ASTM D5757-00(2006)
(Test Method)Standard Test Method for Determination of Attrition and Abrasion of Powdered Catalysts by Air Jets
Standard Test Method for Determination of Attrition and Abrasion of Powdered Catalysts by Air Jets
SIGNIFICANCE AND USE
This test method is intended to provide information concerning the ability of a powdered catalyst to resist particle size reduction during use in a fluidized environment.
This test method is suitable for specification acceptance, manufacturing control, and research and development purposes.
SCOPE
1.1 This test method covers the determination of the relative attrition characteristics of powdered catalysts by means of air jet attrition. It is applicable to spherically or irregularly shaped particles which range in size between 10 and 180 m, have skeletal densities between 2.4 and 3.0 g/cm3 (2400 and 3000 kg/m3) (see IEEE/ASTM SI-10) and are insoluble in water. Particles less than 20 m are considered fines.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D5757–00 (Reapproved 2006)
Standard Test Method for
Determination of Attrition and Abrasion of Powdered
Catalysts by Air Jets
This standard is issued under the fixed designation D5757; 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 are continuously removed from the attrition zone by elutriation
into a fines collection assembly.
1.1 This test method covers the determination of the relative
4.2 The AJI is calculated from the elutriated fines to give a
attrition characteristics of powdered catalysts by means of air
relative estimate of the attrition resistance of the powdered
jet attrition. It is applicable to spherically or irregularly shaped
catalyst as may be observed in commercial use.
particles which range in size between 10 and 180 µm, have
skeletal densities between 2.4 and 3.0 g/cm (2400 and
5. Significance and Use
3000 kg/m ) (see IEEE/ASTM SI-10) and are insoluble in
5.1 This test method is intended to provide information
water. Particles less than 20 µm are considered fines.
concerning the ability of a powdered catalyst to resist particle
1.2 This standard does not purport to address all of the
size reduction during use in a fluidized environment.
safety concerns, if any, associated with its use. It is the
5.2 This test method is suitable for specification acceptance,
responsibility of the user of this standard to establish appro-
manufacturing control, and research and development pur-
priate safety and health practices and determine the applica-
poses.
bility of regulatory limitations prior to use.
6. Apparatus
2. Referenced Documents
2 6.1 The air jet attrition system consists of the following:
2.1 ASTM Standards:
6.1.1 Attrition Tube,astainlesssteeltube710-mmlongwith
E177 Practice for Use of the Terms Precision and Bias in
a 35-mm inside diameter.
ASTM Test Methods
E456 Terminology Relating to Quality and Statistics
NOTE 1—NPS 1 ⁄4-in. pipe, Schedule 40 has the appropriate inside
E691 Practice for Conducting an Interlaboratory Study to diameter.
Determine the Precision of a Test Method
6.1.2 Three 2-mm Long Drilled Sapphire Square Edged
IEEE/ASTM SI-10 Standard for Use of the International
Nozzles, precision drilled 0.381 6 0.005 mm in diameter.They
System of Units (SI): The Modern Metric System
are mounted equidistant from each other, 10 mm from center
and flush with the top surface in a circular orifice plate 6.4-mm
3. Terminology
thick. The plate is designed to be attached to the bottom of the
3.1 Definitions of Terms Specific to This Standard:
vertical attrition tube within an air delivery manifold.
3.1.1 Air Jet Index (AJI)—a unitless value numerically
6.1.3 Settling Chamber, a 300-mm long cylinder with a
equal to the percent attrition loss at 5 h.
110-mm inside diameter and with conical ends reducing to
30-mm inside diameter. The upper cone is approximately
4. Summary of Test Method
100-mm long and the lower cone is approximately 230-mm
4.1 A sample of dried powder is humidified and attrited by
long. The chamber is mounted to the top of the attrition tube.
means of three high velocity jets of humidified air. The fines
6.1.4 Fines Collection Assembly, made up of a 250-mL
filtering flask, an extraction thimble connected to the side arms
of the flask, and a 200 by 13-mm diameter metal tubing bent to
This test method is under the jurisdiction of ASTM Committee D32 on
Catalysts and is the direct responsibility of Subcommittee D32.02 on Physical-
anangleof125°connectingthetopoftheflasktothetopofthe
Mechanical Properties.
settling chamber.
Current edition approved Oct. 1, 2006. Published November 2006. Originally
approved in 1995. Last previous edition approved in 2000 as D5757–00. DOI:
NOTE 2—The flask may be eliminated and the thimble connected
10.1520/D5757-00R06.
directly to the tubing if the attrition is expected to be low enough to avoid
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
clogging the thimble and creating a backpressure in the settling chamber.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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D5757–00 (2006)
6.1.5 Rubber Couplers and Seals, appropriately sized to 8.4 Prepare two fines collection assemblies and condition
ensure tight and leak free connections of the system. the thimbles by installing them on the apparatus in succession
6.2 Air Supply Source, controlled and capable of maintain- andpassingthehumidifiedairthroughtheapparatusfor30min
ing an air flow rate of 10.00 L/min stable to 0.05 L/min at a each.
pressure up to 200 kPa. The air must be at a relative humidity
9. Procedure
of 30 to 40 % to minimize electrostatic effects.
9.1 Weigh the first conditioned fines collection assembly to
NOTE 3—The air may be bubbled through a 0.25-m column of
the nearest 0.01 g and record its mass.
deionized water at ambient temperature to obtain the required humidity.
9.2 With the air flowing at the prescribed 10.00 L/min and
6.3 Diaphragm-Type Test Meter (dry test meter) or Liquid-
the fines collection assembly off, charge 50 g of water
Sealed Rotating Drum Meter (wet test meter), minimum
equilibrated sample to the apparatus through the top of the
capacity of 30 L/min and maximum scale subdivision of 0.1 L.
settling chamber, quickly secure the first fines collection
6.4 Balance, 400-g capacity open pan with 0.01-g sensitiv-
assembly to the apparatus and start the timekeeping.
ity.
9.3 Weigh the second conditioned fines collection assembly
6.5 Desiccator, with a desiccant grade molecular sieve such
to the nearest 0.01 g and record its mass.
as 4A.
9.4 After exactly 1 h from the start, replace the
...
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