【摘要】 以噻吩的正庚烷溶液模拟轻质油品,研究了H2O2—HCOOH氧化条件下,相转移催化氧化噻吩脱硫。实验结果表明,四丁基溴化铵用量0.10 g,反应1.5 h,反应温度45℃,脱硫率最高可达86.36%。动力学研究表明,以四丁基溴化铵作为相转移催化剂,过氧化氢-甲酸氧化噻吩脱硫为表观一级反应,反应速率常数K30℃=0.615 2h-1、K40℃=1.267 2h-1、K50℃=0.858 1h-1;相转移催化在H2O2—有机酸体系氧化噻吩脱硫反应中的作用为相转移催化剂阳离子Q+对氧化剂活性组分HCOOO-的转移作用。并建立了相转移催化氧化噻吩脱硫反应的循环模型。更多还原

【Abstract】 Oxidative desulfurization of thiophene by phase transfer catalysis has been investigated with hydrogen peroxide-formic acid as the oxidant,thiophene in n-heptane as model compound of light oil.It was shown that the desulfurization rate of thiophene was 86.36%,under the conditions of water/oil ratio being 1∶1,after1.5 h at temperature of 45 ℃ by TBAB.From the kinetics investigation,it was shown that when the model compound was oxidized by hydrogen peroxide-formic acid with TBAB as phase transfer catalyst,the reaction was pseudo first-order reaction with rate constants of K30 ℃=0.615 2 h-1,K40 ℃=1.267 2 h-1,and K50 ℃=0.858 1 h-1.The essential process of catalytic oxidation is the transfer of oxidizing active ingredients RCOOO-from water phase to oil phase by Q+,and the cycling models of oxidative desulfurization of thiophene by phase transfer catalysis(Q+X-) is builted.更多还原