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29.1 Introduction
With the increasing tendency for petroleum reners
to process heavier and more sour crudes in order to
take advantage of the discount that heavy sour crudes
have to light sweet crude, and with the stringent reg-
ulatory environmental mandates around the world
to reduce sulfur levels in transportation and heat-
ing fuels, reners will have to expand their ability to
handle the increased levels of fuel desulfurization. The
most common method for removing sulfur from fuels
is hydrotreating and hydrocracking (grouped together
herein as hydroprocessing). Hydroprocessing involves
treating the sulfur-containing hydrocarbon with hy ...