BTX: PROBLEM AND SOLUTION-Conclusion: CBUs eliminate BTX-induced catalyst deactivation

The first part of this two-part series (OGJ, Oct. 22, 2007, p. 60) describes how Saudi Aramco faced chronic Claus catalyst deactivation for years as a result of benzene, toluene, and xylene (BTX) in lean acid gas feed to several of its sulfur-recovery units (SRUs). Construction of seven BTX removal units using regenerable activated carbon beds was completed in December 2005; commissioning took place in spring 2006.This concluding article will discuss design issues, operating experience for the units, and their performance and effect on the downstream Claus catalyst. Fig. 1 shows one of the carbon-bed units. This is one of the seven carbon-bed BTX-removal units (Fig. 1).Click here to enla...

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