Arsenic Management

Arsenic is by far the most severe poison for Catalysts. Arsenic, can be present naturally in some crudes. If present, it is mainly found in the heavier fractions and in the lighter fractions of the cuts issued from heavy oil conversion units. To some extent, Arsenic can also be found in LPG and Gas Condensates.


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Catalyst cycle length is often limited by arsenic and silicon poisoning. Arsenic maximum allowable content on hydroprocessing catalysts during operation, depending upon the service, is in the range of hundreds of wppm. The maximum allowable level of Arsenic on catalyst after regeneration is 1,000 wppm.

The key features for arsenic trap are:

  • Dedicated support, for maximum Arsenic retention
  • Dedicated active phase, for maximum Arsenic removal activity (hydrogenolysis) while maintaining high HDS & HDN activity.
  • High density, for maximum Volumetric retention

Axens’ ArsenicTrap™ have been developed to meet these key properties. 

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