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ASTM D6646-03(2022)

(Test Method)

Standard Test Method for Determination of the Accelerated Hydrogen Sulfide Breakthrough Capacity of Granular and Pelletized Activated Carbon

Standard Test Method for Determination of the Accelerated Hydrogen Sulfide Breakthrough Capacity of Granular and Pelletized Activated Carbon

SIGNIFICANCE AND USE
5.1 This method compares the performance of granular or pelletized activated carbons used in odor control applications, such as sewage treatment plants, pump stations, etc. The method determines the relative breakthrough performance of activated carbon for removing hydrogen sulfide from a humidified gas stream. Other organic contaminants present in field operations may affect the H2S breakthrough capacity of the carbon; these are not addressed by this test. This test does not simulate actual conditions encountered in an odor control application, and is therefore meant only to compare the hydrogen sulfide breakthrough capacities of different carbons under the conditions of the laboratory test.  
5.2 This test does not duplicate conditions that an adsorber would encounter in practical service. The mass transfer zone in the 23 cm column used in this test is proportionally much larger than that in the typical bed used in industrial applications. This difference favors a carbon that functions more rapidly for removal of H2S over a carbon with slower kinetics. Also, the 1 % H2S challenge gas concentration used here engenders a significant temperature rise in the carbon bed. This effect may also differentiate between carbons in a way that is not reflected in the conditions of practical service.  
5.3 This standard as written is applicable only to granular and pelletized activated carbons with mean particle diameters less than 2.5 mm. Application of this standard to activated carbons with mean particle diameters (MPD) greater than 2.5 mm will require a larger diameter adsorption column. The ratio of column inside diameter to MPD should be greater than 10 in order to avoid wall effects. In these cases it is suggested that bed superficial velocity and contact time be held invariant at the conditions specified in this standard (4.77 cm/s and 4.8 s). Although not covered by this standard, data obtained from these tests may be reported as in paragraph 12 along with additional ...
SCOPE
1.1 This test method is intended to evaluate the performance of virgin, newly impregnated or in-service, granular or pelletized activated carbon for the removal of hydrogen sulfide from an air stream, under the laboratory test conditions described herein. A humidified air stream containing 1 % (by volume) hydrogen sulfide is passed through a carbon bed until 50 ppm breakthrough of H2S is observed. The H2S adsorption capacity of the carbon per unit volume at 99.5 % removal efficiency (g H2S/cm3 carbon) is then calculated. This test is not necessarily applicable to non-carbon adsorptive materials.  
1.2 This standard as written is applicable only to granular and pelletized activated carbons with mean particle diameters (MPD) less than 2.5 mm. See paragraph 5.3 if activated carbons with larger MPDs are to be tested.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Aug-2022
ICS
19.020 - Test conditions and procedures in general
71.040.30 - Chemical reagents
Technical Committee
D28 - Activated Carbon
Drafting Committee
D28.04 - Gas Phase Evaluation Tests
Current Stage
Ref Project

