1、Designation: D7951 14D7951 17Standard Specification forDisproportionation (TDP) Toluene1This standard is issued under the fixed designation D7951; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number
2、in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers Disproportionation (TDP) toluene.1.2 The following applies to all specified limits in this specification: for purpos
3、es of determining conformance with thisspecification, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit usedin expressing the specification limit, in accordance with the rounding-off method of Practice E29.1.3 The values stated in SI unit
4、s are to be regarded as standard. No other units of measurement are included in this standard.1.4 Consult current OSHA regulations, suppliers Safety Data Sheets, and local regulations for all materials used in thisspecification.1.5 This standard does not purport to address all of the safety concerns
5、, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1.6 This international standard was developed in accordance with internationally recogniz
6、ed principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D848 Test Method for Acid
7、Wash Color of Industrial Aromatic HydrocarbonsD849 Test Method for Copper Strip Corrosion by Industrial Aromatic Hydrocarbons1 This specification is under the jurisdiction of ASTM Committee D16 on Aromatic Hydrocarbons Aromatic, Industrial, Specialty and Related Chemicals and is the directresponsibi
8、lity of Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their Derivatives.Current edition approved Dec. 1, 2014June 1, 2017. Published January 2015June 2017. Originally approved in 2014. Last previous edition approved in 2014 as D7951 14. DOI: 10.1520/D7951-14.10.1520/D7951-17.2 Fo
9、r referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to pro
10、vide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the
11、 standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1D850 Test Method for Distillation of Industrial Aromatic Hydrocarbons and Related MaterialsD1209 Test Method for
12、Color of Clear Liquids (Platinum-Cobalt Scale)D2360 Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography (Withdrawn 2016)3D3437 Practice for Sampling and Handling Liquid Cyclic ProductsD4052 Test Method for Density, Relative Density, and API Gravity of Liquids b
13、y Digital Density MeterD4492 Test Method for Analysis of Benzene by Gas ChromatographyD5386 Test Method for Color of Liquids Using Tristimulus ColorimetryD6526 Test Method for Analysis of Toluene by Capillary Column Gas ChromatographyD7183 Test Method for Determination of Total Sulfur in Aromatic Hy
14、drocarbons and Related Chemicals by UltravioletFluorescenceD7360 Test Method for Analysis of Benzene by Gas Chromatography with External CalibrationD7504 Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective CarbonNumberE29 Practice for Using Signif
15、icant Digits in Test Data to Determine Conformance with SpecificationsE2680 Test Method for Appearance of Clear, Transparent Liquids (Visual Inspection Procedure)2.2 Other Documents:4OSHA Regulations, 29 CFR paragraphs 1910.1000 and 1910.12003 The last approved version of this historical standard is
16、 referenced on www.astm.org.4 Available from U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http:/www.access.gpo.gov.D7951 1723. Properties3.1 Disproportionation toluene shall conform to the following requirements:Property S
17、pecification ASTMTest MethodAPurity, min, wt% 95.0 D2360,D6526, orD7504Benzene, max, wt% 0.1 D2360, D6526 orD7504Impurities eluting afterOrthoxylene, max, wt% 0.1D2360, D6526, orD75041,4-Dioxane, max, mg/kg 10 D7504Nonaromatic hydrocarbons,max, wt%2.5 D2360 orD7504Sulfur, max, mg/kg 1 D7183Acid wash
18、 color, max pass with 2 D848Copper corrosion pass (1A or 1B) D849Appearance B .Appearance, free of haze,particulates or suspendedmatter particlespass E2680Color, Pt/Co scale, max 20 D5386Relative density,15.56/15.56 C0.869 to 0.873 D4052A If more than one method is listed for a property the producer
19、 and user shall agree on the reference method.B Clear liquid free of sediment and haze at 18.3 to 25.6 C.D7951 1734. Sampling4.1 The material shall be sampled in accordance with Practice D3437.5. Keywords5.1 tolueneASTM International takes no position respecting the validity of any patent rights ass
20、erted 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.This standard is subject to revision at any time b
21、y 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 International Headquarters. Your comments will recei
22、ve 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 shown below.This standard is copyrighted by ASTM Inter
23、national, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 174
