April 2015

Refining Developments

Update on the catalytic cracking process—Part 2

One of the prime challenges in the operation of a fluid catalytic cracking unit (FCCU) is keeping the catalyst circulating. Compared to other challenges with FCC operations, correcting erratic catalys..

One of the prime challenges in the operation of a fluid catalytic cracking unit (FCCU) is keeping the catalyst circulating. Compared to other challenges with FCC operations, correcting erratic catalyst standpipe operation tops the list. In this article, fundamental equations and practical lessons learned reveal much of the industrial knowledge surrounding fluidized particle flow through standpipes. The topics covered include theoretical aeration requirements, troubleshooting, aeration mediums, catalysts and commercial lessons-learned. Theoretical aeration requirements Correlations have been published for estimating the theoretical rates of aeration gas to be added to a standpipe to offse

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