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《大庆原油含氮组分的界面扩张黏弹性质.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、石油学报(石油加工)2O11年10月ACTAPETROLEISINICA(PETRoIEUMPROCESSINGSECTION)第27卷第5期文章编号:1001—8719(2011)05—0737—09大庆原油含氮组分的界面扩张黏弹性质司友华,靳志强,丰杰,张路,赵濉(中国科学院理化技术研究所,北京100190)摘要:采用络合法和吸附色层法对大庆原油含氮组分进行了分离和富集,得到氮含量不同的2种含氮组分(以下简称N1、N2)。采用悬挂滴方法,研究了N1、N2在煤油一水界面上的扩张流变性质,考察了扩张频率和组分浓度对扩张模量和相角的影响。结果表明,N1、N2具有相近的相对分子质量,表现出
2、大体类似的界面扩张变化规律;但由于氮含量不同,所以具有不同的界面扩张行为。组分浓度较低时,由于N1的氮含量较高,其分子结构中含有更多的氮杂环,活性较强,体积较大,表现为油一水界面张力较低,扩张模量较大;组分浓度较高时,由于N2分子体积较小,在油一水界面上排列更为紧密,易于在界面与体相间发生扩散交换,表现为油一水界面张力较低,扩张模量较小。2种含氮活性组分不同的界面扩张黏弹性质可从其不同特征的微观弛豫过程得到解释。关键词:大庆原油;含氮活性组分;界面扩张黏弹性质;界面张力弛豫中图分类号:0647文献标识码:Adoi:10.3969/j.issn.1001—8719.2011.05.013
3、InterfacialDilationalViscOelastjcityofNitrogenContainingComponentsofDaqingCrudeOilSIYouhua,JINZhiqiang,FENGJie,ZHANGLu,ZHA0Sui(TechnicalInstituteofPhysicsandChemistry,ChineseAcademyofSciences,Beijing100190,China)Abstract:TwokindsofnitrogencontainingcomponentsofDaqingcrudeoil,N1andN2,wereenriched
4、andseparatedbycomplexationandadsorptionchromatography,respectively.Thedilationalviscoelasticpropertiesatkerosene~waterinterfacecontainingN1andN2wereinvestigated,respectively,bymeansofoscillatingdropmethod.Thedependenciesofdilationalmodu1usandphaseangleonfrequency,andN1andN2concentrationwereexpou
5、nded.TheexDerimenta1resultsshowedthattheinterfacialdilationalregularityofN1andN2weresimilartoeachotherbecauseoftheircloserelativemolecularmass.However,duetotheirdifferentcontentofnitrOgen,theirinterfacialdilationalbehaviorsweredifferent.ComparedN1withN2eachother,thenitrogencontentofN1washigheran
6、dnitrogenheterocyclicringsinthemoleculestructureofN1wasmore,soitsvolumewaslargerandactivitywasstronger,andtheoil—waterinterfacialtensionwithN1wasloweranddilationaImoduluswaslargeratlowerconcentrations.BecausethemoleculeofN2possessedsmallervolume,theyarrangedmorecloselyattheinterfaceofoil—wateran
7、dwereeasytodiffusebetWeeninterfaceandbulkphase,resultinginlowerinterfacialtensionandsmallerdilationalmodulusathigherconcentrations.Thedifferenceininterfacialdilationalviscoelasticityfor收稿日期:2010-12—13基金项目:中国科学院知识创新工程重大项目(KJC
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