Zeolyst Z-700A is a Pentane/Hexane isomerization catalyst based on the technology of the originators of the HYSOM catalyst. Applying sophisticated catalyst manufacturing technology, Z-700A is specifically designed for isomerization of pentane and hexane to high octane number branch chain hydrocarbons and combines an additional functionality for the saturation of benzene.

Applications:
Z-700A is recommended for use in refineries and petrochemical complexes when the isomerization of pentane and hexane is required to produce a high-octane gasoline blending component. Performance tests of Z-700A have demonstrated its resilience to sulphur poisoning and a successful recovery from such incidents. The Z-700A can be used in all reactor types utilised for this process: classical fixed bed reactors, radial flow reactors, etc.

Feeds
Typical feeds processed over Z-700A are hydrotreated light straight run streams or normal paraffins from a recovery unit. The Z-700A catalyst is has excellent resistance to poisoning by sulfur excursions from feed contaminates. Customers like the robustness and forgiving nature of the Z-700A catalyst, because the main factors in catalyst deactivation are impurities and heavy components in the feed. Average catalyst life is typically ten years. The Zeolyst Z-700A also shows no adverse performance effects when utilising make-up hydrogen containing ppm levels of CO/CO2

Selectivity / Yields
Zeolyst Z-700A selectivity is higher than that of other commercially available pentane/hexane isomerization zeolite based catalysts. The Zeolyst Z-700A catalyst will produce a higher octane-barrel yield versus competitor catalysts. The activity decline is slow and long cycle lengths are expected, but of course cycle length depends also on feedstock, operating severity and unit constraints

Regeneration
During operation catalyst activity slowly declines mainly because of coke lay-down. The activity can be restored to a large extent by carbon burn-off. This can be done in-situ; however, ex-situ is preferred because of the better temperature control.

Supply and Technical Support  
CRI is the world wide sales agent for Zeolyst catalysts and will be pleased to provide performance estimates for Z-700A catalyst prepared by Zeolyst International. Zeolyst provides start-up assistance and operational advice. Immediately after start-up the operation conditions will be fine-tuned together with the operational staff. The catalyst performance will be monitored and during normal operation six months reviews will be held at the site, and following review operational advice will be given.

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