FCC was traditionally designed to convert heavy gas oil range feedstocks to high octane gasoline. Brazilian refineries have relied on FCC as the chief conversion process. However, peculiarities of the local petroleum industry have forced refiners to change the FCC process, first to adapt to increasingly heavier feedstocks derived from national crude oils, and subsequently to change the product slate to comply with market demand, requiring less motor gasoline, more diesel oil and light olefins for petrochemicals. This paper will focus on the second set of process adaptations, including operating variables and choice of refinery processes schemes for low aromatics FCC products within crude oil choice constraints.
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