1、Designation: D4512 03 (Reapproved 2013)Standard Test Method forVibrated Apparent Packing Density of Fine Catalyst andCatalyst Carrier Particles and Powder1This standard is issued under the fixed designation D4512; the number immediately following the designation indicates the year oforiginal adoptio
2、n 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 appar-ent packing density
3、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 it
4、s 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 Terminology Relating to Catalysts and CatalysisE177 Practice for
5、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 DefinitionsSee Terminology D3766.4. Significance and Use4.1 This test method is
6、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, glass, or m
7、etal 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 than 3 h
8、. 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 suitableconta
9、iner to eliminate the possibility of moisture adsorptionprior to testing.NOTE 1These conditions may not be appropriate for all materials.NOTE 2Since many catalyst formulations are strong adsorbents, theuse of 4A indicating (cobalt-treated) molecular sieve as a desiccatingmedium is suggested. The des
10、iccant should be regenerated at 493 K(220C) to 533 K (260C), as required.6.2 Fill a feed glass cylinder with 100 mLof loosely packed,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 measuri
11、ng 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 After 60 additional seconds turn off the vibrator. Readthe vibrated volume, V, to the nearest millilitre by estimating1This test method is under the jurisdiction of ASTM Comm
12、ittee D32 onCatalysts and is the direct responsibility of Subcommittee D32.02 on Physical-Mechanical Properties.Current edition approved March 1, 2013. Published March 2013. Originallyapproved in 1985. Last previous edition approved in 2008 as D451203(2008).DOI: 10.1520/D4512-03R13.2For referenced A
13、STM 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.3The sole source of supply of the Wahl, Model 4180, 4 in 1, 120 V60 Hz 11 Wkno
14、wn 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 comments will receive careful consideration at a meetingof the responsible technical committee,1which you may atte
15、nd.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1the average level of the sample surface in the cylinder.Immediately weigh the sample and cylinder to the nearest tenthof a gram.7. Calculation7.1 Calculate the apparent packing densit
16、y 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 significant figures.7.3 The average of two or more runs is to be rep
17、orted.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 E691, modifiedfor nonuniform data sets, was followed for the data reduction.8.2 PrecisionPairs of test resu
18、lts 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 estimate of standard deviation. Definitionsand usage are given in Termin
19、ology E456 and Practice E177,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 %)0.062 g/cm3(6.6 %)8.3 BiasThe procedure described is without bias si
20、nce theproperty measured is defined in terms of the procedure.9. Keywords9.1 apparent density; catalyst; density4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D32-1005.FIG. 1 Feed FunnelD4512 03 (2013)2FIG. 2 Assembly of Appara
21、tusFIG. 3 Vibrator HolderD4512 03 (2013)3ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and th
22、e riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision o
23、f this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should
24、make 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, PO 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D4512 03 (2013)4
