1、Designation:D708418Standard Test Method forDetermination of Bulk Crush Strength of Catalysts andCatalyst Carriers1This standard is issued under the fixed designation D7084;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of l
2、ast 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 bulk crushstrength of a bed of formed catalyst particles132to316in.(0.8to 4.8 m
3、m)in diameter and is intended to provide informationconcerning the ability of the catalyst material to maintainphysical integrity.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 info
4、rmation onlyand are not considered 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,health,and environmental practices and deter-mine the applicability
5、 of regulatory limitations prior to use.1.4 This international standard was developed in accor-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
6、Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3766 Terminology Relating to Catalysts and CatalysisD4180 Test Method for Vibratory Packing Density ofFormed Catalyst Particles and Catalyst CarriersE11 Specification for Woven Wire Test Sieve Clot
7、h and TestSievesE177 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:3.1.1 See also Terminology D3766.3.
8、1.2 bulk crush strengthpressure that generates 1%finesfor a sample contained in a cylindrical sample holder andcrushed with a piston.3.1.3 generated finesparticle size after crushing thatpasses through a sieve one-half of the diameter of the catalystpellet.4.Summary of Test Method4.1 Arepresentative
9、 sample is placed in a cylindrical sampleholder,which is fitted with a piston.The piston is allowed tocompress the catalyst at a known pressure.The percent ofgenerated fines is determined by sieving.5.Significance and Use5.1 This test method is a means of determining the crushingstrength of a cataly
10、st in a bed.Techniques to measure thecrushing strength of formed catalyst particles is limited tocrushing of individual particles,which may not be related tohow the catalyst will crush in a reactor or bed.For somecatalysts,such as granules,this technique may be the onlyviable method for obtaining cr
11、ushing strength.The productionof fines in a reactor is not desired because of the potential ofbed compaction and the pressure buildup in the reactor.6.Apparatus6.1 Hydraulic Press,capable of 3200 lb(1450 kg)loading,including a force gage.Maximum load capacity of the pressshould match with the accura
12、cy measuring the applied force.NOTE1Lower maximum load may be acceptable for testing lessstrong materials.6.2 U.S.Standard Sieves,in accordance with E11.6.3 Test Cell,(Fig.1).NOTE2A top loading cell can be used,but reproducibility of this testis a function of the volume being crushed and therefore t
13、he constantvolume cell,as shown in Fig.1,is recommended.A smaller l/d ratio for1This 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 May 1,2018.Published May 201
14、8.Originallyapproved in 2004.Last previous edition approved in 2017 as D708404(2017).DOI:10.1520/D7084-18.2For 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 D
15、ocument Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Pri
16、nciples for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 the cell will alter the results,and for certain applications,it may be moredesirable.3,46.4 Drying Oven.6.5 Balance,having a sensitivity of 0.1 g.6.6 Glass Cylinders,with 250-mL feed capacity.Measure inaccordance with Test Method D4180.6.7 Vibrator,conventional,handheld,with hard rubber ormetal impactor,in accordance with Test Method
