方法,再根据气相色谱-场电离高分辨飞行时间质谱(GC-FI TOFMS)得到样品的链烷烃碳数分布,进而得到异构链烷烃的碳数分布。该技术与现有的烃类组成测定方法相比,能够提供更详细的链烷烃分子组成信息。利用所建方法对转化深度不同的3种加氢裂化尾油进行了分析,研究了转化深度对其链烷烃结构的影响,结果表明:随转化程度的加深,加氢裂化尾油中正、异构链烷烃含量均升高,总链烷烃含量增加,正构链烷烃占总链烷烃的比例下降;3种加氢裂化尾油的正构烷烃、异构烷烃以及总链烷烃的碳数均呈正态分布;高转化率时加氢裂化尾油含低碳数正、异构链烷烃较多,而中低转化率时含高碳数正、异构链烷烃较多。Based on the SH/T 0659method for analyzing saturate distillate in VGO GC-MS technique,a new method was established to measure the total content of normal paraffin,iso-paraffin,and the carbon number distribution of normal paraffin in hydrocracking tail oil.The GC-field ionization timeof-flight high-resolution mass spectrometry(GC-FI TOFMS)was used to calculate the carbon number distribution of the sample and then the carbon number distribution of iso-paraffin.Three hydrocracking tail oil samples at different conversion levels were studied by the new method to investigate the impact of conversion depth on the paraffin structure.The results show that normal and iso-paraffin and total paraffin content are increased with the degree of conversion,while the ratio of normal one in total paraffin decreases.The carbon numbers of normal and iso-paraffin as well as of total paraffin are normally distributed.At higher conversion level,more low carbon normal and iso-paraffin is in the tail oil,while high carbon paraffin becomes more at lower level.

关 键 词：气相色谱-质谱 气相色谱-场电离高分辨飞行时间质谱 正构链烷烃 异构链烷烃 加氢裂化尾油 碳数分布 

分 类 号：TE626.9[石油与天然气工程—油气加工工程] O657.63[理学—分析化学]