1、Designation:D418013Standard Test Method forVibratory Packing Density of Formed Catalyst Particles andCatalyst Carriers1This standard is issued under the fixed designation D4180;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、 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 vibra-tory packing density of formed catalyst and catalyst carriers.Fo
3、r the purpose of this test,catalyst particles are defined asextrudates,spheres,or formed pellets of 0.8 to 4.8-mm(132to316-in.)nominal diameter.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 This standard does not purpo
4、rt 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:2D3766 Te
5、rminology Relating to Catalysts and CatalysisE177 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 MethodE1272 Specification for Laboratory
6、Glass Graduated Cylin-ders3.Terminology3.1 DefinitionsSee Terminology D3766.4.Summary of Test Method4.1 A preconditioned sample of formed catalyst or catalystcarrier is vibrated in a cylinder.The vibratory packing densityis determined from a known mass and vibrated volume.5.Significance and Use5.1 T
7、his test method is to be used for measuring thevibratory packing density of formed particles that will notbreak up during sampling,filling,or vibrating of the measuringcylinder under test conditions.6.Apparatus6.1 Glass Cylinders,capacity 250 mL,feed and measuring,conforming to Specification E1272,C
8、lass A.6.2 Vibrator,3conventional handheld,with hard rubber ormetal impactor.6.3 Feed Funnel,plastic,glass,or metal as shown in Fig.1.6.4 Ring Stand,Vibrator Holder and Clamps as shown inFigs.2 and 3.6.5 Desiccator,with a desiccant grade molecular sieve suchas a No.4A.6.6 Balance having sensitivity
9、of 0.1 g.6.7 Drying Oven.7.Procedure7.1 Heat an adequate sample(s)at 400 6 15C for not lessthan 3 h.Normally,this treatment can take place in air.However,in the case of materials that might react with air atelevated temperatures(such as prereduced catalysts)the heattreatment should take place in an
10、inert atmosphere.Cool afterheating the test sample(s)in a desiccator or other suitablecontainer to eliminate the possibility of moisture adsorptionprior to testing.NOTE1These conditions may not be appropriate for all materials.NOTE2Since many catalyst formulations are strong adsorbents,theuse of a N
11、o.4A indicating(cobalt-treated)molecular sieve as a desiccat-ing medium is suggested.The desiccant should be regenerated at 220 to260C as required.1This test method is under the jurisdiction of ASTM Committee D32 onCatalysts and is the direct responsibility of Subcommittee D32.02 on Physical-Mechani
12、cal Properties.Current edition approved Dec.1,2013.Published December 2013.Originallyapproved in 1988.Last previous edition approved in 2008 as D4180 03(2008).DOI:10.1520/D4180-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.Fo
13、r Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The sole source of supply of the vibrator known to the committee at this timeis Wahl Clipper Corp.,Sterling,IL.Model 4120 used at low speed is recommendedto replace Model 4180,which is
14、discontinued.If you are aware of alternativesuppliers,please provide this information to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box
15、 C700,West Conshohocken,PA 19428-2959.United States1 7.2 Fill a tared feed-glass cylinder with 250 mL of looselypacked,dried catalyst and weigh immediately to the nearest0.1 g.7.3 Turn on the vibrator and carefully add the sample(s)tothe measuring cylinder through the feed funnel.7.4 Transfer all th
16、e catalyst to the measuring cylinder at auniform rate not less than 2 mL/s or exceeding 3 mL/s.Theentire transfer time should be between 83 and 125 s.7.5 After an additional 60 s turn off vibrator.Read thevibrated volume,V,to the nearest 1 mL by estimating theaverage level of the catalyst surface in the cylinder.8.Calculation8.1 Calculate the vibratory packing density VPD as follows:VPD5 W/Vwhere:W=mass of catalyst particles,g,andV=volume occupied by catalyst particles in measuringcylinder,mL.8.
