1、Designation:D254902(Reapproved 2017)Standard Test Method forSeparation of Representative Aromatics and NonaromaticsFractions of High-Boiling Oils by Elution Chromatography1This standard is issued under the fixed designation D2549;the number immediately following the designation indicates the year of
2、original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the separation and determina-tion of repre
3、sentative aromatics and nonaromatics fractionsfrom hydrocarbon mixtures that boil between 232 C and538 C(450 F and 1000 F).Alternative procedures are pro-vided for the separation of 2 g or 10 g of hydrocarbon mixture.NOTE1Some components may not be eluted from the chromato-graphic column for some ty
4、pes of samples under the conditions used inthis method.NOTE2Test Method D2007 is an alternative method of separatinghigh-boiling oils into polar compounds,aromatics,and saturates fractions.1.2 An alternative procedure is provided to handle samplesboiling below 232 C(450 F),but whose 5%point is above
5、178 C(350 F)as determined by Test Method D2887.Thisprocedure is given in Appendix X1.1.3 The values stated in acceptable SI units are to beregarded as the standard.The values given in parentheses areprovided for information purposes only.1.4 This standard does not purport to address all of thesafety
6、 concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with
7、internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D200
8、7 Test Method for Characteristic Groups in RubberExtender and Processing Oils and Other Petroleum-Derived Oils by the Clay-Gel Absorption Chromato-graphic MethodD2425 Test Method for Hydrocarbon Types in Middle Dis-tillates by Mass SpectrometryD2786 Test Method for Hydrocarbon Types Analysis ofGas-O
9、il Saturates Fractions by High Ionizing VoltageMass SpectrometryD2887 Test Method for Boiling Range Distribution of Pe-troleum Fractions by Gas ChromatographyD3239 Test Method for Aromatic Types Analysis of Gas-OilAromatic Fractions by High Ionizing Voltage Mass Spec-trometry3.Terminology3.1 Definit
10、ions of Terms Specific to This Standard:3.1.1 aromatics fractionthe portion of the sample des-orbed with the polar eluants.The aromatics fraction maycontain aromatics,condensed naphthenic-aromatics,aromaticolefins,and compounds containing sulfur,nitrogen,and oxy-gen atoms.3.1.2 nonaromatics fraction
11、the portion of the sampleeluted with n-pentane.The nonaromatics fraction is a mixtureof paraffinic and naphthenic hydrocarbons if the sample is astraight-run material.If the sample is a cracked stock,thenonaromatics fraction will also contain aliphatic and cyclicolefins.4.Summary of Test Method4.1 A
12、 weighed amount of sample is charged to the top of aglass chromatographic column packed with activated bauxiteand silica gel.n-Pentane is added to the column to elute thenonaromatics.When all of the nonaromatics are eluted,thearomatics fraction is eluted by additions of diethyl ether,chloroform,and
13、ethyl alcohol.4.2 The solvents are completely removed by evaporation,and the residues are weighed and calculated as the aromaticsand nonaromatics fractions of the sample.5.Significance and Use5.1 The determination of compound types by mass spec-trometry requires,in some instances,a preliminary separ
14、ation1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.04.0C on Liquid Chromatography.Current edition approved Dec.1,2017.Published December 2017.Originallyapproved in 1966.Last previ
15、ous edition approved in 2012 as D2549 02(2012).DOI:10.1520/D2549-02R17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM web
16、site.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 of the petroleum sample into representative aromatics andnonaromatics f
