Refiners gave heavy attention to hydroprocessing operations at the most recent National Petroleum Refiners Association annual question and answer session oil refining and petrochemical technology. Among the topics covered were diesel color, blending to meet diesel sulfur specs, and ammonia injection in hydrocracking units. The panelists (see box) also related their experiences with increasing vacuum gas oil conversion in hydrocracking operations. The 1992 NPRA Q&A Session was held Oct. 14-16, in Anaheim, Calif. For details on this meeting's format, see OGJ, Feb. 22, p. 45. DIESEL COLOR In view of more st...

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