ASTM_D_7796_-_21.pdf

Designation:D779621Standard Test Method forAnalysis of Ethyl tert-Butyl Ether(ETBE)by GasChromatography1This standard is issued under the fixed designation D7796;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.Scope*1.1 This test method covers the determination of the purityof ethyl tert-butyl ether(ETBE)by gas chromatography.It alsoprovides a procedure to measure impurities in ETBE such asC4to C12olefins,methyl,isopropyl and tert-butyl alcohols,methyl sec-butyl and methyl tert-amyl ethers,acetone,andmethyl ethyl ketone.1.2 This test method is not applicable to the determinationof ETBE in gasoline.1.3 Water cannot be determined by this test method andshall be measured by a procedure such as Test Method D6304and the result used to normalize the chromatographic values.1.4 Most of the impurities in ETBE are resolved by the testmethod,however,some co-elution is encountered.1.5 This test method is inappropriate for impurities that boilat temperatures higher than 180 C or for impurities that causepoor or no response in a flame ionization detector,such aswater.1.6 The values stated in SI units of measurement arepreferred and used throughout the standard.Alternate units,incommon usage,are also provided to improve clarity and aid theuser of this test method.1.7 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3700 Practice for Obtaining LPG Samples Using a Float-ing Piston CylinderD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD4626 Practice for Calculation of Gas ChromatographicResponse FactorsD6304 Test Method for Determination of Water in Petro-leum Products,Lubricating Oils,and Additives by Cou-lometric Karl Fischer TitrationD7618 Specification for Ethyl Tertiary-Butyl Ether(ETBE)for Blending with Aviation Spark-Ignition Engine FuelE355 Practice for Gas Chromatography Terms and Relation-shipsE594 Practice for Testing Flame Ionization Detectors Usedin Gas or Supercritical Fluid Chromatography3.Terminology3.1 DefinitionsThis test method makes reference to manycommon and gas chromatographic procedures,terms,andrelationships.Detailed definitions of these can be found inPractices E355 and E594,and Terminology D4175.3.2 Definitions of Terms Specific to This Standard:3.2.1 C4to C12olefins,ncommon olefin impurities inETBE including unreacted feedstock and dimers or trimers offeed such as trimethylpentene or pentamethylheptene.4.Summary of Test Method4.1 A representative aliquot of the ETBE product sample isintroduced into a gas chromatograph equipped with a methylsilicon bonded phase fused silica open tubular column.Heliumcarrier gas transports the vaporized aliquot through the columnwhere the components are separated by the chromatographic1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.04.0L on Gas Chromatography Methods.Current edition approved Dec.1,2021.Published December 2021.Originallyapproved in 2012.Last previous edition approved in 2017 as D7796 17.DOI:10.1520/D7796-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.*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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1?process.Components are sensed by a flame ionization detectoras they elute from the column.4.2 The detector signal is processed by an electronic dataacquisition system or integrating computer.Each eluting com-ponent is identified by comparing its retention time to thoseestablished by analyzing standards under identical conditio