DESIGN, INSTALLATION PITFALLS APPEAR IN VAC TOWER RETROFIT

Norman P. Lieberman, Elizabeth T. Lieberman Process Improvement Engineering Metairie, La. Retrofitting a vacuum tower with structured packing can improve gas oil quality and increase both resid throughput and gas oil recovery. However, many vacuum tower retrofits achieve less than predicted improvements. Observations made during a vacuum tower turnaround illustrate some of the problems that can be encountered. A simplified sketch of the revamped vacuum tower is illustrated in Fig. 1. One of

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