ASTM_D_5234_-_92_2012.pdf

Designation:D523492(Reapproved 2012)Standard Guide forAnalysis of Ethylene Product1This standard is issued under the fixed designation D5234;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.1.Scope1.1 This guide covers and provides direction for the analysisof ethylene product in a way that allows the analyst to know thepossible test methods,the units of measure,and the potentialconcentrations range of possible components,so that theconsistency of the analytical measurements is improved.Thisguide is not intended to be used,nor to be construed in anyway,as a set of specifications for ethylene product.1.2 The values stated in SI units are to be regarded as thestandard.1.3 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.2.Referenced Documents2.1 ASTM Standards:2D2504 Test Method for Noncondensable Gases in C2andLighter Hydrocarbon Products by Gas ChromatographyD2505 Test Method for Ethylene,Other Hydrocarbons,andCarbon Dioxide in High-Purity Ethylene by Gas Chroma-tographyD3246 Test Method for Sulfur in Petroleum Gas by Oxida-tive MicrocoulometryD4178 Practice for Calibrating Moisture AnalyzersD4468 Test Method for Total Sulfur in Gaseous Fuels byHydrogenolysis and Rateometric ColorimetryF307 Practice for Sampling Pressurized Gas for Gas Analy-sis3.Terminology3.1 Definitions:3.1.1 ethylene product,nhydrocarbon product containingat least 99.85%mass ethylene.3.2 Symbols:3.2.1 C4s,nsaturated and unsaturated four carbon hydro-carbon compounds.3.2.2 COS,ncarbonyl sulfide.3.2.3 GC,ngas chromatograph.3.2.4 FPD,nflame photometric detector.3.2.5 IC,nion chromatograph.3.2.6 MeOH,nmethanol.3.2.7 NO,nnitric oxide.3.2.8 NO2,nnitrogen dioxide.3.2.9 O2,noxygen.3.2.10 sp.ion electrode,nspecific ion electrode.4.Significance and Use4.1 When the various producers and users of ethyleneproduct deal with the results obtained in analytical testing,inconsistency of units and test methods may cause majorerrors.This guide provides an overview of the typical concen-trations of the possible components found in ethylene product,the methods used in analysis,and the units of measure.Thisoverview is intended to be used to improve the consistency ofmethods and the units reported so that errors are minimized.Each producer and user of ethylene product should immedi-ately review this guide to improve their awareness of thevarious analytical methods in use,the units of measure,andconcentration levels of the possible components.4.2 Although this guide is not to be used for specifications,it can provide a starting point for the various parties to developmutually agreed upon specifications that meet their respectiverequirements.It can also be used as a starting point in findingsuitable test methods for ethylene components.5.Sampling5.1 In general,sample ethylene product using PracticeF307,or a similar method.Do not take liquid ethylene samplesin order to prevent over-pressuring of sample containers andelimination of fire and explosion hazards.Static electricity candevelop when discharging excess hydrocarbon at a fairly rapid1This guide is under the jurisdiction of ASTM Committee D02 on PetroleumProducts and Lubricants and is the direct responsibility of Subcommittee D02.D0.02on Ethylene.Current edition approved Dec.1,2012.Published December 2012.Originallyapproved in 1992.Last previous edition approved in 2007 as D523492(2007).DOI:10.1520/D5234-92R12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 rate from a sample cylinder to ambient conditions.Use agrounding system or strap.5.2 Reactive and Polar Components:5.2.1 Determination of reactive components,such as certainsulfur compounds,is generally believed to require specialsample containers,such as fluorocarbon lined cylinders,orcontainers that have been specially passivated.5.2.2 It is very difficult to obtain a valid sample fordetermination of traces of polar compounds,such as water andammonia,in the laboratory.On-line analyzers,if available,oradsorption of the analyte at the sample source for subsequentlab finish are believed to yield the most accurate results.6.Composition and Test Methods6.1 Table 1 indicates possible composition ranges andASTM test methods for ethylene product.6.2 Table 2 lists other test methods known or believed to bein