ASTM_D_5757_-_11.pdf

Designation:D575711Standard Test Method forDetermination of Attrition of FCC Catalysts by Air Jets1This standard is issued under the fixed designation D5757;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 determination of the relativeattrition characteristics of FCC catalysts by means of air jetattrition.Other fine powder catalysts can be analyzed by thistest method but the precision of this test method has beendetermined only for FCC catalysts.It is applicable to spheri-cally or irregularly shaped particles which range in sizebetween 10 and 180 m,have skeletal densities between 2.4and 3.0 g/cm3(2400 and 3000 kg/m3)(see IEEE/ASTM SI-10)and are insoluble in water.Particles less than 20 m areconsidered fines.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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:2E177 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 MethodIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units(SI):The Modern Metric System23.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 Air Jet Index(AJI)a unitless value numericallyequal to the percent attrition loss at 5 h.4.Summary of Test Method4.1 A sample of dried powder is humidified and attrited bymeans of three high velocity jets of humidified air.The finesare continuously removed from the attrition zone by elutriationinto a fines collection assembly.4.2 The AJI is calculated from the elutriated fines to give arelative estimate of the attrition resistance of the powderedcatalyst as may be observed in commercial use.5.Significance and Use5.1 This test method is intended to provide informationconcerning the ability of a powdered catalyst to resist particlesize reduction during use in a fluidized environment.5.2 This test method is suitable for specification acceptance,manufacturing control,and research and development pur-poses.6.Apparatus6.1 The air jet attrition system consists of the following:6.1.1 Attrition Tube,a stainless steel tube 710-mm long witha 35-mm inside diameter.NOTE1NPS 114-in.pipe,Schedule 40 has the appropriate insidediameter.6.1.2 Three 2-mm Long Drilled Sapphire Square EdgedNozzles,precision drilled 0.381 6 0.005 mm in diameter.Theyare mounted equidistant from each other,10 mm from centerand flush with the top surface in a circular orifice plate 6.4-mmthick.The plate is designed to be attached to the bottom of thevertical attrition tube within an air delivery manifold.6.1.3 Settling Chamber,a 300-mm long cylinder with a110-mm inside diameter and with conical ends reducing to30-mm inside diameter.The upper cone is approximately100-mm long and the lower cone is approximately 230-mmlong.The chamber is mounted to the top of the attrition tube.6.1.4 Fines Collection Assembly,made up of a 250-mLfiltering flask,an extraction thimble connected to the side armsof the flask,and a 200 by 13-mm diameter metal tubing bent toan angle of 125 connecting the top of the flask to the top of thesettling chamber.NOTE2The flask may be eliminated and the thimble connecteddirectly to the tubing if the attrition is expected to be low enough to avoidclogging the thimble and creating a backpressure in the settling chamber.1This test method is under the jurisdiction of ASTM Committee D32 onCatalysts and is the direct responsibility of Subcommittee D32.02 on Physical-Mechanical Properties.Current edition approved Nov.15,2011.Published December 2011.Originallyapproved in 1995.Last previous edition approved in 2006 as D575700(2006).DOI:10.1520/D5757-11.2For 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 6.1.5 Rubber Couplers and Seals,appropriately sized toensure tight and leak free connections of the system.6.2 Air Supply Source,controlled and capable of maintain-ing an air flow rate of 10.00 L/min stable to 0.05 L/min at apressure up to 200 kPa.The air must be at a relative humidityof 30 to 40%to minimize electrostatic effects.NOTE3The air may be bubbled