ASTM D4699-99
(Test Method)Standard Test Method for Vibratory Packing Density of Large Formed Catalyst and Catalyst Particles
Standard Test Method for Vibratory Packing Density of Large Formed Catalyst and Catalyst Particles
SCOPE
1.1 This test method covers the determination of the vibratory packing density of formed catalyst and catalyst carrier particles that will not break up significantly under test conditions. For the purpose of this test, catalyst particles are defined as extrudates, spheres or formed pellets greater than 4.8 mm ( 3/16 in.).
1.2 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.
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Designation: D 4699 – 99
Standard Test Method for
Vibratory Packing Density of Large Formed Catalyst and
Catalyst Carrier Particles
This standard is issued under the fixed designation D 4699; 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 (e) indicates an editorial change since the last revision or reapproval.
3,5
1. Scope 5.2 Vibratory Plate.
5.3 Desiccator, with a desiccant grade molecular sieve such
1.1 This test method covers the determination of the vibra-
as 4A.
tory packing density of formed catalyst and catalyst carrier
5.4 Balance having a sensitivity of 1.0 g.
particles that will not break up significantly under test condi-
5.5 Balance having a sensitivity of 0.1 g.
tions. For the purpose of this test, catalyst particles are defined
5.6 Drying Oven.
as extrudates, spheres or formed pellets greater than 4.8 mm
( ⁄16in.).
6. Procedure
1.2 This standard does not purport to address all of the
6.1 Equilibrate test sample to laboratory environment for 4
safety concerns, if any, associated with its use. It is the
h.
responsibility of the user of this standard to establish appro-
6.2 Pour between 1000 to 2000 mL of the test specimen
priate safety and health practices and determine the applica-
carefully into a tared beaker and weigh to the nearest 1 g.
bility of regulatory limitations prior to use.
Record as W.
2. Referenced Documents 6.3 Separately weigh to the nearest tenth of a gram about
100 g of additional test sample, W , that will be used for
2.1 ASTM Standards: I
moisture loss. Heat this sample at 673 K (400°C ) 6 15 K for
E 177 Practice for Use of the Terms Precision and Bias in
2 not less than 3 h. Normally, this treatment can take place in air;
ASTM Test Methods
however, in the case of materials that might react with air at
E 456 Terminology Relating to Quality and Statistics
elevated temperature (such as prereduced catalysts) the heat
E 691 Practice for Conducting an Interlaboratory Study to
treatment should take place in an inert atmosphere. After
Determine the Precision of a Test Method
heating, cool the test sample in a desiccator or other suitable
3. Summary of Test Method
container to eliminate the possibility of moisture adsorption
prior to weighing. Weigh the sample to the nearest tenth of a
3.1 A known sample of environmentally equilibrated
gram, W .
formed catalyst or catalyst carrier particles is vibrated in a H
graduated cylinder. The vibratory packing density is deter-
NOTE 1—The conditions may not be appropriate for all materials.
mined for a specified drying condition.
NOTE 2—Since many catalyst formulations are strong adsorbents, the
use of a 4A indicating (cobalt-treated) molecular sieve as a desiccating
4. Significance and Use
medium is recommended. The desiccant should be regenerated at 493 K
(220°C) to 533 K (260°C), as required.
4.1 This test method is used for measuring the vibratory
NOTE 3—Multiple samples can be pretreated but must be desiccated
packing density of formed particles used in fixed bed reactors,
prior to analysis.
driers, etc.
6.4 Clamp the cylinder to the vibratory plate (see example
5. Apparatus
Fig. 1).
3,4
6.5 Start vibrator at a setting at the midpoint of the rheostat
5.1 Graduated Cylinder, capacity 2000-mL.
range and pour the 1000 to 2000-mL test specimen carefully
into the graduated cylinder using a funnel. The entire transfer
This test method is under the jurisdiction of ASTM Committee D-32 on
time should be between 90 and 120 s. Those vibrating plate
Catalysts and is the direct responsibility of Subcommittee D 32.02 on Physical-
machines that operate at a frequency other than 60 Hz will
Mechanical Properties.
require appropriate adjustment of the vibrating time.
Current edition approved Oct. 10, 1999. Published December 1999. Originally
published as D 4699 – 87. Last previous edition D 4699 – 94. 6.6 Continue vibrating for 5 min.
Annual Book of ASTM Standards, Vol 14.02.
6.7 When vibration is completed, read the packed volume,
If
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