ICP-OES直接测定焦化馏分油中的硅含量  

DIRECT DETERMINATION OF SILICON CONTENT IN COKER DISTILLATES BY ICP-OES

作　　者：王杰明[1] 杨德凤[1] 吴梅[1] 史军歌[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》2015年第11期91-95,共5页Petroleum Processing and Petrochemicals

摘　　要：建立了在线内标有机进样-电感耦合等离子体发射光谱法(ICP-OES)测定焦化馏分油中硅含量的分析方法。采用该方法考察了12种不同形态的有机硅化合物在ICP-OES上的响应灵敏度,其中三甲基硅醇、三乙基硅烷、二甲氧基二甲基硅烷、六甲基二硅醚的响应值较高,检测值与理论值(约2μg/g)的比值分别为5.0,3.4,4.2,4.1,但是在实际焦化馏分油中这些组分的含量非常低,因此基本不会影响硅的定量分析结果。实际焦化馏分油中的有机硅主要为环硅氧烷,而这类物质在ICP-OES上的响应灵敏度基本相同,因此认为ICPOES可以用于焦化馏分油中硅含量的定量分析。该方法对焦化汽油和焦化柴油的加标回收率分别为101%和98.4%,检出限为0.03μg/g。The on-line internal standard with direct introduction of organic solvent method was established for the determination of silicon in coker distillates by inductively coupled plasma optical emission spectrometry （ICP-OES）. The effect of twelve different silicon organic compounds on the response sensibility was tested. Among of them, the trimethylsilanol, triethylsilane, dimethoxydimethylsilane and hexamethyldisiloxane show higher sensibility than other eight compounds, and the ratios of measured and theoretical value （about 2 gg/g） are 5.0, 3.4, 4.2 and 4.1, respectively. However, these four compounds have little effect on the determination of silicon in real coker distillates due to very low concentrations. The ring siloxanes are the main organic silicons in real coker distillates, the response sensitivity of these compounds are close to each other. The adding standard recoveries of Si in coker gasoline and coker diesel are 101% and 98.4%, respectively. The limit of detection of the method is 0.03 μg/g, and therefore, the ICP-OES can be used for quantitative analysis of silicon content in the coker distillates.

关 键 词：焦化汽油 焦化柴油 硅含量 ICP—OES 

分 类 号：TE626[石油与天然气工程—油气加工工程] O657.3[理学—分析化学]