The industrialization of electrochemical synthesis of 3,6-dichloropicolinic acid(3,6-DCP) from 3,4,5,6-tetrachloropicolinic acid(3,4,5,6-TCP) in a tank-type undivided electrolytic cell with silver cathode was investig...The industrialization of electrochemical synthesis of 3,6-dichloropicolinic acid(3,6-DCP) from 3,4,5,6-tetrachloropicolinic acid(3,4,5,6-TCP) in a tank-type undivided electrolytic cell with silver cathode was investigated.The experimental results showed that the electrolytic performance greatly depended on the operation parameters,such as flow rate of electrolyte,temperature,and concentration of NaOH.The reduction of 3,4,5,6-TCP to 3,6-DCP was favored by increasing temperature and flow rate of electrolyte.Industrialization tests of electrochemical synthesis of 3,6-DCP were conducted under the following conditions: silver cathode,temperature 313 K,flow rate 6 cm·s-1,concentration of NaOH 8%(mass),concentration of 3,4,5,6-TCP 5%(mass),cathode current density 600 A·m-2.The current efficiency and conversion ratio of 3,4,5,6-TCP were more than 76% and 99%,respectively.The yield of 3,6-DCP was up to 90% and DC power consumption was 2.939 kW·h·(kg 3,6-DCP)-1.The purity of the product was higher than 95%,and its melting point was 151—153℃.展开更多
以MnSO_4,(NH_4)_2S_2O_8为反应物,Ag^+作为催化剂的溶液相方法合成了线团状的α-MnO_2。采用XRD、SEM和TEM等手段对合成产物进行了表征。发现反应温度和反应时间对产物的结晶度和形貌有很大的影响。通过恒电流充电/放电测试和循环伏安...以MnSO_4,(NH_4)_2S_2O_8为反应物,Ag^+作为催化剂的溶液相方法合成了线团状的α-MnO_2。采用XRD、SEM和TEM等手段对合成产物进行了表征。发现反应温度和反应时间对产物的结晶度和形貌有很大的影响。通过恒电流充电/放电测试和循环伏安法(CV)对最终产物的电化学性能进行了表征。结果表明,由于其独特的形态,25℃下反应2d的产物作为锂离子电池正极材料,表现出良好的循环稳定性(100次循环后放电比容量为124 m Ah·g^(-1))。线团状α-MnO_2在锂离子电池应用中可能是一个潜在的正极材料。展开更多
文摘The industrialization of electrochemical synthesis of 3,6-dichloropicolinic acid(3,6-DCP) from 3,4,5,6-tetrachloropicolinic acid(3,4,5,6-TCP) in a tank-type undivided electrolytic cell with silver cathode was investigated.The experimental results showed that the electrolytic performance greatly depended on the operation parameters,such as flow rate of electrolyte,temperature,and concentration of NaOH.The reduction of 3,4,5,6-TCP to 3,6-DCP was favored by increasing temperature and flow rate of electrolyte.Industrialization tests of electrochemical synthesis of 3,6-DCP were conducted under the following conditions: silver cathode,temperature 313 K,flow rate 6 cm·s-1,concentration of NaOH 8%(mass),concentration of 3,4,5,6-TCP 5%(mass),cathode current density 600 A·m-2.The current efficiency and conversion ratio of 3,4,5,6-TCP were more than 76% and 99%,respectively.The yield of 3,6-DCP was up to 90% and DC power consumption was 2.939 kW·h·(kg 3,6-DCP)-1.The purity of the product was higher than 95%,and its melting point was 151—153℃.
文摘以MnSO_4,(NH_4)_2S_2O_8为反应物,Ag^+作为催化剂的溶液相方法合成了线团状的α-MnO_2。采用XRD、SEM和TEM等手段对合成产物进行了表征。发现反应温度和反应时间对产物的结晶度和形貌有很大的影响。通过恒电流充电/放电测试和循环伏安法(CV)对最终产物的电化学性能进行了表征。结果表明,由于其独特的形态,25℃下反应2d的产物作为锂离子电池正极材料,表现出良好的循环稳定性(100次循环后放电比容量为124 m Ah·g^(-1))。线团状α-MnO_2在锂离子电池应用中可能是一个潜在的正极材料。
