This paper will update the latest activities of the Task Group with focus on the proceedings of a meeting held in September 2012 which included 28 participants. The meeting included presentations by Eastman Chemicals, Shell Chemicals, ExxonMobil Chemicals and BASF Port Arthur. Key findings from these presentations will be discussed. These papers highlighted issues regarding NOx accumulation in plants where the traditional feedstocks are not expected to contain NOx precursors, unexpected sources of NOx precursors and accumulation of NOx compounds in sections of the cold box previously thought to be too warm for NOx compound formation. The meeting concluded with a discussion on the future path for the Task Group. The main follow-up objective set forth from this meeting was to update the 2007 Tutorial on NOx Safety in Ethylene Plant Cold Boxes with the latest findings and understandings of NOx accumulation in cold boxes.
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