1、Designation:D575722Standard 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
2、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
3、 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 gcm3(2400 and 3000
4、kg m3)(see IEEE/ASTM SI-10)and are insoluble in water.Particles less than 20 m areconsidered fines.(See Terminology D3766.)1.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all
5、 of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in acco
6、r-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM St
7、andards:2D3766 Terminology Relating to Catalysts and CatalysisE105 Guide 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
8、the Precision of a Test MethodIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units(SI):The Modern Metric System3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 Air Jet Index(AJI),na unitless value numericallyequal to the percent attrition loss at 5 h.4.Summary of
9、 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 est
10、imate 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 te
11、st 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 114in.pipe,Schedule 40 ha
12、s 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 a
13、ttached 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 approximately1This test method is under the jurisdiction of ASTM Com
14、mittee D32 onCatalysts and is the direct responsibility of Subcommittee D32.02 on Physical-Mechanical Properties.Current edition approved Oct.1,2022.Published October 2022.Originallyapproved in 1995.Last previous edition approved in 2017 as D5757 11(2017).DOI:10.1520/D5757-22.2For referenced ASTM st
15、andards,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
16、-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1100 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 mL
