1、Designation:D521112Standard Specification forXylenes for p-Xylene Feedstock1This standard is issued under the fixed designation D5211;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 i
2、ndicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers xylenes for p-xylene feed-stock.These xylenes typically are extracted from reformate.1.2 The following applies to all specified limits
3、in thisspecification:for purposes of determining conformance withthis specification,an observed value or calculated value shallbe rounded off“to the nearest unit”in the last right hand digitused in expressing the specification limit,in accordance withthe rounding-off method of Practice E29.1.3 The v
4、alues stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 Consult current OSHA regulations,suppliers MaterialSafety Data Sheets(MSDS),and local regulations for allmaterials used in this specification.2.Referenced Documents2.1 ASTM Standards:2D
5、850 Test Method for Distillation of Industrial AromaticHydrocarbons and Related MaterialsD1209 Test Method for Color of Clear Liquids(Platinum-Cobalt Scale)D3437 Practice for Sampling and Handling Liquid CyclicProductsD5194 Test Method for Trace Chloride in Liquid AromaticHydrocarbonsD5386 Test Meth
6、od for Color of Liquids Using TristimulusColorimetryD5808 Test Method for Determining Chloride in AromaticHydrocarbons and Related Chemicals by Microcoulom-etryD6069 Test Method for Trace Nitrogen in Aromatic Hydro-carbons by Oxidative Combustion and Reduced PressureChemiluminescence DetectionD6563
7、Test Method for Benzene,Toluene,Xylene(BTX)Concentrates Analysis by Gas ChromatographyD7183 Test Method for Determination of Total Sulfur inAromatic Hydrocarbons and Related Chemicals by Ultra-violet FluorescenceD7184 Test Method for Ultra Low Nitrogen in AromaticHydrocarbons by Oxidative Combustion
8、 and ReducedPressure Chemiluminescence DetectionD7359 Test Method for Total Fluorine,Chlorine and Sulfurin Aromatic Hydrocarbons and Their Mixtures by Oxida-tive Pyrohydrolytic Combustion followed by Ion Chroma-tography Detection(Combustion Ion Chromatography-CIC)D7457 Test Method for Determining Ch
9、loride in AromaticHydrocarbons and Related Chemicals by Microcoulom-etryD7504 Test Method for Trace Impurities in MonocyclicAromatic Hydrocarbons by Gas Chromatography andEffective Carbon NumberD7536 Test Method for Chlorine in Aromatics by Mono-chromatic Wavelength Dispersive X-ray FluorescenceSpec
10、trometryE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Other Document:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Properties3.1 Xylenes for p-xylene feedstock shall conform to thefollowing requirements:1This specification is unde
11、r the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.01 on Benzene,Toluene,Xylenes,Cyclohexane and TheirDerivatives.Current edition approved Nov.1,2012.Published December 2012.Originallyapproved in 1991.Last previo
12、us edition approved in 2011 as D5211 11.DOI:10.1520/D5211-12.2For 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.3Avai
13、lable from U.S.Government Printing Office Superintendent of 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 1
14、9428-2959.United States1 PropertySpecificationASTMTestMethodp-xylene,Amin,weight%18D6563 or D7504Ethylbenzene,Amax,weight%20D6563 or D7504Toluene,max,weight%0.5D6563 or D7504C9 and higher boiling aromatichydrocarbons,max,weight%1.0D6563 or D7504Nonaromatic hydrocarbons,max,weight%0.3D6563 or D7504Su
15、lfur,max,mg/kg1.0D7183AppearanceB.Color,max,Pt/Co scale20D1209 or D5386Distillation range,at 101.3 kPa(760 mm Hg)pressure,max,C5D850Initial distillation temperature,min,C137.Dry point,max,C143.AThe p-xylene and ethylbenzene specifications represent the weight percentageof these components within the
16、 C8aromatics and not in the total sample.BClear liquid free of sediment and haze when observed at 18.3 to 25.6C(65 to78F).4.Sampling4.1 The material shall be sampled in accordance withPractice D3437.5.Calculation5.1 Calculate the weight percent relative distribution of eachC8aromatic hydrocarbon in the total C8aromatic hydrocarbonfraction as follows:Fi5Wi(Wi3100%(1)where:Fi=weight fraction of C8aromatic component i in the totalC8aromatic hydrocarbon fraction,Wi=weight fraction of C8aromatic comp
