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渣油超临界萃取馏分中硫化物的分离富集研究
引用本文:周永昌,赵锁奇.渣油超临界萃取馏分中硫化物的分离富集研究[J].燃料化学学报,2005,33(3):304-308.
作者姓名:周永昌  赵锁奇
作者单位:The Faculty of Chemical Technology, Anhui University of Technology, Ma'anshan 243002, China; State Key Laboratory of Heavy Oil Processing, University of Petroleum of China ,
基金项目:安徽省高等学校青年教师科研资助计划项目(2004jql32)。~~
摘    要:采用选择性氧化与色谱结合的方法分离渣油中的硫醚硫化物和噻吩硫化物,该法是基于不同类型硫的选择性氧化、氧化组分与未氧化组分间极性的差异实现的。首先用高碘酸四丁铵在不氧化噻吩硫的情况下将硫醚硫选择性氧化为高极性的亚砜,经色谱柱分离富集后,利用红外色谱和硫元素分析仪,研究了馏分中硫化物的类型分布。结果表明,在俄罗斯渣油中噻吩硫和硫醚硫的质量分数随组分变重均呈增长趋势,噻吩硫相对质量分数(指硫醚硫+噻吩硫)随馏分变重呈下降趋势,相对质量分数在70%以上,噻吩硫是俄罗斯渣油中硫的主要存在形态。

关 键 词:渣油  硫化物  分离  富集  红外光谱  
文章编号:0253-2409(2005)03-0304-05
收稿时间:2004-11-09
修稿时间:2004年11月9日

Study on sulfur distribution in supercritical fluid extraction fraction of residua
ZHOU Yong-chang,ZHAO Suo-qi.Study on sulfur distribution in supercritical fluid extraction fraction of residua[J].Journal of Fuel Chemistry and Technology,2005,33(3):304-308.
Authors:ZHOU Yong-chang  ZHAO Suo-qi
Institution:ZHOU Yong-chang1,ZHAO Suo-qi2
Abstract:In order to reduce the sulfur content of the liquid transportation fuels from petroleum residua to low levels, it is very necessary to investigate the distribution of sulfur-containing compounds for the processes and desulfurization of residua. In the past, a number of methods have been reported for the isolation of sulfur compounds from petroleum based on distillation and/or mercuric chloride adduct formation. Most of these procedures are tedious and/or applicable only to the isolation of individual sulfur-containing compounds from petroleum and other fossil fuels. In this paper the crude oil from Russia was distillated to get the distillates and the atmospheric residua (AR) was further distillated under vacuum to get VGO fractions and vacuum residua (VR). The AR and VR were deeply cut into a number of fractions by supercritical fluid extraction and fraction (SFEF) respectively. A simple method used to determine the quantity and distribution of sulfur compounds in petroleum fractions was based on the ability to selectively oxidize the sulfur atom and large difference in polarity between the oxidized and non-oxidized forms. IR and element analysis were applied in the quantitative determination of sulfur species and their distributions. It is shown that the isolation of sulfide and thiophenic compounds from petroleum residua are obtained in a high yield and the sulfur is found in light, medium and heavy fraction of residua. The quantity of sulfides varies from 0.29% to 0.72% in fractions of VR and from 0.29% to 0.96% in those of AR; and the thiophenic compounds are from 1.19% to 1.50% in fractions of VR and from 0.67% to 1.43% in those of AR. The dominated sulfur type is thiophene in which the sulfur content is over 70% of total sulfur and the minority is sulfide. When fraction becomes heavier, the absolute sulfur contents in both forms will increase. However, the relative content of thiophenic sulfur decreases while that of sulfide increases.
Keywords:residue  sulfur compounds  separation  concentration  IR
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