adsorbent services | performance monitoring | extraction | sieving | changeout | replacement

adsorbent services
performance monitoring, extraction, sieving, reactivation, replacement

DEC SERVICE offers a complete range of services related to AAS™ • adsorbents (activated carbon, molecular sieves), ensuring you can access the expertise and resources necessary to achieve in maintaining optimal performance and maximizing the lifespan of your adsorbent beds.

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Adsorbent Performance Monitoring

Regular monitoring is vital for ensuring your adsorbent remains effective. Here are some key parameters to track:

Pressure Drop: as the adsorbent alternates cycles of adsorption and desorption, the pressure drop across the bed increases. Monitoring this rise can indicate powder formation and the need for adsorbent sieveing.

Fouling: over time, the adsorbent may retain molecules with high desorption temperatures (HHB) that standard regeneration cycles cannot remove. While less sensitive in Temperature Swing Adsorption (TSA), fouling significantly impacts Temperature Swing Adsorption with Vacuum Assist (T+VSA) adsorbent regeneration processes. As fouling progresses, the adsorption capacity and overall SRU process performance will decrease. Monitoring fouling helps determine the need for adsorbent reactivation or complete changeout.

Adsorbent Analytics

Regular analysis is vital for ensuring your adsorbent status. Here are some services offered by our internal infrastructure DEC LAB:

physical tests;

hardness;

mesh size.

adsorption tests;

adsorption properties (CTC index);

thermogravimetric analysis: TGA plays a crucial role in monitoring the performances of the adsorbents. TGA is an analytical technique that measures the change in mass of a sample as it's heated. In the context of adsorbent reactivation, TGA helps determine the extent of weight loss at the different temperatures providing valuable insights into the level of capacity restoration achievable through reactivation and contributing to a more sustainable adsorbent service program.

chemical tests.

Adsorbent Extraction, Screening and Sieving

When the adsorption efficiency falls below the design performance levels, the adsorbent must be removed from the adsorption system for maintenance. Here are the basic steps:

adsorbent extraction and screening: a vacuum conveyor creates negative pressure, drawing the exhausted adsorbent out of the adsorber and into a collection hopper. A cyclone separator, positioned within the extraction system, removes the fines or small particles that could hinder downstream processes.

adsorbent sieving: when the extracted adsorbent is intended for reuse or reactivation, sieving becomes an essential step. Thanks to a dedicated equipment (such as vibratory screens or rotary sifters) the adsorbent is passing across a mesh, allowing smaller particles to pass through while retaining usable-sized particles. The original quantity or volume of the adsorbent is then integrated with new adsorbent.

Adsorbent Reactivation

For certain adsorbent materials, like coal-based activated carbon, reactivation offers a sustainable and cost-effective way to regenerate their adsorption capacity.

rotary kiln reactivation: the most efficient method for reactivating exhausted activated carbon, aiming for minimal oxidation and optimal capacity restoration. The rotary kiln is operated at predetermined temperature, typically ranging from 600°C to 900°C (1112°F to 1652°F). This high temperature drives off the captured molecules from the activated carbon's pores. By implementing a low-oxygen rotary kiln reactivation process, DEC can effectively restore the adsorption capacity of exhausted activated carbon while minimizing environmental impact and maximizing the adsorbent lifespan.

Adsorbent Loading

New or sieved adsorbent, once completed the processes, will be reloaded in the adsorbers.

Conclusion

By implementing a comprehensive adsorbent service program encompassing monitoring, extraction, sieving, reactivation (if applicable), and replacement, you can ensure optimal performance, extend adsorbent life, and minimize waste generation. Remember, a well-maintained adsorption system not only optimizes overall SRU preformances but also contributes to a safer and more sustainable operation.

adsorbent • services