Taking styrene containing 1 mol%1-hexylthiol as model oil products,the reaction of 1-hexylthiol over solid bases(sodium hydroxide,sodium methoxide,sodium ethoxide,and potassium tert-butoxide)and solid Lewis acids(AlCl3,FeCl3,ZnCl2,and CuCl2)respectively is studied.Results demonstrate that sodium methoxide,sodium ethoxide as well as FeCl3 are able to efficiently catalyze the conversion of 1-hexylthiol at ambient temperature to bulk molecule sulfur-containing compounds with higher boiling point,such as dihexyl disulfide and hexyl(1-phenylethyl)sulfane,which can be readily removed from styrene by the subsequent distillation process.This study provides a facile method for reactive desulfurization of thiols in styrene.Solid bases only catalyze the oxidation of 1-hexylthiol,and their activities are determined by their basicity and structure.Sodium methoxide and sodium ethoxide,both with higher basicity and lower steric hindrance,exhibit the highest activity.FeCl3 catalyzes both the oxidation of 1-hexylthiol and the addition between 1-hexylthiol and styrene.CuCl2 also displays a high activity in catalyzing the oxidation of 1-hexylthiol,acting as a reactant or oxidizing agent,and oxidizes 1-hexylthiol to dihexyl disulfide and releases HCl.The reaction between HCl and styrene leads to the formation of 1-phenylethyl chloride.
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