V_2O_5催化氧化联二脲合成偶氮二甲酰胺  

OXIDATION OF BIUREA TO AZODICARBONAMIDE BY CATALYST V_2O_5

作　　者：聂宗武[1] 陈长章[1] 高冬寿[1] 李定[1] 柳美玉[1] 

机构地区：[1]中国科学院福建物质结构研究所,福州350002

出　　处：《Chinese Journal of Catalysis》1992年第1期24-30,共7页催化学报（英文）

摘　　要：研究了用V^(5+)作主催化剂,在低酸度下用氯酸钠使联二脲氧化成偶氮二甲酰胺反应中,催化剂钒、溶液的酸浓度以及反应温度等因素对反应的影响,生成偶氮二甲酰胺的速度对催化剂V^(5+)以及当反应溶液中〔H^+〕在0.29mol/L与0.66mol/L之间时对〔V^(5+)〕与〔H^+〕均呈二级反应。根据实验数据,提出了反应的可能机理,解释了实验结果,同时指出反应的较佳条件及实现催化剂循环使用的必要因素。The reaction mechanism of the oxidation of biurea to azodicarbon-amide (blowing agent AC) with sodium chlorate and catalyst V2O6 was studied. The effects of the concentration of catalyst V5+ , the acidity of the solution, and the reaction temperature and time on the reaction rate were also studied. The rate of conversion of biurea to azodicarbonamide is proportional to [V5+], and the rate constant is k = 0.034 L·mol-1·s-1. The loss of the acidity of the solution does not depend on the concentration of V5 + , but on the concentration of biurea. The reaction rate increases with increasing the acid concentration and the rate can be considered as a second order reaction in the range of [H+] = 0.29mol/L and 0.66mol/L. It is obvious that the reaction rate increases as the temperature increases, the optimum reaction temperature is 70℃. A certain amount of replenishment of sulfuric acid and V2O5 is necessary for repeated catalytic oxidation.

关 键 词：AC发泡剂 合成 联二脲 钒催化剂 

分 类 号：TQ314.259[化学工程—高聚物工业]