ASTM_D_5154_-_10.pdf

Designation:D515410Standard Test Method forDetermining Activity and Selectivity of Fluid CatalyticCracking(FCC)Catalysts by Microactivity Test1This standard is issued under the fixed designation D5154;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 determining the activity andselectivity of either equilibrium or laboratory deactivated fluidcatalytic cracking(FCC)catalysts.The activity is evaluated onthe basis of mass percent conversion of gas oil in a microac-tivity unit.The selectivities are evaluated on the basis of masspercent yields of specifically defined products resulting fromthe catalytic cracking of gas oil.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.2.1 ExceptionSI units have been retained in some of thefigures.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 ChromatographyD3907 Test Method for Testing Fluid Catalytic Cracking(FCC)Catalysts by Microactivity TestD4463 Guide for Metals Free Steam Deactivation of FreshFluid Cracking CatalystsE105 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 activitycalculated as conversion divided by the dif-ference of 100 minus conversion.3.1.2 ASTM reference catalystsa set of equilibrium FCCcatalysts within the useful range of this test method is used toimprove the reproducibility of test results between differentlaboratories.Each catalyst has a consensus mean conversionvalue assigned to it by Committee D32.Samples of the ASTMreference catalysts can be obtained through NIST.3.1.3 ASTM standard feeda specific batch of gas oil that isused as feedstock in the described test method.33.1.4 catalyst/oil(C/O)ratiothe mass of catalyst used inthe test divided by the mass of feed fed to the reactor.Inpractice,the mass of catalyst is usually maintained at aconstant value and the total mass of feed is varied.3.1.5 contact timecalculated as 3600/(WHSV C/O).Thisis the delivery time,in seconds,during which feed is intro-duced to the reactor.3.1.6 HCOthe heavy cycle oil product defined to have aminimum boiling point of 650F(343C).3.1.7 LCOthe light cycle oil product defined to have aboiling point range of 421 to 650F(216 to 343C).3.1.8 measured conversioncalculated as the differencebetween the mass of feed used and the mass of unconvertedmaterial divided by the mass of feed used times 100%.Theunconverted material is defined as all liquid product with aboiling point above 42F(216C).3.1.9 normalized product yieldthe result obtained wheneach product yield has been corrected for non-perfect massbalances.For a run to be judged acceptable,the total recovery,wt%of feed,should be in the range of 96 to 101%prior tonormalization.If the recovery is outside this range the test datashould be discarded.1This 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 April 1,2010.Published May 2010.Originallyapproved in 1991.Last previous edition approved in 2005 as D515405.DOI:10.1520/D5154-10.2For 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 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.10 product yieldone hundred times the mass of aspecific product divided by the mass of feed used in the test.3.1.11 reaction severityan indication of the severity of thecracking reaction which allows a range of conversions to beobtained from any particular catalyst without changing reactortemperature.Changing reaction severity is achieved by chang-ing WHSV or C/O ratio or both.3.1.12 weight hourly space velocity(WHSV)the oil feedrate in