OPARIS™
Xylene Isomerization Catalyst -
Ethylbenzene reforming type
OPARIS™ is a new
generation catalyst with a greatly improved para-xylene yield over other
commercial catalysts. OPARIS™ is based on a proprietary zeolite
and platinum as the active materials. The catalyst combines a high activity
for conversion of ethyl benzene into xylenes with very low by-product
make and superior activity and stability. OPARIS™ was developed in
the laboratories of IFP and is manufactured and marketed by Zeolyst International
and provided with grassroots licenses in conjunction with Axens.
Oparis™ is the current market performance leader with unparallel overall plant efficiency of feed to paraxylene, exceptionally low C9 aromatics losses and improved stability
ApplicationsOPARIS™ is used in aromatics complexes when conversion of ethyl benzene to xylenes is required in combination with isomerization of xylenes into the equilibrium composition. Appropriate process conditions can achieve ethyl benzene conversion levels up to 40% whilst the approach-to-equilibrium for para-xylene is almost at the thermodynamic limit of 99%. Due to its very high activity and selectivity, OPARISä can be used for catalyst replacement when debottlenecking and/or minimum benzene production is desirable.
View larger image.
FeedsTypical feeds processed over OPARIS™ are C8 -aromatics streams depleted from paraxylene, and sometimes also from orthoxylene; usually effluent from a crystallizer or from an absorption paraxylene recovery unit. When OPARIS™ catalyst is applied, high concentrations of ethyl benzene in the fresh feed to the complex can be used because the high conversion limits build-up of ethyl benzene in the recycle. This gives the user the ability to blend in large amounts of C8 aromatics extracted from pygas streams that are high in ethyl benzene.
OPARIS™Advantages
achievable with low C8 aromatic
losses
and high EB conversion
Activity OPARIS™ activity is higher than that of other commercially available catalysts. Activity decline is extremely low and long cycle lengths are expected, but of course cycle length depends also on feedstock, operating severity and unit constraints
RegenerationDuring
operation catalyst activity slowly declines mainly because of coke lay-down.
The activity can be restored to a large extend by carbon burn-off. Regeneration
can be performed in-situ and ex-situ.
Other Services
Axens can provide on request feasibility studies, revamps, grass-roots designs and process technical assistance. Also available are the proprietary Axens CATAPAC® catalyst dense loading technology, and the Axens TEXICAP® catalyst cover for radial flow reactors
Commercial ExperiencesOparis has been commercialized since early 2001. To date, we have applied Oparis at more than a dozen commercial unit applications. It has been proven in numerous applications to be a stable catalyst with good regenerability.
Supply and Technical
Support 
Zeolyst International will be pleased to provide OPARIS™
performance estimates for catalyst replacement. 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 reviews
will be held at the site. A telephone help-desk is available.
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