1、Designation: D4734 18aStandard Specification forRefined Benzene-5451This standard is issued under the fixed designation D4734; 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 indic
2、ates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers benzene-545.1.2 The following applies to all specified limits in thisstandard: for purposes of determining conformance with thisstandard
3、, an observed value or a calculated value shall berounded off “to the nearest unit” in the last right-hand digitused in expressing the specification limit in accordance withthe rounding-off method in Practice E29.1.3 The values stated in SI units are to be regarded asstandard. No other units of meas
4、urement are included in thisstandard.1.4 Consult current OSHA regulations, suppliers SafetyData Sheets, and local regulations for all materials used in thisspecification.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establ
5、ished 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:2D848 Test Method for Acid Wash Color of Industrial Aro-matic Hyd
6、rocarbonsD852 Test Method for Solidification Point of BenzeneD1492 Test Method for Bromine Index of Aromatic Hydro-carbons by Coulometric TitrationD3437 Practice for Sampling and Handling Liquid CyclicProductsD4492 Test Method for Analysis of Benzene by Gas Chro-matography (Withdrawn 2018)3D4735 Tes
7、t Method for Determination of Trace Thiophenein Refined Benzene by Gas ChromatographyD5386 Test Method for Color of Liquids Using TristimulusColorimetryD5776 Test Method for Bromine Index of Aromatic Hydro-carbons by Electrometric TitrationD6875 Test Method for Solidification Point of IndustrialOrga
8、nic Chemicals by ThermistorD7011 Test Method for Determination of Trace Thiophenein Refined Benzene by Gas Chromatography and SulfurSelective DetectionD7183 Test Method for Determination of Total Sulfur inAromatic Hydrocarbons and Related Chemicals by Ultra-violet FluorescenceD7184 Test Method for U
9、ltra Low Nitrogen in AromaticHydrocarbons by Oxidative Combustion and ReducedPressure Chemiluminescence DetectionD7360 Test Method for Analysis of Benzene by Gas Chro-matography with External CalibrationD7504 Test Method for Trace Impurities in MonocyclicAromatic Hydrocarbons by Gas Chromatography a
10、ndEffective Carbon NumberD8005 Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE1064 Test Method for Water in Organic Liquids by Coulo-metric Karl Fischer TitrationE2680 Test Method for Ap
11、pearance of Clear, TransparentLiquids (Visual Inspection Procedure)2.2 Other Document:OSHA Regulations, 29 CFR paragraphs 1910.1000 and1910.120041This specification is under the jurisdiction of ASTM Committee D16 onAromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-bili
12、ty of Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane andTheir Derivatives.Current edition approved Nov. 1, 2018. Published December 2018. Originallyapproved in 1987. Last previous edition approved in 2018 as D4734 18. DOI:10.1520/D4734-18a.2For referenced ASTM standards, visit the AST
13、M 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.4Available from U.S. G
14、overnment Printing Office Superintendent of Documents,732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http:/www.access.gpo.gov.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in a
15、ccordance 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.13. Properties3.1 Benzene-545
16、 shall conform to the following require-ments:Property SpecificationASTM TestMethodABenzene, min, weight % 99.90 D4492 or D7360 orD7504Sulfur, max, mg/kg 1.0 D7183Thiophene, max, mg/kg 0.6 D4735 or D7011Toluene, max, weight% 0.05 D4492 or D7360 orD7504Nonaromatic hydrocarbons, max,weight %0.10 D4492
17、 or D7360 orD7504Acid wash color, max pass with 1 D848Bromine index, max 20 D1492 or D5776Appearance, free of haze,particulates or suspendedmatter particlespass E2680Color, max, PtCo scale 20 D5386 or D8005Solidification point, anhydrousbasis, min, C5.45 D852 or D6875AIf more than one method is list
18、ed, the producer and user should agree on thereferee method.3.2 See Section 5 for non-mandatory supplementary re-quirements.4. Sampling4.1 The material shall be sampled in accordance withPractice D3437.5. Supplementary Requirements (Non-mandatory)5.1 The following supplementary requirements shall ap
19、plywhen agreed upon by the supplier and purchaser:Property ASTM Test MethodsANitrogen, max, mg/kg D71841,4 Dioxane D4492Water E1064AIf more than one method is listed, the producer and user should agree on thereferee method.6. Keywords6.1 benzene; benzene-545; purityASTM International takes no positi
20、on respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility
21、.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM
22、International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address sh
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