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AM-96-26 FCC UNIT SHORT CONTACT TIME OBSERVATIONS

William Kelly, Larry Hunt, Xmp Zhao, GRACE Davison

Format:
Electronic (digital download/no shipping)

Associate Member, International Member, Petrochemical Member, Refining Member - $0.00
Government, NonMember - $35.00

Description:

Short contact time riser termination devices have become standard design in FCC unit reactor sections. These systems minimize post-riser oil and catalyst contacting that reduces nonselective cracking. Conversion is lost with the addition of short contact time termination devices due to the reduced post-riser cracking. Refiners may need to change their standard operating mode to optimize conversion with the new unit configuration. A review of industry equilibrium catalyst trends shows that refiners are increasing catalyst activity for SCT operations via higher rare earth and small increases in zeolite and matrix surface area. The industry has followed a balanced zeolite to matrix approach to allow for commercial unit factors such as equilibrium catalyst metals levels, catalyst stripping requirements, and changing feed types. Laboratory testing showed that increasing catalyst activity is an effective means to increase conversion in the SCT operation, particularly in units limited by catalyst circulation rates. The specific method of increasing catalyst activity (by either zeolite activity or matrix activity) depends on a particular operating scenerio. Overall, no single catalyst property best fit all short contact time evaluations. Favorable catalyst properties include high activity, coke selective matrix activity, high activity per unit of surface area, and good hydrothermal stability especially in a high metals environment. The SCT catalyst is chosen as part of an overall operating program to maximize profitability in the FCC unit.

Product Details:

Product ID: AM-96-26
Publication Year: 1996