ASTM_D_3907_-_D_3907M_-_13.pdf

Designation:D3907/D3907M13Standard Test Method forTesting Fluid Catalytic Cracking(FCC)Catalysts byMicroactivity Test1This standard is issued under the fixed designation D3907/D3907M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers determining the activity ofequilibrium or laboratory-deactivated fluid catalytic cracking(FCC)catalysts,or both.This is evaluated on the basis ofweight percent conversion of gas oil in a microactivity unit.The selectivity of FCC catalysts can be determined using TestMethod D5154.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 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:2D2887 Test Method for Boiling Range Distribution of Pe-troleum Fractions by Gas ChromatographyD5154 Test Method for DeterminingActivity and Selectivityof Fluid Catalytic Cracking(FCC)Catalysts by Microac-tivity TestE105 Practice for Probability Sampling of MaterialsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 ASTM consensus mean conversioneach referencecatalyst has a consensus mean conversion value assigned to itby Committee D32(see 11.2).3.1.2 ASTM reference catalystsa set of equilibrium fluidcracking catalysts with conversions within the useful range ofthis test method is used to improve the reproducibility of testresults between different laboratories.Samples of the ASTMreference catalysts can be obtained from NIST.3.1.3 ASTM standard feeda specific batch of gas oil that isused as feedstock in the described test method.This standardfeed can be obtained from the National Institute of Standardsand Technology(NIST).33.1.4 conversion calibration curvea calibration curve canbe obtained by plotting the consensus mean conversion valuesfor the ASTM reference catalysts(see 11.2)versus the indi-vidual laboratory-measured conversion for the same catalysts.3.1.5 measured conversionis calculated as the differencebetween the weight of feed used and the weight of unconvertedmaterial,divided by the weight of feed used,times 100%.Theunconverted material is defined as all liquid product with aboiling point above 216C 421F.4.Summary of Test Method4.1 A sample of cracking catalyst in a fixed-bed reactor iscontacted with gas oil(ASTM standard feed).Cracked liquidproducts are analyzed for unconverted material and the con-version is calculated.4.2 A corrected conversion value can be obtained from themeasured conversion and the conversion calibration curve.5.Significance and Use5.1 The microactivity test provides data to assess the rela-tive performance of FCC catalyst.Because results are affectedby catalyst pretreatment,feedstock characteristics,testequipment,and operating parameters,adherence to this test1This test method is under the jurisdiction of ASTM Committee D32 onCatalysts and is the direct responsibility of Subcommittee D32.04 on CatalyticProperties.Current edition approved March 1,2013.Published March 2013.Originallyapproved in 1992.Last previous edition approved in 2008 as D390703(2008).DOI:10.1520/D3907_D3907M-13.2For 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.3Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 3460,Gaithersburg,MD 20899-3460.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 method is a prerequisite for correct interpretation of results.Apparatus,test conditions,and analytical procedures actuallyused should closely resemble those described in this testmethod.5.2 Caution should be used in interpreting results above 80weight%conversion due to the significance of overcracking.6.Apparatus6.1 Flow ChartThe flow chart is given in Fig.1.During75 s,gas oil from a syringe is forced over 4 g of catalyst in afixed-bed reactor.Liquid products are collected in a receiverand kept at a wet ice tempe