ionic liquids, [C6ImBS][HSO4] exhibited the best catalytic performance, which was ascribed to its strong Brønsted acidity and low viscosity. The catalytic activity of the ionic liquid was near that of concentrated sulfuric acid. The influences of ionic liquid dosage, reaction temperature and molar ratio of methanol to formaldehyde were explored using [C6ImBS]HSO4 as the catalyst. Under the optimal conditions
在具有不同碳原子链长的烷基的各种布朗斯台德酸
离子液体中,研究了
甲醇与甲醛的催化反应,以制备
甲缩醛。对
离子液体的结构,酸度和性质进行了实验表征和理论分析。研究了
离子液体的布朗斯台德酸度-粘度-活性关系。在所有这些
离子液体中,[C 6 ImBS] [HSO 4 ]表现出最佳的催化性能,这归因于其强大的布朗斯台德酸度和低粘度。
离子液体的催化活性接近浓
硫酸。使用[C 6ImBS] HSO 4作催化剂。在n(
甲醇): n(
甲醛): n(ILs)= 2.5:1:0.0258的最佳条件下,60°C和4 h,
甲醛的转化率可以达到63.37%。
离子液体[C 6 ImBS] HSO 4可重复使用。