Here are some additional things to consider…
Never enter a vessel that contains used molecular sieve.
During the unloading process the molecular sieve may have adsorbed chemical compounds. These adsorbed chemicals may be desorbed again when the molecular sieve is exposed to open air, especially if humidity is high or the air is very moist.
These desorbed chemical compounds can create hazards if the desorbed chemical compounds are toxic. The plant manager or operator has the responsibility to know what chemicals may have be desorbed in this manner and to know what precautions may be necessary to ensure everyone’s safety.