离子液体中异丁烷/2-丁烯烷基化反应机理研究

以复合离子液体Et_3NH]Cl-AlCl_3-CuCl为催化剂,在连续搅拌釜式反应器中进行了异丁烷与2-丁烯烷基化反应;利用氘代异丁烷同位素示踪法研究了催化反应机理。结果表明,在离子液体中异丁烷烷基化的反应诱导期较短;三甲基戊烷产物主要源于异丁烷的自烷基化、丁烷/丁烯的直接烷基化以及C_(12)~+中间体的裂化反应,而大部分二甲基己烷是仲丁基碳正离子与丁烯加成的产物。

Reaction mechanism of isoparaffin alkylation in the presence of ionic liquid

The alkylation of isobutane with butene catalyzed by Cl-AlCl₃-CuCl ionic liquid was carried out in a continuous stirred autoclave reactor;deuterated isobutane was used as an isotope tracer to investigate the reaction mechanism of alkylation. The results indicate that the induction period of alkylation catalyzed by Cl-AlCl₃-CuCl is less than 30min. Tri-methyl-pentanes are primarily produced from the self-alkylation of isobutane, the alkylation of isobutane with 2-butene and the cracking of C₁₂⁺ intermediates, whereas the undesired di-methyl-hexane is mainly formed from the addition reaction between sec-C₄⁺ and 2-butene.