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ASTM D6646-03(2022) - Standard Test Method for Determination of the Accelerated Hydrogen Sulfide Breakthrough Capacity of Granular and Pelletized Activated CarbonASTM D6646-03(2022) - Standard Test Method for Determination of the Accelerated Hydrogen Sulfide Breakthrough Capacity of Granular and Pelletized Activated Carbon
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ASTM D6646-03(2022) - Standard Test Method for Determination of the Accelerated Hydrogen Sulfide Breakthrough Capacity of Granular and Pelletized Activated Carbon
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D6646 −03 (Reapproved 2022)
Standard Test Method for
Determination of the Accelerated Hydrogen Sulfide
Breakthrough Capacity of Granular and Pelletized Activated
1
Carbon
This standard is issued under the fixed designation D6646; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D2854Test Method for Apparent Density of Activated
Carbon
1.1 Thistestmethodisintendedtoevaluatetheperformance
D2867Test Methods for Moisture in Activated Carbon
of virgin, newly impregnated or in-service, granular or pellet-
E300Practice for Sampling Industrial Chemicals
ized activated carbon for the removal of hydrogen sulfide from
an air stream, under the laboratory test conditions described
3. Terminology
herein. A humidified air stream containing 1% (by volume)
3.1 Terms relating to this standard are defined in D2652.
hydrogen sulfide is passed through a carbon bed until 50 ppm
breakthrough of H S is observed.The H S adsorption capacity
2 2 4. Summary of Test Method
of the carbon per unit volume at 99.5% removal efficiency (g
4.1 Breakthrough capacity is determined by passing a
3
H S/cm carbon) is then calculated.This test is not necessarily
2
stream of humidified air containing 1 volume% hydrogen
applicable to non-carbon adsorptive materials.
sulfide through a sample of granular or pelletized activated
1.2 This standard as written is applicable only to granular
carbon of known volume under specified conditions until the
and pelletized activated carbons with mean particle diameters
concentrationofhydrogensulfideintheeffluentgasreaches50
(MPD) less than 2.5 mm. See paragraph 5.3 if activated
ppmv.
carbons with larger MPDs are to be tested.
5. Significance and Use
1.3 This standard does not purport to address all of the
5.1 This method compares the performance of granular or
safety concerns, if any, associated with its use. It is the
pelletized activated carbons used in odor control applications,
responsibility of the user of this standard to establish appro-
such as sewage treatment plants, pump stations, etc. The
priate safety, health, and environmental practices and deter-
method determines the relative breakthrough performance of
mine the applicability of regulatory limitations prior to use.
activatedcarbonforremovinghydrogensulfidefromahumidi-
1.4 This international standard was developed in accor-
fied gas stream. Other organic contaminants present in field
dance with internationally recognized principles on standard-
operations may affect the H S breakthrough capacity of the
ization established in the Decision on Principles for the
2
carbon; these are not addressed by this test. This test does not
Development of International Standards, Guides and Recom-
simulate actual conditions encountered in an odor control
mendations issued by the World Trade Organization Technical
application, and is therefore meant only to compare the
Barriers to Trade (TBT) Committee.
hydrogen sulfide breakthrough capacities of different carbons
under the conditions of the laboratory test.
2. Referenced Documents
2
5.2 This test does not duplicate conditions that an adsorber
2.1 ASTM Standards:
D2652Terminology Relating to Activated Carbon wouldencounterinpracticalservice.Themasstransferzonein
the 23 cm column used in this test is proportionally much
larger than that in the typical bed used in industrial applica-
tions. This difference favors a carbon that functions more
1
This test method is under the jurisdiction of ASTM Committee D28 on
rapidly for removal of H S over a carbon with slower kinetics.
Activated Carbon and is the direct responsibility of Subcommittee D28.04 on Gas
2
Phase Evaluation Tests.
Also, the 1% H S challenge gas concentration used here
2
Current edition approved Sept. 1, 2022. Published October 2022. Originally
engendersasignificanttemperatureriseinthecarbonbed.This
approved in 2001. Last previous edition approved in 2014 as D6646– 03 (2014).
effect may also differentiate between carbons in a way that is
DOI: 10.1520/D6646-03R22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or not reflected in the conditions of practical service.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.3 This standard as written is applicable only to granular
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. and pelletized activated carbons with mean particle diameters
Copyright ©ASTM In
...

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SIGNIFICANCE AND USE
4.1 Regulatory Requirements—The USA Code of Federal Regulations (10CFR Part 50, Appendix H) requires the implementation of a reactor vessel materials surveillance program for all operating LWRs. Other countries have similar regulations. The purpose of the program is to (1) monitor changes in the fracture toughness properties of ferritic materials in the reactor vessel beltline6 resulting from exposure to neutron irradiation and the thermal environment, and (2) make use of the data obtained from surveillance programs to determine the conditions under which the vessel can be operated with adequate margins of safety throughout its service life. Practice E185, derived mechanical property data, and (r, θ, z) physics-dosimetry data (derived from the calculations and reactor cavity and surveillance capsule measurements (1) using physics-dosimetry standards) can be used together with information in Guide E900 and Refs. 4, 11-18 to provide a relation between property degradation and neutron exposure, commonly called a “trend curve.” To obtain this trend curve at all points in the pressure vessel wall requires that the selected trend curve be used together with the appropriate (r, θ, z) neutron field information derived by use of this guide to accomplish the necessary interpolations and extrapolations in space and time.  
4.2 Neutron Field Characterization—The tasks required to satisfy the second part of the objective of 4.1 are complex and are summarized in Practice E853. In doing this, it is necessary to describe the neutron field at selected (r, θ, z) points within the pressure vessel wall. The description can be either time dependent or time averaged over the reactor service period of interest. This description can best be obtained by combining neutron transport calculations with plant measurements such as reactor cavity (ex-vessel) and surveillance capsule or RPV cladding (in-vessel) measurements, benchmark irradiations of dosimeter sensor materials, and knowledge of th...
SCOPE
1.1 This guide establishes the means and frequency of monitoring the neutron exposure of the LWR reactor pressure vessel throughout its operating life.  
1.2 The physics-dosimetry relationships determined from this guide may be used to estimate reactor pressure vessel damage through the application of Practice E693 and Guide E900, using fast neutron fluence (E > 1.0 MeV and E > 0.1 MeV), displacements per atom (dpa), or damage-function-correlated exposure parameters as independent exposure variables. Supporting the application of these standards are the E853, E944, E1005, and E1018 standards, identified in 2.1.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Guide
    12 pages
    English language
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  • Guide
    12 pages
    English language
    sale 15% off