多功能Na2WO4-离子液体催化体系催化环己醇一锅合成
己内酰胺
王荷芳;贾丽媛;胡荣斌;高美丹;王延吉
【期刊名称】《催化学报》 【年(卷),期】2017(038)001
【摘要】Na2WO4-acidic ionic liquid was used as a simple, ecofriendly, recyclable and efficient catalytic sys-tem for the one-pot conversion of cyclohexanol to ε-caprolactam. The effect of the structure of the ionic liquid on the catalytic activity of this system was investigated, and the results revealed that sulfonic acid-functionalized ionic liquids with HSO4- as an anion gave the best results. The highly efficient performance of this catalyst system was attributed to the phase-transfer behavior of the cation of the ionic liquid, the improved coordination of the substrate to bisperoxotungstate during the oxidation reaction, and the stabilization of the intermediate formed during the Beckmann rear-rangement.%己内酰胺是合成尼龙-6和工程塑料的关键中间体.工业上己内酰胺的合成工艺分三步:以环己醇为原料合成环己酮,环己酮氨肟化合成环己酮肟,环己酮肟重排生成己内酰胺.该工艺存在工艺流程长、重排过程中使用发烟硫酸腐蚀设备、形成大量低值副产物硫酸铵等问题.随着人们对环境保护意识的提高,发展环境友好、经济效益高的直接合成己内酰胺工艺已经迫在眉睫.多步串联反应具有设备投资少、中间分离步骤少、反应效率高等优点,其关键问题之一是多功能催化剂的开发.环己醇作为环己烷氧化反应的副产物,能够直接用于己内酰胺
多功能Na2WO4-离子液体催化体系催化环己醇一锅合成己内酰胺
