Hazard and cause of the surge in molecular sieve of molecular sieve purification system in an air separation unit are analyzed. The corresponding treatments and precautions are also proposed.

Molecular Sieve - is a manufactured crystalline version of Zeolite and is a non-hazardous.

Purification processes using dry media, such as activated charcoal (carbon) or molecular sieve, may be subject to rapid exotherms from sudden exposure of the media to large quantities of NF3.