ASTM D5757-00

Standard Test Method for Determination of Attrition and Abrasion of Powdered Catalysts by Air Jets

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 um, have skeletal densities between 2.4 and 3.0 g/cm3 (2400 and 3000 kg/m3) and are insoluble in water. Particles less than 20 um are considered fines.  
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.

General Information

• Status: Historical
• Publication Date: 09-Oct-2000
• ICS: 71.040.30 - Chemical reagents
• Technical Committee: D32 - Catalysts
• Drafting Committee: D32.02 - Physical-Mechanical Properties

Relations

• Replaced By: ASTM D5757-00(2006) - Standard Test Method for Determination of Attrition and Abrasion of Powdered Catalysts by Air Jets
• Effective Date: 01-Oct-2006

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
Designation:D5757–00
Standard Test Method for
Determination of Attrition and Abrasion of Powdered
Catalysts by Air Jets
This standard is issued under the fixed designation D 5757; 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.
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 3000
5. Significance and Use
kg/m ) (see IEEE/ASTM SI-10) and are insoluble in water.
5.1 This test method is intended to provide information
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
6.1 The air jet attrition system consists of the following:
2.1 ASTM Standards:
6.1.1 Attriting Tube, a stainless steel tube 710 mm long with
E 177 Practice for the Use of the Terms Precision and Bias
2 a 35 mm inside diameter.
in ASTM Test Methods
E 456 Terminology Relating to Quality and Statistics
NOTE 1—NPS 1 ⁄4-in. pipe, Schedule 40 has the appropriate inside
E 691 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 attriting 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 110
equal to the percent attrition loss at 5 h.
mm inside diameter and with conical ends reducing to 30 mm
inside diameter.The upper cone is approximately 100 mm long
4. Summary of Test Method
and the lower cone is approximately 230 mm long. The
4.1 A sample of dried powder is humidified and attrited by
chamber is mounted to the top of the attriting 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
1 anangleof125°connectingthetopoftheflasktothetopofthe
This test method is under the jurisdiction of ASTM Committee D32 on
Catalysts and is the direct responsibility of Subcommittee D32.02 on Physical- settling chamber.
Mechanical Properties.
NOTE 2—The flask may be eliminated and the thimble connected
Current edition approved Oct. 10, 00. Published October 2000. Originally
directly to the tubing if the attrition is expected to be low enough to avoid
published as D 5757 - 95. Last previous edition D 5757- 95.
Annual Book of ASTM Standards, Vol 14.02. clogging the thimble and creating a backpressure in the settling chamber.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
D5757–00
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
of 30 to 40 % to minimize electrostatic effects. 9. Procedure
9.1 Weigh the first conditioned fines collection assembly to
NOTE 3—The air may be bubbled through a 0.25 m column of
deionized water at ambient temperature to obtain the required humidity. the nearest 0.01 g and record its mass.
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 first fines
6.6 Muffle Furnace.
colle
...