2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、Designation:D7976?14StardSpecificationfPurifiedTerephthalicAcid(PTA)1ThisstardisissuedunderthefixeddesignationD7976thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisiontheyearofla

2、strevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thisspecificationcoverspurifiedterephthalicacid(PTA)fuseinthemanufacturingof

3、polymers.Someexamplesincludetheproductionofpolyestersffiberfilamentyarnfilmcoatingbottleresinapplications.1.2Thefollowingappliestoallspecifiedlimitsinthisspecification:fpurposesofdeterminingconfmancewiththisspecification

4、anobservedvalueacalculatedvalueshallberoundedofftothenearestunitinthelastrighthdigitusedinexpressingthespecificationlimitinaccdancewiththeroundingoffmethodofPracticeE29.1.3ThevaluesstatedinSIunitsaretoberegardedasstard.N

5、ootherunitsofmeasurementareincludedinthisstard.1.4ConsultcurrentOSHAregulationssupplier’sSafetyDataSheetslocalregulationsfallmaterialsusedinthisspecification.1.5Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyas

6、sociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D7881TestMethodfDeterminat

7、ionof4CarboxybenzaldehydepToluicAcidinPurifiedTerephthalicAcidbyCapillaryElectrophesiswithReverseVoltageModeD7882TestMethodfDeterminationof4CarboxybenzaldehydepToluicAcidinPurifiedTerephthalicAcidbyCapillaryElectrophesis

8、withNmalVoltageModeD7883TestMethodfDeterminationof4CarboxybenzaldehydepToluicAcidinPurifiedTerephthalicAcidbyWeakAnionExchangeHighPerfmanceLiquidChromatographyD7884TestMethodfDeterminationof4CarboxybenzaldehydepToluicAci

9、dinPurifiedTerephthalicAcidbyReversePhaseHighPerfmanceLiquidChromatographyE29PracticefUsingSignificantDigitsinTestDatatoDetermineConfmancewithSpecificationsE300PracticefSamplingIndustrialChemicals2.2OtherDocuments:OSHARe

10、gulationsCFR29paragraphs1910.10001910.120033.Terminology3.1Definitions:3.1.1purifiedterephthalicacidn—(C8H6O4)molecularweight166.13whitecrystallinesolidpowdersublimes402to404CabbreviatedasPTA(CAS#100210).3.1.24carboxyben

11、zaldehyden—(C8H6O3)molecularweight150.13whitetoyellowcrystallinesolidpowdermeltingpoint247Cabbreviatedas4CBA(CAS#619669).3.1.3ptoluicacidn—(C8H8O2)molecularweight136.15whitecrystallinesolidpowdermeltingpoint180to181Cabbr

12、eviatedaspTOL(CAS#99945).1ThisspecificationisunderthejurisdictionofASTMCommitteeD16onAromaticHydrocarbonsRelatedChemicalsisthedirectresponsibilityofSubcommitteeD16.02onOxygenatedAromatics.CurrenteditionapprovedDec.12014.

13、PublishedJanuary2015.DOI:10.1520D797614.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3Availabl

14、efromU.S.GovernmentPrintingOfficeSuperintendentofDocuments732N.CapitolSt.NWMailStop:SDEWashingtonDC20401:www.access.gpo.gov.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates14.P

15、roperties4.1PTAshallconfmtothefollowingrequirements:PropertySpecificationASTMTestMethodA4CBAmaxmgkg25D7881D7882D7883D78844CBApluspTOLmaxmgkg190D7881D7882D7883D7884AIfmethanonemethodislistedtheproducerusershouldagreeonthe

16、refereemethod.5.Sampling5.1ThematerialshallbesampledinaccdancewithPracticeE300.6.Keywds6.1purifiedterephthalicacidptoluicacid4carboxybenzaldehydeASTMInternationaltakesnopositionrespectingthevalidityofanypatentrightsasser

17、tedinconnectionwithanyitemmentionedinthisstard.Usersofthisstardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrightstheriskofinfringementofsuchrightsareentirelytheirownresponsibility.Thisstardissubjectto

18、revisionatanytimebytheresponsibletechnicalcommitteemustbereviewedeveryfiveyearsifnotrevisedeitherreapprovedwithdrawn.YourcommentsareinvitedeitherfrevisionofthisstardfadditionalstardsshouldbeaddressedtoASTMInternationalHe

19、adquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommitteewhichyoumayattend.IfyoufeelthatyourcommentshavenotreceivedafairhearingyoushouldmakeyourviewsknowntotheASTMCommitteeonStard

20、sattheaddressshownbelow.ThisstardiscopyrightedbyASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959UnitedStates.Individualreprints(singlemultiplecopies)ofthisstardmaybeobtainedbycontactingASTMattheabove

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