Synthesis of Propylene Oxide in a Paired Electrolytic System: Studies on the Mechanism and Operating Factors

在對電極系統中合成環氧丙烷－反應機構與操作因素之研究

林宗榮(Tzong-Rong Ling) ； 林瑞昌(Zwen-Chun Lin) ； 楊明長(Ming- Chang Yang) ； 周澤川(Tse-Chuan Chou)

《Journal of the Chinese Institute of Chemical Engineers》 32卷4期 (2001/07) Pp. 341-349

https://doi.org/10.6967/JCICE.200107.0341

摘要

本研究利用對電解方法在一個氣泡系統中將丙烯經過環氧丙烷，為了使陰陽兩極可同時產生環氧丙烷採用陰離子交換膜將電解槽分隔成為陰陽兩極，在陽電解室，使用硝酸銀水溶液當陽極電解液可以產生氧化還原媒子Ag+/AgO+進行間接環氧化反應，在陰極電解室，使用酸性溶液導入氧氣可產生過氧化氫進行間接的環氧化反應，研究中測試單位電量所產生環氧丙的烷影響因素包括：施加電流，氣體流速，電解液濃度，和反應溫度等，分別找出陰陽極最佳的操作條件，並且評估單位電量所產生的環氧丙氧總量及提出對電極的環氧化反應機構。

並列摘要

Epoxidation of propylene to propylene oxide (PO) by means of paired electrolysis was studied in a bubbling system. An electrolytic cell, divided by an anion exchange membrane, was designed for producing PO in both anode and cathode compartments simultaneously. In the anode compartment, AgNO3 in the anolyte was used to form redox mediator, Ag+/AgO+, for indirect epoxidation of propylene. In the cathode compartment, oxygen was introduced into an acidic aqueous catholyte to form H2O2, hydrogen peroxide, which further epoxided propylene. The examined factors, which affected the amount of PO production per unit faraday, were the applied current, gas flow rate electrolyte concentration and temperature. The optimum operating conditions of the anode and the cathode compartments were obtained. The overall amount of PO production per unit of energy consumption was evaluated, and a mechanism of paired electro-epoxidation of propylene is also proposed.

並列關鍵字

Mechanism ； Operating factors ； Paired electrolysis ； Propylene oxide