ASTM_D_4790_-_20a.pdf

Designation:D479020aStandard Terminology ofAromatic Hydrocarbons and Related Chemicals1This standard is issued under the fixed designation D4790;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.Referenced Documents1.1 ASTM Standards:2D835 Specification for Refined Benzene-485(Withdrawn1997)3D841 Specification for Nitration Grade TolueneD843 Specification for Nitration Grade XyleneD846 Specification for Ten-Degree Xylene(Withdrawn1989)3D847 Test Method for Acidity of Benzene,Toluene,Xylenes,Solvent Naphthas,and Similar Industrial Aro-matic HydrocarbonsD848 Test Method for Acid Wash Color of Industrial Aro-matic HydrocarbonsD1015 Test Method for Freezing Points of High-PurityHydrocarbons(Withdrawn 2019)3D1016 Test Method for Purity of Hydrocarbons from Freez-ing Points(Withdrawn 2019)3D1129 Terminology Relating to WaterD1298 Test Method for Density,Relative Density,or APIGravity of Crude Petroleum and Liquid Petroleum Prod-ucts by Hydrometer MethodD1492 Test Method for Bromine Index of Aromatic Hydro-carbons by Coulometric TitrationD1840 Test Method for Naphthalene Hydrocarbons in Avia-tion Turbine Fuels by Ultraviolet SpectrophotometryD2031 Test Method for Reducing Substances in RefinedPyridine(Withdrawn 2003)3D2121 Test Methods for Polymer Content of Styrene Mono-merD2147 Method of Test for Detection and Estimation ofWater-Insoluble Impurities in Refined Phenol by CloudPoint Depression(Withdrawn 1979)3D2269 Test Method for Evaluation of White Mineral Oils byUltraviolet AbsorptionD2279 Method of Test for Acid Wash Color of RefinedNaphthalene(Withdrawn 1982)3D2323 Specification for Refined Pyridine(1 Degree)(With-drawn 2003)3D2359 Specification for Refined Benzene-535D2403 Specification for Refined Phthalic Anhydride-1308(Withdrawn 2008)3D2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD2827 Specification for Styrene MonomerD2935 Test Method for Apparent Density of IndustrialAromatic Hydrocarbons(Withdrawn 2005)3D3980 Practice for Interlaboratory Testing of Paint andRelated Materials(Withdrawn 1998)3D4053 Test Method for Benzene in Motor and AviationGasoline by Infrared Spectroscopy(Withdrawn 2013)3D4734 Specification for Refined Benzene-545E12 Terminology Relating to Density and Specific Gravityof Solids,Liquids,and Gases(Withdrawn 1996)32.Terminologyabsorbance,nthe logarithm to the base 10 of the reciprocalof the relative transmittance,T,expressed as:A 5 log101/T!5 2log10T(1)D1840,D2269,D4053;D02accuracy,nthe agreement between the mean of a series ofrepeated measurements of a property and the acceptedreference value of the property.D3980;D01acidity,nthe number of milligrams of sodium hydroxideconsumed when 100 mL of the sample are titrated under theconditions prescribed in this method.D847;D16acid reaction,na characteristic of materials producing theacid-color of the indicator used under the conditions pre-scribed in this method.D847;D16acid wash color,nthe color developed in the separated acidwhen a sample is agitated with sulfuric acid under thecondition prescribed in this method.D848;D2279;D161This terminology is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.05 on Editorial and Nomenclature.Current edition approved Oct.1,2020.Published October 2020.Originallyapproved in 1988.Last previous edition approved in 2020 as D4790 20.DOI:10.1520/D4790-20A.The boldface designations refer to the original source of the definition and theASTM Technical Committee having jurisdiction.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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright 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.1aldehydes,na broad class of organic compounds having ageneric formula RCHO,and characterized by a carbonylgroup.alkaline or basic reaction,na characteristic of the materialsproducing the alkalicolor of the indicator used under theconditions prescribed in this method.D847;D16alpha-methylstyrene,n2-phenylpropene(C9H10)molweight 119.16;colorless liquid;subject to polymerization byheat or catalysts;freezing point,2