Liquid Phase Reaction System for Hydrochlorination of Acetylene in Ionic Liquids
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
Abstract：Looking for suitable media is a critical factor that imposes great restriction on the evolution of gas-liquid acetylene hydrochlorination reaction. Ionic liquids (ILs) as green media due to negligible vapor pressure and good thermal stability have provided new approach for this kind of reaction. In this study, catalytic systems consisting of non-mercuric catalysts and 1-butyl-3-methylimidazolium chloride ionic liquids (([Bmim]Cl) for acetylene hydrochlorination were explored. The effects of temperature, flow rate and metal catalyst species on the catalytic activity in [Bmim]Cl system were studied and further the influence of the structure of ILs on the performance of PdCl2/IL systems was investigated. On the above basis, a series of low-cost and efficient PdCl2/protonic IL systems were developed and was firstly applied in acetylene hydrochlorination reaction. Result showed that acetylene conversion of about 75% and vinyl chloride selectivity of above 99.3% can be obtained in the PdCl2/protonic IL systems under the reaction temperature of 180 ℃, acetylene flow rate of 5 mL/min when the flow rate ratio of HCl to C2H2 was at 1.2 and PdCl2 molar concentration was 0.04 mol/L. Good reaction stability was observed over 6 h. This green non-mercuric catalytic system for hydrochlorination of acetylene looks promising for further study.
Hu Jingyi,Yang Qiwei,Cheng Dangguo et al. Liquid Phase Reaction System for Hydrochlorination of Acetylene in Ionic Liquids[J]. 化学反应工程与工艺, 2016, 32(3): 231-236.
