1、Designation:D336618Standard Test Method forColor of Maleic Anhydride in the Molten State and AfterHeating(Platinum-Cobalt Scale)1This standard is issued under the fixed designation D3366;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revisio
2、n,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 visualmeasurement of the color of maleic anhydride melt bef
3、ore andafter prolonged heating under specified conditions of time andtemperature.Color values are expressed in terms of platinum-cobalt standards.1.2 This test method covers the range 0 to 100 colorstandard numbers.1.3 In determining the conformance of the test results usingthis method to applicable
4、 specifications,results shall berounded off in accordance with the rounding-off method ofPractice E29.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if
5、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.For specific hazard statements see Sections 7,10.2.1,and10.4.2.1.6 This interna
6、tional 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)Commit
7、tee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD1209 Test Method for Color of Clear Liquids(Platinum-Cobalt Scale)D1686 Test Method for Color of Solid Aromatic Hydrocar-bons and Related Materials in the Molten State(Platinum-Cobalt Scale)D3438 Practice for Samplin
8、g and Handling Naphthalene,Maleic Anhydride,and Phthalic AnhydrideD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsD8005 Test Method for Color of Clear Liquids(Platinum-Cobalt Scale)E29 Practice for Using Significant Digits in Test Data
9、toDetermine Conformance with SpecificationsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Other Document:3OSHA Regulations,29 CFRparagraphs 1910.1000 and1910.12003.Summary of Test Method3.1 A specimen is melted at 60C.3.2 A freshly melted specimen
10、 is filled to mark into aNessler tube and compared with Platinum-Cobalt color stan-dards.3.3 After heating for 2 h at 140C,the specimen is againcompared to the color standards.4.Significance and Use4.1 The color of maleic anhydride can be an indication ofthe purity of these materials.High colors nor
11、mally indicatecontamination or decomposition.This test method is suitablefor setting specifications and for use as an internal qualitycontrol tool.5.Apparatus5.1 Color Comparison TubesMatched 100-mL,tall-formNessler tubes,provided with ground-on,optically clear,glass1This test method is under the ju
12、risdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.02 on Oxygenated Aromatics.Current edition approved Feb.1,2018.Published June 2018.DOI:10.1520/D3366-18.Last previous edition approved in 2003 as D3366-95(2003
13、)1which waswithdrawn January 2012 and reinstated in February 2018.2For 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.
14、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 standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-
15、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
16、Barriers to Trade(TBT)Committee.1 caps.Tubes should be selected so that the height of the 100-mLgraduation mark is 300 6 3 mm above the bottom of the tube.The use of heat resistant tubes is preferred for safety reasons.5.2 Color Comparator,constructed to permit visual com-parison of light transmitted through tall-form,100-mL Nesslertubes in the direction of their longitudinal axes.The compara-tor should be constructed so that white light is reflected off awhite plate and directed with equal inte