Arsine Removal Adsorbents Trapping material for arsine, phosphine and sulfur from gas & liquid streams

The poisonous effects of arsine and other metal hydrides on hydrogenation and polymerization catalysts is well documented. By far the most common, arsine can seriously deactivate the high-activity Ziegler Natta, metallocene and noble metal catalysts used for processing cracked light ends. Arsine/phosphine guard bed is typically located before acetylene converter catalyst processing ethylene and before the MAPD (MethylAcetylene and PropaDiene) converter on propylene stream.

Sulfur compounds such as H2S and COS are frequently responsible for the catalyst poisoning problem, and their removal is also required to maintain the efficiency of downstream processing.


Axens’ Experience and Offer

Axens’ experience in arsine removal extend back to the 1970’s with an offer associated with a full range of services including:

  • Total arsine analysis in gas or liquid phase
  • On site pilot-testing in gas or liquid phase with Axens' Sorbotest™ device
  • Identification of alternatives and recommendations for spent sorbent disposal.

The unique properties of lead oxide make AxTrap™ 191 the only high-capacity options on very reactive feeds when copper or nickel-based adsorbents cannot be used. Axens know-how comes mainly from the preparation of the alumina support. The intrinsic properties of alumina are key to enhance mass transfer diffusion and take full advantage of the active phase.

AxTrap™ 192 and 194 work the same way as AxTrap™ 191 but this time the active metal oxide is Copper oxide. Copper oxide has more capacity than lead oxide but to the cost of a higher reactivity towards the feed. Axens will guide you through the right selection of arsine guard to be used to ensure smooth operation and on-spec product.

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