ASTM_D_611_-_12.pdf

Designation:D61112Designation:2/98Standard Test Methods forAniline Point and Mixed Aniline Point of Petroleum Productsand Hydrocarbon Solvents1This standard is issued under the fixed designation D611;the number immediately following the designation indicates the year oforiginal 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 These test methods cover the determination of theaniline point of petroleum products and hydrocarbon solvents.Test Method A is suitable for transparent samples with aninitial boiling point above room temperature and where theaniline point is below the bubble point and above the solidifi-cation point of the aniline-sample mixture.Test Method B,athin-film method,is suitable for samples too dark for testing byTest MethodA.Test Methods C and D are for samples that mayvaporize appreciably at the aniline point.Test Method D isparticularly suitable where only small quantities of sample areavailable.Test Method E describes a procedure using anautomatic apparatus suitable for the range covered by TestMethods A and B.1.2 These test methods also cover the determination of themixed aniline point of petroleum products and hydrocarbonsolvents having aniline points below the temperature at whichaniline will crystallize from the aniline-sample mixture.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 WARNINGMercury has been designated by manyregulatory agencies as a hazardous material that can causecentral nervous system,kidney and liver damage.Mercury,orits vapor,may be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercury andmercury containing products.See the applicable product Ma-terial Safety Data Sheet(MSDS)for details and EPAswebsitehttp:/www.epa.gov/mercury/faq.htmfor addi-tional information.Users should be aware that selling mercuryand/or mercury containing products into your state or countrymay be prohibited by law.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific warningstatements are given in Section 7.2.Referenced Documents2.1 ASTM Standards:2D1500 Test Method for ASTM Color of Petroleum Products(ASTM Color Scale)E1 Specification for ASTM Liquid-in-Glass Thermometers3.Terminology3.1 Definitions:3.1.1 aniline point,nthe minimum equilibrium solutiontemperature for equal volumes of aniline and sample.3.1.2 mixed aniline point,nthe minimum equilibriumsolution temperature of a mixture of two volumes of aniline,one volume of sample,and one volume of n-heptane ofspecified purity.4.Summary of Test Method4.1 Specified volumes of aniline and sample,or aniline andsample plus n-heptane,are placed in a tube and mixedmechanically.The mixture is heated at a controlled rate untilthe two phases become miscible.The mixture is then cooled ata controlled rate and the temperature at which two phasesseparate is recorded as the aniline point or mixed aniline point.5.Significance and Use5.1 The aniline point(or mixed aniline point)is useful as anaid in the characterization of pure hydrocarbons and in the1These test methods are under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and are the direct responsibilityof D02.04.0D on Physical and Chemical Methods.Current edition approved Nov.1,2012.Published November 2012.Originallyapproved in 1941.Last previous edition approved in 2007 as D61107.DOI:10.1520/D0611-12.These test methods were adopted as a joint ASTM-IP standard in 1964.2For 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 website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 analysis of hydrocarbon mixtures.Aromatic hydrocarbonsexhibit the lowest,and paraffins the highest values.Cyclopar-affins and olefins exhibit values that lie between those forparaffins and aromatics.In homologous series the anilinepoints increase with increasing molecular weight.Although itoccasionally is used in combination with other physical prop-erties in correlative methods for hydrocarbon analysis,theaniline point is most often used to provide an estimate of thearomatic hydrocarbon content of mixtures.6.Apparatus6.1 For details of the aniline point apparatus required foreach method see: