Low-pressure desulfurizationWe have read your review article "Product sulfur specs will determine future refining configurations" (OGJ, Oct. 18, 2004, p. 48). Haldor Topsøe AS is a supplier of ultralow-sulfur diesel (ULSD) catalyst and technology, and we have some comments that we believe will be of interest to the readers of OGJ.Selection of whether to revamp a low-pressure hydrotreater or to build a new hydrotreater is influenced by many considerations, and our licensees have taken different approaches to their ULSD projects based on specific needs.Several of our licensees have found it more economically attractive to revamp their hydrotreaters even at a very low pressure (30 bar);...

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