偶氮二甲酰胺的电化学合成工艺研究

Process research on the electrosynthesis of azodicarbonamide

摘要:

采用热分解法制备的SnO2 Sb2O3/Ti电极作为阳极材料，以联二脲为原料，电化学氧化法合成出偶氮二甲酰胺。通过正交试验和单因素实验研究了电流密度、电量、NaBr、H2SO4的量以及温度对偶氮二甲酰胺的产率和电流效率的影响。得出最佳工艺条件：电流密度0.23 A?cm-2、电量0.128 F、NaBr 8 g?L-1、H2SO4 147g?L-1、温度40 ℃，偶氮二甲酰胺的产率达到94%，电流效率89%。此外，SnO2 Sb2O3/Ti电极的循环伏安测试结果表明，吸附溴原子Brad复合成溴的步骤控制电合成偶氮二甲酰胺的反应速度，阳极过程符合EC机理。

Abstract:

Azodicarbonamide was obtained by electrochemical oxidation of biruea utilizing SnO2 Sb2O3/Ti electrode as anode that was prepared by thermal decomposition method. The amount of current density、power、NaBr、H2SO4 and temperature on azodicarbonamide yield and current efficiency were studied by orthogonal experiment and mono-factor tests. The optimum conditions are: current density 0.23 A?cm-2、power 0.128 F、NaBr 8 g?L-1、H2SO4 147g?L-1、temperature 40 ℃, the yield of azodicarbonamide reached 94%，current efficiency was 89%. The cyclic voltammetry curves of SnO2 Sb2O3/Ti anode shows that the speed of electrochemical synthesis azodicarbonamide was controlled by the procedure of Brad combined to bromine, the anodic process conform to the EC mechanism.