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Gasoline alkylation desulfurization over Amberlyst 35 resin: Influence of methanol and apparent reaction kinetics

Authors
Journal
Fuel
0016-2361
Publisher
Elsevier
Publication Date
Volume
90
Issue
2
Identifiers
DOI: 10.1016/j.fuel.2010.10.010
Keywords
  • Alkylation
  • Desulfurization
  • Amberlyst 35
  • Thiophenic Sulfurs
  • Kinetics
Disciplines
  • Ecology
  • Geography

Abstract

Abstract Gasoline desulfurization is receiving attention worldwide due to the increasing stringent regulations on sulfur content for environmental protection purpose. As conventional hydrotreating technology leads to significant octane number loss and processing costs, the gasoline alkylation desulfurization process, which consists of weighing down the sulfuric compounds by catalytic alkylation with olefins present in the feed and distillation followed by, is a rather attractive way. In this paper, firstly alkylation of thiophenic compounds was researched over macroporous sulfonic resin Amberlyst 35 in methanol presence to increase the selectivity of catalyst, then kinetics of thiophenic sulfurs alkylation in FCC gasoline was researched without and with methanol. Results found that appropriate methanol (⩽2 wt.% methanol in model gasoline and ⩽1 wt.% methanol in FCC gasoline) could inhibit olefins oligomerization significantly without influence on the conversions of thiophenic compounds. The alkylation of thiophenic sulfurs could be described as pseudo first order reaction regardless of the existence of methanol. The introduction of methanol decreases the reaction rate constant and increases the activation energy of alkylation reactions.

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