1、Designation: D 4512 03 (Reapproved 2008)Standard Test Method forVibrated Apparent Packing Density of Fine Catalyst andCatalyst Carrier Particles and Powder1This standard is issued under the fixed designation D 4512; the number immediately following the designation indicates the year oforiginal adopt
2、ion or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the appar-ent packing densi
3、ty of fine catalyst and catalyst carrier powderssmaller than 0.8 mm in diameter.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
4、 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:2D 3766 Terminology Relating to Catalysts and CatalysisE 177 Practice
5、 for Use of the Terms Precision and Bias inASTM Test MethodsE 456 Terminology Relating to Quality and StatisticsE 691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 DefinitionsSee Terminology D 3766.4. Significance and Use4.1 This test me
6、thod is for measuring the apparent packingdensity of catalyst or catalyst carrier powders that are smallerthan 0.8 mm in diameter.5. Apparatus5.1 Glass Cylinders, capacity 100 mL, feed and measuring.5.2 Vibrator,3conventional hand-held, with hard rubber ormetal impactor.5.3 Feed Funnel, plastic, gla
7、ss, or metal as shown in Fig. 1.5.4 Ring Stand, vibrator holder and clamps as shown inFigs. 2 and 3.5.5 Desiccator, with a desiccant grade molecular sieve suchas 4A.5.6 Balance, having sensitivity of 0.1 g.5.7 Drying Oven.6. Procedure6.1 Heat an adequate amount of sample(s) at 400 6 15Cfor not less
8、than 3 h. Normally, this treatment can take place inair; however, in the case of materials that might react with airat elevated temperatures (such as, prereduced catalysts) theheat treatment shall take place in an inert atmosphere. Afterheating, cool the test sample(s) in a desiccator or other suita
9、blecontainer to eliminate the possibility of moisture adsorptionprior to testing.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 April 1, 2008. Published A
10、pril 2008. Originallyapproved in 1985. Last previous edition approved in 2003 as D 451203.2For 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 Sum
11、mary page onthe ASTM website.3The sole source of supply of the Wahl, Model 4180, 4 in 1, 120 V60 Hz 11 Wknown to the committee at this time is Wahl Clipper Corp., Sterling, IL. If you areaware of alternative suppliers, please provide this information to ASTM Interna-tional Headquarters. Your comment
12、s will receive careful consideration at a meetingof the responsible technical committee,1which you may attend.FIG. 1 Feed Funnel1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.NOTE 1These conditions may not be appropriate for all mat
13、erials.NOTE 2Since many catalyst formulations are strong adsorbents, theuse of 4A indicating (cobalt-treated) molecular sieve as a desiccatingmedium is suggested. The desiccant should be regenerated at 493 K(220C) to 533 K (260C), as required.6.2 Fill a feed glass cylinder with 100 mLof loosely pack
14、ed,dried sample.6.3 Turn on the vibrator and carefully add sample(s) to thetared, measuring cylinder through the feed funnel.6.4 Transfer all of the sample to the measuring cylinder at auniform rate not less than 2 mL or exceeding 3 mL/s. Theentire transfer time shall be between 35 and 50 s.6.5 Afte
15、r 60 additional seconds turn off the vibrator. Readthe vibrated volume, V, to the nearest millilitre by estimatingthe average level of the sample surface in the cylinder.Immediately weigh the sample and cylinder to the nearest tenthof a gram.FIG. 2 Assembly of ApparatusFIG. 3 Vibrator HolderD 4512 0
16、3 (2008)27. Calculation7.1 Calculate the apparent packing density as follows:APD 5 W/V (1)where:APD = apparent packing density, g/mL,W = mass of sample particles, g, andV = volume occupied by sample particles in measuringcylinder, mL.7.2 Apparent packing densities are typically reported tothree sign
17、ificant figures.7.3 The average of two or more runs is to be reported.8. Precision and Bias48.1 Test ProgramAn interlaboratory study was conductedin which the named property was measured in two separate testmaterials in four separate laboratories. Practice E 691, modi-fied for nonuniform data sets,
18、was followed for the datareduction.8.2 PrecisionPairs of test results obtained by the proce-dure described in the method are expected to differ in absolutevalue by less than 2.772 S, where 2.772 S is the 95 %probability limit on the difference between two test results, andS is the appropriate estima
19、te of standard deviation. Definitionsand usage are given in Terminology E 456 and Practice E 177,respectively.Test Result(Consensus)95 % Repeatability Limit(Within Laboratory)95 % Reproducibility Limit(Between Laboratories)0.672 g/cm30.950 g/cm30.011 g/cm3(1.6 %)0.009 g/cm3(0.9 %)0.090 g/cm3(13.4 %)
20、0.062 g/cm3(6.6 %)8.3 BiasThe procedure described is without bias since theproperty measured is defined in terms of the procedure.9. Keywords9.1 apparent density; catalyst; densityASTM International takes no position respecting the validity of any patent rights asserted in connection with any item m
21、entionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committ
22、ee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meet
23、ing of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, P
24、O Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR: D32-1005.D 4512 03 (2008)3
