1、Designation:D806222Standard Specification forPurified Terephthalic Acid(PTA)with Low p-Toluic Acid1This standard is issued under the fixed designation D8062;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、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 specification covers purified terephthalic acid(PTA)for use in the production of polyesters for superfinedenier fiber.1.2 The followi
3、ng applies to all specified limits in thisspecification:for purposes of determining conformance withthis specification,an observed value or a calculated value shallbe rounded off to the nearest unit in the last right-hand digitused in expressing the specification limit,in accordance withthe rounding
4、-off method of Practice E29.1.3 Consult current OSHA regulations,suppliers SafetyData Sheets,and local regulations for all materials used in thisspecification.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard
5、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.1.6 This international
6、 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.
7、Referenced Documents2.1 ASTM Standards:2D7881 TestMethodforDeterminationof4-Carboxybenzaldehyde and p-Toluic Acid in PurifiedTerephthalic Acid by Capillary Electrophoresis with Re-verse Voltage ModeD7882 TestMethodforDeterminationof4-Carboxybenzaldehyde and p-Toluic Acid in PurifiedTerephthalic Acid
8、 by Capillary Electrophoresis with Nor-mal Voltage ModeD7883 TestMethodforDeterminationof4-Carboxybenzaldehyde and p-Toluic Acid in PurifiedTerephthalic Acid by Weak Anion Exchange High Perfor-mance Liquid ChromatographyD7884 TestMethodforDeterminationof4-Carboxybenzaldehyde and p-Toluic Acid in Pur
9、ifiedTerephthalic Acid by Reverse Phase High PerformanceLiquid ChromatographyD8063 Test Method for Water in Purified Terephthalic Acid(PTA)by Volumetric Karl Fischer TitrationD8130 Test Method for Determination of Metals in PurifiedTerephthalic Acid(PTA)by Inductively Coupled PlasmaAtomic Emission S
10、pectrometric MethodD8207 Test Method for Determination of Metals in PurifiedTerephthalic Acid(PAT)by Atomic Absorption(AA)SpectrometryE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE300 Practice for Sampling Industrial Chemicals2.2 Other Standards:O
11、SHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Terminology3.1 Definitions:3.1.1 4-carboxybenzaldehyde,n(C8H6O3)molecularweight,150.13;white to yellow crystalline solid or powder;melting point,247 C;abbreviated as 4-CBA(CAS#619-66-9).3.1.2 p-toluic acid,n(C8H8O2)molecular weight,136.15;wh
12、ite crystalline solid or powder;melting point,180 C to181 C;abbreviated as p-TOL(CAS#99-94-5).1This specification is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.02 on Oxygenated Aromatics.Cur
13、rent edition approved Jan.1,2022.Published January 2022.Originallyapproved in 2019.Last previous edition approved in 2021 as D8062 21.DOI:10.1520/D8062-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStan
14、dards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from U.S.Government Printing Office,Superintendent ofDocuments,732 N.Capitol St.,NW,Washington,DC 20401-0001,http:/www.access.gpo.gov.*A Summary of Changes section appears at the end of this standardC
15、opyright 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 Internation
16、al Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.13.1.3 purified terephthalic acid,n(C8H6O4)molecularweight,166.13,white crystalline solid or powder;sublimes,402 C to 404 C;abbreviated as PTA(CAS#100-21-0).3.1.4 totalheavymetals,nrefertomolybdenum,chromium,nickel,cobalt,manganese,titanium,and iron byindustry standard.4.Properties4.1 PTA shall conform to the following requirements:PropertySpecificationASTM Test MethodA4-CBA,m
