Single and combined effects of Bottom Cracking (BCA) and Propylene Booster (PBA) separate particles additives addition to a Fluid Catalytic Cracking (FCC) catalyst on the FCC product distribution and quality

CATEGORY: FCC – FLUID CATALYTIC CRACKING
Applied Catalysis A: General, Available online 30 June 2012, In Press, Corrected Proof
Single and combined effects of Bottom Cracking (BCA) and Propylene Booster (PBA) separate particles additives addition to a Fluid Catalytic Cracking (FCC) catalyst on the FCC product distribution and quality
Yannick Mathieua
Avelino Cormaa
Michaël Echardb
Marc Boriesb
a Instituto de Tecnología Química, UPV-CSIC, Universidad Politécnica de Valencia, Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022-Valencia, Spain
b TOTAL Raffinage Marketing, Research Centre of Gonfreville, Z.I. du port autonome du Havre, route industrielles, carrefour n° 4, 76700 Rogerville, France
Abstract
Describes how the single and combined addition of commercial separate particle additives, such as Bottom Cracking additive (BCA) and Propylene Booster additive (ZSM-5 based-PBA), to a FCC USY catalyst can influence product distribution and quality during FCC processing.
Due to the relatively low catalytic activity of the BCA additive, the increasing single addition of BCA implies a higher ratio of thermal to catalytic cracking.  This leads to higher dry-gases and coke selectivities and a lower gasoline pool quality. The Bottom Cracking ability of the BCA additive is feed dependent.  It begins to be representative for high addition levels of about 50–60 wt%, allowing the increase of the LCO pool selectivity and quality. The single and low addition level of ZSM-5 based additive allows for significant improvement of light alkenes selectivity at the expense of gasoline selectivity, which improves the quality of the FCC gasoline pool.  The use of both additives in combination appears to be a promising upgrading strategy.  Such an approach makes it is possible to keep a high catalytic activity, to fully take advantage of the beneficial effects of the ZSM-5 and BCA additives, and simultaneously to mitigate the increase of coke and dry gas selectivities.
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