The Study of Electrohydrodimerzation in Adiponitrile

• Main Authors: Yen, Tzu-Chien, 顏子謙
• Other Authors: Yen, Shi-Chern
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/83816096530265738777

碩士 === 國立臺灣大學 === 化學工程學系研究所 === 86 === In this thesis, we stugdy on the electrochemical synthesis of adiponitrile (ADN). Experimentally, we use a batch reaction system to proceed the electrohydrodimerization (EHD) of acrylonitrile (AN). The electrolysis cell is a single cell composed of plate electrodes using SS316 as the anode and lead as the cathode. To evaluate the processibility of this set of electrode materials and study the possible variable affecting the EHD process, one proceed the reaction by differing the variables such as the current density, initial concentration of AN, concentration of tetra-n-butylammonium hydroxide and reaction temperature. The experiment shows that under appropriate condition, current density is less than 2 kA/m2 and AN initiall concentration larger than 3wt%, the selectivity of ADN is up to 60%, While the current efficiency reaches 90%. As the current density is lower down to 1 kA/m2, the selectivity of ADN reaches 90%, and the current efficiency exceeds 95%. We also find that adding small amount of tetra-n-butylammonium hydroxide is helpful in increasing the selectivity of ADN. The limit concentration is about 0.02wt%, more amount is helpless to the EHD reaction. And the temperature only effects the cell voltage, No significant effect to the EHD reaction is observed. At the viewpoint of commercializing, current density reflects the reaction rate and current density above a fixed level is necessary. As a result, in the situation of higher current density, how to maintain the current efficiency, the selectivity of ADN, and the stability of cathode surface are important research topics in future.