摘要
三聚氰酸水解是三聚氰胺废渣降解生成氨和二氧化碳的关键步骤。在一间歇水解反应器中系统地研究了溶液酸碱性、三聚氰酸初始浓度、反应温度、反应时间对三聚氰酸降解率的影响,由结果可知:硫酸对三聚氰酸的水解无明显催化作用,而氢氧化钠的催化作用明显,且溶液中氢氧化钠浓度越高,催化效果越明显。在实验范围内,较优的工艺条件为:反应体系氢氧化钠浓度为0.18 mol/L、温度170℃、反应时间50 min,此时三聚氰酸的降解率达到94.10%。氢氧化钠作用下的三聚氰酸水解动力学研究结果表明:反应对三聚氰酸浓度为1级,对OH-浓度为0.284级,反应的活化能为70.1 k J/mol,指前因子为1.98×107L0.284/(mol0.284·min)。
The hydrolysis of cyanuric acid was a key step in the degradation process of melamine waste residue to ammonia and carbon dioxide. The effects of acid or basic solution, the initial cyanuric acid concentration, reaction temperature and reaction time on the degradation rate of cyanuric acid were systematically investigated in a batch reactor. The results show that the sulfuric acid almost has no obvious catalysis effect on hydrolysis of cyanuric acid. However, NaOH brings an obvious catalysis effects, and the higher NaOH concentration in the reaction solution can lead to higher catalytic ability. In the experiment, the degradation rate of 94. 10% was achieved under the optimized reaction conditions： NaOH concentration was 0.18 mol/L, reaction temperature was 170 ℃ and reaction time was 50 min. The results of kinetic studies of cyanuric acid hydrolysis in the NaOH solution show that the reaction to cyanuric acid is first order, the reaction order to hydroxyl ions concentration is 0.284, the activation energy is 70.1 kJ/mol and the per-exponential factor is 1.98×10^7 L^0.284/（mol0.284·min）.
出处
《化学工程》
CAS
CSCD
北大核心
2016年第10期51-55,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(21276163
21576168)
四川省科技支撑计划项目(2014GZ0058)
