ASTM D4781-03(2013)
(Test Method)Standard Test Method for Mechanically Tapped Packing Density of Fine Catalyst Particles and Catalyst Carrier Particles
Standard Test Method for Mechanically Tapped Packing Density of Fine Catalyst Particles and Catalyst Carrier Particles
SIGNIFICANCE AND USE
5.1 This test method is for measuring the mechanically tapped packing density of powders that are smaller than 0.8 mm in diameter, such as Fluidized Catalytic Cracking Catalysts (FCC).
SCOPE
1.1 This test method covers the determination of the mechanically tapped packing density of fine catalyst and catalyst carrier particles smaller than 0.8 mm in diameter.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D4781 − 03 (Reapproved 2013)
Standard Test Method for
Mechanically Tapped Packing Density of Fine Catalyst
Particles and Catalyst Carrier Particles
This standard is issued under the fixed designation D4781; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Significance and Use
5.1 This test method is for measuring the mechanically
1.1 This test method covers the determination of the me-
tapped packing density of powders that are smaller than 0.8
chanically tapped packing density of fine catalyst and catalyst
mmindiameter,suchasFluidizedCatalyticCrackingCatalysts
carrier particles smaller than 0.8 mm in diameter.
(FCC).
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
6. Apparatus
standard.
6.1 Graduated Cylinder, capacity 100 mL.
1.3 This standard does not purport to address all of the
6.2 Holder, acylinder holder weighing 454 g.
safety concerns, if any associated with its use. It is the
responsibility of the user of this standard to establish appro-
6.3 Tapping Device, consisting of a baseplate with worm
priate safety and health practices and determine the applica-
drive, with specifications of 250 r/min camshaft speed, tapping
bility of regulatory limitations prior to use.
stroke travel of 3.2 mm.
6.4 Counter, a four-digit adjustable counter, which can be
2. Referenced Documents
preset to deliver number of taps between 1 and 9999.
2.1 ASTM Standards:
6.5 Desiccator, with a desiccant grade molecular sieve such
D3766 Terminology Relating to Catalysts and Catalysis
as 4A.
E177 Practice for Use of the Terms Precision and Bias in
6.6 Balance, having a sensitivity of 0.1 g.
ASTM Test Methods
E456 Terminology Relating to Quality and Statistics
6.7 Drying Oven.
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method 7. Procedure
7.1 Heatanadequatesampleat400 615°Cfornotlessthan
3. Terminology
3 h. Normally, this treatment can take place in air. However, in
the case of materials that might react with air at elevated
3.1 Definitions—See Terminology D3766.
temperature (such as prereduced catalysts) the heat treatment
should take place in an inert atmosphere. After heating, cool
4. Summary of Test Method
the test sample in a desiccator or other suitable container to
4.1 A preconditioned sample of dried fine catalyst or cata-
eliminate the possibility of moisture adsorption prior to testing.
lyst carrier particles is tapped in a graduated cylinder. The
NOTE 1—These conditions may not be appropriate for all materials.
mechanically tapped packing density is determined from the
NOTE 2—Since many catalyst formulations are strong adsorbents, the
known mass and tapped volume.
use of 4A indicating (cobalt-treated) molecular sieves as a desiccating
medium is recommended. The desiccant should be regenerated at 220 to
260°C, as required.
NOTE 3—Multiple samples can be pretreated but must be desiccated
This test method is under the jurisdiction of ASTM Committee D32 on
prior to analysis.
Catalysts and is the direct responsibility of Subcommittee D32.02 on Physical-
Mechanical Properties.
7.2 Carefully pour between 90 and 100 mL of the test
Current edition approved March 1, 2013. Published March 2013. Originally
specimen into the tared-graduated cylinder using a funnel. To
approved in 1988. Last previous edition approved in 2008 as D4781–03(2008).
ensure proper level, r
...
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