Disclosed is a process for producing ethylene glycol catalyzed by an ionic liquid, characterized in that the process includes the following three steps: (a) a carbonylation step of ethylene oxide and CO
2
catalyzed by an ionic liquid composite catalyst comprising a hydroxyl functionalized ionic liquid and an alkali metal salt under an aqueous condition to produce ethylene carbonate and ethylene glycol; (b) a hydrolysis step of reacting the reaction solution containing ethylene carbonate and the ionic liquid composite catalyst obtained in step (a) with water to produce ethylene glycol; (c) a purification step of dehydrating and refining ethylene glycol from the aqueous solution containing ethylene glycol and the catalyst produced in step (b). The present process has the following advantages: the catalyst has high activity, high suitability, and good stability, the reaction condition is wild, the conversion of ethylene oxide is high, the selectivity of ethylene glycol is high, and the process is simple.
揭示了一种由
离子液体催化生产
乙二醇的过程,其特征在于该过程包括以下三个步骤:(a) 由含有羟基官能化
离子液体和碱
金属盐的
离子液体复合催化剂在
水相条件下催化
乙烯氧化物和
CO2的羰基化步骤,以产生
碳酸乙烯酯和
乙二醇;(b) 将步骤(a)中获得的含有
碳酸乙烯和
离子液体复合催化剂的反应溶液与
水反应以产生
乙二醇的
水解步骤;(c) 从含有
乙二醇和步骤(b)中产生的催化剂的
水溶液中脱
水和精制
乙二醇的纯化步骤。该过程具有以下优点:催化剂活性高、适用性强、稳定性好,反应条件宽松,
乙烯氧化物转化率高,
乙二醇选择性高,过程简单。