1、Designation:D656312Standard Test Method forBenzene,Toluene,Xylene(BTX)Concentrates Analysis byGas Chromatography1This standard is issued under the fixed designation D6563;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of la
2、st revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of the totalnonaromatic hydrocarbons,benzene,toluene,ethylbenzene,xylenes,and tota
3、l C9+aromatic hydrocarbons in BTX con-centrates by capillary column gas chromatography.This testmethod is applicable to materials with a final boiling pointbelow 215C.1.2 This test method may also be used to determine therelative distribution of the individual C8aromatic hydrocarbonisomers in mixed
4、xylenes.1.3 Individual components can be determined from 0.01 to90%.1.4 In determining the conformance of the test results usingthis method to applicable specifications,results shall berounded off in accordance with the rounding-off method ofPractice E29.1.5 The values stated in SI units are to be r
5、egarded asstandard.No other units of measurement are included in thisstandard.1.6 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 determin
6、e the applica-bility of regulatory limitations prior to use.For a specificprecautionary statement,see Section 9.2.Referenced Documents2.1 ASTM Standards:2D3437 Practice for Sampling and Handling Liquid CyclicProductsD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydroca
7、rbons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE355 Practice for Gas Chromatography Terms and Relation-shipsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1510 Practice fo
8、r Installing Fused Silica Open TubularCapillary Columns in Gas Chromatographs2.2 Other Documents:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 extracted reformate,nan aromatic concentrate ob-tained by solvent extractio
9、n of reformate.3.1.2 reformate,nthe product of a catalytic process thatincreases the concentration of aromatic hydrocarbons.3.1.3 pyrolysis gasoline,ndepentanized by-product recov-ered from ethylene manufacture.3.1.4 synthetic blend,nblend of reagent hydrocarbons thatsimulate a process product.3.1.5
10、 hydrogenated pyrolysis gasoline,npyrolysis gaso-line that has been treated with hydrogen to reduce the olefinscontent.3.1.6 crude ethylbenzene,nproduct produced from thereaction of impure fluid cat cracking,(FCC)ethylene andbenzene.3.1.6.1 DiscussionIt typically contains greater than 40%of ethylben
11、zene and benzene.3.1.7 light blending aromatics feedstock,nlight aromaticsfraction(with high amounts of benzene and toluene)typicallyrecovered from the isomerization of a p-xylene or m-xylenedepleted C8aromatics stream.1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydr
12、ocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.01 on Benzene,Toluene,Xylenes,Cyclohexane and TheirDerivatives.Current edition approved June 1,2012.Published July 2012.Originally approvedin 2000.Last previous edition approved in 2011 as D6463 11a.DOI:10.1520/D6563-
13、12.2For 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.3Available from U.S.Government Printing Office Superintendent o
14、f Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.*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 3.1.8 mixed xylenes,na mixture of
15、 C8aromatic hydrocar-bon isomers including ethylbenzene,but excluding stryene.4.Summary of Test Method4.1 The specimen to be analyzed is injected into a gaschromatograph equipped with a flame ionization detector(FID)and a capillary column.The peak area of each component ismeasured and adjusted using
16、 effective carbon number(ECN)response factors.The concentration of each component iscalculated based on its relative percentages of total adjustedpeak area and normalized to 100.00.4.2 Results can be reported as either volume or weightpercent.Volumetric results can be derived by dividing eachcomponents weight percent by its relative density and re-normalizing to 100%.5.Significance and Use5.1 This test method was primarily developed to determinebenzene,toluene,and xylenes in chemical intermediat
