ASTM D5160 Standard Guide for Gas-Phase Adsorption Testing of Activated Carbon

Get Certified ASTM D5160 Gas-Phase Adsorption Testing

ASTM D5160 testing applies to activated carbon manufacturers, providers, engineers, environmental specialists, and quality assurance employees evaluating activated carbon for use in vapor and gas removal. Technicians identify and prepare representative activated carbon samples and establish the selected gas-stream conditions. They introduce the specified adsorbate into the gas stream and pass it through the activated carbon bed under controlled conditions. Analysts use the collected data to determine the applicable dynamic adsorption capacity and critical bed depth. This data helps engineers compare activated carbons and determine their suitability for a specific vapor or gas-removal process.

• Gas-Phase Adsorption: Evaluates activated carbon used to remove gases or vapors from gas streams.
• Dynamic Adsorption Capacity: Determines the adsorption capacity of activated carbon for a selected adsorbate under specified conditions.
• Critical Bed Depth: Determines the applicable critical depth of the activated carbon bed.
• Breakthrough Evaluation: Uses breakthrough behavior to evaluate the adsorption performance of the carbon bed.
• Material Comparison: Supports comparison of activated carbons under relevant operating conditions.
• Impregnated and Regenerated Carbon: Can also be applied to impregnated, reactivated, or regenerated activated carbons.

What are the uses of the ASTM D5160 guide?

ASTM D5160 provides gas-phase adsorption information that helps technical personnel evaluate the performance of activated carbon for a selected application. The guide helps to:

• Determine the dynamic adsorption capacity of activated carbon.
• Determine the critical bed depth for a selected adsorbate.
• Compare activated carbon materials under relevant conditions.
• Evaluate activated carbon for gas and vapor removal.
• Support activated carbon selection.
• Assist in evaluating adsorption-system performance.
• Support quality control and material evaluation.
• Provide information useful for adsorption-bed sizing and carbon selection.

Which materials can be tested according to ASTM D5160?

ASTM D5160 is for activated carbon materials tested for gas-phase adsorption. Technicians need to confirm the type of carbon, the adsorbate, the parameters of the gas stream, and the test requirements. The guide applies to:

• Activated Carbon: Evaluates applicable activated carbon used for gas-phase adsorption.
• Granular or Other Applicable Carbon Forms: Supports evaluation of activated carbon in forms suitable for the selected test arrangement.
• Impregnated Activated Carbon: Can be used to evaluate applicable carbon treated to improve the removal of certain gases.
• Reactivated or Regenerated Activated Carbon: Supports evaluation of applicable reactivated or regenerated carbon materials.
• Production Samples: Allows comparison of representative activated carbon samples from different production batches.

Why is ASTM D5160 testing important?

Activated carbon is used extensively to remove gases and vapors from air and other gas streams. The physical and chemical properties of the activated carbon can strongly affect the activated carbon’s ability to absorb a specific adsorbate. ASTM D5160 gives a controlled method of determining the dynamic adsorption properties under the conditions chosen to simulate the application. The outcome can assist engineers in deciding the appropriate activated carbon for adsorption properties and determining the critical activated carbon bed depth. When considering an adsorption system, the pressure drop and adsorption behavior should also be taken into account when comparing carbon materials.

ASTM D5160 Testing Process and Data Collection

Technicians start testing by identifying the activated carbon and preparing the required carbon bed. They establish the selected gas-stream conditions, including the applicable flow rate, adsorbate concentration, temperature, pressure, and other relevant parameters. The selected gas stream is passed through the activated carbon bed while technicians monitor the concentration of the adsorbate and determine the applicable breakthrough behavior. The procedure may be repeated with different quantities or bed depths of activated carbon as required for determining the adsorption characteristics. Technicians record the activated carbon information, gas-stream conditions, adsorbate concentration, breakthrough time, bed information, and other applicable observations. Analysts use the recorded measurements to determine the dynamic adsorption capacity and critical bed depth.

Common Challenges and Troubleshooting

Gas-flow irregularities, inconsistent adsorbate concentration, temperature and pressure fluctuations, humidity fluctuations, improper activation of the carbon bed, breach, errors in measurement, and equipment calibration errors can impact ASTM D5160 results. Technicians should prepare the representative activated carbon bed and carefully maintain the selected test conditions. They should also monitor and verify gas-flow control, adsorbate concentration, temperature, pressure, and the aerosol monitoring equipment before testing. If there are unexpected variations, they should reevaluate the activated carbon sample, carbon bed preparation, gas-stream composition, flow rate, adsorbate concentration, breakthrough measurement, equipment calibration, and other selected test conditions.

• ASTM D5160 produces adsorption-specific results rather than a single overall material-property value.
• Laboratories often report dynamic adsorption capacity (Nₒ) using the applicable SI-based mass or concentration relationship specified by the selected procedure, while critical bed depth is reported as a length in an SI unit, such as m or mm, as applicable.
• The report should include applicable test conditions such as gas flow rate, adsorbate concentration, temperature in °C, pressure in Pa or kPa, relative humidity in %, breakthrough time in s or min, and activated carbon bed dimensions in applicable SI units.
• Consistent carbon-bed preparation, controlled gas-stream conditions, accurate breakthrough measurement, and suitable calibrated equipment help technicians and analysts produce reliable and comparable results.

Link to ASTM D5160