ASTM_D_1159_-_07_2012.pdf

Designation:D115907(Reapproved 2012)Designation:130/98Standard Test Method forBromine Numbers of Petroleum Distillates and CommercialAliphatic Olefins by Electrometric Titration1This standard is issued under the fixed designation D1159;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 This test method2covers the determination of thebromine number of the following materials:1.1.1 Petroleum distillates that are substantially free ofmaterial lighter than isobutane and that have 90%distillationpoints(by Test Method D86)under 327C(626F).This testmethod is generally applicable to gasoline(including leaded,unleaded,and oxygenated fuels),kerosine,and distillates in thegas oil range that fall in the following limits:90%Distillation Point,C(F)Bromine Number,max2Under 205(400)175205 to 327(400 to 626)101.1.2 Commercial olefins that are essentially mixtures ofaliphatic mono-olefins and that fall within the range of 95 to165 bromine number(see Note 1).This test method has beenfound suitable for such materials as commercial propylenetrimer and tetramer,butene dimer,and mixed nonenes,octenes,and heptenes.This test method is not satisfactory for normalalpha-olefins.NOTE1These limits are imposed since the precision of this testmethod has been determined only up to or within the range of thesebromine numbers.1.2 The magnitude of the bromine number is an indicationof the quantity of bromine-reactive constituents,not an iden-tification of constituents;therefore,its application as a measureof olefinic unsaturation should not be undertaken without thestudy given in Annex A1.1.3 For petroleum hydrocarbon mixtures of bromine num-ber less than 1.0,a more precise measure for bromine-reactiveconstituents can be obtained by using Test Method D2710.Ifthe bromine number is less than 0.5,then Test Method D2710or the comparable bromine index methods for industrialaromatic hydrocarbons,Test Methods D1492 or D5776 mustbe used in accordance with their respective scopes.Thepractice of using a factor of 1000 to convert bromine numberto bromine index is not applicable for these lower values ofbromine number.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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.For specificwarning statements,see Sections 7,8,and 9.2.Referenced Documents2.1 ASTM Standards:3D86 Test Method for Distillation of Petroleum Products atAtmospheric PressureD1193 Specification for Reagent WaterD1492 Test Method for Bromine Index of Aromatic Hydro-carbons by Coulometric TitrationD2710 Test Method for Bromine Index of Petroleum Hydro-carbons by Electrometric TitrationD5776 Test Method for Bromine Index of Aromatic Hydro-carbons by Electrometric Titration3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 bromine numberthe number of grams of brominethat will react with 100 g of the specimen under the conditionsof the test.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.06 on Analysis of Liquid Fuels and Lubricants.In the IP,this test method is under the jurisdiction of the StandardizationCommittee.Current edition approved April 15,2012.Published April 2012.Originallyapproved in 1951.Last previous edition approved in 2007 as D115907.DOI:10.1520/D1159-07R12.2Dubois,H.D.,and Skoog,D.A.,“Determination of Bromine AdditionNumbers,”Analytical Chemistry,Vol 20,1948,pp.624627.3For 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 4.Summary of Test Method4.1 A known weight of the specimen dissolved in theselected solvent(see 8.1)maintained at 0 to 5C(32 to 41F)is titrated with standard bromide-bromate solution.The endpoint is indicated by a sudden change in potential on anelectrometric end point titration apparatus due to the presenceof free bromine.5.Significance and Use5.1 The bromine number is useful as a measure of aliphaticunsaturation in petroleum samples.When used in conjunctionwith the calculation procedure described