ASTM_D_7662_-_15.pdf

Designation:D766215Standard Test Method forCarbon Content in Carbon Black Feedstock Oils1This standard is issued under the fixed designation D7662;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.Scope1.1 This test method covers the instrumental determinationof carbon content in samples of carbon black feedstock oils.Values obtained represent the total carbon content.1.2 This test method is applicable to carbon black feedstockoils derived from petroleum,coal,and other sources whichinclude fuel oils,residues,tars,pitches,reclaimed oils,andsimilar materials that are normally handled as liquids.This testmethod is applicable to products that typically contain 75 to 94mass%carbon.1.3 The results of these tests can be expressed as mass%carbon.1.4 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesD7633 Test Method for Carbon BlackCarbon Content3.Summary of Test Method3.1 In this test method,a sample of feedstock oil is weighedin a combustion boat containing a tungsten oxide basedaccelerator and the carbon content is determined by placing theboat in a tube furnace at 1350C in an air-or oxygen-enrichedatmosphere resulting in complete combustion.Carbon in thesample is completely oxidized to carbon dioxide.Moisture andparticulates are removed from the gas stream by traps filledwith anhydrous magnesium perchlorate.The gas stream is thenpassed through a cell in which carbon dioxide concentration ismeasured by an infrared(IR)absorption detector at a precisewavelength in the IR spectrum.3.2 This test method is for use with commercially availablecarbon analyzers equipped to carry out the combustion andmeasurement operations automatically.3.3 The carbon analyzer shall be calibrated using an appro-priate calibration standard(see 6.5).3.4 The instrument may be configured to analyze more thanone element such as a carbon-sulfur analyzer.In this case,theanalyzer has individual detectors for each element that arearranged in series.4.Significance and Use4.1 Measuring the total carbon content of feedstock oil isoften a necessary component in calculations for carbon dioxideemissions,estimating yield of a process,or assessing productquality.4.2 The carbon black industry measures carbon content offeedstock oils along with carbon content of carbon blackproducts per Test Method D7633 for Carbon Black-CarbonContent in calculations to determine carbon dioxide emissionsfor compliance with governmental greenhouse-gas-reportingrequirements.5.Apparatus5.1 There are a number of commercial instruments availablethat are designed to measure carbon content in organic mate-rials including carbon and carbon-sulfur analyzers.This testmethod makes no specifications regarding system designs.5.2 Functionally,however,the following are specified for allinstruments:1This test method is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct responsibility of Subcommittee D24.66 on Environment,Health,and Safety.Current edition approved June 15,2015.Published September 2015.Originallyapproved in 2010.Last previous edition approved in 2013 as D7662 13.DOI:10.1520/D7662-15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2.1 An analytical balance,or equivalent,that is capable ofa weighing sensitivity of 0.1 mg or better resolution.5.2.2 The combustion tube and boat are made of a suitablematerial such as mullite,porcelain,or zircon.5.2.3 The sample is absorbed onto tungsten oxide basedaccelerator to control the sample combustion rate.5.2.4 The sample is combusted at a temperature of 1350Cin an air-or oxygen-enriched atmosphere.5.2.5 The combustion gas is passed through an absorbent(anhydrous magnesium perchlorate)to remove water vapor.5.2.6 The detection system measures carbon dioxide usingan IR absorption detector at a wavelength suitable for linearresponses wi