Molecular sieves used for dehydration of natural gas and associated petroleum gas operate as adsorbents and are routinely regenerated in-cycle within the dehydration unit. However, during long-term operation, coke deposits and sulfur-containing compounds accumulate on the surface and inside the pore structure of the sieve. These species cannot be removed by standard in-cycle regeneration. As a result, the dynamic adsorption capacity decreases, leading to planned replacement of the adsorbent bed. After unloading, such molecular sieves are typically sent for disposal.
MOLECULAR
SIEVE
REACTIVATION