BTX: PROBLEM AND SOLUTION-1: Activated carbon eliminates Claus deactivation problem

As have other operators with lean feed acid gas containing benzene, toluene, and xylene (BTX), Saudi Aramco has dealt for years with chronic Claus catalyst deactivation, low sulfur recovery, and frequent shutdowns to replace catalyst.After a process selection study identified the most cost effective solution to the problem, the company installed regenerable activated-carbon beds upstream of the sulfur-recovery units (SRUs) to remove aromatic contaminants before they reach the converter beds. Saudi Aramco completed construction of seven BTX-removal units to treat acid feeding downstream sulfur plants in December 2005. Commissioning took place in spring 2006.Part I of this two-part series d...

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