1、Designation: D 7185 08Standard Specification forLow Toluene Low Dioxane (LTLD) Benzene1This standard is issued under the fixed designation D 7185; 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. Scope*1.1 This specification covers a grade of benzene known asLow Toluene Low Dioxane (LTLD) Benzene.1.2 The following applies to all specified limits
3、 in thisstandard: for purposes of determining conformance with thisstandard, 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 of Practice E29.1.3 The val
4、ues stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 Consult current OSHA regulations, suppliers MaterialSafety Data Sheets, and local regulations for all materials usedin this specification.2. Referenced Documents2.1 ASTM Standards:2D
5、 848 Test Method for Acid Wash Color of IndustrialAromatic HydrocarbonsD 852 Test Method for Solidification Point of BenzeneD 1209 Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)D 1685 Test Method for Traces of Thiophene in Benzene bySpectrophotometryD 3437 Practice for Sampling and H
6、andling Liquid CyclicProductsD 4492 Test Method for Analysis of Benzene by GasChromatographyD 4735 Test Method for Determination of Trace Thiophenein Refined Benzene by Gas ChromatographyD 5194 Test Method for Trace Chloride in Liquid AromaticHydrocarbonsD 5386 Test Method for Color of Liquids Using
7、 TristimulusColorimetryD 5808 Test Method for Determining Organic Chloride inAromatic Hydrocarbons and Related Chemicals by Micro-coulometryD 6069 Test Method for Trace Nitrogen in Aromatic Hy-drocarbons by Oxidative Combustion and Reduced Pres-sure Chemiluminescence DetectionD 6304 Test Method for
8、Determination of Water in Petro-leum Products, Lubricating Oils, and Additives by Coulo-metric Karl Fischer TitrationD 6875 Test Method for Solidification Point of IndustrialOrganic Chemicals by ThermistorD 7011 Test Method for Determination of Trace Thiophenein Refined Benzene by Gas Chromatography
9、 and SulfurSelective DetectionD 7183 Test Method for Determination of Total Sulfur inAromatic Hydrocarbons and Related Chemicals by Ultra-violet FluorescenceD 7184 Test Method for Ultra Low Nitrogen in AromaticHydrocarbons by Oxidative Combustion and ReducedPressure Chemiluminescence DetectionD 7375
10、 Test Method for Trace Quantities of Water inAromatic Hydrocarbons and Their Mixtures by Coulom-etric Karl Fischer TitrationE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Other Document:OSHA Regulations, 29 CFR paragraphs 1910.1000 and1910.12003
11、1This specification is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and TheirDerivatives.Current edition approved Dec. 1, 2008. Published December 2008. Orig
12、inallyapproved in 2006. Last previous edition approved in 2007 as D 7185 - 07.2For 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 on
13、the ASTM website.3Available 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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive,
14、PO Box C700, West Conshohocken, PA 19428-2959, United States.3. Properties3.1 Low Toluene Low Dioxane (LTLD) Benzene shallconform to the following requirements:Property Specification ASTM TestMethodAPurity, min, weight % 99.80 D 4492Toluene, max, weight % 0.05 D 4492Sulfur, max, mg/kg (if needed) D
15、7183Thiophene, max, mg/kg 1.0 D 1685 or D 4735 orD 7011Nonaromatic hydrocarbons, max,weight %0.15 D 4492Nitrogen, max., mg/kg (if needed) D 6069 or D 7184Acid wash color, max pass with 1 D 848AppearanceB.Color, max, PtCo scale 20 D 1209 or D 53861,4 Dioxane, max, mg/kg 10 D 4492Solidification point,
16、 anhydrousbasis, min, C(if needed) D 852 or D 6875Water Content, max, mg/kg (if needed) D 6304 or D 7375Total Chlorides, max, mg/kg 1.0 D 5194 or D 5808_AIf more than one method is listed for a property, the producer and user shouldagree on the referee test method.BClear liquid free of sediment and
17、haze when observed at 18.3 to 25.6C (65 to78F).4. Sampling4.1 The material shall be sampled in accordance withPractice D 3437.5. Keywords5.1 benzene; dioxane; LTLD; tolueneSUMMARY OF CHANGESCommittee D16 has identified the location of selected changes to this standard since the last issue(D 7185 - 0
18、7) that may impact the use of this standard. (Approved December 1, 2008.)(1) Added Test Method D 7375 as an alternate method forwater.Committee D16 has identified the location of selected changes to this standard since the last issue(D 7185 - 06) that may impact the use of this standard. (Approved J
19、une 1, 2007.)(1) Changed method entry for sulfur in 3.1.(2) Changed method entry for nitrogen in 3.1.(3) Changed level for chlorides in 3.1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this
20、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 by the responsible technical committee and must be reviewed every five years
21、 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 receive careful consideration at a meeting of theresponsible technical committe
22、e, 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 International, 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).D7185082
